| 大兴安岭中段早三叠世O型埃达克岩的发现及其大地构造意义 |
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| 引用本文： | 李世超,张凌宇,李鹏川,施璐,郑常青.大兴安岭中段早三叠世O型埃达克岩的发现及其大地构造意义[J].地球科学,2017,42(12):2117-2128. |
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| 作者姓名： | 李世超 张凌宇 李鹏川 施璐 郑常青 |
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| 作者单位： | 1.吉林大学地球科学学院, 吉林长春 130061 |
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| 基金项目： | 国家自然科学基金项目41272223国家自然科学基金项目41602209国家自然科学基金项目41472164科技部“973”项目2013CB429802国家自然科学基金项目41340024 |
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| 摘 要： | 为了研究大兴安岭中段地区早三叠世的构造背景问题，以下三叠统哈达陶勒盖组火山岩为研究对象，通过野外观测和X射线荧光光谱分析法、等离子质谱法分别对样品的主量、微量元素进行了测试.结果显示哈达陶勒盖组火山岩是一套中酸性钙碱系列岩石组合，具有高Sr、低Yb与Y和高Sr/Y的特点，为钠质（O型）埃达克岩.结合区域资料认为，古亚洲洋于早三叠世时期闭合的碰撞应力使贺根山-嫩江-黑河构造带活化，推动构造带内年轻地壳由南向北俯冲，进而推动古生代残留洋壳向更深的地幔插入，在此过程中加热并熔融、喷出地表形成哈达陶勒盖组埃达克岩，并在山间盆地沉积了湖相碎屑堆积-老龙头组.
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| 关 键 词： | 早三叠世 O型埃达克岩 哈达陶勒盖组 大兴安岭中段 地球动力学 岩石学 |
| 收稿时间： | 2017-03-18 |
Discovery and Tectonic Implications of Early Triassic O-Type Adakite in Middle of Great Xing'an Range |
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| Abstract: | In order to study the tectonic setting of the Early Triassic of the middle of the Greater Xing'an Range, the volcanic rocks of Lower Triassic Hadataolegai Formation was studied by field observation. Respectively, the main elements and trace elements were analyzed by XRF and ICP-MS. The results show that the volcanic rocks are a series of calcareous series rocks with high Sr, low Yb, Y and high Sr/Y ratios, showing geochemical features of O-type adakites are related to subduction of oceanic slab. we suggests Paleo-Asian Ocean collision along the line of Silumulon River-Changchun-Yanji which activated Hegenshan-Nenjiang-Heihe structural belt in Early Triassic. The collision pushed the young crust to subduct northward along Hegenshan-Nenjiang-Heihe line. The residual Paleozoic oceanic crust are advanced to the deeper mantle melting and then the Hadataolegai Formation adakites were formed. At the same time, the Laolongtou Formation that is lacustrine clastic sediments was deposited in the intermountain basin. |
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