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Perturbations in the carbon cycle during the Carnian Humid Episode; carbonate carbon isotope records from southwestern China and northern Oman

Y. D. Sun, S. Richoz, L. Krystyn, Z. T. Zhang and M. M. Joachimski
Perturbations in the carbon cycle during the Carnian Humid Episode; carbonate carbon isotope records from southwestern China and northern Oman
Journal of the Geological Society of London (September 2018) 176 (1): 167-177

Abstract

The Carnian Humid Episode is an interval of prominent climatic changes in the Late Triassic. We studied the carbon isotope (delta (super 13) C) geochemistry of carbonates from sections in southwestern China and northern Oman. delta (super 13) C records from the Yongyue section (western Guizhou, South China) show a progressive positive shift from 1.4 to 2.8 ppm in the early to middle Julian 1 substage. This positive trend is followed by a swift negative shift of c. 4.2 ppm from 2.8 to -1.4 ppm in the Julian 2 substage. delta (super 13) C from the Wadi Mayhah section (northern Oman) shows a positive shift from 2.2 to 2.8 ppm in the Julian 1 substage, followed by a negative shift of c. 3.2 ppm from 2.8 to -0.3 ppm in the Julian 2 substage. The delta (super 13) C records from the two study sections generally correlate well with each other as well as with published records, pointing to a considerable input of isotopically light carbon starting in the late Julian 1 substage. Such a large amount of light carbon probably derived from direct degassing and the sediment-sill contact metamorphism of the Panthalassan Wrangellia Large Igneous Province and contemporary Tethyan volcanism. The voluminous volcanogenic greenhouse gases probably contributed to the warming pulse in the middle Carnian. Thus the dry-wet climatic transition during the Carnian Humid Episode is best interpreted as a warm climate-driven intensification of the activities of the atmospheric circulation and hydrological cycle.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 176
Serial Issue: 1
Title: Perturbations in the carbon cycle during the Carnian Humid Episode; carbonate carbon isotope records from southwestern China and northern Oman
Affiliation: Universitaet Erlangen-Nuernberg, GeoZentrum Nordbayern, Erlangen, Germany
Pages: 167-177
Published: 20180912
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 91
Accession Number: 2018-086775
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., geol. sketch maps
N25°24'39" - N25°24'39", E105°33'23" - E105°33'23"
N24°47'42" - N24°47'42", E55°53'50" - E55°53'50"
Secondary Affiliation: Lund University, SWE, SwedenUniversity of Vienna, AUT, AustriaChina University of Geosciences, CHN, China
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201847
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