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Correlation and high-resolution timing for Paleo-tethys Permian-Triassic boundary exposures in Vietnam and Slovenia using geochemical, geophysical and biostratigraphic data sets

Luu Thi Phuong Lan, Ellwood Brooks B., Tomkin Jonathan H., Nestell Galina P., Nestell Merlynd K., Ratcliffe Kenneth T., Rowe Harry, Dang Tran Huyen, Nguyen Thanh Dung, Nguyen Chien Thang, Nguyen Ha Thanh, Dao Van Quyen

Abstract


Two Permian-Triassic boundary (PTB) successions, Lung Cam in Vietnam, and Lukač in Slovenia, have been sampled for high-resolution magnetic susceptibility, stable isotope and elemental chemistry, and biostratigraphic analyses. These successions are located on the eastern (Lung Cam section) and western margins (Lukač section) of the Paleo-Tethys Ocean during PTB time. Lung Cam, lying along the eastern margin of the Paleo-Tethys Ocean provides an excellent proxy for correlation back to the GSSP and out to other Paleo-Tethyan successions. This proxy is tested herein by correlating the Lung Cam section in Vietnam to the Lukač section in Slovenia, which was deposited along the western margin of the Paleo-Tethys Ocean during the PTB interval. It is shown herein that both the Lung Cam and Lukač sections can be correlated and exhibit similar characteristics through the PTB interval. Using time-series analysis of magnetic susceptibility data, high-resolution ages are obtained for both successions, thus allowing relative ages, relative to the PTB age at ~252 Ma, to be assigned. Evaluation of climate variability along the western and eastern margins of the Paleo-Tethys Ocean through the PTB interval, using d18O values indicates generally cooler climate in the west, below the PTB, changing to generally warmer climates above the boundary. A unique Black Carbon layer (elemental carbon present by agglutinated foraminifers in their test) below the boundary exhibits colder temperatures in the eastern and warmer temperatures in the western Paleo-Tethys Ocean.

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Keywords


Permian-Triassic boundary; Vietnam, Slovenia; time-series analysis; Black Carbon; magnetostratigraphy susceptibility; Hindeodus parvus

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DOI: https://doi.org/10.15625/0866-7187/40/3/12617

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Vietnam Journal of Earth Sciences, ISSN: 0866 - 7187

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