川东北盘龙洞长兴组-飞仙关组白云岩化特征及成因

doi:10.11743/ogg20120111

Abstract

Abstract:

Systematic field investigation and thin section observation as well as electron microprobe determination reveal that dolomitization is common in the Changing and Feixianguan formations in Panlongdong,northeastern Sichuan Basin.Various types of dolomites are developed and distributed vertically in obvious zonation.From bottom to top,they are biological clasitic dolomite,reef dolomite,crystalline dolomite,oolitic dolomite and micrite dolomite respectively.Our study showed that three genetic models could account for the formation process of the dolomites,including mixed-water dolomitization,infiltration and circumfluence dolomitization as well as penecontemporaneous dolomitization.The biological clasitic and reef dolomites were mainly formed through the mixed-water dolomitization,which occurred in relatively open diagenesis environment with meteoric water input.These dolomites had different δ¹³C values and more negative δ¹⁸O values and remained original sedimentary structure of rocks which restricted dolomitization.The infiltration and circumfluence dolomitization resulted in the formation of the crystalline and oolitic dolomites which have same δ¹³C values,less negative δ¹⁸O valuse,Fe and Mn contents.The penecontemporaneous dolomitization created the micrite dolomite with tight lithology and less negative δ¹³C and δ¹⁸O values.

Key words: dolomitization, genesis, Changing Formation, Feixianguan Formation, Panlongdong, northeastern Sichuan Basin

CLC Number:

TE122.2

Chen Qi, Hu Wenxuan, Li Qing, Zhu Jingquan. Characteristics and genesis of dolomitization in Changxing and Feixianguan Formations in Panlongdong,northeastern Sichuan Basin[J]. Oil & Gas Geology, 2012, 33(1): 84-93.

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Characteristics and genesis of dolomitization in Changxing and Feixianguan Formations in Panlongdong,northeastern Sichuan Basin

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