| 高攀,张有军,刘战鹏,董帅,王纪昆,王鹏飞,柳海华.西昆仑卧龙岗二长花岗斑岩地球化学特征及年代学研究[J].矿产勘查,2023,14(7):1001-1010 |
| 西昆仑卧龙岗二长花岗斑岩地球化学特征及年代学研究 |
| Geochemal characteristics and geo chronology of monzogranitic porphyry in Wolongang， West Kunlun |
| 投稿时间：2022-04-03 修订日期：2022-05-22 |
| DOI：10.20008/j.kckc.202307001 |
| 中文关键词: 卧龙岗二长花岗斑岩 岩石地球化学特征 锆石U-Pb同位素定年 西昆仑 |
| 英文关键词: Wolongang monzonite granitic geochemical characteristics of rocks zircon U-Pb isotopic dating West Kunlun |
| 基金项目:本文受天津市规划和自然资源局科研项目（ML2019-HP-F162）及天津华北地质勘查局科研项目（HK2022-B2）联合资助。 |
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| 中文摘要: |
| 形成于印支期的酸性侵入岩与新疆西昆仑地区成矿关系密切。卧龙岗二长花岗斑岩位于黑石北湖—三道河子岩浆岩带中段，岩体周边发育多种有色金属矿床。本研究针对二长花岗斑岩，采用LA-MC-ICP-MS方法进行锆石U-Pb同位素定年，结果为（239.47±0.78）Ma～（222.36±0.64）Ma，指示岩体形成于中—晚三叠世。二长花岗斑岩属于准铝质—过铝质、高钾钙碱性—钾玄岩系列。岩石全碱含量较高，里特曼指数变化范围较小。相对富集Rb、Th等大离子亲石元素，亏损Nb、Ta等高场强元素，具有弱的Eu异常，且相对亏损Ba、Sr。分析认为，卧龙岗二长花岗斑岩形成于中—晚三叠世同碰撞构造背景下，源岩为壳源沉积物，经过部分熔融、结晶形成花岗岩，为陆壳改造型花岗岩（S型花岗岩）。 |
| 英文摘要: |
| The acidic intrusive rocks formed in the Indosinian age are closely related to the mineralization in the West Kunlun area of Xinjiang. Wollongong monzonite granite porphyry is located in the middle part of the Black rock Beichu-Sandaohezi magmatic rock belt， and a variety of non-ferrous metal deposits are developed around the rock. In this study， LA-MC-ICP-MS method was used to date zircon U-Pb isotopes from （239.47±0.78） Ma to （222.36±0.64） Ma， indicating that the pluton was formed in the Middle to Late Triassic. Monzonite granite porphyry belongs to the quasi - peraluminous， high potassium calc - alkali - potassium basalt series. The total alkali content of rocks is higher， and the variation range of Rittman index is smaller. It is relatively enriched in large ion lithophile elements such as Rb and Th， deficient in high field strength elements such as Nb and Ta， with weak Eu anomaly， and relatively deficient in Ba and Sr. It is concluded that the monzonitic granite porphyry in Wollongong was formed in the middle to Late Triassic collisional tectonic setting. The source rock is shell-derived sediment， and the granite is formed by partial melting and crystallization， which is the continental crust modified granite （S-type granite）. |
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