黔南克脚二叠纪末生物群特征及其地质意义

发布时间：2018-04-10 12:41

本文选题：生物组合 + 沉积环境　；参考：《地质科技情报》2017年06期

【摘要】：贵州惠水克脚剖面是南盘江盆地北缘二叠系-三叠系界线剖面,地层连续,产不同门类的化石,对古生代-中生代之交黔南古地理和生物演化研究具有重要意义。剖面主要包括上二叠统大隆组和下三叠统大冶组下部。大隆组岩性主要为硅质泥岩、钙质泥岩和炭质页岩,夹火山灰黏土岩与薄层硅质灰岩,泥岩发育水平层理。大隆组主要产游泳生物菊石、浮游生物放射虫,另外产小个体腕足类、双壳类和腹足类等,少数层位含植物化石。大冶组下部主要为薄层泥质灰岩夹钙质泥岩。通过岩性、古生物组合、沉积构造等分析,认为本剖面在二叠纪末为离古陆较近的深水沉积。
[Abstract]:The Huishui Kejie section is a Permian-Triassic boundary section in the northern margin of the Nanpanjiang Basin, with continuous strata and fossils of different families, which is of great significance to the study of Paleozoic and Mesozoic paleogeography and biological evolution in southern Guizhou.The section mainly includes Dalong formation of Upper Permian and lower part of Daye formation of Lower Triassic.The lithology of Dalong formation is mainly composed of siliceous mudstone, calcareous mudstone and carbonaceous shale, volcanic clay rock and thin layer siliceous limestone, and mudstone develops horizontal bedding.The Dalong formation is mainly composed of chrysanthemum, phytoplankton radiolaria, small individual brachiopods, bivalves and gastropods, and a few layers contain fossil plants.The lower part of Daye formation is mainly composed of thin layer mudstone and calcareous mudstone.Through the analysis of lithology, paleontological assemblage and sedimentary structure, it is concluded that this section is a deep-water deposit near paleocontinent at the end of Permian.
【作者单位】：中国地质大学地球科学学院;中国地质大学生物地质与环境地质国家重点实验室;
【基金】：国家自然科学基金项目(41372030;41772016) 中国地质调查局项目(1212011220529)
【分类号】：P534.46;Q911

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