Strontium Isotope Evolution and Global Sea-level Changes of Carboniferous and Permian Marine Carbonate，Upper Yangtze Platform

HUANG Si-jing; SHI He; ZHANG Meng; SHEN Li-cheng; LIU Jie; WU Wen-hui

The evoIution of strontium isotopic composition of originaI seawater is a function of geoIogicaI time，and mainIy controIIed by the gIobaI sea-IeveI changes. The evoIutionaI curves of the strontium isotopic composition of Carboniferous and Permian marine carbonate rocks，Upper Yangtze PIatform is guite consistent with trend of the sea-IeveI changes. This variation curve of the strontium isotope shows the foIIowing facts： 1）The gIobaI sea-IeveI rise is corresponding to the faIIing of strontium isotope. The point of the minimum vaIue of ⁸⁷ Sr / ⁸⁶ Sr in the earIy Carboniferous is just the position of maximum fIooding surface for the period of earIy Carboniferous，of which the numeric age is 342 Ma. This key point is just Iocated at the boundary of Tournaisian and Visean，for the Huishui section in Guizhou of Province，which is Iocated at the boundary between Jiusi and Shangsi formation. 2）The Iate Carboniferous is a period of gIobaI sea-IeveI faIIing. 3）The Permian，from the beginning to the end，is a period of gIobaI sea-IeveI rise. During the Iate Permian，we can see that the sea IeveI was rising unceasingIy and the marine water became deepIy in short time. 4）The Iate Permian is provided with the strontium isotopic minimum of marine carbonate rocks throughout the Late PaIaeozoic，representing the gIobaI marine fIooding event. The numeric age of the fIooding is 250 Ma，which nears to the Permian-Triassic boundary. 5）The mass extinction at the boundary of Permian-Triassic is probabIy due to the gIobaI marine fIooding event of Iate Permian.

Strontium Isotope Evolution and Global Sea-level Changes of Carboniferous and Permian Marine Carbonate，Upper Yangtze Platform

State Key laboratory of Oil /Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059

Received Date: 2000-12-26

Rev Recd Date: 2001-03-19

Publish Date: 2001-09-10

Key words:

Abstract: The evoIution of strontium isotopic composition of originaI seawater is a function of geoIogicaI time，and mainIy controIIed by the gIobaI sea-IeveI changes. The evoIutionaI curves of the strontium isotopic composition of Carboniferous and Permian marine carbonate rocks，Upper Yangtze PIatform is guite consistent with trend of the sea-IeveI changes. This variation curve of the strontium isotope shows the foIIowing facts： 1）The gIobaI sea-IeveI rise is corresponding to the faIIing of strontium isotope. The point of the minimum vaIue of ⁸⁷ Sr / ⁸⁶ Sr in the earIy Carboniferous is just the position of maximum fIooding surface for the period of earIy Carboniferous，of which the numeric age is 342 Ma. This key point is just Iocated at the boundary of Tournaisian and Visean，for the Huishui section in Guizhou of Province，which is Iocated at the boundary between Jiusi and Shangsi formation. 2）The Iate Carboniferous is a period of gIobaI sea-IeveI faIIing. 3）The Permian，from the beginning to the end，is a period of gIobaI sea-IeveI rise. During the Iate Permian，we can see that the sea IeveI was rising unceasingIy and the marine water became deepIy in short time. 4）The Iate Permian is provided with the strontium isotopic minimum of marine carbonate rocks throughout the Late PaIaeozoic，representing the gIobaI marine fIooding event. The numeric age of the fIooding is 250 Ma，which nears to the Permian-Triassic boundary. 5）The mass extinction at the boundary of Permian-Triassic is probabIy due to the gIobaI marine fIooding event of Iate Permian.

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Reference (1)

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Strontium Isotope Evolution and Global Sea-level Changes of Carboniferous and Permian Marine Carbonate，Upper Yangtze Platform

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