| 左海洋,赵亮亮,彭师华,王雷,杨光,赵永辉,王彦新.西秦岭泽库毛海-夏德日花岗岩年代学、地球化学及构造环境分析[J].矿产勘查,2021,12(11):2215-2223 |
| 西秦岭泽库毛海-夏德日花岗岩年代学、地球化学及构造环境分析 |
| Chronology, geochemistry and tectonic environment analysis of the Mohai-Xiaderi granite in Zeku region, South Qinling |
| 投稿时间：2020-11-21 |
| DOI： |
| 中文关键词: 毛海-夏德日花岗岩体 锆石U-Pb年龄 构造环境 泽库 |
| 英文关键词: Mohai-Xiaderi granite U-Pb dating tectonic environment Zeku |
| 基金项目:本文受中国地质调查局项目《青海省泽库县萨卡拉卡地区I47E004021、I47E004022、I47E005021、I47E005022、I47E006022五幅1∶5万区域地质矿产调查》(1212011221140)资助。 |
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| 中文摘要: |
| 研究区位于同德-泽库弧后盆地，岩浆活动以印支期中酸性岩浆岩为主。本研究利用LA-ICP-MS锆石U-Pb同位素测年方法获得毛海-夏德日花岗岩体年龄(236.39±0.96) Ma。该岩体具有富碱、富钾的特征，为高钾钙碱性系列；富集大离子亲石元素和轻稀土元素。综合前人研究成果，认为岩体属于I型花岗岩，继承了早期岛弧火山岩的部分特征，与阿尼玛卿-勉略残余海盆在晚古生代末期向北俯冲消减有关。 |
| 英文摘要: |
| The study area is located in the Tongde-Zekuback-arc basin, among which indosinian intermediate-acid rocks are widespread. Zircon LA-ICP-MS U-Pb isotope dating for Maohai-Xiaderi granite intrusion yields an age of (236.39±0.96) Ma. The granite is characteristics of alkali and potassium rich, belonging to high potassium calcium alkaline. In addition, the Maohai-Xiaderi granite is enriched in large ion lithophilic elements and light rare earth elements. Based on the previous researches, we proposed that this intrusion belongs to I-type granite, inheriting some materials that derived from early island arc volcanic rocks. The formation of the Maohai-Shadege granite was closely associated with the northward subduction of Animaqin-Mianlueocean at the end of the late Paleozoic. |
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