OALib Journal期刊
ISSN: 2333-9721
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塔北隆起三叠系-新近系的砂岩和粉砂岩中粘土矿物的分布特征及影响因素
DOI: 10.13232/j.cnki.jnju.2015.06.023, PP. 1256-1267
Keywords: 塔北隆起,粘土矿物组合,岩石地球化学,构造地质环境,沉积物源,古环境
Abstract:
利用x射线衍射和电子探针实验方法来研究塔北隆起三叠系-新近系的砂岩和粉砂岩中粘土矿物的分布特征及绿泥石的成分,获得了以下认识:(1)研究区存在三种粘土矿物组合类型:r0i/s+i+chl、ka+chl+i、i+chl。绿泥石多型为ⅱb型,根据绿泥石成分分为辉绿泥石和铁镁绿泥石。(2)研究区粘土矿物的纵向分布及绿泥石成分的变化与成岩作用的关系不是非常密切。利用岩石地球化学方法,结合区域地质构造演变史,获得影响本区粘土矿物组合纵向分布特征的主要因素是构造地质环境、沉积物源和古环境。研究结果显示,当层位处在构造活动强烈,物源区未经历强烈风化,沉积物为快速堆积,古气候为半干旱至干旱的环境时,形成的粘土矿物组合主要为r0i/s+i+chl;当层位处在构造地质环境稳定,物源区强烈风化,沉积物经历了一定的搬运后再沉积,并为湿润的古气候时,形成的粘土矿物组合主要为ka+chl+i。
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