| 日喀则残留型弧前盆地的构造与沉积演化 |
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| 引用本文： | 郝杰,李日俊.日喀则残留型弧前盆地的构造与沉积演化[J].中国科学院研究生院学报,1997(1). |
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| 作者姓名： | 郝杰 李日俊 |
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| 作者单位： | 中国科技大学研究生院，中国科学院地质研究所 (北京)82级硕士研究生 85级博士研究生，北京 100029 |
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| 基金项目： | 中国科学院地质研究所所长基金支持课题 |
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| 摘 要： | 发育在冈底斯岩浆弧与雅鲁藏布江蛇绿岩带之间的日喀则群是残留型弧前盆地沉积。盆地的南部基底和前缘脊由雅鲁藏布江蛇绿岩带构成。盆地形成初期是一套蛇绿质碎屑沉积即冲堆组,沉积物源主要来自盆地南部前缘脊;盆地发育中期主要是一套浊流成因的深海扇,沉积物源主要来自盆地北部的岩浆弧,少量来自前缘脊蛇绿岩;盆地发育晚期为一套浅海-滨海沉积,物源来自北部岩浆弧。至始新世末期或渐新世早期,盆地结束沉积。
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| 关 键 词： | 日喀则群 残留型弧前盆地 俯冲带上叠型蛇绿岩 演化 |
Tectonic and Sedimentary Evolution of the Xigaze Remnant-Type Forearc Basin |
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| Hao Jie Li Yuejun.Tectonic and Sedimentary Evolution of the Xigaze Remnant-Type Forearc Basin[J].Journal of the Graduate School of the Chinese Academy of Sciences,1997(1). |
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| Authors: | Hao Jie Li Yuejun |
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| Abstract: | Xigaze Group, which developed in the Xigaze forearc basin between Gangdise Granites and Tsangpo Ophiolite in the Himalayan Orogenic Belt. was deposited on Tsangpo Ophiolite at the southern part of the basin, and was deposited on Gangdise Granites at the northern margin of the basin. We think that the southern basement and fore-ridge of the basin was composed of the Tsangpo super-subduction zone ophiolite, so the basin is classed under the Remnant-type forearc basin. During the early period of formation of the basin (K13), the ophiolitifeous slide deposit and radiolarian chert were developed in the basin, the sedimenst came from the fore-rigde; During the middle period (K21), the turbidite fan was well developed in the basin, the sediments came mainly from the northern Gangdise Arc; During the late period (K22-E2) - the basin evolved into littoral environment, and terrestrial deposit was developed in the northern margin of the basin and sorthen side of the fore-ridge. The collision between Indian Plate and Asian Plate probably occurred in Oligocene. |
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| Keywords: | Xigaze group remnant-type forearc basin super-subduction zone ophiolite evolution |
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