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Age of Yingfeng rapakivi granite pluton on the north flank of Qaidam and its geological significance

Science china Earth Sciences 2004年第4期47卷 357-365页

作者： XIAO Qinghui1,2, LU Xinxiang1,3, WANG Fei4. SUN Yangui5, WEI Xiangdong3 & XING Zuoyun6 1. Division of Granite geology, china Geological Survey, Yichang 4.3003, china 2. Information Center of Ministry of Land and Resources, Beijing 100812, china 3. Geological Survey of Henan Province and Institute of Geological Research of Henan Province, Zhengzhou 4.0053, china 4. Geological Institute, china Seismological Bureau, Beijing 100029, china 5. Geological Survey Institute of Qinghai Province, Xining 810032, china 6. china university of geosciences, Wuhan 4.0074. china Division of Granite geology China Geological Survey Yichang China Information Center of Ministry of Land and Resources Beijing China Geological Survey of Henan Province and Institute of Geological Research of Henan Province Zhengzhou China Geological Institute China Seismological Bureau Beijing China Geological Survey Institute of Qinghai Province Xining China china university of geosciences Wuhan China

The Yingfeng rapakivi granite on the north flank of Qaidam is a newly discovered Proterozoic rapakivi pluton in china, which was found after the discovery of Shachang rapakivi in Miyun County, Beijing and Kuandian rapakivi in Jilin Province. Yingfeng rapakivi pluton is ex-posed on the north side of the suture belt between Qinling-Kunlun orogenic belt and North china plate. U-Pb zircon isotopic dating and Ar-Ar isotopic dating of both hornblende and K-feldspar from the Yingfeng rapakivi granite have been conducted. The results show that the age of (1776±33)Ma at the upper intercept in Concorde diagram represents the age of formation of the plu-ton, whereas the age of (526 281) Ma at the lower intercept and Ar-Ar mineral dating of horn-blende and K-feldspar correspond to the age of a later event affecting the pluton, suggesting that Yingfeng pluton has ever been affected by strong regional Caledonian-Hercynian tectonic movement after its formation. The discovery of middle Proterozoic Yingfeng rapakivi granite pro-vides a petrologic evidence for the timing of cratonization of both the continental crust basement in western china and the basement of the North china plate and for a rifting event taking place in the mid-Proterozoic, suggesting that an amalgamation of ancient china continents had ever happened during the L liang Movement?between the early Proterozoic and the mid-Proterozoic.

关键词： rapakivi, U-Pb dating, Ar-Ar dating, Kunlun-Qinling orogenic belt.

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DUAL-FREQUENCY IP

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中国有色金属学会会刊：英文版 1993年第4期3卷 1-10页

作者： He,Jishan department of geology,Central Sough university of Technology,Changsha 4.0083,china

The dual-frequency(DF)IP is a new kind of frequency domain IP *** only is thedual-frequency current transmitted simultaneously but the electric potential difference due to dualfrequency current is measured *** paper discusses the principle and charateristicof DF current, DF current can be formed by two rectangular currents which must be coherent orelse false Percent Frequency Effect(PEE)will *** currents with different waveforms areequivalent in the ability of detecting IP *** current has much less effect of DFIP than on conventional variable frequency method;in fact,there is no need to stabilize currentin DF IP *** are many differences between harmonic contents of DF current and thatof rectangular wave used in variable frequency method,but theoretical analysis,labaratory mod-eling and field data all show that the anomalies of both DF and variable frequency method are sim-liar in character and close in *** IP can match variable frequeney IP and time domain IPin the ability of detecting IP anomaly,furthermore,dual-frequency IP measurements are morerapid,more accurate and more simple in operation.

关键词： dual frequency IP percent frequency effect IP anomaly

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Bio-organic Geochemical Characteristics of Gold Deposits in Northwestern Guangxi and Their Metallogenetic Significance

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Journal of Earth Science 1995年第2期14卷 54-59页

作者： Zhang Aiyun Xiao Jianxin Weng Chengmindepartment of geology and Energy Resources, china university of geosciences, Beijing 100083

The gold deposits of Triassic period in the northwestern Guangxi are all located in the marine, fine -grained ,fragmental rock series containing organic matter ,i.e .the distribution districts of black rock series . The fine-grained gold deposits occur in organic matter -bearing C, D,E,or D,E divisions of the classical Bouma sequences. The evolution degree of organic matters through oil window stage reached the over -mature degree. Both the bio-sources of the organic matters and the distribution of gold in the organic matters disclose the close association between gold , living beings and organic matters . The thermal evolution of organic matters led to the gold to be activized . migrated and enriched , and finally formed gold deposits in the fault belt and crushed zone of black rock series .

关键词： fine-grained disseminated gold deposit bio- organic geochemistry,metallogenetic significance northwestern Guangxi.

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Vermiform trace fossils from the Precambrian Ruyang Group, western Henan

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Chinese Science Bulletin 1997年第3期42卷 251-254页

作者： HU Jianmin, MENG Qingren and LI Wenhou1 Xi’ an College of geology, Xi’an 710054. china 2. Institute of Geophysics, Chinese Academy of Sciences, Beijing 100101, china 3 department of geology, Northwest university, Xi’an 710069, china Xi’an College of geology Xi’an China Institute of Geophysics Chinese Academy of Sciences Beijing China department of geology Northwest University Xi’an China

THE origin and evolution of Precambrian lives has been a long-standing controversial problem. It is now generally accepted by most paleontologists that the origin of metazoa can be traced back to more than 1000 Ma, because the Ediacara and latest pre-Ediacara fauna, such as the Huainan fauna, are featured by their diversification of forms, complicated structures

关键词： Precambrian trace fossil Ruyang Group.

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Statistical Prediction of Endogenetic Gold Deposit in East Junggar,Xinjiang

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Journal of Earth Science 1995年第2期14卷 84-91页

作者： Hu Wangliang Lu Ruiyingdepartment of Mathematical geology , china university of geosciences , Beijing 100083 Gao Huaizhong Zhang WangshengInstitute of geology and Mineral Resources of Xinjiang , china university of geosciences , Wuhan 4.0074

The system of mineral deposit statistical prediction methods , based on the similarity - analogy theory , searching anomaly theory and the theory of ore - controlling by quantitative assemblage of metallotects , can be summarized into the following aspects : (1) concluding main ore - controlling conditions and ore - hunting indicators from typical deposits; (2)establishing geological concept model of deposits ; (3)selecting geological variable and dividing study units and granting specific value for each variable; (4. by the use of geological and mathematical geology method , building predication model , delineating prospective area for exploration and estimating the total resources; (5) evaluating the prospecting work . It is good practice to use this system for metallogenic prognosis and regional prospecting of gold deposit in East Junggar , Xinjiang and has achieved great success . As a result , we discovered the Kubusu gold mineralized belt . delineated prospective area - estimated total resources of gold in the belt and found out Kubusu gold deposit .

关键词： gold deposit metallogenic prognosis mathematical geology East Junggar ,Xinjiang .

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Identification of 3.5 Ga detrital zircons from Yangtze craton in south china and the implication for Archean crust evolution

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Progress in Natural Science:Materials International 2006年第6期16卷 663-666页

作者： LIU Xiaoming, GAO Shan, LING Wenli, YUAN Honglin and HU Zhaochu (National Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, china university of geosciences, Wuhan 4.0074. china Key Laboratory of Continental Dynamics, department of geology, Northwest {4., Xi' an 710069, china) National Key Laboratory of Geological Processes and Mineral Resources Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China

The LA-ICP-MS U-Pb dating of hundreds of detrital zircon grains from the Sinian sandstones of Liantuo formation and tillites of Nantuo formation at Sanxia area in Yichang identified 3319-3508 Ma zircon grains. Their 207Pb/206Pb and 206Pb/238U ages show excellent agreement (concordia degree 99%-100% ). Their CL images exhibit well-developed oscillatory zoning and the Th/U ratios are within 0.4.-0.76, implying that they are igneous zircons which formed during middle-early Archean. These zircons are the oldest ones discovered in Yangtze craton until now. However, the detrital zircons with ages older than 3. 3 Ga in the metamorphic rocks of Kongling group were not found by further investigation, which suggests the presence of crust older than high-grade metamorphic Kongling terrain in Yangtze craton.

关键词： early Archean detrital zircon zircon dating Yangtze craton.

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Thermal-mechanical coupled effect on fracture mechanism and plastic characteristics of sandstone

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Science china(Technological Sciences) 2007年第6期50卷 833-843页

作者： ZUO JianPing1,2, XIE HePing2,3, ZHOU HongWei1,2 PENG SuPing1 1 State Key Laboratory of Coal Resources and Safe Mining, china university of Mining and Technology, Beijing 100083, china 2 Institute of Rock Mechanics and Fractals, china university of Mining and Technology, Beijing 100083, china 3 Sichuan university, Chengdu 610065, china State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing China Institute of Rock Mechanics and Fractals China University of Mining and Technology Beijing China Sichuan university Chengdu China

Scanning electronic microscopy (SEM) was employed to investigate fractographs of sandstone in mine roof strata under thermal-mechanical coupled effect. Based on the evolution of sandstone surface morphology in the failure process and frac- tography, the fracture mechanism was studied and classified under meso and mi- cro scales, respectively. The differences between fractographs under different tem- peratures were examined in detail. Under high temperature, fatigue fracture and plastic deformation occurred in the fracture surface. Therefore, the temperature was manifested by these phenomena to influence strongly on micro failure mechanism of sandstone. In addition, the failure mechanism would transit from brittle failure mechanism at low temperature to coupled brittle-ductile failure mechanism at high temperature. The variation of sandstone strength under differ- ent temperature can be attributed to the occurrence of plastic deformation, fatigue fracture, and microcracking. The fatigue striations in the fracture surfaces under high temperature may be interpreted as micro fold. And the coupled effect of tem- perature and tensile stress may be another formation mechanism of micro fold in geology.

关键词： sandstone, thermal-mechanical coupled effects, fractograph, plastic deformation, SEM, micro fold

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Characteristics and Origin of Yacheng Gas Field in Qiongdongnan Basin,South china Sea

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Journal of Earth Science 1998年第1期17卷 67-73页

作者： Hao Fang Jiang Jianqun department of Petroleum geology, china university of geosciences, Wuhan 4.0074

The Yacheng gas field lies in the foot wall of the No. 1 fault, the boundary fault between the Yinggehai and Qiongdongnan basins. An overpressured system developed in the Meishan Formation near the No. 1 fault in the gas field and in the adjacent Yinggehai basin. Away from this fault into the Qiongdongnan basin, the overpressure diminishes. Below 3 600 m in the gas field, an obvious thermal anomaly occurs. The gases show obvious compositional heterogeneities which reflect reservoir filling process and origin of the gas field. The gas field was charged from both the Qiongdongnan and the Yinggehai basins but mainly from the former. Hydrocarbons sourced from the Qiongdongnan basin have relatively low maturities while hydrocarbons from the Yinggehai basin have relatively high maturities.

关键词： compositional heterogeneities mixing feature humic origin overpressure Yacheng gas field Qiongdongnan basin South china Sea.

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"Three-Component" Digital Prospecting Method: A New Approach for Mineral Resources Quantitative Prediction and Assessment

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Journal of Earth Science 2004年第3期 6-13页

作者： Zhao Pengda Chioa university of geosciences, Wuhan 4.0074. china Chen Jianping School of the Earth Sciences and Resources, china university of geosciences, Beijing {4., china Chen Jianguo Institute of Mathematical geology, china university of geosciences, Wuhan 4.0074. china Zhang Shouting School of the Earth Sciences and Resources, china university of geosciences, Beijing {4., china Chen Yongqing china Geological Survey, Beijing 100073, china

Three-component" method consists of three close-connected aspects: geological anomaly, diversity of mineralization and mineral deposit spectrum. All these three concepts are not new separately, but it is a new approach to combine these three aspects in one single concept for quantitative mineral resources prediction and assessment and it is also the first time to conduct a more detailed study in each aspect. Investigation and clarification of geological anomalies, diversity of mineralization and spectrum of mineral deposits are realized by digitization and quantification of ore forming controlling factors, ore-existing symbols or marks, characteristics of mineralization and regulation of ore-genesis and laws of distribution. These procedures lead to construction of a "digital model" for mineral resources prediction and assessment.

关键词： three-component" method geological anomaly diversity of mineralization spectrum of mineral deposits.

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Magmatic Activities and Orogenic Process of Taihangshan Intraplate Orogen

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Journal of Earth Science 1999年第1期18卷 80-83页

作者： Luo Zhaohua Deng Jinfu Cao Yongqing Zhao Guochun department of geology and Mineral Resources, china university of geosciences, Beijing 100083

Taihangshan orogen, called as tectonomagmatic belt, is thought to be a part of Mesozoic circum Pacific magmatic arc. On the basis of the studying of intrusive rocks of Taihang Mountains in Yanshanian, we compare the petrochemical and geochemical characteristics and their generation information from intrusives of different periods and regions in details. We suggest the idea of “Taihangshan style orogen” and its generation model. It is suggested that Taihangshan orogen is a new orogenic type, which is controlled by the long distance effect of the subduction between the plate boundaries of Europe Asian and Pacific Ocean, marked by extensive magmatic activity, and characterized by the two way thickening of the crust along the depth dimension.

关键词： orogenic belts superunit lithosphere root plume tectonics Taihang Mountains.

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