摘要
泌阳断陷下第三系核三上段可划分为三个陆相层序（S4、S5和S6）．每一层序自下而上发育TST、HST和RST三个体系域。对泌阳断陷下第三水核三上段S5层岸各体系域中几类岩石地球化学标型参数的研究发现，在S5层序形成时期，由于在一个旋回性变迁的古气候（古湿度和古温度）驱动下，湖平面发生了一次完整的旋回性变化；湖泊水体的物理化学条件（古盐度、古酸碱度、古氧化还原电位等）及物源性质亦随之发生一次旋回性变化：相应地，沉积岩中岩石类型、矿物成分（主要指粘土矿物和胶结物）、化学成分（包括常量元素和微量元素及水溶性离子等）以及碳、氧同位素等皆发生了一次旋回性变化。
The upper member of Eh3 in the Biyang fault depression can be classified as three terrigenous sequences,and each of them consists of TST, HST and RST. By studying litholoyic-geochemical typomorphic parameters of the upper member of Eh3 in the Biyang fault depression, it has bo found tha in pace of a cyclicity of palaeoclimate (including palaeohumidity and palaeotemperature) during the formattion period of sequence S5,lake-water physicochemical conditions (including palaeosalinity, pH, Eh, etc.) and sedimentary source features would undergo a cyclic chang, and along with this, the litholyical types of sedimentary rock, mineral composition (clay-mineral and cement), chemical consituents (including major element, trace element, watersoluble ion, etc. ) and C and O isotope would be cyclically changed.
出处
《地质地球化学》
CSCD
北大核心
1998年第2期45-52,共8页
Geology-Geochemistry
关键词
泌阳断陷
陆相层序
体系域
岩石地球化学
旋回性
Biyang fault depression
terrigenous sequence
system tract
lithologic-geochemistry
cyclicity
