藏南古堆地区下侏罗统日当组地球化学特征及沉积环境分析

Geochemical features and sedimentary environment the Lower Jurassic Ridang formation in the Gudui area,southern Tibet

为研究藏南下侏罗统日当组地球化学特征及沉积环境,通过采集地球化学样品,分析了古堆地区该组的地球化学特征。并且认为日当组一段为次深海盆地相的沉积特点,沉积旋回总体表现为一退积序列;日当组二段为低能静水欠补偿饥饿段沉积,总体反映为高水位期陆棚边缘盆地相。

In order to study the geochemical features and sedimentary environment of the Lower Jurassic Ridang formation in southern Tibet,the geochemical features of this formation in Gudui area were analyzed by collecting samples.It was considered that the first member of the Ridang formation had the sedimentary features of the subdeep basin facies and the sedimentary cycle was generally a regressive sequence,while the second member of the Ridang formation is the low energy still water undercompensated starved sediment,which was generally reflected as the continental shelf marginal basin facies in the high water level stage.