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Permian sequence stratigraphy of slope facies in southern Guizhou and chronostratigraphic correlation 被引量:7

Permian sequence stratigraphy of slope facies in southern Guizhou and chronostratigraphic correlation
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摘要 The Permian in slope facies area of southern Guizhou consists of 16 third order sequences, which can be grouped as four sequence sets and further into two mesosequences. Most of them are delineated by conformable or submarine erosion surfaces, and well controlled by conodont and fusulinid zones. Four important sea-level falls are recognized in the area, which occur respectively at the basalSweetognathodus whitei zone, lowerS.aff.hanzhongensis zone, middleJinogondolella xuanhanensis zone and the basalClarkina yini zone. Among the recognized transgression events, three are regarded as the most significant. They occur respectively at the basalNeogondolella exculptus zone, basalJinogondolella nankingensis zone and the lowerClarkina postbitteri zone, and are all accompanied by faunal turnovers. The key surfaces in sequences can be used to fine-tune the boundaries of bio-chronozones, stages and series. The Permian in slope facies area of southern Guizhou consists of 16 third order sequences, which can be grouped as four sequence sets and further into two mesosequences. Most of them are delineated by conformable or submarine erosion surfaces, and well controlled by conodont and fusulinid zones. Four important sea-level falls are recognized in the area, which occur respectively at the basal Sweetognathodus white! zone, lower S.aff. hanzhongensis zone, middle Jinogondolella xuanhanensis zone and the basal Clarkina y/n/zone. Among the recognized transgression events, three are regarded as the most significant. They occur respectively at the basal Neogondolella exculptus zone, basal Jinogondolella nankingensis zone and the lower Clarkina postbitteri zone, and are all accompanied by faunal turnovers. The key surfaces in sequences can be used to fine-tune the boundaries of bio-chronozones, stages and series.
出处 《Science China Earth Sciences》 SCIE EI CAS 2000年第1期63-76,共14页 中国科学(地球科学英文版)
关键词 PERMIAN sequence stratigraphy SLOPE FACIES SOUTHERN GUIZHOU correlation. Permian sequence stratigraphy slope facies southern Guizhou correlation
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