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Geochemistry and Zircon U-Pb Dating of Changshagou Adakite from the South Altyn UHPM Terrane: Evidence of the Partial Melting of the Lower Crust

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Acta Geologica Sinica(English Edition) 2014年第5期88卷 1454-1465页

作者： KANG Lei LIU Liang WANG Chao CAO Yuting YANG Wenqiang WANG Yawei LIAO Xiaoying State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an Center of geological Survey China Geological Survey College of geological Science and Engineering Shandong University of Science and Technology

Changshagou adakite, an outcrop in the middle segment of the South Altyn Tagh ultra-high pressure metamorphism （UHPM） terrane, contains medium-K cal-alkaline and weakly peraluminous compositions （SiO2 = 66.79% to 68.65%, Al2O3 = 17.48% to 18.31%, K20 ＋ Na20 = 6.32% to 6.88%, K2O/Na2O = 0.25 to 0.33, A/CNK = 1.01 to 1.06）. This outcrop is also enriched with large ion lithophile elements but with depleted high-field strength elements （HFSE） showing clearly negative Nb, Ta, and Ti anomalies. REE distribution patterns show a positive anomaly of Eu （6Eu = 1.15 to 1.31） and weakly enriched with LREE compared with HREE （LREE/HREE = 1.02 to 4.20）. Experimental results and several characteristics, including relatively low Nb/Ta ratios （6.03 to 8.45） and high Sr, Sr/Y, （La/Yb）N and low Y and Yb, which indicate the presence of residual garnet and the absence of plagioclase in the source region, show that adakite may form at a pressure ranging from 1.2 GPa to 1.5 GPa and at a temperature of approximately 900~C. Low Cr, Ni, and Mg# values, trace element patterns, and SiO2- Mg# and SiO2-MgO diagrams indicate that rocks are formed by the partial melting of a thickened lower continental crust. LA-ICP-MS in situ U-Pb dating yields two group ages： 503.1±1.7 Ma （core） and 453.1±3.0 Ma （rim）. The Th/U ratios of the core and the rim are 0.11 to 0.40 and 0.03 to 0.07, respectively. Considering the zircon CL image characteristics, Th/U ratios, and previous studies on regional UHPM rocks, adakite formed at 503.1 ± 1.7 Ma and underwent a tectothermal event as a result of the break-off of the Altyn deep subducted continental crust at 453.1 ± 3.0 Ma.

关键词： South Altyn adakite geochemistry zircon U-Pb age

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Petrogenetic contrastive studies on the Mesozoic early stage ore-bearing and late stage ore-barren granites from the southern Anhui Province

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Science China Earth Sciences 2017年第11期60卷 1920-1941页

作者： YAN Jun HOU TianJie WANG AiGuo WANG DeEn ZHANG DingYuan WENG WangFei LIU JianMin LIU XiaoQiang LI QuanZhong School of Resource and Environmental Engineering Hefei University of TechnologyHefei 230009China Nanjing Institute of Geology and Mineral Resources China Geological SurveyNanjing 210016China 332 geological team of bureau of Geology and Mineral Resources Exploration of Anhui Province Huangshan 245000China

Yanshanian magmatisms are intensive in the southern Anhui Province and can be divided into early （152-137 Ma） and late （136-122 Ma） stages. A Yanshanian granitic zone was found to crop out along Qingshan to Changgai areas in the Ttmxi district in Field investigation which has a genetic link with molybdenum multiple metal mineralization. To be a representative syenitic granite in the southern Anhui Province, the Huangshan pluton has not been found so far to have any genetic link with mineralization. Zircon LA-ICP-MS dating indicate that the four granitic bodies from the Qingshan-Changgai zone have concurrent formed ages from 140~：4 to 141~2 Ma, belonging to the Yanshanian early stage magmatism. However, the Huangshan granite is dated to be 12912 Ma, belonging to the Yanshanian late stage magmatism. The Qingshan-Changgai granites show high SiO2 and K20 contents, low P205 contents and middle A12O3 contents and are high-K calc-alkaline series metaluminum I-type granite. These rocks are characterized by enrichments in the large ion lithophile elements and light rare earth elements （REE）, depletions in the high field-strength elements, and middle degree negative anomalies of Eu, geochemical features of arc or continent crustal derived magma affinities. These rocks have 87Sr/StSr（t） ratios from 0.7120 to 0.7125,εNd（t） values from -7.24 to -4.38 and zircon εHf（t） values of -4.4 to 6.7, similar to that of the coeval ore-bearing granodiorites in the southern Anhui Province. Integrated geochemical studies indicate that the Yanshanian ore-bearing granodiorites were formed by partial melting of the Meso-Neoproterozoic accreted thickened low crust. Meanwhile, the Qingshan-Changgai granites were formed through a AFC process of plagioclase＋amphibole＋Shangxi Group of magmas that formed the ore-bearing granodiorites. The Huangshan granites are characterized by high SiOz and K2O contents, moderate Al2O3 contents, seagull shape REE distributed pattern and distinct Eu negative abnormiti

关键词： Yanshanian Granite Low crust Ore-bearing magmatic rock The south Anhui Province Jiangnan orogenic belt

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Report on 3.4 Ga SHRIMP Zircon Age from the Yuntaishan Geopark in Jiaozuo, Henan Province

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Acta Geologica Sinica(English Edition) 2006年第1期80卷 52-57页

作者： GAO Linzhi ZHAO Ting WAN Yusheng ZHAO Xun MA Yinsheng YANG Shouzheng Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 Chinese Academy of geological Sciences Beijing 100037 Beijing Center of SHRIMP Beijing 100037 Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100037 The Second geological team Bureau of Geology and Mineral Resources of Henan Province Jiaozuo Henan 454100

Using the reported new U-Pb age with the Sensitive High-Resolution Ion Microprobe （SHRIMP Ⅱ）, zircon U-Pb ages were obtained from two samples of K-feldspar felsic paragneiss and K-feldspar gneissoid trondhjemite on the southern margin of the Taihang Mountains in the North China Craton. The protolith of the K-feldspar felsic paragneiss is argillaceous-sandy clastic sedimentary rock, probably deposited in the Neoarchean. Most of the detritus zircons show heavy loss of Pb. Five spots of zircons near the upper point, yield a weighted mean ^207Pb/^206Pb age of 3399±8 Ma, representing an age of the sedimentary source. Two groups of zircons from the K-feldspar gneissoid trondhjemite give weighted mean ^207Pb/^206Pb ages of 2511±13 Ma and 2735±16 Ma respectively. The former represents the emplacement time of the pluton, while the latter is interpreted as the age of the inherited zircons. The new data support that the Archean geological body in the central zone has an affinity with those from the eastern block of the North China Craton.

关键词： Neoarchean SHRIMP supracrustal rock volcanic rock North China Craton

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Cryptoexplosive Breccias in Nanjing-Wuhu Volcanic Area:geological Characteristics and Control on Mineralization

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Chinese Journal Of Geochemistry 1990年第4期9卷 361-372页

作者：赵玉琛 geological team 322 Bureau of Geology and Mineral Resources of Anhui ProvinceMa'anshanAnhui

geological and geochemical characters are discussed for the breccias in the Nanjing -Wuhu area,with special reference to their cryptoexplosive *** close association of mineralization,particularly of iron,with the breccias has been evaluated in terms of geothermal and geochemical evidence.A suc-cessful example in using the breccias as a prospecting indicator is illustrated in this paper.

关键词：角砾岩火山岩地质特征成矿控制岩浆

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Geothermal resources formation conditions and preferred target areas in a certain county of Western Sichuan, China

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Journal of Groundwater Science and Engineering 2019年第1期7卷 61-69页

作者： LI Jun-ya WANG Yu-jue HE Xue-wen XUE Guo-dong XU Huan TIAN Yan-hong ZHAO Li-li CUI Qi-hang No.405 geological team Sichuan Bureau of Geology&Mineral Resources Exploration and Development

The geothermal resource is a form of "green" and renewable energy with huge development potential in terms of both environmental protection and economy. It was concluded that the exposed hot springs were mostly produced when fluids derived from atmospheric precipitation were heated deep and recurrently under the ground, developed banded geothermal reservoir in the pores of fault damage zones, fissure zones, hornification zones and dikes, and then moved upward with analyzing the geological and hydrogeological data as well as hydrochemical types of the naturally exposed hot springs in the studied region so as to ascertain the accumulation conditions of geothermal resources in a particular county in Western Sichuan and opt for suitable target areas for exploring geothermal resources. Four areas where geothermal resources are potentially located were proposed with analysis of their formation conditions based on this notion, and the "epsilon-shaped" structure in Zhimulin, the "epsilon-shaped" structure in Jiaochang, the vortex structure in Rewugou and the arcuate structure in Shidaguan were analyzed in this paper offering a reference for developing and exploiting the geothermal resources in the region as well as studying the development patterns of other hot springs in this region.

关键词： Geothermal resources geological structure Reservoir formation conditions

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Geology and Genesis of Peraluminous Granites in East Tianshan Upper Paleozoic Island Arc Belt

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Chinese Journal Of Geochemistry 1996年第1期15卷 33-43页

作者：顾连兴杨浩严正富廖静娟王金珠 Department of Earth Sciences Nanjing University Nanjing geological team No. 6 Xinjiang Bureau of Geology and Mineral Resources Hami Xinjiang

A peraluminous granite belt occurs along the connecting zone between the TurPan-Hami Precambrian block and the Upper Paleozoic island arc belt. Muscovite granite and two-mica granite are the essential lithological components of that belt. All the potassium feldspars inthese granites are microcline. Heavy minerals are dominated by magnetite. SiO2 contents ofthese granites are greater than 73 % with most of the A/NKC values greater than 1.1, norma-tive corundum values greater than 1. Plots of CIPW norms in the (AL-K-Na)-Ca-(Fe2++ Mg)diagram are mostly situated in the plagioclase-cordierite-muscovite region. The rocks are char-acterized by very low contents of minor elements and ΣREE with strong Eu depletion, δ18Ovalues between 6. 69‰ and 7. 0‰, Rb-Sr isochron age of 260. 2 ± 6. 2 Ma and an initial 87Sr/86Sr ratio of 0. 7052. These granites might have been produced by partial melting of moderatelyacidic volcanites and low-maturity sediments in the basement sequences and could be geneticallyconnected with the southward A-type subduction of the Turpan-Hami block following the clo-sure of the Middle Carboniferous back-arc basin.

关键词：花岗岩弧形岛天山地区古生代成因地质构造

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Sedimentary Facies, Sequence Stratigraphic Patterns in Pre-Cenozoic Inland Compressional Basin: Example from Early Yanshanian Succession of Eastern Yihezhuang Salient, Jiyang Depression, Bohai Bay Basin, China

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Journal of Earth Science 2019年第1期30卷 194-205页

作者： Guangzeng Song Hua Wang Meng Xu Jinda Xu Guoqing Sang School of Resources and Environment University of Jinan shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals Shandong University of Science and Technology Faculty of Earth Resources China University of Geosciences no.1 Institute of Geology and Mineral Resources of shandong Province geological Surveying & Mapping Institute of shandong Province

To improve the success rate of locating hydrocarbon reservoirs in pre-Cenozoic inland compressional basins, taking the Early Yanshanian succession of eastern Yihezhuang salient as an example, this paper studied the sedimentary facies and sequence stratigraphic patterns. First, through seismic profiles, well logs, cores and outcrops, the sequence framework was established and internal sedimentary facies were identified. Further, according to analysis of single-wells and connecting-wells, the vertical evolution and horizontal distribution of sedimentation inside the sequence frameworks were discussed. The following results were acquired:(1) meandering river characterized by dual structures superposing each other was developed, and the dual structures can be further divided into three kinds;(2) the entire Early Yanshanian succession was interpreted as one first-order sequence, composed of three third-order sequences, including SQ-Fz1, SQ-Fz2 and SQ-St from bottom to top. Each third-order sequence can be further divided into three system tracts;(3) in different system tracts, different types of dual structures developed separately, and sedimentary bodies showed different horizontal distribution scales and vertical superposition patterns. Finally, the model of sequence stratigraphic patterns was established. This study enhanced the use of sequence stratigraphy to inland tectonically active basins, and would be helpful to predict reservoirs in pre-Cenozoic residual basins.

关键词： Early Yanshanian succession sequence stratigraphic patterns inland compressional basin meandering river dual structure

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A 3D geological Model Constrained by Gravity and Magnetic Inversion and its Exploration Implications for the World-class Zhuxi Tungsten Deposit, South China

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Acta Geologica Sinica(English Edition) 2020年第6期94卷 1940-1959页

作者： YAN Jiayong LÜ Qingtian QI Guang FU Guangming ZHANG Kun LAN Xueyi GUO Xin WEI Jin LUO Fan WANG Hao WANG Xu Chinese Academy of geological Sciences Beijing 100037China China Deep Exploration Center China Geological Survey&Chinese Academy of Geological SciencesBeijing 100037China School of Geophysics and Measurement-control Technology East China University of TechnologyNanchang 330013China geological Exploration Technology Institute of Anhui Province Hefei 230031China No.912 geological Surveying team of Jiangxi bureau of Geology and Mineral Exploration and Development YingtanJiangxi 335001China

The Zhuxi tungsten deposit in Jiangxi Province,South China,contains a total W reserve of about 2.86 Mt at an average grade of 0.54 wt%WO3,representing the largest W deposit in the *** studies on the metallogeny of the deposit have included its timing,the ore-controlling structures and sedimentary host rocks and their implications for mineral ***,the deep nappe structural style of Taqian-Fuchun metallogenic belt that hosts the W deposit,and the spatial shape and scale of deeply concealed intrusions and their sedimentary host rocks are still poorly defined,which seriously restricts the discovery of new deposits at depth and in surrounding areas of the W *** 3 D geological modeling is an important tool for the exploration of concealed orebodies,especially in brownfield *** are obvious density contrast and weak magnetic contrast in the ore-controlling strata and granite at the periphery of the deposit,which lays a physical foundation for solving the 3 D spatial problems of the ore-controlling geological body in the deep part of the study area through gravity and magnetic *** data(1:50000)and aeromagnetic data(1:50000)from the latest geophysical surveys of 2016-2018 have been used,firstly,to carry out a potential field separation to obtain residual anomalies for gravity and magnetic interactive ***,on the basis of the analysis of the relationship between physical properties and lithology,under the constraints of surface geology and borehole data,human-computer interactive gravity and magnetic inversion for 18 cross-sections were ***,the 3 D geological model of the Zhuxi tungsten deposit and its periphery have been established through these 18 sections,and the spatial shape of the intrusions and strata with a depth of 5 km underground were obtained,initially realizing―transparency‖for ore-controlling *** the analysis of the geophysical,geochemical,and geological charact

关键词： 3D geological modelling gravity and magnetic data interactive inversion tungsten exploration of concealed W mineralization Taqian-Fuchun metallogenic belt Jiangxi province

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The Discovery of Diamonds in Chromitites of the Hegenshan Ophiolite,Inner Mongolia,China

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 341-350页

作者： HUANG Zhu YANG Jingsui Paul T.ROBINSON ZHU Yongwang XIONG Fahui LIU Zhao ZHANG Zhongming XU Wei CARMA State Key Laboratory of Continental Tectonics and DynamicsInstitute of GeologyChinese Academy of Geological Sciences China University of Geosciences Inner Mongolia No.9 Geology Mineral Exploration and Development Institute Institute of Mineral Resources Chinese Academy of Geological Sciences 101 geological team of Sichuan bureau of Geology and Mineral Resources

Diamond, moissanite and a variety of other minerals, similar to those reported from ophiolites in Tibet and northern Russia, have recently been discovered in chromitites of the Hegenshan ophiolite of the Central Asian Orogenic Belt, north China. The chromitites are small, podiform and vein-like bodies hosted in dunite, clinopyroxene-bearing peridotite, troctolite and gabbro. All of the analysed chromite grains are relatively Al-rich, with Cr^# [100Cr/（Cr＋Al）] of about 47-53. Preliminary studies of mainly disseminated chromitite from ore body No. 3756 have identified more than 30 mineral species in addition to diamond and moissanite. These include oxides （mostly hematite, magnetite, ruffle, anatase, cassiterite, and quartz）, sulfides （pyrite, marcasite and others）, silicates （magnesian olivine, enstatite, augite, diopside, uvarovite, pyrope, orthoclase, zircon, sphene, vesuvianite, chlorite and serpentine） and others （e.g., calcite, monazite, glauberite, iowaite and a range of metallic alloys）. This study demonstrates that diamond, moissanite and other exotic minerals can occur in high-Al, as well as high-Cr chromites, and significantly extends the geographic and age range of known diamond-bearing ophiolites.

关键词： diamond moissanite deep mantle minerals chromitites Hegenshan ophiolite InnerMongolia

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Deep Structural Framework and Genetic Analysis of Gold Concentration Areas in the Northwestern Jiaodong Peninsula, China： A New Understanding based on High-Resolution Reflective Seismic Survey

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Acta Geologica Sinica(English Edition) 2018年第5期92卷 1823-1840页

作者： YU Xuefeng SHAN Wei XIONG Yuxin GENG Ke SUN Yuqin CHI Naijie GUO Baokui LI Dapeng LI Hongkui SONG Yingxin YANG Deping shandong Key Laboratory of geological Processes and Resource Utilization in Metallic Minerals Jinan 250013 Shandong China Key Laboratory Of Gold Mineralization Processes and Resources Utilization Minister of Land and Resources shandong Institute of geological Sciences

The gold concentration areas in the northwestern Jiaodong Peninsula constituted an important gold metallogenetic region in Eastern China during the Mesozoic. The deep geological bodies＇ texture characteristic is important for exploring the resources thoroughly and understanding the metallogenic process. The detailed textures were revealed using high-resolution seismic profiles through the three major ore-controlling structures-Sanshandao fault zone, Jiaojia fault zone and Zhaoping fault zone. This study aims to establish a deep structural framework of this area. Based on their formation mechanism, the fault structures developed in the area can be divided into regional and local fault structures. The structural styles are characterised by superimposing their compressional, strike-slip and extensional multi-stage activities. The crust is cut by vertical structures corresponding to a left-lateral strike-slip fault system on the surface. Nearby these structures are the arc-shape structures formed by multi-stage magma intrusions into the upper crust. Bounded by the Tancheng–Lujiang and Muping–Jimo fault zones, the current Jiaodong block, developed a series of NE-trending strike-slip fault systems, was probably formed by the assemblage of several obliquely aligned blocks. The intensive magmatism and hydrothermal activity between the blocks induced large-scale mineralisation. It provides a new angle of view for understanding the cratonic destruction and large ore-concentration formed during the Mesozoic.

关键词： ore concentration area deep exploration strike-slip faults Sanshandao fault zone cratonic destruction shandong

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