Cyclostratigraphy of Mid-Cretaceous in Southern Tibet

Tao Ran; Zeng Yunfu; Wang Chengshan

Abstract

Cycles of mid-cretuceous in southern Tibet are divided into four ciders by cyclic characteristics.The first order is shown in the up-and-down of sea level.The second order is represented by pelaeoproductivity and redo and five cycles of which periods (2Ma) obtained by the methed of AR-FFT corresPOnding in theoretically orbital parameter (2.03Ma) Caculated by Berser (1988) are due to rhythmical changes of polaeocurrent.The third cycle is represented by con pletS (Limestone / Marl and black shale / limestone ), and three im portan t periods of cycles are 43,52 and 92 thousand years respectively, which corresponds to the periods of obliquity and eccentricity and were origined from palaeoproduotivity and dilution by climatic variations which are resulted from the changes of orbital paameters.The fourth order cycle is represented by fine horizontal laminations caused by seasonal variations.

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References

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Cyclostratigraphy of Mid-Cretaceous in Southern Tibet

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References

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