Geological Society of America

T270 Recent Developments in Cyclostratigraphy (Posters)

Tuesday, 24 October 2017
9:00 AM - 6:30 PM
Halls 4EF

GLOBAL CORRELATION OF EARLY TRIASSIC SHALLOW-WATER PLATFORMS IN SOUTH CHINA USING COMBINED MAGNETOSTRATIGRAPHY, CARBON-ISOTOPE EXCURSIONS AND CYCLOSTRATIGRAPHY

Paper number: T270-4
Program: Technical Sessions
Time: 9:00 AM – 6:30 PM

Authors

Yan Chen Presenting Author
China University of Geosciences (Wuhan), Wuhan
Yan Chen Presenting Author
Purdue University, West Lafayette, IN
Yan Chen Presenting Author
China University of Geosciences, Wuhan
Yang Wendy Zhang
China University of Geosciences (Wuhan), Wuhan
Yang Wendy Zhang
Purdue University, West Lafayette, IN
Keke Huang
Chengdu University of Technology, Chengdu
Yifan Gong
China University of Geosciences (Wuhan), Wuhan
Yifan Gong
China University of Geosciences, Wuhan
James Ogg
Purdue University, West Lafayette, IN
James Ogg
China University of Geosciences (Wuhan), Wuhan
Haishui Jiang
China University of Geosciences, Wuhan

Abstract

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.

Geological Society of America Abstracts with Programs. Vol. 49, No. 6

doi: 10.1130/abs/2017AM-305069

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