检索结果-南通市图书馆

MINERALIZATION AGES OF GOLD-HYDROTHERMAL DEPOSITS IN NORTHERN ZONE OF EASTERN KUNLUN MOUNTAINS BASED ON FISSION TRACK ANALYSIS

引用

地学前缘 2000年第S1期7卷 329-330页

作者： Yuan Wanming 1,Wang Shicheng 1,Mo Xuanxue 2,Wang Lanfen 1[WT5,5”BX](1 Institute of High Energy Physics, chinese academy of sciences, {3. 100080,China 2 China University of Geosciences, {3. 100083.China)

The age of mineralization in a mining area is a primary factor in various researches related to ore\|forming process. It is that the uncertainty of mineralization ages of gold ore deposits in northern zone of eastern Kunlun Mountains, Qinghai Province, restrains to probe the relationship of the deposits to the regional tectonic evolution. This paper documents the fission track method used to determine the ages of gold ore deposits in eastern Kunlun Mountains and considers the implication for the origin of the *** Kunlun Mountains is the northern part of the Qinghai—Tibet Plateau and is of three deep\|seated fault belts in about EW extension. This work mainly includes three gold ore districts. All of them, in the north of Mid\|Kunlun fault belt, belong to northern part of eastern Kunlun Mountains. The Yanjingou district, with geographical coordinate 96°00’E and 3.°10’N, is located 60 km north of Hongqigou district . Both of them are large, typical tectonoalteration gold deposits and were formed in similar geological setting. Hongshuihe ore district is located 50 km east of Yanjingou district and includes tectonoalteration and magmatic cryptoexplosive gold deposits. Outcroped strata are dominantly Jinshuikou Group metamorphic rocks of Lower Proterozoic erathem. The occurrence area of igneous rocks, especially granitoid, accounts for about 90% in first two districts and become less in Hongshuihe district. The gold deposits occur in NW\|striking fault belts. The Rb\|Sr isochron age and K\|Ar isotopic age of Moyite relevant to the gold mineralization are respectively 228 25Ma and 207 1Ma. Rb\|Sr dating of diorite porphyrite is 209 09Ma. Sericite selected from Yanjingou orebody has 252 9Ma K\|Ar age. The ore in Hongqigou district has 197Ma K\|Ar age and 210Ma model age of Pb isotope of galena.

关键词： mineralization age thermal event fission track thermochron ology fission track analysis eastern Kunlun Mountains

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Directly determining 14.0}d/14.Nd isotope ratios using thermal ionization mass spectrometry for geological samples without separation of Sm-Nd

Directly determining 143Nd/144Nd isotope ratios using therma...

引用

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Chao-feng Li,~(*ab)Xian-hua Li,~aQiu-li Li,~aJing-hui Guo~a and Xiang-hui Li~a ~aState Key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,chinese academy of {3.,{4.,100029,China. ~bSchool of Earth {3.,Graduate University of chinese academy of {3.,{4.,10003.,China

Sm-Nd isotopic system is a powerful tracer and dating tool in geochemistry and cosmochemistry. Thermal ionization mass spectrometry(TIMS) is the benchmark method for obtaining high precision Nd isotope ***,a two-step separation was employed in order to obtain high purity Nd fraction,which makes the sample preparation *** this study,we present a new method to directly obtain precise and accurate Nd isotope ratios of geological samples without Sm-Nd separation. The key point is to well correct isobaric interferences of Sm on Nd for this *** accurate intensity of Sm can be obtained using Sm/Sm ratio of 4.87090 and mass discrimination factor of Sm(β),which is achieved using Sm/Sm ratio of 1.08583.with Russell ***,the real intensity of Nd was achieved,then also raw Nd/Nd,Nd/Nd ***,Nd/Nd ratio is normalized using Nd/Nd ratio of 0.7219 following exponential *** accuracy of this method is validated by replicating TIMS measurements for thirteen international reference materials of silicate rock,spanning a wide range of Sm/Nd from 0.13.to 0.4. and bulk *** measured Nd/Nd ratios of the rock standards are in good agreement with the reported values of within error of±0.004..Our new method shortens the analytical procedure and significantly improves sample throughput which greatly contributes to those studies requiring a large dataset and quick analysis.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Zircon shrimp geochronology and geochemistry of TTG rocks in Sushui Complex from Zhongtiao Mountains with its geological implications

引用

Progress in Natural Science:Materials International 2006年第5期16卷 492-500页

作者： TIAN Wei, LIU Shuwen, LIU Chaohui, YU Shengqiang, LI Qiugen and WANG Yueran (Key laboratory of Orogenic Belt and Crustal Evolution, MOE, School of Earth and Space sciences, Peking University, beijing 100871, China) Key laboratory of Orogenic Belt and Crustal Evolution MOE School of Earth and Space Sciences Peking University Beijing 100871 China

The tonalite-trondhjemite-granodiorite (TTG) rocks in Sushui Complex of Zhongtiao Block can be divided into two series according to their zircon U-Pb ages and geochemical characteristics: one is subduction-related (SR) and the other collision-related (CR) . The SR TTG rocks, together with other Late Archean island arc magmatism, were developed as a result of oceanic subduction between the Eastern and Western blocks in Late Archean; while the CR TTG rocks formed in a thickened crustal environment, which was responding to the collision between the Eastern and Western blocks in Paleoproterozoic. All these features support a model that the Zhongtiao Block is a part of the Trans-North China Orogen in the middle of North China Craton.

关键词： Sushui Complex Zhongtiao Block Trans-North China Orogen zircon U-Pb geochronology trace element simulation.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Petrogenesis of Triassic post-collisional syenite plutons in the Sino-Korean craton:an example from North Korea

Petrogenesis of Triassic post-collisional syenite plutons in...

引用

中国科学院地质与地球物理研究所2008学术年会

作者： PENG PENG * +§,MINGGUO ZHAI* +,JINGHUI GUO* +,HUAFENG ZHANG(?) & YANBIN ZHANG + * Key laboratory of Mineral Resources,Institute of Geology and Geophysics,chinese academy of {3., P.O.Box 9825,{4. 100029,China + State Key laboratory of Lithospheric Evolution,{4. 100029,China (?) State Key laboratory of geological Processes and Mineral Resources,China University of Geo{3., {4. 100083.China

More than ten Triassic syenite plutons are revealed to be distributed in North Korea along the boundary to South *** Tokdal Complex is one of these but is unique in its incorporation of early pyroxenite cumulate in the clinopyroxene/amphibole/biotite/nepheline-bearing syenite main body.A shrimp U-Pb zircon age of 224.4.Ma was obtained from a biotite syenite sample. Clinopyroxene in pyroxenite is zoned,with either phlogopite and apatite inclusion or ilmenite and magnetite exsolution,and may have resulted from crystallization at high pressure in an active continental margin arc environment followed by ascent and *** pyroxenite and syenite are enriched in light REE and LILE,but strongly depleted in HFSE,with Sr/860Sr values of～0.7115 andεNd values of -14.to -20(t = 224.Ma).The Tokdal Complex could have originated from an enriched lithospheric mantle and undergone assimilation of juvenile materials during differentiation. It indicates an extension of post-collisional magmatism in the Sino-Korean *** complex along with many other Triassic plutons in the Sino-Korean craton together constitute three syenite belts along the northern,southern and eastern margins of the craton,possibly resulting in its final configuration in eastern Asia.

关键词： North China North Korea Triassic syenite

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Study on Mineralization Age of Xiaoban Gold Deposit, Fujian Province

引用

Journal of China University of Geosciences 2002年第3期13卷 225-233页

作者： Chen Bailin Institute of Geomechanics, CAGS, beijing 100081 Wu Ganguo Faculty of Earth sciences and Mineral Resources, China University of Geosciences, beijing 10008{4.Zhang Da Institute of Geomechanics, CAGS, beijing 100081 Huang Rensheng West Fujian geological Party of FBGMRE, Sanming {4.5000 Wu Jianshe Fujian Bureau of geological and Mineral Resources Exploration, Fuzhou {4.0003 Institute of Geomechanics CAGS Beijing 100081 Faculty of Earth sciences and Mineral Resources China University of Geosciences Beijing 100083 West Fujian geological Party of FBGMRE Sanming 365000 Fujian Bureau of geological and Mineral Resources Exploration Fuzhou 350003

The Xiaoban gold deposit is a large-size deposit recently found in middlearea of Fujian Province. It belongs to magmatic hydrothermal type occurred in Mayuan Groupmetamorphic rocks of Middle Proterozoic and is controlled by low angle fault (detachment)structures. The contents of Au in Mayuan Group metamorphic rocks, Caledonian-Indosinian deformedgranite and early Yanshanian granite are higher with Au enrichment coefficient of 2. 06-5.68, 5.11and 6.67 than those in other geological bodies. And the higher enrichment coefficients (>2) of Ag,S, Sn and Te are similar to those of gold ore. Meanwhile, the distribution of Au in Mayuan Groupmetamorphic rocks and early Yanshanian granite with a low D-value (0.58 and 0.67) is favorable togold mineralization. REE characteristics of gold ore, ratios of (LREE/HREE), (La/Sm)_n, (Yb/Lu)_n,(La/Tb)_n and (Sm/Nd)_n are similar to Mayuan Group metamorphic rocks, only non or little normal Euabnormal of ore is dissimilar to metamorphic rocks. The δ(^(3.)S) of the gold ore, with a highhomogenization, is (-4.7X10^(-3. - (-2.7X 10^(-3.). The study of inclusion indicates 180-24.℃ ofmineralization temperature, 3. 69 %-11. 81 % of salinities and 0. 869-0.991 g/cm^3.of densities ofmineralization fluid. Based on hydrogen and oxygen isotope (δ(^(18)O) = 11. 0 X 10^(-3. -11.7 X10^(-3., δ(D) = (-4. X 10^(-3.) - (-62 X 10^(-3.)) and initial w(^(87)Sr)/w(^(86)Sr) =0. 715,combining to the analysis of geological history, regional metamorphism and magamtic activity, theauthors confirm that the source for the ore fluid was mainly from magmatic, partly from metamorphicwater, and with a little influence of meteoric water. Isotopic dating made on Rb-Sr isochron age of182 Ma, by using alteration minerals of gold-ores from the deposit, indicates that themineralization occurs in early Yanshanian epoch. This is close to the age of 187 Ma of the Anchunmagmatite with a similar alteration and gold mineralization to the Xiaoban gold deposit. The age ofearly Yanshan

关键词： mineralization age early yanshanian epoch xiaoban gold deposit fujian

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

In situ Nd isotopic measurement of natural geological materials by LA-MC-ICPMS

In situ Nd isotopic measurement of natural geological materi...

引用

中国科学院地质与地球物理研究所2008学术年会

作者： YANG YueHeng,SUN JinFeng,XIE LieWen,FAN HongRui & WU FuYuan~+ State Key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,chinese academy of {3.,{4. 100029, China

Using newly determined Sm isotopic abundances for correcting the isobaric interference of Sm on Nd and the established mass bias relationship between Sm and Nd,a series of in situ Nd isotopic measurements were conducted for relatively high Nd concentrations of natural geological materials, including apatite,titanite,monazite and perovskite on a Neptune multi-collector inductively coupled plasma mass spectrometry(MC-ICPMS),coupled to a 193.nm ArF excimer laser ablation *** results show that Ce has no significant influence on the precision and accuracy of Nd isotopic analyses for LREE-enriched geological minerals and that our approach is efficient in obtaining reliable Nd/Nd and Sm/Nd ratios for those materials with Sm/Ndisotope data,the in situ Nd isotopic data can provide important information on geological processes.

关键词： Nd isotope apatite titanite monazite perovskite LA-MC-ICPMS

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Calculation methods for direct internal mass fractionation correction of spiked isotopic ratios from multi-collector mass spectrometric measurements

Calculation methods for direct internal mass fractionation c...

引用

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Zhu-yin Chu~*,Yue-heng Yang,Guo Jinghui,Guang-sheng Qiao State Key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,chinese academy of {3.,{4. 100029,China

It is difficult to do internal mass fractionation corrections for isotope dilution analysis by thermal ionization mass spectrometry(TIMS) or multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS),especially for *** this study,calculation methods for direct internal fractionation correction of spiked isotope analysis by TIMS or MC-ICP-MS cycle by cycle for elements having at least two internal reference isotopic ratios are *** TIMS,direct internal mass fractionation correction calculation methods,based on both power and exponential laws,are derived;whereas for MC-ICP-MS,due to larger mass fractionation effects,only exponential law is *** calculation strategies can be applied for both static and multi-dynamic *** multi-dynamic measurements,the isotope fractionation effect,gain and cup efficiency effects of different collectors,as well as ion beam fluctuation effects are all simultaneously *** calculation methods were verified by Sr isotopic analyses of spiked NBS987 standard solutions by TIMS and Hf isotopic analyses of spiked {3. reference materials by *** addition,precise and accurate calibrations of isotopic ratios of the spikes,based on the calculation methods,are discussed.

关键词： Mass fractionation correction isotope dilution analysis TIMS MC-ICP-MS Calculation method

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

桂北九万大山—元宝山地区锡多金属矿床的地质特征和成矿系列

引用

矿床地质 1987年第4期 23-32页

作者：毛景文中国地质科学院矿床地质研究所

本文从成矿系列角度出发,讨论了桂北九万大山—元宝山地区锡多金属矿床的地质特征和控矿因素,总结了矿化作用在时间上的递变规律和矿床、矿体及元素在空间上的分布特点,并提出了该区的交代系列和交代建造,探讨了锡多金属矿床与其外围贱... 详细信息

本文从成矿系列角度出发,讨论了桂北九万大山—元宝山地区锡多金属矿床的地质特征和控矿因素,总结了矿化作用在时间上的递变规律和矿床、矿体及元素在空间上的分布特点,并提出了该区的交代系列和交代建造,探讨了锡多金属矿床与其外围贱金属矿床之间的联系,最后建立了与雪峰期黑云母花岗岩有关的多金属矿床成矿系列的成矿模式。

关键词：桂北九万人山一元宝山地区锡多金属矿床成矿系列交代系列矿化分带

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rb－Sr isotope DATING ON FENITES FROM BAYANOBO，INNERMONGOLIA，CHINAAND THEIR geologicalIMPLICATIONS

引用

Scientia Geologica Sinica 1994年第4期 457-467页

作者： Yang Xueming(Department of Earth and Space sciences, China University of Science and Technology, Hefei 23.026) Zhang Peishan Tao Kejie Zhang Rengu(Institute of Geology, chinese academy of sciences {4. 100029)Yang Xiaoyong(Department of Earth and Spa

Ｒｂ－ＳｒＩＳＯＴＯＰＥＤＡＴＩＮＧＯＮＦＥＮＩＴＥＳＦＲＯＭＢＡＹＡＮＯＢＯ，ＩＮＮＥＲＭＯＮＧＯＬＩＡ，ＣＨＩＮＡＡＮＤＴＨＥＩＲＧＥＯＬＯＧＩＣＡＬＩＭＰＬＩＣＡＴＩＯＮＳＹａｎｇＸｕｅｍｉｎｇ（Ｄｅｐａｒｔｍ... 详细信息

Ｒｂ－ＳｒＩＳＯＴＯＰＥＤＡＴＩＮＧＯＮＦＥＮＩＴＥＳＦＲＯＭＢＡＹＡＮＯＢＯ，ＩＮＮＥＲＭＯＮＧＯＬＩＡ，ＣＨＩＮＡＡＮＤＴＨＥＩＲＧＥＯＬＯＧＩＣＡＬＩＭＰＬＩＣＡＴＩＯＮＳＹａｎｇＸｕｅｍｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＥａｒｔｈａｎｄＳｐａｃ...

关键词： Rb INNERMONGOLIA CHINAAND THEIR geologicalIMPLICATIONS Sr isotope DATING ON FENITES FROM BAYANOBO

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Review of the Lithium isotope System as a Geochemical Tracer

Review of the Lithium Isotope System as a Geochemical Tracer

引用

中国科学院地质与地球物理研究所2007学术年会

作者： Yan-Jie Tang,~1 Hong-Fu Zhang,and Ji-Feng Ying State Key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,chinese academy of {3., P.O.Box 9825,{4. 100029,China

Lithium isotopes have many advantageous characteristics as geochemical tracers for a wide range of geological processes,covering fluid/melt-mineral interactions from the Earth’s surface to the *** latest developments in Li isotope geochemistry,in terms of measuring techniques, major geochemical reservoirs,the contrasting behaviors during near-surface weathering,and crust/ mantle cycling of materials in subduction zones,as well as the signature of convective mantle,and controlling factors in Li isotopic fractionation are briefly reviewed in this *** better quantification of partition coefficients(mineral-melt/fluid) and fractionation factors(such as temperature and diffusion coefficients),the Li isotope system will become a powerful geochemical tracer in future studies.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：