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贵州台江革一黔东统杷榔组沉积环境初探

ISSN号：0371-5736
期刊名称：《地质论评》
时间：0
分类：P512.2[天文地球—地质学]
作者机构：[1]贵州大学资源与环境工程学院,贵阳550003, [2]现代古生物学和地层学国家重点实验室（中国科学院南京地质古生物研究所）,南京210008, [3]中国石油塔里木油田公司开发事业部,新疆库尔勒841000
相关基金：国家自然科学基金（编号40762001）; 贵州大学研究生创新基金（校研理工2010051）;贵州大学引进人才基金（贵大人基金字2010021）; 现代古生物及地层学国家重点实验室（中国科学院南京地质古生物研究所）基金（编号113111）; 贵州省国际科技合作重点项目[黔科合外“G”字2008（700110）]; 贵州省科技特别基金（黔科机字200724004）; 深圳仙湖植物园古生物博物馆基金资助项目的成果

作者：达扬[1,2], 彭进[1], 赵元龙[1], 马海涛[1], 谷雨[3]

关键词：杷榔组, 杷榔动物群, 沉积环境, 寒武系, 贵州台江革一, Balang Formation, Balang Fauna, Sedimentary environment, Cambrian, Geyi, Taijiang, Eastern Guizhou, China

中文摘要：

贵州台江革一杷榔组出露完整、富含化石,其中—上部层位产有类群组合多样的杷榔动物群,为杷榔动物群的一个重要产地。本文通过详细的野外观察,结合生物化石保存情况及岩石薄片的分析结果,对革一杷榔组沉积环境及其海平面变化规律进行了综合分析,认为革一杷榔组的沉积位于盐度正常、较深水的陆棚环境,生物生活环境多为氧化—弱氧化环境,富含化石的层位经历了快速沉积事件,整组的沉积由底向上海水经历了由深至浅的变化过程,但其间经历2次小的波动,水体变深后变浅,并出现还原—氧化界面的波动。

英文摘要：

The Balang Formation in Geyi section,Taijiang County,Guizhou Province,exposed completely and contained abundant fossils.The Balang Fauna which yielded in the middle—upper parts of the Balang Formation in Geyi section is diverse in composition.Therefore the section is an important locality of the Balang Fauna.Based on detailed investigation of field work,the characteristics of fossil preservation in different beds and analysis of thin section of rock samples from Geyi section,writers synthesized these data to analyze sedimentary characteristics and sea-level changes of the Balang Formation in Geyi.The conclusion was that the Balang Formation in Geyi was deposited in an environment of deep-water shelf under normal salinity.Organisms lived in an oxidizing environment—low-oxidizing environment and beds which contained abundant fossils undergone rapid deposition events.In general,seawater depth changed from deep to shallow during the deposition period of Balang Formation,including two obvious wave influences,which seawater depth deepened firstly then shallowed and the reduction—oxidation interface changed on sea-floor.

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