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| 1 | ^(40)Ar-^(39)Ar dating and geological implication of auriferous altered rocks from the middle-deep section of Q875 gold-quartz vein in Xiaoqinling area, Henan,China显示文摘The 40Ar-39Ar age method is employed in this work to analyze the auriferous altered rocks from the middle-deep section of the Q875 gold-quartz vein in the Xiao-qinling area, and the results show that the main gold deposition of the Q875 occurred in ca. 128-126 Ma. As a typical gold-bearing quartz vein in this gold-rich area, the age data obtained from the Q875 also constrain on the metallogenic time of the lode gold deposits developed in the same geological settings. This geochronological study supplies new evidence for further understanding the timing of gold mineralization, the genesis of gold deposits and the geodynamic settings in Xiaoqinling area. | WANG Yitian, MAO Jingwen, LU Xinxiang & YE AnwangInstitute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China Institute of Geological Sciences, Henan Province, Zhengzhou 450053, China Lingbao Bureau of Geology and Mineral | 2002 | Chinese Science Bulletin2002，47，20： | 36 |
| 2 | SHRIMP zircon U-Pb dating for volcanic rocks of the Dasi Formation in southeast Hubei Province,middle-lower reaches of the Yangtze River and its implications显示文摘The Jinniu Basin in southeast Hubei,located at the westernmost part of middle-lower val-ley of the Yangtze River,is one of the important vol-canic basins in East China. Volcanic rocks in the Jin-niu Basin are distributed mainly in the Majiashan Formation,the Lingxiang Formation and the Dasi Formation,consisting of rhyolite,basalt and basaltic andesite,(trachy)-basalt and basaltic trachy-andesite and (trachy)-andesite and (trachy)-dacite and rhyolite respectively,in which the Dasi volcanism is volumet-rically dominant and widespread. The Dasi volcanic rocks were selected for SHRIMP zircon U-Pb dating to confirm the timing of volcanism. The results indi-cate that there exist a large amount of magmatic zir-cons characterized by high U and Th contents in the volcanic rocks. The concordia ages for 13 points are 128 ± 1Ma (MSWD = 3.0). On account of the shape of zircons and Th/U ratios,this age is considered to represent the crystallization time of the Dasi volcan-ism. The volcanic rocks in the Dasi,Majiashan and Lingxiang Formations share similar trace elementand REE partition patterns as well as Sr-Nd isotopic compositions. In combination with the regional geol-ogy,it is proposed that the southeast Hubei volcanic rocks were formed mainly during the Early Creta-ceous,just like other volcanic basins in middle-lower Yangtze valley. A lithospheric extension is also sug-gested for tectonic regime in this region in the Cre-taceous Period. | XIE Guiqing MAO Jingwen LI Ruiling ZHOU Shaodong YE Huishou YAN Quanren ZHANG Zusong | 2006 | Chinese Science Bulletin2006，51，24： | 38 |
| 3 | Hydrothermal ore deposits in collisional orogens显示文摘Hydrothermal ore deposits at convergent plate boundaries represent extraordinary metal enrichment in the continental crust. They are generally associated with felsic magmatism in extensional settings at high thermal gradients. Although their formation is common during accretionary orogeny, more and more ore deposits have been discovered recently in the collisional orogens of China. Because collisional orogeny was operated in a compressional regime at low thermal gradients, it is not favorable for mobilization of ore-forming elements and thus for the production of hydrothermal ore deposits. Nevertheless, continental collision is generally preceded by oceanic subduction, which enables the preliminary enrichment of ore-forming elements in the mantle wedge due to chemical metasomatism by subducting slab-derived fluids. This gave rise to metal pre-enriched domains in the overriding lithosphere, which may be reactivated by extensional tectonism for hydrothermal mineralization either immediately during accretionary orogeny or at a later time during and after collisional orogeny. It is these tectonic processes that have resulted in the progressive enrichment of ore-forming elements through the geochemical differentiation of the subducting oceanic crust, the metasomatic mantle domains and the mafic juvenile crust, respectively, at different depths. Finally, the reactivation of metal pre-enriched domains by continental rifting in the orogenic lithosphere is the key to the metallogenesis of collisional orogens. | Yongfei Zheng Jingwen Mao Yanjing Chen Weidong Sun Pei Ni Xiaoyong Yang | 2019 | Science Bulletin2019，64，3： | 26 |
| 4 | Timing of the formation of the Tianhuashan Basin in northern Wuyi as constrained by geochronology of volcanic and plutonic rocks显示文摘The Tianhuashan Basin is one of the most important volcanic basins in the northern Wuyi,southeastern China,comprising two successive volcanic units,the Daguding Formation and the overlying Ehuling Formation,along with several small associated igneous intrusions.The Lengshuikeng super-large-scale Ag-Pb-Zn deposit,which is closely related to these volcanic-intrusive rocks,is located in the northwestern part of the basin.In order to understand the basin evolution and magmatism,we determined LA-ICP-MS U-Pb zircon ages for the volcanic successions and associated intrusive rocks.U-Pb zircon dating of volcanic units yielded precise ages of 144±1 Ma for crystal tuff in the lower member of the Daguding Formation,142±1 Ma for andesite within the upper member of the Daguding Formation,140±1 Ma for tuffite of the first(i.e.,lowermost) member of the Ehuling Formation,and 137±1 Ma for rhyolitic ignimbrite within the third volcano-stratigraphic member of the Ehuling Formation.Three types of intrusive igneous rocks(quartz syenite porphyry,K-feldspar granite porphyry,and rhyolite porphyry) yielded precise weighted mean 206 Pb/238 U ages of 144±1,140±1,and 140±1 Ma,respectively,suggesting that these intrusions along with the aforementioned volcanics were all emplaced during the Early Cretaceous.In addition,the weighted mean 206 Pb/238 U ages determined on zircon from two samples of a granite porphyry intrusion,which hosts ore mineralization of the Lengshuikeng Ag-Pb-Zn deposit,are 158±1 and 157±1 Ma,indicating emplacement in the Late Jurassic.These new geochronological results for igneous rocks of the Tianhuashan Basin constrain the timing of volcanic and plutonic activity in the basin,and have important implications for our understanding the tectonic history of the region,and for identifying metallogenic types and the timing of ore deposition of the Lengshuikeng deposit. | SU HuiMin MAO JingWen HE XiRong LU Ran | 2013 | Science China Earth Sciences2013，56，6： | 16 |
| 5 | Mesozoic Large-scale Mineralization and Multiple Lithospheric Extensions in South China显示文摘华南是最重要的 polymetallic (钨,锡,铋,铜,银,锑,水银,稀罕金属,重稀土元素元素,黄金和铅锌) 在中国的省。这篇论文在华南描述中生代 large-scalemineralization 的基本特征。大规模矿化作用主要发生在三个 intervals:170-150 妈, 140-126 妈和 110-80 妈。在这些之中,第一个阶段被铜,铅锌和钨矿化作用和第三个阶段主要标记被锡,黄金,银和铀矿化作用主要描绘。钨和听矿化作用主要描绘的 140-126 妈的阶段是从第一的过渡间隔到第三个阶段。考虑到地区性的构造进化的当前的研究结果,在三个阶段的 large-scalemineralization 与有关,这被建议在华南块和北方中国块之间碰撞以后,到 E-Wdirection 的从 N-S 的构造政体的主要压力地的转移,并且球的延期由 Paleo-Pacificplate 的 subductlon 引起了的多重背弧石版印刷。 | MAO Jingwen XIE Guiqing LI Xiaofeng ZHANG Changqing WANG Yitian | 2006 | Acta Geologica Sinica(English Edition)2006，80，3： | 13 |
| 6 | SHRIMP Zircon U-Pb Dating of Alkaline Dykes in the Pobei Area,Beishan Rift,Xinjiang Autonomous Region,China:Implications for Tectonic Setting and Mantle Plume Events显示文摘在在东方 Tianshan orogen 的 Beishan 裂缝, Xinjiang 省, N-S-trending 塘群在 Pobei 区域是在场的。群通过与 Ni-Cu 硫醚矿化作用联系的 270290 妈 mafic-ultramafic 侵入切。这些 mafic-ultramafic 侵入典型地在 Tianshan orogenic 带沿着 E-W 主要差错被发现。我们报导从碱的作文的女同性恋锆石标明日期的虾 U-Pb,它产出 252 | MAO Jingwen Franco PIRAJNO ZHANG Zuoheng WAN Yusheng | 2012 | Acta Geologica Sinica(English Edition)2012，86，4： | 11 |
| 7 | Jurassic Intra-plate Basaltic Magmatism in Southeast China:Evidence from Geological and Geochemical Characteristics of the Chebu Gabbroite in Southern Jiangxi Province显示文摘Geochemical and isotopic investigations have been carried out on the Chebu gabbroite in southern Jiangxi Province, southeast China and these results are compared with gabbro bodies along the coast of Fujian Province in order to understand their magma sources and tectonic implications. The Chebu intrusion formed at the beginning of the Middle Jurassic (172±4.3 Ma). These rocks are Ti-rich and Al-poor in major elements, characterized by strong enrichment in large-ion lithophile elements (LILE) and moderate enrichment in high field strength elements (HFSE) and light rare-earth elements (LREE), without pronounced Nb or Ta anomalies. Age-correlated Sr-Nd isotope ratios show moderately high ranges of (87Sr/86Sr)i from 0.7065 to 0.7086 and 0.5124 to 0.5125 of (143Nd/144Nd)i. The geochemical characteristics of the Chebu gabbroite suggest that it is notably different from island-arc basalt and similar to intra-plate basaltic rocks. By combining interpretations of its geological and geochemical characteristics and the regional geological development history, the Chebu gabbroitic intrusion is thought to be the product of asthenosphere upwelling and rapid lithosphere extension during a transition of tectonic systems in southeast China. The tectonic environment and source characteristics of the intrusion are different from Cretaceous gabbro bodies along the coast of Fujian Province, The former formed in a tectonic environment of rapid intra-plate lithospheric extension and the source characteristics were of a weakly enriched primitive mantle, whereas the latter originated mainly in a volcanic-magmatic arc extensional tectonic environment and the nature of the source was an enriched mantle with more subduct subducted components. | XIE Guiqing MAO Jingwen HU Ruizhong LI Ruiling JIANG Guohao CAO Jinjian ZHAO Junhong | 2005 | Acta Geologica Sinica(English Edition)2005，79，5： | 10 |
| 8 | Mantle plume activity and melting conditions: Evidence from olivines in picritic-komatiitic rocks from the Emeishan Large Igneous Province, southwestern China显示文摘 | Zhaochong Zhang Jingwen Mao Fusheng Wang Yanli Hao John J. Mahoney | 2005 | Episodes2005，28，3： | 10 |
| 9 | Discovery of Lorandite TlAsS_2 at the Distal Au-Tl Deposit in a Skarn system,Fengshan Area,Middle-Lower Yangtze River,Eastern China显示文摘Objective Thallium has been used as an indicator element in geochemical exploration of searching for hydrothermal gold deposits.However,the T1 minerals and mineralization are rare in nature.Lorandite TlAsS_2,a relatively uncommon mineral,has been dominantly discovered in some Carlin gold deposits,and minor SbHg,U and Pb-Zn-Ag deposits.It is of a hydrothermal origin and was typically formed at relatively low temperatures.The relationships between these deposits containing lorandite and intrusions remain a | XIE Guiqing MAO Jingwen HAN Yingxiao JIAN Wei HAN Jingyi | 2017 | Acta Geologica Sinica(English Edition)2017，91，4： | 7 |
| 10 | The possible contribution of a mantle-derived fluid to the Ningwu porphyry iron deposits—Evidence from carbon and strontium isotopes of apatites显示文摘Apatite is a characteristic mineral for the iron deposits in the Ningwu region. Apatite shows a range of d13CPDB values from à9.6& to à0.6&,and most of them with the d13CPDB values distributed in a range of mantle carbon (i.e.,à2& to à9&),except for samples T-06-1 and J-06-3. Apatites in the Ningwu porphyry iron deposits yield a narrow variation range of 87Sr/86Sr values from 0.706326 to 0.707577,similar to those of the volcanic and subvolcanic rocks and higher than that of a typical mantle-derived magmatic apatite (i.e.,about 0.7040),indicating that formation of the apatites was involved with crust material contamination. d13CPDB and 87Sr/86Sr values of the apatite indicate a possible contribution of mantle-derived fluid and material to formation of the Ningwu porphyry iron deposits,supported by regional geology,regional gravities and geochemistry of the volcanic and subvolcanic rocks in the Ningwu region. | Jinjie Yu Jingwen Mao Changqing Zhang | 2008 | Progress in Natural Science:Materials International2008，18，2： | 7 |
| 11 | S, C, O, H Isotope Data and Noble Gas Studies of the Maoniuping LREE Deposit, Sichuan Province, China: A Mantle Connection for Mineralization显示文摘Maoniuping REE 存款,定位了大约 22 km 到 Mlanning 的西南,四川省,是在中国的第二最大的轻 REE 存款,对 Bayan OboFe-Nfo-REE 存款 inihe 随后内部蒙古自治区域。构造地,它位于在 Panxi 裂缝之间的过渡地区和 Longmenshan-Jinpingshan orogenic 地区。它是在碱的复合岩石招待的 acarbonatite 静脉类型沉积物。bastnaesite 重晶石, bastnaesite 方解石,和 bastnaesite-microcline 矿脉是主要 REE 矿石矿脉的三种类型。在这些之中,第一条矿脉最广泛地被散布,它的 REE 矿化作用最强壮。在存款的矿石的 barltes 的 DELTA^(34 )S_(V-CDT ) 价值每千条 Inthe bastnaesite 重晶石矿脉在 bastnaesite 方解石矿脉和 +33 每千在 +5.0 的一个狭窄的范围变化到 +5.1 到 +5.9,显示出导出岩浆的硫的同位素的特征。分别地,O_(V降雪)在bastnaesite方解石矿脉珍视的TheDELTA^( 13 )C_( V-PDB )价值和DLETA^( 18 )每千每千并且从 +7.3 从 -3.9 到 -6.9 到 +9.7 它掉进“主要 carbonatites ”的范围,在 Maoniupingdeposit 的矿石显示出那碳和氧主要从深来源被导出。液包体的 DELTA^(13 )C_(V-PDB ) 价值每千从 -3.0 变化到 -5.6,与到在 bastnaesite 方解石矿脉的每千的 -4.0 的 -3.0 和到在 bastnaesite 重晶石矿脉的每千的 -5.6 的 -3.0,它显示出特征导出 ofmantle 的碳。detla^(18O_((H_2OV ) 液包体的 -SMOW)) 价值每千从 -57 to-88 ,与到 -86 的 -63 每千在到 -88 的 bastnaesite 方解石矿脉和 -57 每千在 bastnaesite 重晶石矿脉,它导出披风的氢的表演特征。TheDELTA^(18 )O_(H_2OV 降雪) 价值每千从 +7.4 变化到 +8.6 在。bastnaesite-calcitelode,和 +6.7 到 +7.8 每千在 bastnaesite 重晶石矿脉,几乎重叠范围 of+5.5 到 +9.5 每千为 magmatic。~ 4He 内容, R/Ra 比率是(13.95 to119.58 )X10^(-6)(cm^3/g )_(STP ) 并且 0.02 ~ 0.11,分别地并且 ^(40 )Ar/^(36 ) Ar 是 313 +- 1 to437 +- 2。就放射性元素的高内容引起的 4He 增加而言,导出 amantle 的液体可能在 fluorlte,方解石和 bastnaesitesamples 在包括存在。Maoniuping 存款和它的联系 carbonatite 碱的建筑群在 40.3to 被形成 12.2 妈根据 K-Ar 和 U-Pb 数据。所有这些数据建议披风液体的大数量通过一个差错系统涉及 Maoniuping REE 存款的 metallogenic 进程。 | TIAN Shihong DING Tiping MAO Jingwen LI Yanhe YUAN Zhongxin | 2006 | Acta Geologica Sinica(English Edition)2006，80，4： | 6 |
| 12 | SHRIMP Zircon U-Pb and Molybdenite Re-Os Datings of the Superlarge Donggou Porphyry Molybdenum Deposit in the East Qinling,China,and Its Geological Implications显示文摘摘要:在东方 Qinling 铝带的东方部分定位了, Donggou 存款是在最近的年里发现的 superlarge 斑岩铝存款。作者执行了在 Donggou 铝存款的使矿物化的斑岩和矿石的高度精确的标明日期。Donggou 铝土的 A 类型花岗石斑岩标明日期的虾 U-Pb 锆石给了 112 楬瑡摥 ? 的形成岩石的年龄 ??????? | YE Huishou MAO Jingwen LI Yongfeng GUO Baojian ZHANG Changqing LIU Jun YAN Quanren LIU Guoyin | 2008 | Acta Geologica Sinica(English Edition)2008，82，1： | 6 |
| 13 | Geochemistry of Apatite from the Apatite-rich Iron Deposits in the Ningwu Region,East Central China显示文摘磷灰石的四种类型在 Ningwu 区域被识别了。磷灰石的第一种类型广泛地在中间的黑暗有颜色的地区被散布(即铁矿) 单个存款。集合包括磁铁矿,磷灰石和阳起石(或透辉石) 。Thesecond 类型在铁矿发生在磁铁矿磷灰石静脉以内。第三种类型是看见的 inmagnetite 磷灰石静脉并且(或) 在主人岩石中的小瘤(即斑粝岩闪长岩斑岩 orgabbro 闪长岩或辉石闪长岩) 。第四种类型在在 Xiangshan 组充满破裂的 apatite-pyrite-quartz 静脉以内发生。在斑岩铁矿床的四出现的磷灰石的稀土元素元素(REE ) 地球化学被介绍。磷灰石的 REE 分发模式通常类似于在 Kiruna 类型铁矿的磷灰石的那些, nelsonites。他们在轻 REE 被充实,与显著否定 Eu 异例。在从在在世界上的不同地点的各种各样的存款的磷灰石的 REE 分发模式的类似为各种各样的矿石类型显示形成的一个普通过程,例如 immiscibility。早 magmatic 磷灰石 contain3031.48-12080 x 10 ^(-6) REE。后来热水的磷灰石包含 1958 x10^(-6) REE,显示以后热水的形成矿石的答案包含降低 REE。尽管斑粝岩闪长岩斑岩和磷灰石显示出类似的 REE 模式,斑粝岩闪长岩斑岩没有铕异例或微弱的积极或微弱的否定的铕异例,在一个高氧易逃逸条件下面由披风源地的减小环境并且由分别和结晶化(immiscibility ) 引起了。磷灰石的否定 Eu 异例被更早的 diopsite 在矿石岩浆冷却期间由于 Eu^(2+) 的获得可能形成。在 Aoshan 和泰山铁矿床的磷灰石产出Sr/^( 86 ) Sr 从 0.7071~0.7073 珍视的^( 87 )的一个狭窄的变化范围,类似于那些暴烈并且潜水艇火山岩,显示磷灰石被液体 immiscibility 和中间、基本的岩浆的区别形成。 | YU Jinjie ZHANG Qi MAO Jingwen YAN Shenghao | 2007 | Acta Geologica Sinica(English Edition)2007，81，4： | 5 |
| 14 | Geochronology of the Gabbro-mafic Microgranular Enclaves-granite Associations in the Gejiu District, Yunnan Province and Their Geodynamic Significance显示文摘Many igneous rocks distribute in Gejiu tin polymetallic ore-field at Yunnan province, rocks including basalt, gabbro, mafic microgranular enclaves, granites (porphyritic granite and equigranular granite) and akaline rocks. The ages of the granites and akaline rocks which are considered to have genetic connecting with the mineralization have been comfirmed, but the gabbro- mafic microgranular enclaves-granite assemblage's ages are still unknown. By means of LA-ICP-MS zircon U-Pb dating, the data of Shenxianshui equigranular granite, the mafic microgranular enclave in Jiasha area, the host rock of the mafic microgranular enclaves and the Jiasha gabbro are around ~80 Ma. Besides the above mentioned data, a group of new ages at ~30 Ma were discovered in this study, which is from gabbro and mafic microgranular enclaves. Based on the previous data and the new data gained this time, we suggest the major geochronology framework of the magmatism and mineralization events in Gejiu area is ~80 Ma, which is consistent with the Late Cretaceous magmatism and mineralization events in the whole southeast Yunnan and west Guangxi area and they were suggested to belong to the same geotectonic setting in late Yenshannian. And the new ages of the ~30 Ma obtained in this study is considered to represent a responding to the complicate tectonic evolution history of the Tibetan orogenic events in Cenozoic. | CHENG Yanbo MAO Jingwen | 2012 | Acta Geologica Sinica(English Edition)2012，86，3： | 5 |
| 15 | Newly Discovered Native Gold and Bismuth in the Cihai Iron-Cobalt Deposit, Eastern Tianshan, Northwest China显示文摘The Cihai iron-cobalt deposit is located in the southern part of the eastern Tianshan ironpolymetallic metallogenic belt. Anomalous native gold and bismuth have been newly identified in Cinan mining section of the Cihai deposit. Ore formation in the deposit can be divided into three stages based on geological and petrographical observations:(I) skarn, with the main mineral assemblage being garnet-pyroxene-magnetite;(II) retrograde alteration, forming the main iron ores and including massive magnetite, native gold, native bismuth, and cobalt-bearing minerals, with the main mineral assemblage being ilvaite-magnetite-native gold-native bismuth; and(III) quartz-calcitesulfide assemblage that contains quartz, calcite, pyrrhotite, cobaltite, and safflorite. Native gold mainly coexists with native bismuth, and they are paragenetically related. The temperature of initial skarn formation was higher than 340℃, and then subsequently decreased to ~312℃ and ~266℃. The temperature of the hydrothermal fluid during the iron ore depositional event was higher than the melting point of native bismuth(271℃), and native bismuth melt scavenged gold in the hydrothermal fluid, forming a Bi-Au melt. As the temperature decreased, the Bi-Au melt was decomposed into native gold and native bismuth. The native gold and native bismuth identified during this study can provide a scientific basis for prospecting and exploration for both gold- and bismuth-bearing deposits in the Cihai mining area. The gold mineralization in Cihai is a part of the Early Permian Cu-Ni-Au-Fe polymetallic ore-forming event, and its discovery has implications for the resource potential of other iron skarn deposits in the eastern Tianshan. | ZHENG Jiahao MAO Jingwen YANG Fuquan CHAI Fengmei LIU Feng | 2016 | Acta Geologica Sinica(English Edition)2016，90，3： | 5 |
| 16 | Tubeimoside-1 induces TFEB-dependent lysosomal degradation of PD-L1 and promotes antitumor immunity by targeting mTOR显示文摘Programmed cell death ligand 1(PD-L1)/programmed cell death protein 1(PD-1)cascade is an effective therapeutic target for immune checkpoint blockade(ICB)therapy.Targeting PD-L1/PD-1 axis by small-molecule drug is an attractive approach to enhance antitumor immunity.Using flow cytometry-based assay,we identify tubeimoside-1(TBM-1)as a promising antitumor immune modulator that negatively regulates PD-L1 level.TBM-1 disrupts PD-1/PD-L1 interaction and enhances the cytotoxicity of T cells toward cancer cells through decreasing the abundance of PD-L1.Furthermore,TBM-1 exerts its antitumor effect in mice bearing Lewis lung carcinoma(LLC)and B16 melanoma tumor xenograft via activating tumor-infiltrating T-cell immunity.Mechanistically,TBM-1 triggers PD-L1 lysosomal degradation in a TFEB-dependent,autophagy-independent pathway.TBM-1 selectively binds to the mammalian target of rapamycin(m TOR)kinase and suppresses the activation of m TORC1,leading to the nuclear translocation of TFEB and lysosome biogenesis.Moreover,the combination of TBM-1 and anti-CTLA-4 effectively enhances antitumor T-cell immunity and reduces immunosuppressive infiltration of myeloid-derived suppressor cells(MDSCs)and regulatory T(Treg)cells.Our findings reveal a previously unrecognized antitumor mechanism of TBM-1 and represent an alternative ICB therapeutic strategy to enhance the efficacy of cancer immunotherapy. | Xiaojia Liu Mingxiao Yin Jingwen Dong Genxiang Mao Wenjian Min Zean Kuang Peng Yang Lu Liu Na Zhang Hongbin Deng | 2021 | Acta Pharmaceutica Sinica B2021，11，10： | 5 |
| 17 | Single-zircon dating of Precambrian strata in the west sector of the northern Qilian Mountains and its geological significance显示文摘Single_zircon evaporation method was employed in the present study to determine the age of the iron_bearing rock series in Precambrian strata in the western sector of the northern Qilian Mountains. Three zircon ages from the diabase of the Aoyougou ophiolite previously put into Upper Lithologic Formation of the Zhulongguan Group are (1 840±2), (1 783±2) and (1 784±2) Ma respectively, whereas the zircon ages from the welded breccias in the Zhulongguan Group are (733±7), (738±4) and (604±6) Ma respectively. These results show that they should belong to the bottom of the middle Proterozoic and the upper part of upper Proterozoic respectively. | Jingwen Mao Zhaochong Zhang Jianmin Yang Biao Song Maobing Wu Guochao Zuo | 1998 | Chinese Science Bulletin1998，43，15： | 5 |
| 18 | Genesis of the Changba–Lijiagou Giant Pb-Zn Deposit, West Qinling, Central China: Constraints from S-Pb-C-O isotopes显示文摘The extensive Changba-Lijiagou Pb-Zn deposit is located in the north of the Xihe–Chengxian ore cluster in West Qinling. The ore bodies are mainly hosted in the marble, dolomitic marble and biotite-calcite-quartz schist of the Middle Devonian Anjiacha Formation, and are structurally controlled by the fault and anticline. The ore-forming process can be divided into three main stages, based on field geological features and mineral assemblages. The mineral assemblages of hydrothermal stage I are pale-yellow coarse grain, low Fe sphalerite, pyrite with pits, barite and biotite. The mineral assemblages of hydrothermal stage II are black-brown cryptocrystalline, high Fe shalerite, pyrite without pits, marcasite or arsenopyrite replace the pyrite with pits, K-feldspar. The features of hydrothermal stage III are calcite-quartz-sulfide vein cutting the laminated, banded ore body. Forty-two sulfur isotope analyses, twenty-five lead isotope analyses and nineteen carbon and oxygen isotope analyses were determined on sphalerite, pyrite, galena and calcite. The δ34 S values of stage I(20.3 to 29.0‰) are consistent with the δ34 S of sulfate(barite) in the stratum. Combined with geological feature, inclusion characteristics and EPMA data, we propose that TSR has played a key role in the formation of the sulfides in stage I. The δ34 S values of stage II sphalerite and pyrite(15.1 to 23.0‰) are between sulfides in the host rock, magmatic sulfur and the sulfate(barite) in the stratum. This result suggests that multiple S reservoirs were the sources for S2-in stage II. The δ34 S values of stage III(13.1 to 22‰) combined with the structure of the geological and mineral features suggest a magmatic hydrothermal origin of the mineralization. The lead isotope compositions of the sulfides have 206 Pb/204 Pb ranging from 17.9480 to 17.9782, 207 Pb/204 Pb ranging from 15.611 to 15.622, and 208 Pb/204 Pb ranging from 38.1368 to 38.1691 in the three ore-forming stages. The narrow and symmetric distributions of the lead isotope values reflect homogenization of granite and mantle sources before the Pb-Zn mineralization. The δ13 CPDB and δ18 OSMOW values of stage I range from-0.1 to 2.4‰ and from 18.8 to 21.7‰. The values and inclusion data indicate that the source of fluids in stage I was the dissolution of marine carbonate. The δ13 CPDB and δ18 OSMOW values of stage II range from-4 to 1‰ and from 12.3 to 20.3‰, suggesting multiple C-O reservoirs in the Changba deposit and the addition of mantle-source fluid to the system. The values in stage III are-3.1‰ and 19.7‰, respectively. We infer that the process of mineralization involved evaporitic salt and sedimentary organic-bearing units interacting through thermochemical sulfate reduction through the isotopic, mineralogy and inclusion evidences. Subsequently, the geology feature, mineral assemblages, EPMA data and isotopic values support the conclusion that the ore-forming hydrothermal fluids were mixed with magmatic hydrothermal fluids and forming the massive dark sphalerite, then yielding the calcite-quartz-sulfide vein ore type at the last stage. The genesis of this ore deposit was epigenetic rather than the previously-proposed sedimentary-exhalative(SEDEX) type. | WEI Ran WANG Yitian MAO Jingwen HU Qiaoqing QIN Siting LIU Shengyou YE Dejin YUAN Qunhu DOU Ping | 2020 | Acta Geologica Sinica(English Edition)2020，94，4： | 4 |
| 19 | U-Pb Zircon Dating of the Yeniutan Granitic Intrusion in the Western Sector of the North Qilian Mountains显示文摘Zircons from granodiorite and biotite granite in the Yeniutan granitic intrusion in the western North Qilian Mountains yielded a weighted mean 206Pb/238U apparent age of 460±3 Ma, suggesting that the intrusion originated during the late stage of plate subduction. Its related Ta’ergou and Xiaoliugou deposits are two of the few large tungsten deposits formed in the plate subduction environment in the world. The U-Pb dating of the zircons from the biotite granite gave a discordant lower intercept age of 183±4 Ma, which implies that the Yanshanian event was probably superimposed on the North Qilian region. | MAO Jingwen ZHANG Zuoheng JIAN Ping WANG Zhiliang YANG Jianmin ZHANG Zhaochong | 2000 | Acta Geologica Sinica(English Edition)2000，74，4： | 3 |
| 20 | The Igneous Rock Series and Tin Polymetailic Minerogenetic Series in the Tengchong Area, Yunnan显示文摘This paper discusses the late Yanshanian-Himalayan igneous rock series and minerogenetic series (Cheng et al., 1979, 1982) related to tin polymetallic deposits in the Tengchong area. The multi-stage differentiation and evolution of the igneous rock series led to the concentration of metal and ore-forming elements in a cupola of a granite body formed in the late stage. The minerogenetic series shows a zoning of Nb-Ta-W-Sn, Sn-Fe and Sn around the cupola in space and a multi-stage regularity in time. Finally a minerogenetic model and three key factors of tin minerogenesis are put forward for tin polymetallic deposits in the area. | Mao Jingwen Institute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijing Fei Zhenbi | 1989 | Acta Geologica Sinica(English Edition)1989，63，2： | 3 |
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