| 新疆索尔库都克铜钼矿床含矿粗面英安斑岩岩石学、地球化学特征与岩石成因 |
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| 引用本文： | 赵路通,王京彬,王玉往,丁汝福,龙灵利,邹滔,石煜,高一菡.新疆索尔库都克铜钼矿床含矿粗面英安斑岩岩石学、地球化学特征与岩石成因[J].地球化学,2014(1):88-99. |
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| 作者姓名： | 赵路通 王京彬 王玉往 丁汝福 龙灵利 邹滔 石煜 高一菡 |
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| 作者单位： | 昆明理工大学国土资源工程学院;北京矿产地质研究院;中国科学院矿产资源研究重点实验室;中国科学院地质与地球物理研究所; |
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| 基金项目： | 国家自然科学基金(41202064,41030424);国家重点基础研究发展计划项目(2014CB440803,2007CB411304) |
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| 摘 要： | 位于东准噶尔北缘的索尔库都克铜钼矿床，一直以来被认为属于一个与辉石闪长玢岩有关的层控夕卡岩型矿床。笔者在矿区露天采场及勘探钻孔调查中发现该矿床的成矿母岩可能为粗面英安斑岩，粗面英安斑岩多发育脉状和浸染状铜、钼矿化，且由浅部到深部热液活动逐渐加强，显示其与成矿关系密切：粗面英安斑岩的K2O＋N2O为9．38％～10．3％、K2O／Na2O为2．63～3．17、A／CNK为0．89～0．98，属准铝质、富钾碱性岩系列，为I型花岗岩：微量元素方面，相对富集Rb、Ba和K等大离子亲石元素和强不相容元素（如U和Xh），有明显Sr、Ti、Nb和Ta的亏损，与岛弧型花岗岩的特征一致：粗面英安斑岩的（87Sr／86Sr）i为0．70100～0．70384，（143Nd／144Nd）j为0．512387～0．512436，CNd（t）为（＋4．8～＋5．8），T2DM为663～741Ma，显示其可能源于地幔楔部分熔融。
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| 关 键 词： | 粗面英安斑岩 I型花岗岩 索尔库都克 东准噶尔 |
Petrology,geochemistry and petrogenesis of the ore-bearing trachydacite porphyry from the Suoerkuduke Cu-Mo deposit,Xinjiang, NW China |
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| ZHAO Lu-tong;WANG Jing-bin;WANG Yu-wang;DING Ru-fu;LONG Ling-li;ZOU Tao;SHI Yu;GAO Yi-han.Petrology,geochemistry and petrogenesis of the ore-bearing trachydacite porphyry from the Suoerkuduke Cu-Mo deposit,Xinjiang, NW China[J].Geochimica,2014(1):88-99. |
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| Authors: | ZHAO Lu-tong;WANG Jing-bin;WANG Yu-wang;DING Ru-fu;LONG Ling-li;ZOU Tao;SHI Yu;GAO Yi-han |
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| Institution: | ZHAO Lu-tong;WANG Jing-bin;WANG Yu-wang;DING Ru-fu;LONG Ling-li;ZOU Tao;SHI Yu;GAO Yi-han;Faculty of Land Resources Engineering, Kunming University of Science and Technology;Beijing Institute of Geology for Mineral Resources;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, CAS; |
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| Abstract: | The Suoerkuduke Cu-Mo deposit is located in the northeastern margin of East Junggar. It was traditionally regarded as a stratabound skarn deposit associated with pyroxene andesite porphyrite. Based on investigation of open-pit and the exploration borehole in the mining area, this paper considers that the host rock of this deposit may be the trachydacite porphyry, evidenced by that the trachydacite porphyry developed veinlet copper and molybdenum mineralization, and the hydrothermal activity became much stronger from the shallow to deep. The K20＋Na20 content in fresh trachydacite porphyry reaches 9.38%-10.3%, the K20/Na20 value is 2.63-3.17, and its A/CNK value is 0.91-1.04, indicating that the trachydacite porphyry belongs to the metaluminous and high-K calc-alkaline rock series being affinity of ＂I＂ type granite. The geochemistry of enriching in large-ion lithophile elements （LILE, such as Rb, Ba and K） and strong incompatible elements （such as U, and Th）, relatively depleting in high field strength elements （HFSE, such as Sr, Nb, Ta and Ti） suggest that the trachydacite porphyry may display a characteristics of the arc magma. The isotope characterized by （S7Sr/S6Sr）i ratio of 0.70100-0.70384, （143Nd/144Nd）irati of 0.512387-0.512436, end（t） value of ＋4.8- ＋5.8, and young Nd two-stage model age of 663-741 Ma, indicate that the trachydacite porphyry may be derived from the partial melting of mantle wedge. |
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| Keywords: | trachydacite porphyry I-type granite Suoerkuduke East Junggar |
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