1 成都理工大学沉积地质研究院,四川成都 610059; 2 Department of Geosciences,University of Padova,Via Gradenigo 6,35131 Padua,Italy
Characteristics and geological significance of corrosion karst at the top of Middle Triassic in northwestern Sichuan Basin
Wu Bing1, Jin Xin2, Shi Zhi-Qiang1, Nereo Preto2, Du Yi-Xing1
1 Insitute of Sedimentary Geology,Chengdu University of Technology,Chegndu 610059,Sichuan; 2 Department of Geosciences,University of Padova,Via Gradenigo 6,35131 Padua,Italy
Abstract：The corrosion karst at the top of the Middle Triassic was widely found at the Jinhe section in Shifang and in most parts of the Sichuan Basin. With the recent field studies,we identified this karst surface in the Triassic sections at Hanwang Guanyinya in Mianzhu,Huanglianqiao and Ma'antang in Jiangyou along the northwest margin of the Sichuan Basin. The karst yielded in top Tianjingshan Formation and its origin is thought to be related to strong tectonic activity and global sea-level fall that resulted in long-time exposure of the Middle Triassic. The main forms of the karst are as follows: (1)exposed erosion and discontinuous sedimentary surfaces,(2)solution channels, solution fractures and associated carbonate and terrigenous clastic fillings,(3)exposed clay layer,and(4)karst breccia. The exposed erosion and discontinuous sedimentary surfaces are most typical of birdeye structures or stromatactis,and at the Hanwang Guanyinya section in Mianzhu, they are most developed. The fillings of solution channels and fractures are mainly carbonate and terrigenous debris,commonly developed at the Ma'antang section in Jiangyou,Hanwang Guanyinya section in Mianzhu and Jinhe section in Shifang. The related dissolution joints and dissolution ditches are nearly vertical,with different widths and depths,and are filled with carbonate breccia,sparite, dolomite or terrigenous clay. The exposure soil is mainly confined to Huanglianqiao section in Jiangyou where two sets of exposure soils,about 5~20 cm thick each,contain iron minerals and the overlying and underlying intervals are dark gray limestone deposited in a lagoon paleoenvironment. The karst breccia is most common at Hanwang Guanyinya section in Mianzhu,with a maximum breccia size of up to 15×20 cm. The angular karst breccia is surrounded by dark carbonate matrix rich in mud and organic matter. The discovery of the corrosion-type karst at or near the top of the Tianjingshan Formation can provide the basis for regional stratigraphic isochronous correlation. In addition,the paleo-karst oil/gas accumulations can be formed in the carbonate rocks at the upper Tianjingshan and Leikoupo Formations with dissolution pores and fractures as the main storage space.
Wu Bing,Jin Xin,Shi Zhi-Qiang et al. Characteristics and geological significance of corrosion karst at the top of Middle Triassic in northwestern Sichuan Basin[J]. JOPC, 2018, 20(1): 133-146.
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