本文選題：四川盆地東部 + 洗象池群�。� 參考：《古地理學(xué)報(bào)》2017年03期

【摘要】：四川盆地東部地區(qū)寒武系洗象池群碳酸鹽巖的碳、氧同位素組成受后期成巖作用影響較小,基本保留了原始海洋的同位素組成,筆者根據(jù)采集的111個(gè)碳、氧同位素?cái)?shù)據(jù),研究、討論了盆地東部地區(qū)中上寒武統(tǒng)碳酸鹽巖碳、氧同位素組成、演化及地質(zhì)意義。研究表明,δ~(13)C值變化介于-3.36‰~2.65‰之間,均值為-1.027‰,絕大多數(shù)的樣品都分布在-2‰~2‰的區(qū)間,δ~(18)O值分布于-11.1‰~-6.01‰之間,均值為-7.991‰,在-10‰~-6‰的范圍內(nèi)波動(dòng)。通過對(duì)碳、氧同位素?cái)?shù)據(jù)分析研究,認(rèn)為四川盆地東部地區(qū)洗象池群主要發(fā)育在鹽度較高、溫暖—炎熱的近岸海相沉積環(huán)境;洗象池群沉積早期和中期經(jīng)歷了短暫而快速的海侵后進(jìn)入緩慢的海退,在晚期緩慢海侵后的快速海退,碳同位素組成反映的海平面變化趨勢(shì)與沉積相演化一致。洗象池群沉積中期顯著的碳同位素正向漂移,標(biāo)志著較高的生產(chǎn)力和有機(jī)碳埋藏率,具有重要的石油地質(zhì)學(xué)意義。
[Abstract]:The carbon and oxygen isotopic compositions of carbonate rocks of Cambrian wash elephant pool group in the eastern part of Sichuan Basin are less affected by late diagenesis, and the isotopic composition of the primitive ocean is basically preserved. The author has studied the carbon and oxygen isotopes collected from 111 carbon and oxygen isotopes. The carbon, oxygen isotopic composition, evolution and geological significance of carbonate rocks of the Middle and Upper Cambrian in the eastern part of the basin are discussed. The results show that the value of 未 ~ (13) C varies from -3.36 鈥，

本文編號(hào)：1989600