刘俊杰,郑全锋,罗茂,张予杰,张华,徐海鹏,琚琦,张以春

• 1:现代古生物学和地层学国家重点实验室
• 2:中国科学院南京地质古生物研究所
• 3:中国科学院大学
• 4:中国地质调查局成都地质调查中心(西南地质科技创新中心)

摘要(Abstract)：

拉萨地块作为组成青藏高原的众多板块之一,其古地理演化是学术界关注的焦点,识别拉萨地块晚古生代冰期—冰后期地层和沉积的变化对于了解和认识拉萨地块古环境变化有重要的指示意义。前人对于拉萨地块下二叠统沉积环境研究较少,且主要集中在拉萨地块中部。本文通过详细测制西藏拉萨地块狮泉河地区羊尾山剖面下二叠统,依据邓哈姆碳酸盐岩分类方案及威尔逊碳酸盐岩相带划分模式,查明了昂杰组上部至下拉组底部的岩石类型、组合及沉积环境。昂杰组以生物碎屑灰岩夹碎屑岩沉积为特征,代表了晚古生代大冰期衰退后的碳酸盐岩中缓坡下部环境;下拉组底部岩性以富含生物碎屑的泥粒灰岩为特征,沉积环境为碳酸盐岩中缓坡上部环境。研究认为,狮泉河地区与拉萨地块中部下二叠统的沉积背景大体相同,表现出由碳酸盐岩中缓坡下部逐渐向碳酸盐岩中缓坡上部过渡的特征,以及海平面变浅的趋势,同时指示拉萨地块早二叠世时是一个稳定的地块。

关键词(KeyWords)： 沉积特征;沉积环境;早二叠世;狮泉河;西藏拉萨地块

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(91855205);; 第二次青藏高原综合科学考察研究(2019QZKK0706);; 中国科学院战略性先导专项(XDB26000000)共同资助

作者(Author): 刘俊杰,郑全锋,罗茂,张予杰,张华,徐海鹏,琚琦,张以春

DOI: 10.19839/j.cnki.dcxzz.2023.0018

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