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isotopic age dating
相关语句
  同位素年龄
     ~(40)Ar-~(39)Ar Isotopic Age Dating on Nanjinshan Gold Deposit and its Implication
     甘肃南金山金矿床的~(40)Ar-~(39)Ar同位素年龄及其地质意义
短句来源
     ~(40)Ar/~(39)Ar ISOTOPIC AGE DATING ON K-FELDSPAR SEPARATES FROM EASTERN HUANIUSHAN GRANITE, GANSU PROVINCE, AND ITS GEOLOGICAL SIGNIFICANCE
     甘肃花牛山东钾长花岗岩~(40)Ar/~(39)Ar同位素年龄及其地质意义
短句来源
     As constrained by relevant isotopic age dating, the podiform chromite was generated about 2. 50Ga.
     依据同位素年龄制约,辽西豆荚状铬铁矿形成于2.50Ga前后。
短句来源
     Re-Os isotopic age dating of molybdenite separates from Elegen porphyry Mo (Cu) mineralized area, northwestern Alxa, western Inner Mongolia
     内蒙古额勒根斑岩型钼(铜)矿化区辉钼矿铼-锇同位素年龄及地质意义
短句来源
  同位素年龄测定
     Based on the 40Ar/ 39Ar isotopic age dating on the sericite, which formed during the ore-forming, two age data were obtained, which are 250.6±2.8Ma and 232.7±4.1Ma, respectively. It indicates that the Nanjinshan gold deposit experienced two stages of ore-forming process.
     本文通过对金矿床中的蚀变绢云母进行了40 Ar 3 9Ar同位素年龄测定 ,获得了两组数据 ,分别为 2 5 0 .6±2 .8Ma和 2 32 .7± 4.1Ma ,说明南金山金矿的形成经历了两期成矿作用。
短句来源
  “isotopic age dating”译为未确定词的双语例句
     Sm-Nd Isotopic Age Dating on Tungsten Oxides from Precious and Nonferrous Metal Deposits and Its Geological Significance
     贵重和有色金属矿床钨氧化钐-钕同位素定年研究及其地质意义
短句来源
     According to the methods of apparent-pole moving Curve ancl isotopic age dating of roek, the intrusive mass was formed cluring Caledonian period instead of Yanshanian
     根据视极移曲线及同位素测定岩石年龄的方法,确定岩体的形成时代为加里东期岩浆活动,以此对燕山期岩浆活动的结论提出质疑。
短句来源
  相似匹配句对
     The Understanding and Use of Rock Isotopic Age
     岩石同位素年龄的理解与使用
短句来源
     ON THE ISOTOPIC AGE OF THE CRETACEOUS LOWER BOUNDARY OF CHINA
     论中国白垩系底界的同位素年龄划分方案
短句来源
     MIDDLE AGE
     中年风韵
短句来源
     It increases with age.
     随年龄增大 ,BPH的发病有增长趋势
短句来源
     the isotopic method;
     古地磁法;
短句来源
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On the basis of the stuoly of anisotropy of magnetic susceptibility (magnetic fabric) this paper proves that the origin of the kimberlite deposit belongs to the intrusive type and expound that it a newtendeney in geological development to replace the measurement of petrological fabric by magnetic fabric. According to the methods of apparent-pole moving Curve ancl isotopic age dating of roek, the intrusive mass was formed cluring Caledonian period instead of Yanshanian

本文主要通过磁化率各向异性即磁性组构的研究,证明山东蒙阴金伯利岩矿床是属于侵入成因,并阐述了用磁性组构取代岩石学组构测量是地质学发展的一种新趋势。根据视极移曲线及同位素测定岩石年龄的方法,确定岩体的形成时代为加里东期岩浆活动,以此对燕山期岩浆活动的结论提出质疑。

The Shixi Formation which rests unconformably on the Ehulin Formation and is unconformably overlain by the Zhoujiadian Formation is the upper part of the Mesozoic volcanic-sedimentary strata. In recent years, a large number of fossil gastropods have been collected from the Shixi Formation in the Shixi region by the authors for the first time. Based on the fossils and isotopic age dating from the middle-upper part of the Shixi Formation in the Shixi region, the biota and its age of the Shixi Formation...

The Shixi Formation which rests unconformably on the Ehulin Formation and is unconformably overlain by the Zhoujiadian Formation is the upper part of the Mesozoic volcanic-sedimentary strata. In recent years, a large number of fossil gastropods have been collected from the Shixi Formation in the Shixi region by the authors for the first time. Based on the fossils and isotopic age dating from the middle-upper part of the Shixi Formation in the Shixi region, the biota and its age of the Shixi Formation are discussed in the present paper. The geological age of the Shixi Formation may be early Early Cretaceous, but the possibility can't be ruled out that the lower part of the Shixi Formation belongs to the late Upper Jurassic.

石溪组以不整合覆盖在鹅湖岭组之上,其上为周家店组所覆盖的中生代火山岩地层上部。近年来,在石溪组中发现大量昆虫化石。对正确划分对比中国南北方陆相中生代地层有重要意义。根据发现的丰富化石及同位素年龄资料,石溪组应属早白垩世早期,但不排除该组下部有部分属晚侏罗世晚期。

Most recently it was demonstrated by isotopic age dating that the most gold deposits in Shandong Province were formed during a short time interval of 115±15 Ma (Earlier Cretaceous), no matter what mineralization type, what kind of geological setting, and where occurred. This fact implies that all the gold deposits might be constraint by a single event at that time. Carbon and oxygen isotope composition of carbonates in gold ores indicates that CO 2 in ore forming fluids was probably derived from deep...

Most recently it was demonstrated by isotopic age dating that the most gold deposits in Shandong Province were formed during a short time interval of 115±15 Ma (Earlier Cretaceous), no matter what mineralization type, what kind of geological setting, and where occurred. This fact implies that all the gold deposits might be constraint by a single event at that time. Carbon and oxygen isotope composition of carbonates in gold ores indicates that CO 2 in ore forming fluids was probably derived from deep interior of the Earth (lithospheric mantle or deeper). Interesting that Earlier Cretaceous was coincided with the key time span of transform of geodynamic regime in eastern North China during Mesozoic, that is, the key time span for strong magmatic activity (particularly magmas of mantle sources), strong extensional tectonic process, strong lithospheric thinning, high speed subduction of western Paleo Pacific plate under Euro-Asian plate, and rising of a possible deep superplume. Thereafter, most of the gold deposits in Shandong Province, or even in the whole eastern North China, was genetically constraint by material/energy rising process during Earlier Cretaceous.

山东金矿研究的最新成果表明 ,胶东众多金矿床 (无论矿化类型、产出空间、地质背景的不同)的成矿时代主要集中在 1 1 5± 1 5Ma(早白垩世 )前后这一狭短的时段内 ,暗示它们都受某一次统一的重大地质事件的制约 .金矿石中碳酸盐矿物的碳氧同位素组成显示成矿流体中的CO2 很可能来自深部 (岩石圈地幔甚或更深 ) .1 1 5± 1 5Ma(早白垩世 )前后正是华北东部中生代动力学体制转折的关键时段 ,此时古太平洋板块向欧亚大陆斜向快速俯冲、华北东部岩石圈剧烈减薄、郯庐断裂发生强烈左行走滑、区域构造应力场转变为强烈引张、火山 -岩浆活动也最为强烈、尤其是深源(幔源 )岩浆活动最为强烈 .同时 ,这也与部分学者提出的超级地幔柱的高潮时段 (1 2 5~ 1 0 0Ma)相吻合 ,暗示可能有深部物质 (不仅是上地幔物质 ,还可能包括下地幔物质 )和热能的大规模强烈上涌 .因此 ,胶东金矿 (以及华北东部的许多其它金矿床 )的形成有可能是 1 1 5± 1 5Ma前后华北东部动力学体制转折过程中一次大规模的深部物质和深部能量上涌的结果

 
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