| 摘要: |
| 赤布张错地区中侏罗统十分发育,最大沉积厚度达6311m,包括雀莫错组、布曲组、夏里组、索瓦组和雪山组等5个岩石地层单元。根据所含丰富的双壳类、菊石、腕足类等化石,将它们划归中侏罗统(巴柔阶至卡洛夫阶)。沉积盆地的性质、早期的地貌格局和同沉积断裂活动可能是导致该地区中侏罗统厚度巨大、横向变化大的主要原因。 |
| 关键词: 赤布张错 中侏罗世 沉积环境 双壳类 青海南部 |
| DOI： |
| 附件 |
| 投稿时间：2005-09-05修订日期：2006-04-29 |
| 基金项目:中国地质调查局“1:25万赤布张错幅区域地质调查”(20001300009121)。 |
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| Middle Jurassic depositional environments and bivalve fossils in the Chibuzhang Lake area,southern Qinghai |
| DUAN Qi-fa, WANG Jian-xiong, YAO Hua-zhou, NIU Zhi-jun, ZHANG Ren-jie |
| (Yichang Institute of Geology and Mineral Resources, Yichang 443003, Hubei, China) |
| Abstract: |
| The Middle Jurassic strata with a maximum sediments thickness up to 6311 m in the Chibuzhang Lake area,southern Qinghai are well developed and divisible into Qoimaco,Biqu,Gyari,Sogwa and Xueshan Formations on the basis of the fossils of bivalves,ammonites and brachiopods.The tremendous thickness and horizontal variations of the Middle Jurassic strata in this area may result from the nature of the basin,early geomorphic framework and syn-sedimentary faulting. |
| Key words: Chibuzhang Lake Middle Jurassic depositional environment bivalves southern Qinghai |
