The Carbon Isotope Cyclostratigraphic Responses to Sea Level Change in Upper Permian Limestones from South China

Li Yucheng

The carbon isotope shifts during Upper Permian in the South China drop gradually, and such phe-nomena may correspond to sea level change. There are two 3rd order cycle of carbon isotope stratigraphy of Late Permian. The early one is included in the lower and middle Wujiapingian Stage, while the lateone is included in the upper Wujiapingian and Changhsingian Stage. The carbon isotope curve in Changhsin-gian of South Chian can be distinguished three 4th order cycles from late 3rd order cycle. It is considered that the limestones with high values of δ¹³C was deposited during highstand of sea level, while those with low values of δ¹³C was deposited at lowerstand of sea level. Therefore, the 3rd or 4th-cycles of carbon isotope curve correspond to the 3rd or 4th order of sea level change, an interpretation supported by se-qence stratigraphy analysis in South China. Based on carbon isotopic curve, the sea level dropped from Wujiapingian to Changhsingian, that is perfectly conincident with the strongest regressions of the end of Permian in the world. It may indicates that the carbon isotopic curves record the global sea level changes, and may suggests that sediments of the changhsingian limestones deposited in transgression in-duced by regional tectonic subsidence in South China.

The Carbon Isotope Cyclostratigraphic Responses to Sea Level Change in Upper Permian Limestones from South China

1. Department of Earth Sciences, Nanjing University;

2. Nanjing Institute of Gelolgy and Paleonotology, Chinese Academy of Sciences Nanjing 21008

Received Date: 1997-09-24

Rev Recd Date: 1998-01-19

Publish Date: 1998-12-10

Key words:

Abstract: The carbon isotope shifts during Upper Permian in the South China drop gradually, and such phe-nomena may correspond to sea level change. There are two 3rd order cycle of carbon isotope stratigraphy of Late Permian. The early one is included in the lower and middle Wujiapingian Stage, while the lateone is included in the upper Wujiapingian and Changhsingian Stage. The carbon isotope curve in Changhsin-gian of South Chian can be distinguished three 4th order cycles from late 3rd order cycle. It is considered that the limestones with high values of δ¹³C was deposited during highstand of sea level, while those with low values of δ¹³C was deposited at lowerstand of sea level. Therefore, the 3rd or 4th-cycles of carbon isotope curve correspond to the 3rd or 4th order of sea level change, an interpretation supported by se-qence stratigraphy analysis in South China. Based on carbon isotopic curve, the sea level dropped from Wujiapingian to Changhsingian, that is perfectly conincident with the strongest regressions of the end of Permian in the world. It may indicates that the carbon isotopic curves record the global sea level changes, and may suggests that sediments of the changhsingian limestones deposited in transgression in-duced by regional tectonic subsidence in South China.

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The Carbon Isotope Cyclostratigraphic Responses to Sea Level Change in Upper Permian Limestones from South China

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