丽水凹陷古新统微量元素地球化学特征及其地质意义

采用电感耦合等离子体质谱分析仪测试了丽水凹陷古新统泥岩样品的微量元素含量,综合分析了岩石微量元素的富集程度、组合特征以及变化规律等地球化学特征。结果表明,丽水凹陷古新统泥岩的微量元素含量及其比值变化主要与研究区物源供应和沉积成岩环境有关;丽水凹陷古新世的构造环境为活动大陆边缘;古新世早期沉积环境为干热气候环境,晚期主要为温湿—干热—温湿交替变化气候环境;古新统泥岩的母岩主要为酸性岩浆岩。

Paleocence trace element geochemistry and its geological significance in Lishui sag

An ICP MS(Inductively Coupled Plasma Mass Spectrometer) has been used to determine trace elements in Paleocene mudstone samples from Lishui sag, and several geochemical characteristics of trace elements are comprehensively analyzed, such as abundance, combination and variation. The results show that the trace element contents and their ratios may change depending on Paleocene provenances and sedimentary diagenetic environments in Lishui sag. For the tectonic environment, this sag was along an active continental margin in Paleocene, and for the sedimentary environments, there were an early Paleocene arid hot climate and a late Paleocene alternation between warm humid and arid hot climates in the sag. The provenance of Paleocene mudstone may mainly be acidic rocks.