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major
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    Study on Yanshanian Magmatic to Hydrothermal Mineralization Processes of Major Tin-Polymetallic Deposit-concentrated Area in South Hunan
    湘南锡多金属矿集区燕山期岩浆—流体—成矿过程研究
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    AN ESTIMATION OF SHEAR STRESS VALUES OF THE SURROUNDING REGIONS BEFORE AND AFTER THE MAJOR TONGHAI EARTHQUAKE OF 1970 FROM BOTH THE MAGNITUDES M_L AND M_s OF MINOR EARTHQUAKES
    由中小地震的震级M_L和M_S估算1970年通海地震前后其周围地区的剪应力值
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    CHARACTERISTICS OF SOURCE BEDS FOR THE MAJOR CENOZOIC SEDIMENTARY BASIN IN CHINA OFFSHORE
    中国近海新生代沉积盆地生油层发育特征
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    THE 18.6 YEAR SEISMIC CYCLE IN GLOBAL MAJOR SEISMIC REGIONS
    全球主要地震区的18.6年地震轮回
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    Analysis of future seismicity of Jing-Jin-Tang region and seven major seismic zones with the extreme-value theory
    Analysis of future seismicity of Jing-Jin-Tang region and seven major seismic zones with the extreme-value theory
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Our major contribution in this paper is to show the following.
      
A major role in this study is also played by arbitrary ultraflat polynomials, that is, including those that are
      
Delivery of vaccine is a major impediment to ensuring vaccine efficacy and compliance.
      
The results indicate that thermodynamic and electronic parameters are major contributors to the activity.
      
The results indicate that electronic and thermodynamic parameters are major contributors to the activity.
      
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Various kinds of acid igneous rocks are found around the Kushan, to theeast of Foochow, Fukien. One earlier variety of the granites, provisionally termedas Kushan Granite, is coarser-grained, often flesh-colored, and biotite-bearing,similar in character to the most frequently seen and widely distributed graniteof whole Fukien; the other, the Kueichi Granite, often intruding into the firstnamed, is colored by different shades of grey, mostly, fine-grained, and mia-rolitie, containing minor amount of hornblende...

Various kinds of acid igneous rocks are found around the Kushan, to theeast of Foochow, Fukien. One earlier variety of the granites, provisionally termedas Kushan Granite, is coarser-grained, often flesh-colored, and biotite-bearing,similar in character to the most frequently seen and widely distributed graniteof whole Fukien; the other, the Kueichi Granite, often intruding into the firstnamed, is colored by different shades of grey, mostly, fine-grained, and mia-rolitie, containing minor amount of hornblende instead of biotite, yet sometimesvarying its texture to felsitic, porphyritic, or even to micro-graphic. In thecourse of weathering, the soils thus formed from these two granites, as well astheir corresponding surface vegetations are also evidently dissimilar. That the Kueichi granite was really intruding into the Kushan is evidencedby its ramifying apophyses in the latter, its broad marginal phase, its miaro- litie cavities elongated and lined parallel to the intrusive contact and the"sericitization front", so to show a convex curvature facing the Kushan Graniteside along their mutual contact. The prevalent strike of the contact of the granites conicides with thefracture and joint systems of the Kushan Granite, one set of which is N65°E,being also parallel to one of the major vertical joints of the Kueichi. This isprobably due to the prolonged fracturing during the formation of Pacificfolding zones of the Chekiang and Fukien coast, rendering the KueichiGranite intruding along the said fracture system yet itself subjected to the samemechanical stress. Rocks correlated to these two granites are found elsewhere in Fukien. Theymay also be comparable to the two granites of Sihwashan, S. Kiangsi, foundby C. S. Mo and his colleagues. The repeated intrusions of the Post-Jurassicgranites may allow to consider the possibility of repeated formations of theirgenetically related ores. The lead-zinc deposits of Yuntai and Lungyai areprobably related to the igneous activity of the Kueichi Granite.

经初步瞭解,福建鼓山分布着两种后侏罗纪花岗岩。这从岩石地面分布上的接触情况与显微镜下观察的岩石中组成成分的接触情况两方面得到证实的。从二者产生状态看来,彼此生成时间甚为接近,而同属於太平洋运动产物,分属早晚期活动。再根据前人各种地质文件,推论出福建各地普遍存在着相当於这两种侵入的花岗岩类岩石。因此,联系到福建后侏罗纪金属矿成矿作用的多次性可能。这在江西西华山已有发现。此后从多次性来研究后侏罗纪的炎成矿床的成矿作用,成为必要了。

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 amount of silica and some alkalies to produce a derived melt, whichappears to coincide with the tholeiitic

~~

This paper deals with the seismicity background before the Haieheng earthquake of February 4, 1975, the earthquake sequence and its space distribution.Normally, there has been very low seismic activity around the meizoseismal re-gion of the Haicheng earthquake. But since February 1, 1975, 527 foreshocks were recorded at the Shipengyu (石硼峪) seismological station located about 20km from their epicenters. The epicenters of such foreshocks are densely concentrated. The signs of the initial motion of their P waves...

This paper deals with the seismicity background before the Haieheng earthquake of February 4, 1975, the earthquake sequence and its space distribution.Normally, there has been very low seismic activity around the meizoseismal re-gion of the Haicheng earthquake. But since February 1, 1975, 527 foreshocks were recorded at the Shipengyu (石硼峪) seismological station located about 20km from their epicenters. The epicenters of such foreshocks are densely concentrated. The signs of the initial motion of their P waves are about the same. With respect to their time of occurrence, the succession appeared as concentration of foreshocks, then a period of quiteness and finally the main shock. Following the main shock there occurred a great many after-shocks.The direction of the major axes of the isoseismal lines of the main shock with in the meizoseismal area coincides with that of the region of aftershocks distribution and the direction of the A nodal plane of the earthquake fault solution. From this, it has been inferred that the strike of the dislocating fault plane of the main shock is NWW. It seems to be a left lateral horizontal slip fault with high dipping angle.Some discussions are also made in connection with a possible method of earthquake prediction immediately before such earthquake sequence.

本文对1975年2月4日发生的海城7.3级地震的震前地震活动背景、地震序列和空间分布上的特征进行了研究。 在海城地震的极震区附近,平时很少有地震活动。但自2月1日开始,距震中20公里的营口市石硼峪地震台连续记录到527次前震。这些前震的震中位置很集中,其P波初动符号比饺一致,在时间分布上出现了密集—平静—大震的现象。大震以后的余震很多。 主震极震区的长轴方向与余震分布区的长轴方向和主震震源机制的A节面相一致。由此推测,主震的错动面为北西西走向,可能是高倾角的左旋平移断层的滑动结果。 文中还对临震预报的方法进行了一些讨论。

 
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