CAJ | 학술논문

前人对川东南地区石牛栏组地层已进行了大量的研究工作,但有关同位素地球化学方面的研究尚未见报道.本区石牛栏组沉积成因碳酸盐岩的碳同位素值与前人的研究结果一致,而氧同位素值则有所偏低;白云岩δ~(13)C值低,δ~(18)O值高,反映受成岩环境的影响较明显;裂缝中方解石的碳、氧同位素组成分布于两个不同的区间,说明不同期次裂缝充填物形成时的流体性质发生了明显的变化;沉积成因碳酸盐岩具异常低的锶同位素值,与前人研究结果有明显的差异,推测是受贫~(87)Sr同位素的成岩流体的影响;晚期裂缝充填物锶同位素比值较高,也表明它们受到了地表淡水的影响.
전인대천동남지구석우란조지층이진행료대량적연구공작,단유관동위소지구화학방면적연구상미견보도.본구석우란조침적성인탄산염암적탄동위소치여전인적연구결과일치,이양동위소치칙유소편저;백운암δ~(13)C치저,δ~(18)O치고,반영수성암배경적영향교명현;렬봉중방해석적탄、양동위소조성분포우량개불동적구간,설명불동기차렬봉충전물형성시적류체성질발생료명현적변화;침적성인탄산염암구이상저적송동위소치,여전인연구결과유명현적차이,추측시수빈~(87)Sr동위소적성암류체적영향;만기렬봉충전물송동위소비치교고,야표명타문수도료지표담수적영향.
A lot of researches have been accomplished in the Shiniulan Formation of southeast area of sichuan, but few were about isotope geochemistry. Obtained data of carbon isotope of the Shiniulan formation is similar with those of the former researches in the Sichuan basin and around, while the oxygen isotope data is lower than those of others. Dolomite has low δ~(13)C value and high δ~(18)O value, reflecting the significant effects of its diagenesis environment; the δ~(13)C and δ~(18)O values of calcite in fractures distribute in two different spans indicates the different characteristics of filled liquids in two periods of fracturing; The ~(87)Sr/~(86)Sr ratio of sedimentary carbonate is very low and is obviously different from those of the former researches, and this may be caused by low ~(87)Sr diagenetic fluids; calcite in the late fractures has relatively high value of ~(87)Sr/~(86)Sr reflects that calcite in the late fractures is affected by fresh water from the ground.