| 通安-小关河元古代碰撞缝合线的发现及其地质意义 |
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| 引用本文： | 李继亮,张绍宗.通安-小关河元古代碰撞缝合线的发现及其地质意义[J].地质科学,1987,0(1):81-85. |
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| 作者姓名： | 李继亮 张绍宗 |
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| 作者单位： | 中国科学院地质研究所 |
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| 摘 要： | 在四川南部地区发现了从通安延伸到小关河的蛇绿混杂带,它可能代表了元古代的一条碰撞缝合带。这条东西延伸的缝合带的证据是:1.残留洋壳经消减、冲断形成的蛇绿混杂带;2.该带两侧的地层有明显的差异;3.强烈变形的冲断褶皱带;4.变质程度在两侧有明显的不同;5.有类似于阿巴拉契亚山带的夹心糕式模式,依次为南部的被动边缘的俯冲表壳岩系、中间的蛇绿混杂带和北部的上冲基底。上述证据说明通安-小关河蛇绿混杂带代表了两个陆壳地质体的碰撞缝合带,碰撞事件的年龄大约为距今1000Ma。
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| 关 键 词： | 元古代 蛇绿混杂带 碰撞缝合线 |
| 收稿时间： | 1984-09-01 |
| 修稿时间： | 1984-09-01; |
THE DISCOVERY OF A PROTEROZOIG COLLISION SUTURE FROM TONGAN TO XIAOGUANHE AND ITS GEOLOGICAL SIGNIFICANCE |
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| Li Jiliang Zhang Shaozong.THE DISCOVERY OF A PROTEROZOIG COLLISION SUTURE FROM TONGAN TO XIAOGUANHE AND ITS GEOLOGICAL SIGNIFICANCE[J].Chinese Journal of Geology,1987,0(1):81-85. |
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| Authors: | Li Jiliang Zhang Shaozong |
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| Institution: | Institute of Geology, Academia Sinica, Beijing |
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| Abstract: | In southern Sichuan, an ophiolite melange extending from Tongan to Xiaoguanhe has been recognized. It may represent a Proterozoic collision suture. There are observation evidences for the E-W trend suture as following: (1) an ophiolitic melange belt resulted from subducted and overthrusted residual oceanic crust; (2) the significant differences in stratigraphy between the south and north sides of the ophiolitic melange belt; (3) strongly deformed thrust-fold belt; (4) the differences in metamorphic grades between the south and north sides, and (5) a sandwich orogenic model similar to Appalachian mountain belt, consisting of an underthrust supercrustal rock series in the southern part, an ophiolitic melange belt in the central pert and an overthrust basement in the northern part, The evidences mentioned above suggest that Tongan-Xiaoguanhe ophiolitic melange may represent a collision suture between the two terranes with continental crust and the age of the collision event is about 1000Ma. |
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| Keywords: | ophiolitic melange Proterozoic collision suture thrust old sandwich mo-del southren Sichuan |
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