栾晓聪,吴荣昌,王光旭,魏鑫,詹仁斌

• 1:中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室
• 2:中国科学院生物演化与环境卓越创新中心
• 3:北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室
• 4:中国科学院大学

摘要(Abstract)：

中奥陶统铁质鲕粒(简称铁鲕)沉积在华南上扬子区广泛分布,但迄今仅有零星报道,缺乏系统的研究。本文在前人工作的基础上,通过开展广泛的野外勘察和分析测试,全面阐述了这套铁鲕沉积的分布规律、发育特点及其控制因素与环境背景。该铁鲕沉积主要见于华南上扬子区中—上奥陶统华弹组、十字铺组和牯牛潭组,在川滇交界至川西南以鲕铁岩、砂页岩、灰岩形式产出,在滇东北—川南—黔北及陕南—川北多为灰岩,含铁矿物主要包括赤铁矿、鲕绿泥石、针铁矿等。铁鲕沉积的时代主要为达瑞威尔中—晚期,在多数地点发育1～2层,个别可见3层,可归属于两期。铁鲕的形成主要受沉积或早期成岩环境的影响或控制,如区域构造运动、古海洋水物理化学条件、微生物活动等。华南的铁质核形石、叠层石和海相红层等独特沉积记录同样发育在大致同期的台地上,共同构成一套含铁质“时征相”。进一步系统研究这套铁鲕沉积,将为全面认识铁质沉积、深入理解华南乃至全球奥陶纪古地理与古环境演变、探索地史时期重大事件等奠定基础。

关键词(KeyWords)： 铁质鲕粒;环境变化;时征相;华南;奥陶纪

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(42102130、41972011);; 中国科学院战略性先导科技专项(XDB26000000);; 江苏省自然科学基金(BK20191101);; 现代古生物学和地层学国家重点实验室共同资助

作者(Author): 栾晓聪,吴荣昌,王光旭,魏鑫,詹仁斌

DOI: 10.19839/j.cnki.dcxzz.2021.0043

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