| 扬子陆块北缘大洪山地区发现晋宁期造山带 |
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| 作者姓名： | 胡正祥 毛新武 田望学 李雄伟 |
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| 作者单位： | 湖北省地质调查院， 湖北 武汉 430034 |
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| 基金项目： | 中国地质调查“湖北区域地质调查与片区总结(编号:12120113012800)”项目资助。 |
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| 摘 要： | 对随南大洪山地区地质构造发展演化的认识，一直存在较大分歧。近期在该地区基础地质调查研究中取得了一些新进展:新厘定了扬子陆块北缘远安—京山地块、大洪山俯冲增生杂岩带和三里岗岩浆弧。在大洪山增生杂岩带内MORB型辉绿岩中取得820 Ma年龄资料、洋岛型玄武岩中取得817 Ma年龄资料;在三里岗岩浆弧内，于岛弧英安岩中取得841 Ma年龄资料、英云闪长岩中取得876.9 Ma年龄资料，首次在扬子陆块北缘(湖北境内)确立了晋宁期造山带的存在。
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| 关 键 词： | 扬子陆块北缘 湖北段 大洪山俯冲增生杂岩带 三里岗岩浆弧 |
| 收稿时间： | 2015-01-05 |
Discovery of the Jinningian Orogenic Belt on the Northern Margin of Yangtze Craton in Mountain Dahong |
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| Authors: | HU Zheng-xiang MAO Xin-wu TIAN Wang-xue LI Xiong-wei |
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| Institution: | Hubei Geological Survey, Wuhan,Hubei 430034, China |
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| Abstract: | Researchers still have different understandings on the geotectonic evolution of Mountain Dahong in southern Suizhou. Some progress has been made in the regional geological survey of the area recently, i.e., the Yuan’an-Jingshan block, the Mountain Dahong subduction-accretionary complex, and the Sanligang magmatic arc were identified. In the Mountain Dahong subduction-accretionary complex, MOR-type diabase and oceanic island basalt yield 820 Ma and 817 Ma, respectively. And in the Sanligang magmatic arc, arc dacite and tonalite yield 841 Ma and 876.9 Ma, respectively. These data confirmed the existence of the Jinningian orogenic belt on the northern margin of Yangtze Craton in Hubei Province for the first time. |
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| Keywords: | northern margin of Yangtze Craton Hubei Mountain Dahong subduction-accretionary complex Sanligang magmatic arc |
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