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| 1 | Age,Genesis,and Tectonic Setting of the Mo-W Mineralized Dongshanwan Granite Porphyry from the Xilamulun Metallogenic Belt,NE China显示文摘The Xilamulun molybdenum polymetallic metallogenic belt in eastern Inner Mongolia forms one of the most important Mo metallogenic belts in northeastern China. The Dongshanwan porphyry Mo-W polymetallic deposit, in the northeastern part of the Xilamulun metallogenic belt, occurs along the periphery of a granite porphyry and consists of Mo-W-Ag sulfide and oxide disseminations and veinlets in hydrothermal assemblages. LA-ICP-MS zircon U-Pb dating of the Dongshanwan granite porphyry yields a crystallization age of 142.15± 0.91 Ma, whereas molybdenite Re-Os isotopic dating model ages are of 139.9–141.5 Ma and an isochron age is of 140.5± 3.2 Ma(MSWD=1.2). The age consistency indicates that the Dongshanwan deposit was a product of Early Cretaceous magmatism. The Dongshanwan granite porphyry is a high-alkali high-potassium intrusion and has high SiO_2(75.39 wt.%–76.15 wt.%), low Al_2O_3(12 wt.%–13 wt.%), Ba, Ti, P, and Sr contents, with negative Eu anomalies. The Y/Nb ratios are comparable to those of average continental crust and island arc basalts, corresponding to type-A2 granites. Our geochemical data indicate that the granite porphyry emplaced in an Early Cretaceous post-orogenic extensional environment following Mongol-Okhotsk oceanic subduction and subsequent continental collision. | Xuebing Zhang Keyong Wang Chengyang Wang Wen Li Qi YU Yicun Wang Jianfeng Li Duo Wan Guanghuan Huang | 2017 | Journal of Earth Science2017，28，3： | 4 |
| 2 | 东昆仑东段中-晚三叠世区域岩浆-热液成矿系统显示文摘东昆仑成矿带在早中生代发生了大规模的成矿作用,形成了一系列脉状金矿床、脉状银铅锌矿床、斑岩型铜钼矿床和矽卡岩型铁多金属矿床,但这些矿床之间的成因联系尚不清楚。东昆仑东段以其多样的矿床类型为这一科学问题的研究提供了理想场所。在总结归纳东昆仑东段主要类型矿床时空分布和地质特征的基础上,通过系统分析各类矿床的成矿时代、成矿构造背景及成矿流体与物质来源,探讨它们之间的成因联系。研究结果显示,东昆仑东段各类矿床主要形成于中-晚三叠世(240~220 Ma),均是东昆仑古特提斯陆陆碰撞及后碰撞伸展作用的产物。此外,区内及外围东昆北地体中的各类矿床均具有相似的成矿流体与成矿物质来源,且与该时期广泛发育的深部岩浆作用密切相关,共同组成了一个巨型的岩浆-热液成矿系统,不同类型的矿化可能是该岩浆-热液系统不同演化阶段的产物。巴颜喀拉板块深俯冲及板块断离诱发软流圈地幔的上涌及随后的大规模岩浆-流体活动,富含金属挥发分的岩浆热液与上地壳的岩石和流体发生交代和流体混合,最终形成区内巨型的岩浆-热液成矿系统。基于该成矿系统,东昆仑东段具有寻找多类型共生矿床的潜力。 | 井国正 王晓云 张志强 何俊江 张里斌 王凤林 刘颜 石文杰 谭俊 | 2023 | 地质科技通报2023，42，1： | 2 |
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