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Continental hydrothermal sedimentary siliceous rock andgenesis of superlarge germanium(Ge)deposit hosted incoal:A study from the Lincang Ge deposit,Yunnan,china

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Science china Earth {1. 2004年第11期47卷 973-984页

作者： qi huawen1,2,hu ruizhong1,SU Wenchao1,qi liang1 & FENG Jiayi1 1.key laboratory of ore deposit geochemistry,chinese academy of sciences,guiyang 550002,china 2.Department of Earth sciences,Nanjing University,Nanjing 210093,china Correspondence should be addressed to qi huawen(email: qihuawen@***) 1. key {1. of ore deposit geochemistry Chinese Academy of Sciences 550002 Guiyang China 2. Department of Earth sciences Nanjing University 210093 Nanjing China

There are abundant hydrothermal sedimentary structures and plant fragment fossils in the siliceous rocks from the Lincang Ge deposit. The major element compositions of these siliceous rocks are characterized by high content SiO2, low TiO2 and Al2O3concentrations, and low Al/(Al+Fe+Mn) ratios (0.01. on average). The siliceous rocks are distinctly enriched in Ge, Sb, As, W, and secondly enriched in Cs, U, Mo and Tl. Their total REE content are generally less than 1.g/g, LREE relatively concentrated, and the values of Eu anomaly and Ce anomaly vary from 0.452 to 5.1.1.and 0.997 to 1.1.4, respectively. Their NAS-normalized REE patterns are plain or left-inclined. The Oxygen isotope compositions of these siliceous rocks are similar to those of the hydrothermal siliceous sinter. The above characteristics, as well as the geological setting of the deposit, indicate these siliceous rocks formed in continental hydrothermal envi- ronment. As the interlayer or cliff of the Ge-rich coal seams, siliceous rocks tightly contacted with ore-body, and the contents of Ge in siliceous rocks vary from 5.6 to 360 μg/g (78 μg/g on aver- age). The Ge content increased in coal which close to the siliceous rocks. With the increase of Ge content, the typical trace element ratios (i.e., Ge/Ga, Nb/Ta and U/Th) and REE patterns of Ge-rich coal are more close to those of the siliceous rocks. The Ge concentrated in coal seams of the Lincang Ge deposit might be transported by the hydrothermal water, which demonstrated by the siliceous rocks, during the coal-forming processes.

关键词： siliceous rock, continental hydrothermal sedimentation, superlarge Ge deposit, Lincang.

Diagenetic-metallogenic ages of pyritic cherts and their implications in Mojiang nickel-gold deposit in Yunnan Province,{1.

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chinese Science Bulletin 2001年第21期46卷 1823-1827页

作者： FANG Weixuan hu {1. XIE Guiqing SU Wenchao qi liang laboratory of {1. deposit geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550002China Northwest Geological Exploration Bureau Chinese National Nonfer-rous Metal CorporationXi’an 710054China

Diagenetic-metallogenic ages of pyritic cherts formed by the syn-sedimentation of hydrothermal vent and ages of the Jinchang Rock Formation in the Mojiang large nickel-gold deposit in the Ailaoshan gold metallogenic belt have been discussed on the basis of chronology of isotopic {1.. Nickel-gold-bearing pyritic cherts in the mining were formed by syn-sedimentation of hydrothermal vent in the Late Devonian, i.e. age by Sm-Nd isochronal method (t) = (358±8.6) (2σ) Ma and age by Rb-Sr isochronal method (t) = (354.7±0.72) (2σ) Ma. On the other hand, deep-water cherts from the Jinchang Rock Formation of the Upper Devonian in the area were initiated at the same time; that is, age by Sm-Nd isochronal method (t) = (359(+21. (2(7) Ma and age by Rb-Sr isochronal method (t) = (358.02±0.30) (2σ) Ma.

关键词： metallogenic age age by Sm-Nd isochronal method age by Rb-Sr isochronal method Mojiang nickel-gold deposit.

On emplacement ages of lam-proites in Zhenyuan County,Guizhou Province,china

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chinese Science Bulletin 2002年第10期47卷 874-880页

作者： Weixuan Fang ruizhong {1. Wenchao Su Jiafei Xiao liang qi Guohao Jiang chinese Acad Sci Inst Geochem Lab Ore Deposit Geochem Guiyang 550002 Peoples R China

Emplacement ages of lamproites that comprise lamproite and olivine lamproite in Zhenyuan County, Guizhou Province, china, have been constrained by the whole-rock Sm-Nd and Rb-Sr isochron methods and the whole rock K-Ar method. Intrusive activities of lamproites in the Sinantang area of Zhenyuan County, Guizhou Province, took place during the Late Cambrian, as indicated by the Sm-Nd isochron ages (t) = (503±1.) (2σ) Ma and by the Rb-Sr isochron ages (t) = (501.2±4.6) (2σ) Ma. Intrusive activities of olivine lamproites at the Maping with Ⅱ -type diamond and Xitou in Zhenyuan County, Guizhou Province, took place from the Late Cambrian to the Early Ordovician, as evidenced by the Sm-Nd isochron ages (t) = (502±27) (2σ) Ma and by the Rb-Sr isochron age (t) = (502± 27) (2σ) Ma. This suggests that the upwelling hot materials derived from the deep mantle were emplaced from the Late Cambrian to the Early Ordovician (503-497 Ma), while the time terminal of cooling of the geothermal event of

关键词： the Sm-Nd isochron age the Rb-Sr isochron age whole rock K-Ar method lamproite Zhenyuan County of Guizhou Prov-ince china.

Characteristics of rare-earth elements (REE),strontium and neodymium isotopes in hydrothermal fluorites from the Bailashui tin {1. in the Furong ore field,southern hunan Province,china

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chinese Journal Of {1. 2008年第4期27卷 342-350页

作者： YUAN Shunda PENG Jiantang hu ruizhong BI Xianwu qi liang LI Zhaoli LI Xiaomin ShuANG Yan State key {1. of ore deposit geochemistry Institute of Geochemistry Chinese Academy of Sciences Cruiyang 550002 China Graduate School Chinese Academy of Sciences Beijing 100049 China Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China

In this paper the authors present the REE concentrations and Sr and Nd isotopic compositions of fluorites from the Bailashui tin {1. of the Furong ore field,southern hunan Province. The results showed that the total amount of REE in fluorites is usually low,ranging from 0.705 to 8.785 μg/g with the chondrite-normalized REE dis-tribution patterns similar to those of the qitianling granites in the study area,characterized by LREE-enrichment patterns with pronounced negative Eu anomalies. The fluorites vary in Sr isotopic composition within the range of 0.7083-0.7091.the values are lower than those of the granites and higher than those of the host carbonate rocks in this area. The εNd(t) values of fluorites vary between -9.4 and +1..3,revealing that both the crust-and mantle-source materials were involved in the ore-forming hydrothermal fluids. Combined with previous studies on this ore {1.,the Bailashui tin {1. is temporally and spatially closely related with granitic magmatism in this area. The hydro-thermal fluorites are the product of fluid/rock interactions between granitic magmatic hydrothermal fluid and marine carbonate rocks. The REE and F in the ore-forming fluid were derived from the granites,whereas Sr in the ore-forming fluid came mainly from the granitic magmatic hydrothermal fluid and marine carbonate rocks,although variations in Sr isotopic composition cannot be explained by a simple mixture of these two end-members. Evidence demonstrated that the ore-forming fluids are of crustal-mantle mixing origin,but that the fluids were probably in-completely homogenized and this may be caused by inhomogeneous mixing of the fluids of different sources.

关键词：萤石同位素锡沉淀稀有地球元素

U-Pb Zircon Age, Geochemical, and Sr-Nd-Pb Isotopic Constraints on the Age and Origin of Mafic Dykes from Eastern Shandong Province, Eastern china

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Acta Geologica Sinica(English Edition) 2013年第4期87卷 1045-1057页

作者： LIU Shen hu {1. FENG Caixia GAO Shan FENG Guangying LAI Shaocong qi Youqiang Ian M. COULSON YANG Yuhong YANG Chaogui TANG liang State key {1. of Continental Dynamics /Department of Geology Northwest University State key {1. of ore deposit geochemistry Institute of Geochemistry Chinese Academy of Sciences State key {1. of Geological Processes and Mineral Resources China University of Geosciences Solid Earth Studies laboratory Department of Geology University of Regina

U-Pb zircon age, geochemical, and Sr-Nd-Pb isotopic data of mafic dykes from eastern Shandong Province, eastern china is reported herein. Laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） U-Pb zircon analyses of two samples from the investigated mafic dykes yield consistent ages ranging from 1.1.9 Ma ± 0.47 Ma to 1.2.9 Ma ± 0.61.Ma. The mafic dykes are characterized by high （87Sr/86Sr） i ranging from 0.7087 to 0.7089, low εNd（t） values ranging from -1..9 to -1..8, 206Pb/204Pb = 1..1. to 1..1., 207Pb/204Pb = 1..45 to 1..47, and 208Pb/204Pb = 37.59 to 37.68. Results from the current study suggest that the mafic dykes are derived from partial melting of ancient lithospheric mantle that was variably hybridized by melts derived from foundered lower crustal eclogite. The mafic dykes may have been generated through subsequent insignificant crystal fractionation and very minor crustal contamination during magma ascent. Combined with previous studies, the current findings provide new evidence that the intense lithospheric thinning beneath the eastern Shandong Province of eastern china occurred at ~1.0 Ma, and that this condition was caused by the removal of the lower lithosphere （mantle and lower crust）.

关键词： Eastern china eastern Shandong Province foundering mafic dykes North china Craton

西南地区稀散元素伴生成矿的主要类型及伴生富集规律

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地质学报 2019年第6期93卷 1210-1230页

作者：陶琰胡瑞忠唐永永叶霖戚华文樊海峰中国科学院地球化学研究所矿床地球化学国家重点实验室

西南地区稀散元素资源丰富,主要以伴生元素矿床产出,寄主矿床类型主要为沉积岩容矿型铅锌矿(伴生Cd、Ge、Ga、Tl)、锡石硫化物矿床(伴生In、Cd)和沉积型铝土矿(伴生Ga)及含锗煤等。这些矿床往往集中产出,主要分布在三江铅锌铜银多金属... 详细信息

西南地区稀散元素资源丰富,主要以伴生元素矿床产出,寄主矿床类型主要为沉积岩容矿型铅锌矿(伴生Cd、Ge、Ga、Tl)、锡石硫化物矿床(伴生In、Cd)和沉积型铝土矿(伴生Ga)及含锗煤等。这些矿床往往集中产出,主要分布在三江铅锌铜银多金属矿成矿域、川滇黔铅锌多金属成矿域、滇东南锡多金属矿成矿域、黔西北铝土矿含矿带及滇西第三系含煤盆地。本文以滇东南锡石硫化物矿床(个旧、都龙、白牛场)及沉积岩容矿型铅锌矿(包括兰坪金顶铅锌矿和川滇黔铅锌银多金属成矿域中的会泽、大梁子、天宝山和富乐铅锌矿等)等为主要对象,开展了不同金属硫化物中稀散元素含量及电子探针面扫描分析,查定了稀散元素伴生富集的赋存状态,并在矿床地球化学研究基础上,综合分析了这些稀散元素的伴生富集规律。研究结果进一步表明,稀散元素(In、Cd、Ge、Ga、Tl)伴生富集都具有明确的载体矿物专属性:热液矿床中In、Cd、Ge、Ga主要富集在闪锌矿中,Tl主要富集在黄铁矿中;沉积铝土矿中Ga的载体矿物主要是一水铝石,含锗煤中Ge主要以有机质结合态赋存在腐殖体中。在伴生富集规律上,In主要伴生富集在锡石硫化物矿床中,滇东南三大锡石硫化物矿床(个旧、都龙、白牛场)具有相似的地质地球化学特征,成因上与燕山晚期花岗岩侵入密切相关。沉积岩容矿型铅锌矿普遍含有Cd、Ge、Ga、Tl,但不同矿床在不同稀散金属富集程度上存在明显差异,其中,金顶矿床中的闪锌矿高度富Cd,平均含量达1.23%,其成因可能与生物有机作用有关。临沧盆地西缘含锗煤产出在以花岗岩为基底的帮卖陆相含煤碎屑岩盆地中,具有工业意义的Ge只集中在第一含煤段的煤层中,其含煤段有硅质岩和薄层含碳硅质灰岩,在上部缺乏硅质岩的两个含煤段的煤中无Ge矿化。Ga在铝土矿中的伴生富集具有全球性特点,不同成矿时代和不同工业类型铝土矿中都具有镓的伴生富集,含量一般在50×1.^-6~200×1.^-6,贵州铝土矿床主要形成于石炭纪,其矿石以硬水铝石及少量黏土等为主,Ga含量在70×1.^-6~1.3×1.^-6,略高于中国和世界铝土矿中镓的平均值。

关键词：西南地区稀散元素伴生富集成矿规律

西南三江碰撞造山带沉积岩容矿Pb-Zn-Ag-Cu贱金属复合成矿与深部过程

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岩石学报 2019年第5期35卷 1341-1371页

作者：毕献武唐永永陶琰王长明胥磊落戚华文兰青木兰中国科学院地球化学研究所矿床地球化学国家重点实验室贵阳550081 中国地质大学地球科学与资源学院北京100083 中国科学院大学北京100049

西南三江特提斯造山带中新生代沉积盆地中(沱沱河、玉树、昌都和兰坪-思茅地区)发育包括金顶超大型铅锌矿床在内的一系列以沉积岩容矿的Pb-Zn-Ag-Cu贱金属矿床,构成长达千余千米的青藏高原东缘贱金属成矿带。作为大陆碰撞环境成矿谱系... 详细信息

西南三江特提斯造山带中新生代沉积盆地中(沱沱河、玉树、昌都和兰坪-思茅地区)发育包括金顶超大型铅锌矿床在内的一系列以沉积岩容矿的Pb-Zn-Ag-Cu贱金属矿床,构成长达千余千米的青藏高原东缘贱金属成矿带。作为大陆碰撞环境成矿谱系的重要矿床类型,加强这些矿床的理论研究对提高和完善大陆碰撞造山成矿理论和指导找矿勘查等具有重要意义。已有研究表明这些Pb-Zn-Ag-Cu矿床的分布受盆地形成后新生代大型逆冲推覆-走滑构造控制,其容矿岩石和成矿作用特征与SEDEX和MVT矿床存在明显的差异,矿床成矿流体表现出多来源混合的特征,成矿与深部过程密切相关。尽管取得重要进展,但由于缺乏高精度年代学数据制约,成矿动力学背景及其与碰撞造山的时空联系存在较大争议。一些矿床的研究显示复合成矿迹象,但是复合成矿过程与深部驱动等问题仍不清楚。近年来我们以兰坪和昌都盆地的Pb-Zn-Ag多金属矿床和Cu多金属矿床为重点研究对象,系统开展了成矿年代学、成矿流体源-运-储系统和复合成矿机制以及深部过程对成矿制约等方面研究。结果表明,兰坪盆地西缘Cu(Mo)多金属矿床主要形成于48～58Ma,兰坪和昌都盆地Pb-Zn-Ag多金属矿床主要形成于27～33Ma。成矿流体表现出明显的多来源混合的特征,主要存在三种类型:1.变质流体与盆地卤水或大气降水复合成矿,以金满-连城Cu矿床为代表; 2)盆地卤水与大气降水复合成矿,以金顶Pb-Zn矿床为代表; 3)盆地卤水和岩浆流体复合成矿,以拉诺玛Pb-Zn-Sb矿床为代表。兰坪盆地西缘Cu矿床主要形成于新生代印度-欧亚大陆主碰撞挤压阶段,与成矿密切相关的变质流体可能来源于陆-陆碰撞俯冲引起的高压变质。Pb-Zn矿床主要形成于印度-欧亚大陆晚碰撞构造转换环境,构造挤压和造山隆起驱动盆地流体迁移,同期的岩浆活动主要为成矿提供热驱动力或成矿物质。

关键词：沉积岩容矿Pb-Zn-Ag-Cu贱金属成矿复合成矿深部过程三江碰撞造山带