Paper No. 270-4
Presentation Time: 9:00 AM-6:30 PM
GLOBAL CORRELATION OF EARLY TRIASSIC SHALLOW-WATER PLATFORMS IN SOUTH CHINA USING COMBINED MAGNETOSTRATIGRAPHY, CARBON-ISOTOPE EXCURSIONS AND CYCLOSTRATIGRAPHY
CHEN, Yan, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, 430074, China; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051; School of Earth Sciences, China University of Geosciences, Wuhan, 430074, ZHANG, Yang Wendy, Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, 430074, China, HUANG, Keke, State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Institution of Sedimentary Geology, Chengdu University of Technology, Chengdu, 610059, China, GONG, Yifan, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, 430074, China; School of Earth Sciences, China University of Geosciences, Wuhan, 430074, OGG, James G., State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, 430074, China; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051 and JIANG, Haishui, Earth Sciences, China University of Geosciences, Faculty of Earth Sciences, Wuhan, Hubei 430074, yan_chen027@163.com
Dating ancient shallow-water platform facies, especially those that lack biostratigraphic markers and have exposure horizons, has been a challenge. However, for multi-million-year successions, it is possible to apply a combination of non-unique signals from magnetostratigraphy, carbon-isotope trends and excursions and cyclostratigraphy to project a fairly precise age model for the geologic ages, the changing accumulation rates, and the approximate duration of hiatuses.
We have successfully applied integrated stratigraphy to thick (ca. 1 km) carbonate platform successions in Sichuan Province and Chongqing (Xiejiacao and Xueyu Cave sections) that span most of the Lower Triassic (basal Induan through Olenekian stages) in inner-platform to evaporite facies. These shallow-water sections can be correlated in detail to the bio-magnetic-isotope-cycle reference scales from deepwater facies (e.g., Chaohu, the proposed GSSP for the Olenekian Stage). The correlations are partly constrained by rare horizons with conodonts.
The poster will also present Youping (Guangxi Province), a new bio-mag-isotope reference section in conodont-bearing progressively deepening facies, from shallow carbonate platform facies to deep carbonate and mudstone basin facies, spanning the Early Triassic through the Olenekian-Anisian stage boundary, which can be correlated to Guandao, a possible candidate for the GSSP of the Anisian Stage.
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