High-resolution SIMS oxygen isotope analysis on conodont apatite from South China and implications for the end-Permian mass extinction

Understanding the interplay of climatic and biological events in deep time requires resolving the precise timing and pattern of paleotemperature changes and their temporal relationship with carbon cycle variations and biodiversity fluctuations. In situ oxygen isotope analyses of conodont apatite fro...

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Bibliographic Details
Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Chen, Jun, Shen, Shu-zhong, Li, Xian-hua, Xu, Yi-gang, Joachimski, Michael M., Bowring, Samuel A., Erwin, Douglas H., Yuan, Dong-xun, Chen, Bo, Zhang, Hua, Wang, Yue, Cao, Chang-qun, Zheng, Quan-feng, Mu, Lin
Format: Report
Language:English
Published: ELSEVIER SCIENCE BV 2016
Subjects:
Physical Geography
Geology
Paleontology
SIMS
Oxygen isotope
Conodont apatite
South China
Climate warming
End-Permian mass extinction
Geography
Physical
Geosciences
Multidisciplinary
LARGE IGNEOUS PROVINCES
PALEOZOIC ICE-AGE
TRIASSIC BOUNDARY
BIOGENIC APATITES
OCEAN ACIDIFICATION
CHANGHSINGIAN STAGE
STRATOTYPE SECTION
SIBERIAN TRAPS
CARBON-CYCLE
POINT GSSP
Ocean acidification
Online Access:http://ir.gig.ac.cn/handle/344008/55188
https://doi.org/10.1016/j.palaeo.2015.11.025
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Summary:Understanding the interplay of climatic and biological events in deep time requires resolving the precise timing and pattern of paleotemperature changes and their temporal relationship with carbon cycle variations and biodiversity fluctuations. In situ oxygen isotope analyses of conodont apatite from South China enables us to reconstruct high-resolution seawater temperature records across the Permian-Triassic boundary (PTB) intervals in the upper slope (Meishan), lower slope (Shangsi), and carbonate platform (Daijiagou and Liangfengya) settings. Constrained by the latest high-precision geochronological dates and high-resolution conodont biozones, we can establish the temporal and spatial patterns of seawater temperature changes and assess their potential connections with the carbon cycle disruption and biodiversity decline. We find a rapid warming of similar to 10 degrees C during the latest Permian-earliest Triassic that postdated the onset of the negative shift in delta C-13(carb) by similar to 81 kyr (thousand years), the abrupt decline in delta C-13(carb) by similar to 32 kyr and the onset of mass extinction by similar to 23 kyr, which contradicts previous claims that the extreme temperature rise started immediately before or coincided with the onset of mass extinction. Our new evidence indicates that climate warming was most likely not a direct cause for the main pulse of the end-Permian mass extinction (EPME), but rather a later participant or a catalyst that increased the pace of the biodiversity decline. In addition, a prominent cooling is recorded in the earliest Changhsingian, with the main phase (a drop of similar to 8 degrees C in similar to 0.2 Ma) confined to the lower part of the Clarkina wangi zone and synchronous with the positive limb of the carbon isotope excursion (CIE) around the Wuchiapingian-Changhsingian boundary (WCB) in Meishan and Shangsi. Further long-term and high-resolution studies from other sections are needed to confirm the full contexts and underlying dynamics of the WCB "cooling event". (C) 2015 Elsevier B.V. All rights reserved.

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