黔北地区下三叠统茅草铺组白云岩成因
Petroleum Geology & Oilfield Development in Daqing（2018）
Abstract
黔北地区下三叠统茅草铺组发育泥粉晶白云岩和砂屑白云岩,但其成因机理鲜有研究.基于古地理环境和岩石学特征分析,开展了碳氧同位素、微量元素和阴极发光等地球化学研究.结果表明:泥粉晶白云岩和砂屑白云岩均为低温成因,泥粉晶白云岩具有负的δ18O值和正的δ13C值,Sr和Na含量较高,发育石膏假晶,形成于高盐度的强烈蒸发潮坪或瀉湖环境,是准同生白云化成因;砂屑白云岩具有负的δ18O值和负的δ13C值,具有最低的Sr和Na含量,砂屑为泥品结构,磨圆差—中等,大多杂乱排列,亮晶方解石或白云石胶结,为先期沉积的准同生白云岩经搬运再次沉积而成;部分样品Sr含量异常,表明此类白云岩叠加了埋藏白云化作用.
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Key words
dolomite origin,geochemical characteristic,Lower Triassic,Maocaopu Formation,North Guizhou
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