摘要
对塔里木盆地西南依格孜牙组和卡拉塔尔组灰岩碳、氧同位素特征研究结果表明,上白垩统依格孜牙组δ13C(PDB标准)平均值为3.79‰,δ18O(PDB标准)平均值为-3.49‰;古近系卡拉塔尔组灰岩δ13C(PDB标准)平均值为2.09‰,δ18O(PDB标准)平均值为-4.54‰.与前人和世界其他剖面数据对比认为,碳同位素比较稳定,能够反映其沉积时的特征,而氧同位素变化较大,可能受沉积后作用的影响.依格孜牙组与卡拉塔尔组灰岩碳同位素具较大差异,主要受陆源环境(?)物质的注入,海水盐度、生物作用和古大气CO2含量等因素的影响.
Analysis and correlation are made of the isotope characters of the limestone from Yigeziya and Kalataer Formations. The mean value of carbon and oxygen isotopes of Yigeziya Fm. is 3.79‰ (PDB) and -3.49‰; and that of Kalataer Fm. 2.09‰ and 4.54‰ respectively. Comparing with other data around the world, the carbon isotope is stable, reflecting its original sedimentary characteristics, but the oxygen isotopic data is not stable, reflecting post-sedimentary effect. The carbon isotope composition is different for Yigeziya Fm. and Kalataer Fm.. This difference is mainly caused by addition of terrestrial materials, and partly by seawater salinity, atmospheric CO2 and photosynthesis of plankton.
出处
《新疆地质》
CAS
CSCD
2002年第z1期88-90,共3页
Xinjiang Geology
基金
国家自然科学基金项目(40072042)资助
关键词
塔里木盆地西南
依格孜牙组
卡拉塔尔组
灰岩
碳同位素
southwestern Tarim basin, Yigeziya Formation, Kalataer Formation, limestone, carbon isotope
