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chemical character     
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  化学性质
     By comparing the mechanism of O 3/H 2O 2 process and considering the chemical character of nitrobenzene and variation of residual aqueous ozone, it is speculated that the degradation of nitrobenzene by O 3/Mn might follow a radical pathway.
     从已知的O3 /H2 O2 工艺反应机理 ,并根据硝基苯的化学性质和水中剩余臭氧动态监测结果推断 ,O3 /Mn降解硝基苯可能同样遵循自由基反应机理 .
短句来源
     Study on predicting the chemical character of gallstones by CT and ultrasonography in vitro
     CT和超声对胆石化学性质预测的体外研究
短句来源
     The percentage of browning was 8% when cultured 14d, the best suitable concentration of three reagents combination was ascorbic acid 2.5 g·L~-1, sodium sulfite 2.5 g·L~-1, citric acid 5 g·L~-1. The anti-browning effect of each reagent on callus was related to its chemical character.
     (2)在培养期间3种试剂配合使用对愈伤组织褐化抑制有明显的交互作用,培养14d时,褐化率降到8%,抗坏血酸、亚硫酸钠、柠檬酸三者配合使用最佳浓度分别为0.25、0.25和5g·L-1。 各种试剂对东方杉愈伤组织褐化抑制效应与其化学性质有关。
短句来源
     Results The chemical character of the gallstones were well correlated with their CT and ultrasonographic patterns.
     结果 胆石的CT和超声分类同其化学性质密切相关。
短句来源
     Neural Network Analysis of Material Chemical Character Effects on Biofouling Mass and Induction Period
     材料化学性质影响微生物污垢的神经网络分析
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更多       
  化学特征
     The samples of PM2.5 and PM10 were collected using the air sampler of TEOM 1400 and 2100 types during the period of December 2001~January 2002 at 19 representative sampling sites of Shanghai urban and suburb area to investigate the chemical character of aerosol particulate matter in winter.
     为了研究上海冬季大气气溶胶颗粒物的化学特征,2001年12月~2002年1月使用TEOM1400型和2100型空气采样器,采集了市区和郊区19个有代表性采样点的PM2.5和PM10样品.
短句来源
     CHEMICAL CHARACTER OF A ORGANOZIRCONIUM(Ⅳ) REAGENT AND ITS REACTION WITH GLUCOSIDE COMPAUND
     有机锆(Ⅳ)试剂的化学特征及其与糖苷类的反应
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     Chemical Character,Origin and Use of Geothermal Water in eastern Xingtai
     邢东地热水的化学特征、起源及利用
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     On the basis of analyzing the chemical character of underground hot water, the formation mechanism of the chemical composition and its genesis are discussed in this paper.
     该文在分析地下热水化学特征的基础上,对地下热水化学成分形成机理及地下热水成因进行探讨。
短句来源
     Chemical character of sediments
     沉积物的一般化学特征
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更多       
  化学性状
     Effect of Simulated Continuously Rainwater Leaching on Soil Chemical Character
     模拟雨水连续淋洗下土壤化学性状动态变化特征的研究
短句来源
     that change during soil reconstruction in physical character, chemical character,bilogical character and erosion.
     土壤重构过程中的土地利用/覆被变化主要体现在土壤物理性状、化学性状、生物性状及侵蚀性状发生变化;
短句来源
  化学特性
     COMPARATIVE STUDY ON CHEMICAL CHARACTER AND FATTY ACID COMPOSITION OF FAT IN MASKED CIVET AND IN NUTRIAS
     果子狸与狸獭体脂化学特性及脂肪酸组成的比较研究
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     Objective To investigate the distribution and chemical character of nestin immunoreactive cells in the human basal forebrain.
     目的 探讨巢蛋白 (nestin)免疫阳性细胞在人基底前脑内的分布规律及化学特性
短句来源
     To ensure that the export paper box accords with the request of safety, sanitation and environment, this study of the inspection method for forbidden polyvinyl alcohol water glass was developed through the different physical and chemical character of polyvinyl alcohol water glass and starch adhesives aiming to construct a series of technology administration specifications.
     本文利用泡花碱和淀粉粘合剂的不同物理-化学特性,对禁用粘合剂泡花碱进行检验方法的研究,目的在于建立一套技术管理规范,以保证出口包装纸箱符合安全、卫生和环保的要求。
短句来源

 

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      chemical character
    Based on the chemical findings we postulate that chemical character displacement occurred inC.
          
    Quenching the fluorescence (FL) of terbium perchlorate by 2,2'-adamantane-2,2'-dioxide (1) was shown to have a chemical character and was caused by the formation of the [1...Tb3+] complex.
          
    The wetting of lanthanum hexaboride by copper is accompanied by the establishment of a bond between them which has a chemical character.
          
    The crystal structure and chemical character of lower oxides of titanium TiO0→0.48
          
    Moreover, we suggest that glycosylation may depend upon the chemical character of the aglycone and is an important factor in the performance of first instars.
          
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    Ⅰ. General SKETCH The Cenozoic basalt lavas are widely distributed along the coastal regionand its adjacent districts in eastern China. They form either widespread plateausor scattered mesa-like hills; and, in some places, the volcanic craters are stilladmirably preserved to-day. These basalt sheets were erupted extensively in lateTertiary and early Quaternary times. They belong to the multiple-vent basalts,but not the plateau basalt in the type of eruption. In this paper are given the results of a petrochemical...

    Ⅰ. General SKETCH The Cenozoic basalt lavas are widely distributed along the coastal regionand its adjacent districts in eastern China. They form either widespread plateausor scattered mesa-like hills; and, in some places, the volcanic craters are stilladmirably preserved to-day. These basalt sheets were erupted extensively in lateTertiary and early Quaternary times. They belong to the multiple-vent basalts,but not the plateau basalt in the type of eruption. In this paper are given the results of a petrochemical study of the Ceno-zoic basalt in eastern China. Geological and petrographical studies of the basaltsare not described in detail. Judging from the chemical compositions, the mostoutstanding characteristic feature of the most basaltic rocks is the richness inalkalis, especially in K_2O, also the undersaturation in silica, and, therfore,the most of the basalts distinctly belong to the alkaline rock suite. Such chemicalcharacters are closely related to modal compositions. The general petrogra-phical characters of the basalt may be now as well described. In North Chinaand South Manchuria most basalts are trachy basalt and its allied types, andoccasional nepheline basalt. The constituent minerals of these basalt are cha-racterized by the presence of anorthoclase, potash-adesine, plagioclase, titanaugite,as well as by the abundance of olivine. In South China the main basalt is olivinebasalt, consisting of olivine, augite, and plagioclase as usual. At some placesthe basalt may be slightly silica saturated that the occasional presence of hyper-thene and quartz (xenocryst) is noteworthy. In North Manchuria the dominant basalt is leucite basalt, containing leucite and olivine as phenocryst and groundmass constituent. Xenocryst of quartz and feldspar grains are sometimes present.In Taiwan Province, basalt of Kuanyinshan volcano is of the tholeiite type,but, in some other districts, the alkaline basalt with feldspathoidal constituentalso occurs. In view of the above-mentioned facts, the petrographical difference seemsto be matched by the differences of the major tectonic forms of China. Thesefacts may be tabulated below: Geographical region Tectonic forms Basalt type 1. North Manchuria Granitized region in Varisclde Leucite basalt 2. North China & South Precambrian Sino-Korean Trachybasalt Manchuria massive 3. South China Huanan platform in Yenshanide Olivine basalt 4. Taiwan Himalayide Tholeiite basalt Ⅱ. Regional INVESTIGATION In Table 1 the chemical analyses of the Cenozoic volcanic rocks in easternChina published up to 1951 were collected, of which 74 analyses are basalticrocks. The available analyses of every basalt sheet are taken an average to re-present the regional composition of the basaltic rocks. The localities of the basaltsheets where the analyzed chemical data are referable are shown in Figure 1.In all, 21 localities of basalt are investigated. The average chemical compositionsof each basalt locality, together with the normative minerals, Niggli's valuesand Zavarickij's numbers are given in Tables 2 A and 2 B respectively (localnos. in Table 2 correspond to the numerous in circle in Figure 1). For theconvenience of comparison, the average chemical composition of some standardbasalts (after S. R. Nockolds, 1954), some alkaline basalt in New Zealand (afterW. N. Benson, 1944) and Uganda (after A. Holmes, 1937), and the world's ba-salts, together with the normative minerals, Niggli's values and Zavarickij'snumbers of our calculation, are selected and given in Tables 3A, 3B, 7A, 7Brespectively. As mentioned above, the chemical composition of eastern China basalt ischaracterized by the high content of alkalies, and especially the K_2O. This cha-racter is definitely revealed by the normative feldspar, which is given in Table2 A and graphically shown in Figure 2. From this graphical representation,it is recognized that the normative feldspar becomes increasingly enriched ormolecular from South China to North Manchuria. Although the projected points appear to be scattered, a trend of clustering of the normative feldspars in accor-dance with its geographical distribution is apparent upon close inspection. Inthe normative pyroxene diagram, Figure 3, it is shown that most basalts of easternChina are rich in Wo molecular, falling near the Di-Hd line; On the otherhand, those of Kuanyinshan basalts of Taiwan Province are poor in Wo andcluster in the central part of the Di-Hd-Fs-En field. Therefore, that the easternChina basalt, excluding that of Kuanyinshan, belong to the alkaline rock suiteis justified. The comparison diagrams of qz, al-alk, C-(al-alk) and K-mg ofNiggli's values, based on the data given in Tables 2 B, 3 B, and 7 B, are gra-phically shown in Figs. 4, 5, 6 and 7 respectively. As will be seen from thesefigures, in general, the qz and al-alk of Niggli's value are lower, but C-(al-alk) and K-mg are higher than those of some common basalts. Fig. 8 isZavorickij's petrochemical vector diagram, from which the petrochemical cha-racters of high alkaline property in eastern China basalts are clearly justified. Ⅲ. Serial COMPARISON For ascertaining and understanding the general chemical characters, theCenozoic eastern China basalt and its differentiated associations are divided,based on the SiO_2 content, into 5 chemical types, the average composition ofwhich is given in Table 5A. As the chemical composition of Kuanyinshanvolcanic rocks in Taiwan Province shows a distinct calc-alkaline affinity, it is,therefore, dealt with the same procedure as well. The average chemical compo-sition of the volcanic rocks is given in Table 5 B. Since the Cenozoic basalt ineastern China covers the region adjacent to the Circum-Japan Sea and the Ja-panese Archipelagoes which are well known by the occurrence of alkaline andcalc-alkaline rock suite respectively. The serial variation in the chemical com-position of eastern China volcanic rocks is examinated in comparing them withthose of the Circum-Japan Sea and the Japanese volcanic rocks. The data usedfor the Circum-Japan Sea and Japanese rocks, which are given in Tables 6 A and6 B, are based on Tomita's and Yamada's calculated results respectively. Zavaric-kij's number of the same rocks, based on Zavarickij's data, is given in Table6 C. Following various petrochemical methods, some graphic diagrams are cons-tructed in order to express the chemical characters of the rock series of easternChina more definitely. The difference in chemical composition as comparedwith the Circum-Japan Sea alkaline rock suite is shown in the normal varia-tion diagram Figure 9. Other petrochemical indices (proposed by Peacock, Hol- mes and Tomita respectively) obtained are summarized below: Ⅰ Ⅱ Ⅲ Ⅳ alkali-lime index (Fig. 10) 65.5 59.0 63.0 52.0 alkali-alumina index (Fig. 11) -- -- 67.8 63.3 Ol-Q index (Fig. 12) 20.0 43.0 72.5 76.5 Ne-Hy index (Fig. 13) -- -- 55.0 59.9 Di-C index (Fig. 14) 46.5 46.5 -- -- Ⅰ. Japanese volcanic rocks; Ⅱ. Taiwan volcanic rocks; Ⅲ. Circum-Japan Sea alkaline suite; Ⅳ. eastern China volcanic rocks.From these graphical solutions in Figs. 10-14, it may be justified that thevolcanic rocks in eastern Asia have increasingly enriched the alkali contentfrom the Japanese Archipelagoes to the mainland of China. Figure 15 is avariation diagram of the normative feldspar of the eastern China series, incomparison with that of the Circum-Japan Sea region, the Japanese Archipela-goes and New Zealand. As will be seen from the diagram, the variation of thenormative feldspar of eastern China rock series is quite discriminative. Notonly is it richer in or molecular, but the positions of point N and O (corres-pond to the respective Ol-Q and Ne-Hy indices as shown in Figs. 12 and 13)of the eastern China series are also in a later course than the others. Figure 16is a paragenetic diagram of the normative plagioclase and pyroxlene of theeastern China series. In the variation diagram of the normative pyroxene, Fig.17, the distinct difference in the course of variation between the alkaline andcalc-alkaline series is clearly revealed. In this connection, the directon of varia-tion in the normative pyroxene of the alkaline series differs from that of thecalc-alkaline series. It is also notable that the range of variation in the easternChina series is smaller, due to the presence of higher Wo molecular in bothbasic and acidic types, as compared with that of the Circum-Japan Sea series.Figure 18 is Zavarickij's petrochemical vector diagram of the eastern Chinaseries compared with that of Circum-Japan Sea and Japanese series. It may be acomplemental diagram of the serial comparison diagram of eastern Asia volcanicrock series, prepared by Zavarickij (cf. A. N. Zavarickij's Introduction to Petro-chemistry of Igneous Rocks, 1950, Fig. 61, p. 205, in Russian). The distinctdifference of these rock series may be clearly observed in the graphical solution.In Table 7 A is given the average chemical composition of eastern China basalt,together with the composition of basaltic rocks of the world (including olvinebasalt and Toleiite, Ocean basalt and Continent basalt) for comparison. Theeastern China average is very similar to the average composition of the olivine- basalt of the Circum-Japan Sea region (based on Tomita, 1935, and recalculatedby the writer), while it differed more or less from that of any of the world'sbasalts by the high content of alkali and especially K_20. This character isdefinitely revealed by the normative feldspar and pyroxene, which are graphi-cally shown in Figs. 19 and 21 respectively. Figure 20 is Zavarickij's petroche-mical diagram of the world's basalt. As shown in these diagrams, it suggests atransitional relation rather than a sharp cleft in the petrochemical charactersof the world's basalts. There are no distinct types of basalt magma but rathera continuous series from silica saturated (tholeiitic) to silica-undersaturated(olivine-basalt) rock, although the chemical distinction may be too subtle to beread directly from chemical analyses. Ⅳ. ORIGINAL Basalt Magma The original magma of eastern China basalt belongs to the olivine basaltmagma type. In this discussion it is assumed that the primary olivine basaltmagma is melted from a crust of peridotitic crystalline rock in the upper partof the sima layer. Olivine basalt magma may be modified by the gain of alimited amoun

    ~~

    The studied area is located some 70—80 km. northwest of Nanking of the Kiangsu province, This area is composed of complexly folded late pre-Cambrian metamorphics, deeply eroded to a peneplane. The Changbaling formation is of late Sinian age (dated to be 864—1 ,026 m. y. by Uranium-lead methed), and comprises Volcanics of submarine origin and marine sediments, consisting chiefly of a thick series of quartz keratephyres interealated with minor amount of spilites and related volcanic clastics and tufaceous sediments,...

    The studied area is located some 70—80 km. northwest of Nanking of the Kiangsu province, This area is composed of complexly folded late pre-Cambrian metamorphics, deeply eroded to a peneplane. The Changbaling formation is of late Sinian age (dated to be 864—1 ,026 m. y. by Uranium-lead methed), and comprises Volcanics of submarine origin and marine sediments, consisting chiefly of a thick series of quartz keratephyres interealated with minor amount of spilites and related volcanic clastics and tufaceous sediments, accompanied by marine chert beds, dolomitic limestone lenses, siltstones, and shales. The whole series has suffered to a low-grade regional metemorphism, corresponding to the green schists facies. The rocks of the quartz keratophyres possess porphyritic textures and some rhyolitic flow structures. Their principle mineral constituents are albite 55—70%, quartz 29—40%, muscovite (sericite) 3—7%, with minor amount of microcline, and apatite and magnetite as accessories. Microscopically, the rocks possess obvious successive replacement features. Earlier soda-metamorphism forms albite motacrysts, which include residual masses of orthoclase. Later soda-metamorphism (metasomatism) is represented by albito-quartz veinlets, which cut the earlier albite metacrysts, and also form minute polysynthetically twinned albite rims around their borders. Still later comes some microcline which replaces earlier albite along its cleavage planes and grain borders. Last is silicification. Thus, the sequence of metasomatic replacement is: soda-metamorphism → Soda-silica metasomatism → potassium metasomatism → silicification. Corroded quartz phenocrysts contain minute melting inclusions with some devitrification effects, of which, the temperature of homogenization is measured to be 1,030—1180℃. The decrepitation temperature of the liquid inclusions which occur along certain zones in the bordering parts of quartz crystals, is measured to be 300℃. The spilites here occur as intercalated beds in the quartz keratophyre series, and partly they form dikes or some other sub-volcanic forms. Mineralogically, they are composed of albite, epidote, chlorite, magnetite calcite, sodic actinolire, etc. Similarly, the spilites also show obvious features of sodic replacement. Sugary grains of albite cut or replace earlier-formed albite, forming zigzag boudaries around the latter. All the above features indicate that, both the quartz keratophyres and the spilites were formed as a result of successive soda metamorphism (soda replacement). The petro-chemical characters of the quartz keratophyres and the spilites are as shown in the following table: Based upon the petro-chemical properties and the plotting of the data, as Calculated from a large number of rock analyses, according to the various plotting methods, it is brought out that the metamorphosed volcanics of the Changbaling area belong to sub-alkaline volcanic series, being sodic spilite-quartz keratophyre series. The spilites and quartz keratophyres are comagmatic rocks, and their primary magma was probably intermediate to acidic in character. According to the geologic environments for the formation of the associated sedimentary strata, the volcanic rock combination, and their petrologic and petrochemical char acteristics, the writers are inclined to think, that, such a volcanic-sedimentary series with the acidic volcanic components constituting the major part, was probably formed in rather shallow seas near some continental margin, or close to some island arc during the early stage of development, and that, they are different from those spilites or spilite-keratophyre series with the basic componemts constituting the major parts, which represent probably earlier basic volcanic phases deposited in some deep eugeosynclines, or close to some spreading center of ancient sea floor. Of Course, they are also different from the andesiterhyolite series of continental origin. The primary magma here was probably intermediate to acidic in character, which has differentiated into the acidic and basic extremities. During the course or fractional crystallization, the magmas were contaminated by soda from the sea water and the marine sediments, and later the voicanics suffered from soda metamorphism and metasomatism during the time of deep burial and later regional orogenesis and metamorphism. Such is the writers' idea about the origin of the spilite-Quartz keratophyre series here.

    前寒武纪张八岭建造是一套海底喷发的火山岩系,其原岩由大量石英角斑岩和少数细碧岩及其火山碎屑岩、凝灰质沉积岩组成,并与海相的硅质岩、白云质石灰岩透镜体、粉砂岩、页岩等伴生。受区域变质作用影响,形成绿片岩相的矿物组合。岩石具典型的熔岩组构。主要矿物成分为:石英、低温完全有序的钠长石(An<5)和绿泥石、绿帘石、磁铁矿等。岩石有明显的交代观象,其交代顺序为:钠化→钠硅化→钾化→硅化。据玻璃质固化包裹体测温,其岩浆温度为1030—1180℃;液相包裹体测温,其热液蚀雯温度为300℃。由岩石化学分析资料说明:变质火山岩为弱碱质钠质细碧岩——石英角斑岩系。两者为同源岩浆岩。其原始岩浆成分为——中酸性岩浆。经分异作用,主要向酸性岩浆转化;少量向基性。在岩浆结晶分异的同时并遭受海水及海相沉积物中钠质的混染,成为富钠质的岩浆,逐渐演变成富钠的透岩浆溶液,发生钠质交代,这种作用继续延到岩浆期后的热液期。其后岩石又经低级区域变质作用,形成石英角斑岩及细碧岩。根据变质火山岩的岩石学、岩石化学及火山岩中伴生岩石特征等地质因素,说明:它形成于浅海环境,靠大陆边沿,或岛弧。它是以酸性火山岩为主的,细碧岩——石英角斑岩系,与产于优地槽(或大...

    前寒武纪张八岭建造是一套海底喷发的火山岩系,其原岩由大量石英角斑岩和少数细碧岩及其火山碎屑岩、凝灰质沉积岩组成,并与海相的硅质岩、白云质石灰岩透镜体、粉砂岩、页岩等伴生。受区域变质作用影响,形成绿片岩相的矿物组合。岩石具典型的熔岩组构。主要矿物成分为:石英、低温完全有序的钠长石(An<5)和绿泥石、绿帘石、磁铁矿等。岩石有明显的交代观象,其交代顺序为:钠化→钠硅化→钾化→硅化。据玻璃质固化包裹体测温,其岩浆温度为1030—1180℃;液相包裹体测温,其热液蚀雯温度为300℃。由岩石化学分析资料说明:变质火山岩为弱碱质钠质细碧岩——石英角斑岩系。两者为同源岩浆岩。其原始岩浆成分为——中酸性岩浆。经分异作用,主要向酸性岩浆转化;少量向基性。在岩浆结晶分异的同时并遭受海水及海相沉积物中钠质的混染,成为富钠质的岩浆,逐渐演变成富钠的透岩浆溶液,发生钠质交代,这种作用继续延到岩浆期后的热液期。其后岩石又经低级区域变质作用,形成石英角斑岩及细碧岩。根据变质火山岩的岩石学、岩石化学及火山岩中伴生岩石特征等地质因素,说明:它形成于浅海环境,靠大陆边沿,或岛弧。它是以酸性火山岩为主的,细碧岩——石英角斑岩系,与产于优地槽(或大洋扩张部位)发展早期的蛇绿岩套;包括基性、超基性岩。硅质岩及以基性组分为主的细碧岩——角斑岩建造是迥然不同的。它与岛弧晚期阶段的陆相安山岩——流纹岩也有一定的差别,可能是岛弧早期的产物。

    The studied area is located some 70—80 km.northwest of Nanking of the Kiangsu province.This area is composed of complexly folded late pre-Cambrian metamorphics,deeply eroded to a peneplane.The Changbaling formation is of late Sinian age(dated to be 864—1,026 m.y.by Uranium-lead method),and comprises volcanics of submarine origin and marine sediments,consisting chiefly of a thick series of quartz keratephyres interealated with minor amount of spilites and related volcanic clastics and tufaceous sediments.accompanied...

    The studied area is located some 70—80 km.northwest of Nanking of the Kiangsu province.This area is composed of complexly folded late pre-Cambrian metamorphics,deeply eroded to a peneplane.The Changbaling formation is of late Sinian age(dated to be 864—1,026 m.y.by Uranium-lead method),and comprises volcanics of submarine origin and marine sediments,consisting chiefly of a thick series of quartz keratephyres interealated with minor amount of spilites and related volcanic clastics and tufaceous sediments.accompanied by marine chert beds,dolomitic limestone lenses,siltstones,and shales.The whole series has suffered to a low-grade regional metemorphism,corresponding to the green schists facies. The rocks of the quartz keratophyres possess porphyritic textures and some rhyolitic flow structures.Their principle mineral constituents are albite 55—70%, quartz 20—40%,muscovite(sericite)3—7%,with minor amount of microcline, and apatite and magnetite as accessories. Microscopi(?)ally,the rocks possess obvious successive replacement features. Earlier soda-metamorphism forms albite motacrysts,which include residual mas- ses of orthoclase.Later soda-metamorphism(metasomatism)is represented by albito-quartz veinlets,which cut the earlier albite metacrysts,and also form minute polysynthetically twinned albite rims around their borders.Still later comes some microcline which replaces earlier albite along its cleavage planes and grain borders.Last is silicification.Thus,the sequence of metasomatic repla- cement is:soda-metamorphism→Soda-silica metasomatism→potassium metaso- matism→silicification. Corroded quartz phenocrysts contain minute melting inclusions with some devitrification effects,of which,the temperature of homogenization is measured to be 1,030—1180℃.The decrepitation temperature of the liquid inclusions which occur along certain zones in the bordering parts of quartz crystals,is measured to be 300℃. The spilites here occur as intercalated beds in the quartz keratophyre series, and partly they form dikes or some other sub-volcanic forms.MineralogicaUy, they are composed of albite,epidote,chlorite,magnetite calcite,sodic actinol- ire,etc.Similarly,the spilites also show obvious features of sodie replacement. Sugary grains of albite cut or replace earlier-formed albite,forming zigzag bou- daries around the latter.All the above features indicate that,both the quartz keratophyres and the spilites were formed as a result of successive soda meta- morphism(soda replacement). The petro-chemical characters of the quartz keratophyres and the spilites are as shown in the following table: oxides% rock types SiO_2 K_2O+Na_2O Na2_O K_2O CaO MgO FeO+Fe_2O_3 quartz keratephyres >70(71—78) (?)5—8 >5 1.5± 0.45 0.37 2.13 spilite >40(41—55) >6(4—8) ≈5 0.5± 4.13 3.46 15.65 Based upon the petro-chemical properties and the plotting of the data,as Calculated from a large number of rock analyses,according to the various plot- ting methods,it is brought out that the metamorphosed volcanics of the Chang- baling area belong to sub-alkaline volcanic series,being sodic spilite-quartz ke- ratophyre series.The spilites and quartz keratophyres are comagmatic rocks,and their primary magma was probably intermediate to acidic in character.Accord- ing to the geologic environments for the formation of the associated sedimentary strata,the volcanic rock combination,and their petrologic and petrochemical char acteristics,the writers are inclined to think,that,such a volcanic-sedimentary series with the acidic volcanic components constituting the major part,was prob- ably formed in rather shallow seas near some continental margin,or close to some island arc during the early stage of development,and that,they are dif- ferent from those spilites or spilite-keratophyre series with the basic compo- nemts constituting the major parts,which represent probably earlier basic vol- canic phases deposited in some deep eugeosynclines,or close to some spreading center of ancient sea floor.Of Course,they are also different from the andesite- rhyolite series of continental origin.The primary magma here was probably inter- mediate to acidic in character,which has differentiated into the acidic and basic extremities.During the course or fractional crystallization,the magmas were contaminated by soda from the sea water and the marine sediments,and later the volcanics suffered from soda metamorphism and metasomatism during the time of deep burial and later regional orogenesis and metamorphism.Such is the writers' idea about the origin of the spilite-Quartz keratophyre series here.

    前寒武纪张八岭建造是一套海底喷发的火山岩系,其原岩由大量石英角斑岩和少数细碧岩及其火山碎屑岩、凝灰质沉积岩组成,并与海相的硅质岩、白云质石灰岩透镜体、粉砂岩、页岩等伴生。受区域变质作用影响,形成绿片岩相的矿物组合。岩石具典型的熔岩组构。主要矿物成分为:石英、低温完金有序的钠长石(An<5)和绿泥石、绿帘石、磁铁矿等。岩石有明显的交代观象,其交代顺序为:钠化→钠硅化→钾化→硅化。据玻璃质固化包裹体测温,其岩浆温度为1030—1180℃;液相包裹体测温,其热液蚀变温度为300℃。由岩石化学分析资料说明:变质火山岩为弱碱质钠质细碧岩——石英角斑岩系。两者为同源岩浆岩。其原始岩浆成分为——中酸性岩浆。经分异作用,主要向酸性岩浆转化;少量向基性。在岩浆结晶分异的同时并遭受海水及海相沉枳物中钠质的混染,成为富钠质的岩浆,逐渐演变成富钠的透岩浆溶液,发生钠质交代,这种作用继续延到岩浆期后的热液期。其后岩石又经低级区域变质作用,形成石英角斑岩及细碧岩。根据变质火山岩的岩石学、岩石化学及火山岩中伴生岩石特征等地质,因素,说明:它形成于浅海环境,靠大陆边沿,或岛弧。它是以酸性火山岩为主的,细碧岩——石英角斑岩系,与产于优地槽(或...

    前寒武纪张八岭建造是一套海底喷发的火山岩系,其原岩由大量石英角斑岩和少数细碧岩及其火山碎屑岩、凝灰质沉积岩组成,并与海相的硅质岩、白云质石灰岩透镜体、粉砂岩、页岩等伴生。受区域变质作用影响,形成绿片岩相的矿物组合。岩石具典型的熔岩组构。主要矿物成分为:石英、低温完金有序的钠长石(An<5)和绿泥石、绿帘石、磁铁矿等。岩石有明显的交代观象,其交代顺序为:钠化→钠硅化→钾化→硅化。据玻璃质固化包裹体测温,其岩浆温度为1030—1180℃;液相包裹体测温,其热液蚀变温度为300℃。由岩石化学分析资料说明:变质火山岩为弱碱质钠质细碧岩——石英角斑岩系。两者为同源岩浆岩。其原始岩浆成分为——中酸性岩浆。经分异作用,主要向酸性岩浆转化;少量向基性。在岩浆结晶分异的同时并遭受海水及海相沉枳物中钠质的混染,成为富钠质的岩浆,逐渐演变成富钠的透岩浆溶液,发生钠质交代,这种作用继续延到岩浆期后的热液期。其后岩石又经低级区域变质作用,形成石英角斑岩及细碧岩。根据变质火山岩的岩石学、岩石化学及火山岩中伴生岩石特征等地质,因素,说明:它形成于浅海环境,靠大陆边沿,或岛弧。它是以酸性火山岩为主的,细碧岩——石英角斑岩系,与产于优地槽(或大洋扩张部位)发展早期的蛇绿岩套;包括基性,超基性岩,硅质岩及以基性组分为主的细碧岩——角斑岩建造是迥然不同的。它与岛弧晚期阶段的陆相安山岩——流纹岩也有一定的差别,可能是岛弧早期的产物。

     
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