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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Xinmiao Zhao·Hongfu Zhang·Xiangkun Zhu·Suohan Tang·Yanjie Tang State Key laboratory of Lithopheric Evolution, Institute of Geology and Geophysics, chinese academy of {3., P.O.Box 9825,100029 beijing,China laboratory of Isotopic Geology,MLR,Institute of Geology, chinese academy of geological sciences, 10003. beijing,China

Iron isotopes,together with mineral elemental compositions of spinel peridotite xenoliths and clino-pyroxenites from Hannuoba and Hebi Cenozoic alkaline basalts,were analyzed to investigate iron isotopic features of the lithospheric mantle beneath the North China Craton. The results show that the Hannuoba spinel peridotite xenoliths have small but distinguishable Fe isotopic variations. Overall variations inδFe are in a range of-0.25 to 0.14%o for olivine,-0.17 to 0.17‰for orthopyroxene, -0.21 to 0.27‰for clinopyroxene,and-0.16 to 0.26‰for spinel,*** has the heaviest iron isotopic ratio and olivine the lightest within individual *** clear linear relationships between the mineral pairs on"δ-δ"plot suggest that iron isotopes of mineral separates analyzed have been affected largely by some open system *** broadly negative correlations between mineral iron isotopes and metasomatic indexes such as spinel Cr#,(La/Yb) ratios of clinopyroxenes suggest that iron isotopic variations in different minerals and peridotites were probably produced by mantle metasomatism. The Hebi phlogopite-bearing lherzolite,which is significantly modified by metasomatic events,appears to be much heavier isotopically than clinopyroxene-poor lherzolite. This study further confirms previous conclusions that the lithospheric mantle has distinguishable and heterogeneous iron isotopic variations at the xenoliths scale. Mantle metasomatism is the most likely cause for the iron isotope variations in mantle peridotites.

关键词： Iron isotopes Mantle xenoliths Lithospheric mantle Mantle metasomatism North China Craton

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Zircon shrimp geochronology of the Xinkailing-Kele complex in the northwestern Lesser Xing'an Range,and its geological implications

Zircon SHRIMP geochronology of the Xinkailing-Kele complex i...

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中国科学院地质与地球物理研究所2004学术年会

作者： MIAO Laicheng~1,FAN Weiming~1,ZHANG Fuqing~1, LIU Dunyi~2,JIAN Ping~2,SHI Guanghai~1,TAO Hua~2 & SHI Yuruo~2 1.Institute of Geology and Geophysics,chinese academy of sciences, {3. 100029,China 2.shrimp Lab,Institute of Geology.chinese academy of geological sciences,{3. 10003.,China

Located in the eastern portion of the Xing’an-Mongolian Orogenic Belt(XMOB),the Xinkailing-Kele complex has previously been considered to be Precambrian metamorphic rocks,mainly according to its relatively high metamorphic *** filed observation,however,revealed that the complex is composed mainly of metamorphic rocks(Kele complex),tectono-schists("Xinkailing Group"), and granitoids(Xinkailing granitic complex).Dating on these rocks using advanced shrimp zircon U-Pb technique indicates that:(1) Biotite-plagioclase gneiss from the Kele complex has a protolith age of 3.7±7 Ma(2σ) and a metamorphic age of 216±3.Ma(2σ);(2) the tectono-schist of the"Xinkailing Group"gave a magmatic age of 292±6 Ma(2σ),indicative of felsic volcanic protolith of the schist formed in Late Paleozoic time;and(3. the Menluhedingzi and Lengchuan granites of the Xinkailing granitic complex were emplaced at 167±4(2σ) and 164±4 Ma(2σ),*** results suggest that the Xinkailing-Kele complex is not Precambrian metamorphic rocks and the so-called Precambrian"Nenjiang Block"does essentially not *** combination with regional geological data,we propose that the Kele metamorphic complex is likely related to a collisional tectonism that took place in Triassic time,as indicted by its metamorphic age of 216±3.*** Xinkailing granitic complex was emplaced along the collisional zone during Mid-Jurassic time, likely in a post-orogenic or anorogenic setting.

关键词： zircon shrimp geochronology Xinkailing-Kele complex Lesser Xing’an Range

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The Ashele VMS-type Cu-Zn Deposit in Xinjiang,NW China Formed in a Rifted Arc Setting

The Ashele VMS-type Cu-Zn Deposit in Xinjiang,NW China Forme...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Bo WAN,Lianchang ZHANG and Peng XIANG Key laboratory of Mineral Resources,Institute of Geology and Geophysics,chinese academy of {3.,beijing,China

The Ashele Cu-Zn deposit is a typical VMS deposit in chinese Altay located in the southern margin of the Altaid *** deposit occurred in the polyphase fold system,and the main orebody is located at the hinge of the *** orebodies show lenticular form,and are stratabound by a suite of early to middle Devonian bimodal volcanic *** hosting basalt is low K tholeiite and characterized with high Mg,Fe,Ca and low K,*** basalts show flat REE pattern with Ce negative anomaly(Ce/Ce 0.73.0.76).Niobium,Ta, Zr,Hf are depleted and Rb,Ba,Th,U,Sr,Pb are enriched with respect to the *** the Sr and Nd isotopes show depleted properties,while the(Sr/Sr) and theε(t)range from 0.70469 to 0.70488 and 4.6 to 5.3.*** geochemical and isotopic data from the hosting basalt show that it originates from an island arc *** also report the S isotope data from the massive orebody,andδS‰change from 1.8‰to 5.6‰.The S isotope data provide evidence that the sulfur originates from a mixing source between magma and seawater *** propose that the mafic magma provides the ore-forming metal and some percentage of sulfur,while it also acts as a heat engine which makes the fluids leach the metal from the underlying volcanic *** the geological characteristics of the Ashele and geochemical data,and comparing with other Cu-Zn VMS deposits in the world,we propose that Ashele formed in *** arc setting.

关键词： Altaid orogen Ashele Cu-Zn VMS deposit island arc

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Multi-origin alkanes related to CO_2-rich, mantle-derived fluid in Dongying Sag, Bohai Bay Basin

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chinese Science Bulletin 2002年第20期47卷 1756-1760页

作者： JIN Zhijun, ZHANG Liuping, ZENG Jianhui & YANG LeiBasin & Reservoir Research Center, University of Petroleum, beijing 102249, China Key laboratory for Hydrocarbon Accumulation Mechanism of chinese Ministry of Education, University of Petroleum, beijing 1 Basin and Reservoir Research Center University of Petroleum Beijing 102249 China Key Lab. Hydrocarbon Accumul. Mech. University of Petroleum Beijing 102249 China

With the newly obtained carbon isotope data for the natural gas, a pilot study of multiple-sourced alkanes related to the mantled-derived fluid is presented. The carbon isotope values of alkanes in the Dongying Sag possess the features indicating a general organic origin. However, there are two sub-populations in the isotopic data set, which reflect two specific types of origins. In general, the sub-population with high δ13.CH4 values is related to the CO2-rich, mantle-derived fluid, and it is distributed in the belts where mantle-derived fluid flow and basic volcanic activities have occurred. geological and geochemical studies demonstrate that this variation of methane carbon isotope values in the Dongying Sag is unrelated with the basin bury and thermal histories, types of source rocks, and reactions between basin fluid and rocks. Mixing of mantle-derived fluid and organic sourced hydrocarbons is probably the cause for the variation.

关键词： mantle-derived fluid organic origin hydrocarbons in-teraction carbon isotope.

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geological AND GEOCHEMICAL FEATURES OF THE PERMIAN SHIYINGTAN LOW SULFIDATION EPITHERMAL GOLD DEPOSIT,EASTERN TIANSHAN,NW CHINA

GEOLOGICAL AND GEOCHEMICAL FEATURES OF THE PERMIAN SHIYINGTA...

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中国科学院地质与地球物理研究所2003.术年会

作者： Lianchang Zhang~1,Jinsheng Ji~2,Xingke Yang~2,Kezhang Qin~1,Cunji Xue~2, and Chengyou Feng~3.1 Institute of Geology and Geophysics,chinese academy of sciences,{3.,100029,P.R. China 2 Geosciences Department of Chang-an University,Yanta Road,Xi’an,710054,P.R.China 3.Institute of Mineral Deposits,chinese academy of geological sciences,Baiwanzhuang Road, beijing 10003.,P.R.China

The Shiyingtan gold deposit,located in a Late Paleozoic volcanic sequence along the northern margin of Tarim plate and western part of Kanggurtag metallogenic belt,was the first low-sulfidation epithermal gold deposit discovered in the eastern part of the Tianshan range,NW *** deposit is closely associated with an arcuate fracture system along the margins of a Permian *** mineralization is hosted in andesite,ignimbrites,and volcanic breccia with magmatic ages of ca.290-270 *** main orebodies,with a combined 200 000 oz Au resource,are composed of a series of steep,interconnected, crustiform-banded quartz veins,which together are as wide as 20 m and extend to depths of>200 *** gangue minerals in the ore-bearing veins consist of quartz,chalcedony,calcite,chlorite,adularia and sericite;metallic minerals mainly include pyrite,chalcopyrite,native gold,and *** temperatures and salinities of primary fluid inclusions in quartz vary from 13. to 250℃and from 0.8 to 6.7 wt%NaCl equiv.,*** and oxygen isotope data indicate that the mineralizing fluid was mainly of meteoric *** geologic and geochemical investigations confirm that the Shiyingtan gold deposit is a Late Paleozoic epithermal gold deposit of the adularia-sericite type.

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Mesozoic Multi-phase Magmatism and Gold Mineralization in the Early Precambrian North China Craton,Eastern Hebei Province,China:shrimp Zircon U-Pb Evidence

Mesozoic Multi-phase Magmatism and Gold Mineralization in th...

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中国科学院地质与地球物理研究所2008学术年会

作者： Laicheng Miao,~1 Key laboratory of Mineral Resources,Institute of Geology and Geophysics,chinese academy of {3.,beijing 100029,China Yumin Qiu,~2 Center for Global Metallogeny,Department of Geology and Geophysics,University of Western Australia,Nedlands 6907,Australia Weiming Fan, Key laboratory of Mineral Resources,Institute of Geology and Geophysics,chinese academy of {3.,beijing 100029,China. and Fuqin Zhang Key laboratory of Mineral Resources,Institute of Geology and Geophysics,chinese academy of {3.,beijing 100029,China

The early Precambrian North China craton(NCC) in eastern Hebei Province(also known as the Jidong area) was intruded by granitic batholiths and plutons spatially associated with gold deposits. No consensus has been reached regarding timing and tectonic setting of the gold deposits,chiefly due to the lack of reliable geochronological *** gold deposits in the district are localized by NE-striking faults within granite plutons and/or nearby Archean amphibolites,as well as in Proterozoic sedimentary *** mineralizations in the area are characterized by quartz(±albite) veinand sulfide-disseminated styles;both types of ores have relatively low sulfide contents(3.to 17 wt%NaCl equiv.),HO-CO±CH,N solutions, with CO contents in the inclusions ranging from 5 to 40 mol%.Fluid inclusion homogenization temperatures are between 240 and 400℃,and estimates of the trapping pressures vary significantly from 0.5 to 3.7 *** isotope(O,H,S,C,and Pb) data from these deposits indicate a major magmatic component in the mineralizing fluids and the ore-forming materials,with a partial contribution by Archean host rocks,suggesting that these deposits are basically intrusion-related. shrimp zircon U-Pb geochronology of the gold-hosting granitic intrusions,in combination with previous Ar-Ar and Rb-Sr dates on hydrothermal minerals(e.g.,sericite),indicates that there was no Archean gold mineralization,but instead suggests that at least three episodes of granitic magmatism and associated gold mineralization took place during the Mesozoic.

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Detrital Zircons Transported from North China to Yangtze in the Middle Paleozoic:Implications for Tectonic Evolution in Central China

Detrital Zircons Transported from North China to Yangtze in ...

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中国矿物岩石地球化学学会第十届学术年会

作者： SHE Zhen-bing,MA Chang-qian ,WAN Yu-shengState Key laboratory of geological Processes and Mineral Resource, and Faculty of Earth sciences, China University of Geosciences, Wuhan 43.074,China beijing shrimp Center, beijing 10003.,China

＜正＞ The Qilian-Qinling-Dabie Orogen, the so-called Central China Orogenic Belt, presents the largest exposure of ultra-high pressure/ high pressure metamorphic rocks in the world. Being the most important geological boundary in China, it separates the North China Block （NCB） from the South China Block （SCB）. However, the timing of the amalgamation of the North and South

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

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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

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Directly determining 143.d/144Nd isotope ratios using thermal ionization mass spectrometry for geological samples without separation of Sm-Nd

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

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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.,beijing,100029,China. ~bSchool of Earth {3.,Graduate University of chinese academy of {3.,beijing,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 0.46 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.

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

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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.

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