潜江凹陷潜江组古盐湖沉积层序的地球化学特征

Geochemistry Character in Paleo-saline Depositional Sequence on Qianjiang Group in Qianjiang Depression

中文关键词:  盐湖 沉积层序 地球化学 稳定同位素 氧同位素 层序地层学 潜江凹陷 碳同位素

英文关键词:Geochemistry,Stable isotope,Carbon-isotope and oxygen-isotope,Sequence stratigraphy,Qianjiang depression

中文摘要:

      通过对江汉盆地潜江凹陷古盐湖的碳氧同位素等地球化学参数的测试分析，讨论了在湖平面变化周期内，碳、氧同位素以及粘土矿物中Al2O3/MgO比值等参数的变化特征，而且它们与层序地层单元的发育有较好的对应关系，潜江凹陷岩心实测资料的研究表明，层序地层单元中的各个体系域具有一定的地球化学特征，可以利用这些地球化学指标来判断湖平面的变化，划分三级层序以及内部的体系域。

英文摘要:

      This paper discusses that carbon-isotope,oxygen-isotope, Al 2O 3/MgO in clay mineral and other geochemistry parameters,will change while lake level changes,with studying the geochemistry-character of the Qianjiang group in the Qianjiang depression of Jianghan Basin.These changes can be correlated with the development of sequence stratigraphy units.The measured information from the well -cores in the Qianjiang group in the Qianjiang depression of Jianghan basin prove that the sequences or systems tracts have some geochemistry features.So,we think that the geochemistry character can be used to the division of the sequences and systems tracts.