藏东北巴青县江绵乡上三叠统东达村组和“甲丕拉组”沉积特征及其意义
摘要
在藏北巴青县江绵乡一带发现与滇西他念他翁山、藏东昌都地区相似的上三叠统东达村组和“甲丕拉组”。东达村组自下而上为冲积扇泥石流沉积、无障壁碎屑滨岸沉积和浅水碳酸盐台地潮坪沉积。“甲丕拉组”为干热环境下的碳酸盐台地潮坪(包括潮汐水道砂)沉积、障壁砂坝沉积和滨外粉砂、泥沉积,其中有地震事件记录。两组总体上构成一套向上变深的海侵序列。两组沉积特征新资料为认识藏东北地区印支运动阶段本区“构造域”的转换提供了重要信息。
The Upper Triassic Dongdacun Formation and "Jiapila Formation" similar to those in the Taniantaweng Mountains, western Yunnan, and the Qamdo area, eastern Tibet, have been found for the first time in the Jiangmianxiang area, Baqên County, northern Tibet. The Dongdacun Formation consists in ascending order of alluvial fan debris flow deposits, barrier-free clastic littoral deposits and shallow-water carbonate platform tidal-flat deposits. The "Jiapila Formation" consists of carbonate platform tidal-flat (including tidal channel sand) deposits, barrier bar deposits and mud deposits formed in a hot environment, which contain records of seismic events. The two formations make up an upward-deepening transgressive sequence. The new data of the sedimentary characteristics of the two formations provide important information for the rarely known tectonic-paleogeographic environment occurring in the Indosinian movement in northern Tibet.
The Upper Triassic Dongdacun Formation and "Jiapila Formation" similar to those in the Taniantaweng Mountains, western Yunnan, and the Qamdo area, eastern Tibet, have been found for the first time in the Jiangmianxiang area, Baqên County, northern Tibet. The Dongdacun Formation consists in ascending order of alluvial fan debris flow deposits, barrier-free clastic littoral deposits and shallow-water carbonate platform tidal-flat deposits. The "Jiapila Formation" consists of carbonate platform tidal-flat (including tidal channel sand) deposits, barrier bar deposits and mud deposits formed in a hot environment, which contain records of seismic events. The two formations make up an upward-deepening transgressive sequence. The new data of the sedimentary characteristics of the two formations provide important information for the rarely known tectonic-paleogeographic environment occurring in the Indosinian movement in northern Tibet.
引文
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[4]青海省地质矿产局.青海省岩石地层[M].武汉:中国地质大学出版社,1997.242-269.
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[6]王成善,伊海生.西藏羌塘盆地地质]化与油气远景评价[M].北京:地质出版社,2001.83-93.
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[8]周志广,刘文灿,梁定益.藏南康马奥陶系及其底砾岩的发现并初论喜马拉雅沉积盖层与统一变质基底的关系[J].地质通报,2004,23(7):655-663.
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[14]姚华舟,段其发,牛志军,等.赤布张错幅地质调查新成果及主要进展[J].地质通报,2004,23(5-6):530-538.
[15]王国灿,贾春兴,朱云海,等.阿拉克湖幅地质调查新成果及主要进展[J].地质通报,2004,23(5-6):549-554.
[16]任纪舜,肖黎薇.1∶25万地质填图进一步揭开了青藏高原大地构造的神秘面纱[J].地质通报,2004,23(1):1-11.
[17]王建平.西藏他念他翁山链北部花岗岩与特提斯洋]化[A].见:“九五”全国地质科技重要成果论文集[C].北京:地质出版社,2000.146-149.
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[19]王建平,等.西藏东部特提斯地质[M].北京:科学出版社,2003.7-322.
[20]边千韬,沙金庚,郑祥身.西金乌兰晚二叠世—早三叠世石英砂岩及其大地构造意义[J].地球科学,1993,28(4):327-335.
[21]沙金庚.青海可可西里地区古生物[M].北京:科学出版社,1995.175.
[22]张以茀,郑祥身.青海可可西里地区地质]化[M].北京:科学出版社,1996.202.
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