【摘要】：安徽巢湖地區(qū)在早三疊世斯帕斯亞期經(jīng)歷了從深水盆地到外緩坡兩種環(huán)境的海退過(guò)程。利用穩(wěn)定碳氧同位素測(cè)試結(jié)果,對(duì)巢湖馬家山剖面下三疊統(tǒng)南陵湖組中上段含巢湖龍動(dòng)物群地層的碳氧同位素特征進(jìn)行了初步分析,探討了巢湖龍動(dòng)物群化石產(chǎn)出層段地層所反映的沉積環(huán)境背景。馬家山剖面南陵湖組中段及上段δ13C值變化范圍在-7.312‰~3.936‰之間,變化幅度為11.248‰,平均值-0.857‰。碳同位素與生物初級(jí)生產(chǎn)力成正比,南陵湖組中上段穩(wěn)定碳同位素曲線大幅度負(fù)漂移,說(shuō)明早三疊世海洋生物量稀少,生物初級(jí)生產(chǎn)力較低。同時(shí),研究區(qū)δ18 O值變化范圍在-12.081‰~-3.545‰之間,變化幅度為-8.536‰,平均值-6.598‰。氧同位素與古海水溫度成反比,δ18 O值普遍偏低,很可能說(shuō)明斯帕斯亞期延續(xù)了斯密斯亞期末期海水的高溫度。綜合巢湖地區(qū)馬家山剖面南陵湖組中段及上段地層沉積特征及穩(wěn)定碳氧同位素曲線特征,分析出巢湖龍動(dòng)物群生活在安靜的外緩坡—深水盆地,生物初級(jí)生產(chǎn)力較低且海水溫度總體偏高的環(huán)境中。
[Abstract]:The Chaohu area in Anhui Province experienced a regressive process from deep water basin to gentle slope in the early Triassic Spacia period. Based on the stable carbon and oxygen isotopic test results, the carbon and oxygen isotopic characteristics of Chaohu dragon fauna in the middle and upper member of the lower Triassic Nanling Lake formation in the Majiashan section of Chaohu Lake are preliminarily analyzed. The sedimentary environment background reflected by the strata of the fossil producing strata of the Chaohu Dragon fauna is discussed in this paper. The 未 13C values of the middle and upper sections of Nanling Lake formation in the Majiashan profile range from -7.312 鈥，

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