云南罗平上石坎剖面中三叠世层序地层及沉积相分析MIDDLE TRIASSIC SEQUENCE-STRATIGRAPHY AND SEDIMENTARY FACIES ANALYSIS AT THE SHANGSHIKAN SECTION OF LUOPING COUNTY,YUNNAN PROVINCE
白建科,张启跃,黄金元,张克信,周长勇,吕涛,胡世学
摘要(Abstract)：
在云南罗平上石坎剖面,产罗平生物群的中三叠统关岭组二段出露良好,为灰黑色纹层状含硅质结核、硅质条带泥晶灰岩和具滑塌构造、包卷层理等沉积构造为典型沉积。根据层序地层和沉积相分析,在上石坎剖面划分出2个三级沉积层序(SQ1和SQ2),相对海平面经历了2次升与降的过程,SQ1表现为局限台地—开阔台地—台内盆地—开阔台地的演变过程;SQ2表现为开阔台地—台内盆地—开阔台地—局限的蒸发台地的演变过程。SQ1和SQ2的台内盆地内发育凝缩段,是鱼类和海生爬行类脊椎动物保存的最佳层位。
关键词(KeyWords)： 层序地层;沉积相;关岭组;中三叠统;上石坎剖面;罗平;云南
基金项目(Foundation): 中国区域地质调查项目(No.1212010610211);; 国家自然科学基金(No.40621002,400830212)资助成果
作者(Author): 白建科,张启跃,黄金元,张克信,周长勇,吕涛,胡世学
DOI: 10.19839/j.cnki.dcxzz.2011.03.005
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