History of Regional Tectonic Subsidence and Sea Level Changes in Geological History

Zhao Yuguang

The history of regional tectonic subsidence and sea level changes are tw o majo r factors of four factors in sequence stratigraphy.The dynamic model of tecto nic subsidence curves from the Devonian to the Triassic in the study area has been reconstructed by the approach of back stripping.The evolution succession of the basin , which is from the passive continental margin, mature passive continental margin, peripheral foreland basin to post orogeny foreland basin, is identified.At the same time, the curves of sea level changes in the Permian and Triassic have been inversed by the inform ation of sedimentary systems tract, seismic section and isotope of carbon and oxygen.The sea level changes in the study area are in synchronism w ith the global sea level changes. The period of sea level rising in the study area lasts to Changxingian Age of Late Permian and the time of sea level falling is Dalong Age of Late Permian.The sea level changes of Late Triassic in the study area are rising and the global sea level chenges is m ainly in falling stage.It is relative to the o rogenic overthrusting.

Chengdu Institute of Geology and Mineral Resources,Chengdu Sichuan 610082

Received Date: 1997-10-10

Rev Recd Date: 1998-03-03

Publish Date: 1998-08-10

Key words:

Permian and Triassic /
regional tectonic subsidence /
basin evolution /
sea level changes /
the curves of sea level rising and falling /

Abstract: The history of regional tectonic subsidence and sea level changes are tw o majo r factors of four factors in sequence stratigraphy.The dynamic model of tecto nic subsidence curves from the Devonian to the Triassic in the study area has been reconstructed by the approach of back stripping.The evolution succession of the basin , which is from the passive continental margin, mature passive continental margin, peripheral foreland basin to post orogeny foreland basin, is identified.At the same time, the curves of sea level changes in the Permian and Triassic have been inversed by the inform ation of sedimentary systems tract, seismic section and isotope of carbon and oxygen.The sea level changes in the study area are in synchronism w ith the global sea level changes. The period of sea level rising in the study area lasts to Changxingian Age of Late Permian and the time of sea level falling is Dalong Age of Late Permian.The sea level changes of Late Triassic in the study area are rising and the global sea level chenges is m ainly in falling stage.It is relative to the o rogenic overthrusting.

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History of Regional Tectonic Subsidence and Sea Level Changes in Geological History

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