| 岳林浩,王继春.内蒙古平安地地区元古代蛇绿混杂岩岩石地球化学特征及构造意义[J].地质找矿论丛,2022,37(4):457-468 |
| 内蒙古平安地地区元古代蛇绿混杂岩岩石地球化学特征及构造意义 |
| Petrogeochemical characteristics and tectonic significance of Proterozoic ophiolitic melange in Pingandi area, Inner Mongolia |
| 投稿时间：2022-04-08 |
| DOI：10.6053/j.issn.1001-1412.2022.04.008 |
| 中文关键词: 蛇绿岩 岩石地球化学 华北板块 元古代 内蒙古 |
| 英文关键词:ophiolite petrogeochemistry North China plate Proterozoic Inner Mongolia |
| 基金项目:受内蒙古自然科学基金项目(编号:2019BS04002)、中国地质调查局项目“内蒙古锡林郭勒盟朱日和等三幅1∶5万地质矿产综合调查”(编号:12120115030401)、松辽盆地西缘扎赉特—巴林左旗区域地质调查项目(编号:DD20190039)及内蒙古地勘基金项目“内蒙古扎兰屯市二道河铅锌银多金属矿成矿条件、成因研究及外围找矿预测(编号:2019-KY01)”联合资助。 |
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| 中文摘要: |
| 平安地蛇绿混杂岩是笔者在"内蒙古锡林郭勒盟朱日和等三幅1∶5万地质矿产综合调查"工作中识别出的一套混杂岩。该混杂岩位于兴蒙造山带南缘,其地处华北板块演化的关键部位。本文对其进行了岩石类型、岩石地球化学及同位素年代学测试分析,结果表明:该套混杂岩主要由蛇绿岩和洋岛海山岩等组成;根据获得的LA-MC-ICP-MS锆石U-Pb年龄数据及锆石特征,主体岩性形成于中元古代或早中元古代。推测该套混杂岩记录了元古代哥伦比亚超大陆聚合过程中的洋陆转化事件,属于华北克拉通的古元古代变质基底。 |
| 英文摘要: |
| Pingandi ophiolitic melange is recognized by the authors during completion of the integrated geology and mineral resources survey at scale 1∶50000 for Xilingele, Zhurihe etc. the three sheets. It is located at South margin of Xingmeng orogenic belt. The marginal area is the key point for evolution of North China block. This paper deals with its rock type, petrogeochemistry and isotropic chronology. The melange consists mainly of ophiolite and rocks of seamount. U-Pb age of LA-MC-ICP-MS of zircon and the zircon characteristics show that the main lithologies are formed in Middle Proterozoic and Early Middle Proterozoic periods. The melange belongs to Paleoproterozoic metamorphic basement of north China craton, may record ocean-land transformation event during polymerization of Proterozoic Columbia supercontinent. |
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