| Triassic Transgressive-Regressive Sequences in Guizhou-Guangxi Region, South China |
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| 作者姓名： | Wei Jiayong |
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| 作者单位： | Wei Jiayong (Regional Geological Survey，Xi'an College of Geology，Xi 'an 710054) Liao Nengmao Yu Youyi (Regional Geological Surveying Institute of Guizhou，Guiyang 550005) |
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| 摘 要： | Theprimaryobjectofthesequencestratigraphyistorecoghzetherepetitivesequenceswithinstratigraphicsuccession,andtostudythetemporalandspatialdistriblltionofdepositionalsyStemsandstratalgeometries.TherearethreemajorparadigmSwhichcanbeusedtOdelineatethesequences:(1)delineatingdepositionalsequenCeSbyimportantunconfodritiesandtheircorrelatableconformitiesopsarnentierandVail,1988),(2)delineatinggeneticsequencesbymaximum--floodingsurfacesandtheircorrelatableconformities(Galloway,1989);and(3)delineating…
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Triassic Transgressive-Regressive Sequences in Guizhou-Guangxi Region, South China |
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| Wei Jiayong.Triassic Transgressive-Regressive Sequences in Guizhou-Guangxi Region, South China[J].Journal of China University of Geosciences,1996(1). |
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| Authors: | Wei Jiayong |
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| Abstract: | Seven third-order transgressive-regressive sequences are recognized in the Early Triassic -Early Carnian stratigraghc succession of Guizhou-Guangxi region, South China. Based on currently available ages by the correlation of conodont ammonites and bivalve faunas, these sequences range approximately from 1.0 Ma to 5.6 Ma, with the average of 3 Ma. They occur largely in the Griesbachian-Dienerian, Smithian,uppermost Smithian-lowermost Anisian, Lower Anisian, Middle Anisian, Upper Anisian-Upper Ladinian and the uppermost Ladinian-Lower Carnian respectively, and can be grouped into three second-order transgressive-regressive supersequences. A relative sea level curve is established from the sequence stratigraghic analysis. Transgressive-regressive sequences,bounded by transgressive surfaces and the correlatable unconformities, are real unconformity-bounded units of lower rank. Each sequence comprises transgressive, highstand and regressive systems tracts, and can be easily correlated with the depositional sequence. |
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| Keywords: | Triassic transgressive-regressive sequence relative sea level change Guizhou Guangxi |
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