Structure and evolution characteristics analysis of Triassic in northern Sichuan Basin

In northern Sichuan Basin, it is divided into upper and lower structural layer by large set of gypsum of Lower Triassic Jialingjiang Formation 4th~5th section. At the upper structural layer, gypsum is the main decollement. And faults of upper and lower structural layers terminate in the gypsum. In e...

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Veröffentlicht in:Dizhi kexue 2013-01, Vol.48 (1), p.71-92
Hauptverfasser: Zhou, Lu, Li, Fei, He, Dengfa, Hu, Yan, Wu, Yong, Lu, Peng
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Sprache:chi
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Zusammenfassung:In northern Sichuan Basin, it is divided into upper and lower structural layer by large set of gypsum of Lower Triassic Jialingjiang Formation 4th~5th section. At the upper structural layer, gypsum is the main decollement. And faults of upper and lower structural layers terminate in the gypsum. In eastern, tectonic movement is most intense, faults are very developmental. In the central region, faults are relative developmental in the upper structural layer and non developmental in the lower layer. The western part have minimal impact of tectonic movement with non developmental faults. There are some main fault styles, such as the "Y" or anti-"Y" combination, branching, parallel and ramp faults. Triassic developed NE-SW trending faults in Pingchang-Dazhou-Xuanhan area, NW-SE trending faults in the east area to Tongjiang, irregular trending faults in Pingchang-Longgang area in where it suffered complicated forces, N-S trending faults in Yuanba area, and gradually non developmental fault in the western part. The
ISSN:0563-5020
DOI:10.3969/j.issn.0563-5020.2013.01.004