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Perturbations in the carbon cycle during the carnian humid episode : Carbonate carbon isotope records from southwestern China and Northern Oman

Sun, Y. D. ; Richoz, S. LU ; Krystyn, L. ; Zhang, Z. T. and Joachimski, M. M. (2018) In Journal of the Geological Society 176(1). p.167-177
Abstract

The Carnian Humid Episode is an interval of prominent climatic changes in the Late Triassic. We studied the carbon isotope (δ13C) geochemistry of carbonates from sections in southwestern China and northern Oman. δ13C records from the Yongyue section (western Guizhou, South China) show a progressive positive shift from 1.4 to 2.8‰ in the early to middle Julian 1 substage. This positive trend is followed by a swift negative shift of c. 4.2‰ from 2.8 to −1.4‰ in the Julian 2 substage. δ13C from the Wadi Mayhah section (northern Oman) shows a positive shift from 2.2 to 2.8‰ in the Julian 1 substage, followed by a negative shift of c. 3.2‰ from 2.8 to −0.3‰ in the Julian 2 substage. The δ13C... (More)

The Carnian Humid Episode is an interval of prominent climatic changes in the Late Triassic. We studied the carbon isotope (δ13C) geochemistry of carbonates from sections in southwestern China and northern Oman. δ13C records from the Yongyue section (western Guizhou, South China) show a progressive positive shift from 1.4 to 2.8‰ in the early to middle Julian 1 substage. This positive trend is followed by a swift negative shift of c. 4.2‰ from 2.8 to −1.4‰ in the Julian 2 substage. δ13C from the Wadi Mayhah section (northern Oman) shows a positive shift from 2.2 to 2.8‰ in the Julian 1 substage, followed by a negative shift of c. 3.2‰ from 2.8 to −0.3‰ in the Julian 2 substage. The δ13C 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.

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Contribution to journal
publication status
published
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in
Journal of the Geological Society
volume
176
issue
1
pages
11 pages
publisher
Geological Society of London
external identifiers
  • scopus:85059895332
ISSN
0016-7649
DOI
10.1144/jgs2017-170
language
English
LU publication?
yes
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76f29df0-ef1e-42ea-bebd-5a26029f57db
date added to LUP
2019-01-24 10:46:34
date last changed
2021-10-10 03:23:33
@article{76f29df0-ef1e-42ea-bebd-5a26029f57db,
  abstract     = {<p>The Carnian Humid Episode is an interval of prominent climatic changes in the Late Triassic. We studied the carbon isotope (δ<sup>13</sup>C) geochemistry of carbonates from sections in southwestern China and northern Oman. δ<sup>13</sup>C records from the Yongyue section (western Guizhou, South China) show a progressive positive shift from 1.4 to 2.8‰ in the early to middle Julian 1 substage. This positive trend is followed by a swift negative shift of c. 4.2‰ from 2.8 to −1.4‰ in the Julian 2 substage. δ<sup>13</sup>C from the Wadi Mayhah section (northern Oman) shows a positive shift from 2.2 to 2.8‰ in the Julian 1 substage, followed by a negative shift of c. 3.2‰ from 2.8 to −0.3‰ in the Julian 2 substage. The δ<sup>13</sup>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.</p>},
  author       = {Sun, Y. D. and Richoz, S. and Krystyn, L. and Zhang, Z. T. and Joachimski, M. M.},
  issn         = {0016-7649},
  language     = {eng},
  month        = {08},
  number       = {1},
  pages        = {167--177},
  publisher    = {Geological Society of London},
  series       = {Journal of the Geological Society},
  title        = {Perturbations in the carbon cycle during the carnian humid episode : Carbonate carbon isotope records from southwestern China and Northern Oman},
  url          = {http://dx.doi.org/10.1144/jgs2017-170},
  doi          = {10.1144/jgs2017-170},
  volume       = {176},
  year         = {2018},
}