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沉积学报  2015 

米仓山南缘中志留统罗惹坪组风暴岩沉积特征及其意义

DOI: 10.14027/j.cnki.cjxb.2015.02.002, PP. 226-231

Keywords: 风暴沉积,沉积序列,中志留统,罗惹坪组

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Abstract:

通过野外剖面实测和镜下薄片观察,笔者发现米仓山南缘志留系罗惹坪组顶部发育多套风暴沉积,典型的风暴沉积构造,包括侵蚀构造、砾屑结构、粒序层理等发育,岩性主要为灰绿色泥页岩、浅灰色或灰色微晶灰岩和生屑微晶灰岩。该区风暴岩发育3种风暴沉积序列,且具有一定的继承性,为远源型,沉积环境为浅水陆棚;风暴岩的发现解释了该区罗惹坪组生物灰岩透镜体的成因,为区域地层等时对比提供了新的标尺,对于研究区古地理、古气候以及古扬子海盆演化提供了依据。研究表明南江地区在志留系罗惹坪组晚期沉积时,曾处于风暴频发低纬度地区。

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