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Title: Global perturbation of the marine calcium cycle during the Permian-Triassic transition

Abstract

A negative shift in the calcium isotopic composition of marine carbonate rocks spanning the end-Permian extinction horizon in South China has been used to argue for an ocean acidification event coincident with mass extinction. This interpretation has proven controversial, both because the excursion has not been demonstrated across multiple, widely separated localities, and because modeling results of coupled carbon and calcium isotope records illustrate that calcium cycle imbalances alone cannot account for the full magnitude of the isotope excursion. Here, we further test potential controls on the Permian-Triassic calcium isotope record by measuring calcium isotope ratios from shallow-marine carbonate successions spanning the Permian-Triassic boundary in Turkey, Italy, and Oman. All measured sections display negative shifts in δ 44/40Ca of up to 0.6‰. Consistency in the direction, magnitude, and timing of the calcium isotope excursion across these widely separated localities implies a primary and global δ 44/40Ca signature. Based on the results of a coupled box model of the geological carbon and calcium cycles, we interpret the excursion to reflect a series of consequences arising from volcanic CO 2 release, including a temporary decrease in seawater δ 44/40Ca due to short-lived ocean acidification and a more protracted increase in calcium isotopemore » fractionation associated with a shift toward more primary aragonite in the sediment and, potentially, subsequently elevated carbonate saturation states caused by the persistence of elevated CO 2 delivery from volcanism. Locally, changing balances between aragonite and calcite production are sufficient to account for the calcium isotope excursions, but this effect alone does not explain the globally observed negative excursion in the δ 13C values of carbonate sediments and organic matter as well. Only a carbon release event and related geochemical consequences are consistent both with calcium and carbon isotope data. Furthermore, the carbon release scenario can also account for oxygen isotope evidence for dramatic and protracted global warming as well as paleontological evidence for the preferential extinction of marine animals most susceptible to acidification, warming, and anoxia.« less

Authors:
 [1];  [2];  [3];  [2];  [4];  [4];  [5];  [6];  [6];  [2];  [7];  [8];  [9];  [10];  [11]
  1. Univ. of Houston, Houston, TX (United States); Testlab Geo-Ambiental, Antioquia (Columbia); Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. The Univ. of Leeds, Leeds (United Kingdom)
  5. Helmholtz Center for Ocean Research, Kiel (Germany)
  6. Univ. of California, Berkeley, CA (United States)
  7. Trinity Univ., San Antonio, TX (United States)
  8. Middle East Technical Univ., Cankaya (Turkey)
  9. Guizhou Univ. Guiyang, Guizhou (China)
  10. Karl-Franzens-Univ. Graz, Graz (Austria); Lund Univ., Lund (Sweden)
  11. Univ. of California, Santa Cruz, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
OSTI Identifier:
1479423
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Geological Society of America, Bulletin
Additional Journal Information:
Journal Volume: 130; Journal Issue: 7-8; Journal ID: ISSN 0016-7606
Publisher:
Geological Society of America
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Silva-Tamayo, Juan Carlos, Lau, Kimberly V., Jost, Adam B., Payne, Jonathan L., Wignall, Paul B., Newton, Robert J., Eisenhauer, Anton, Depaolo, Donald J., Brown, Shaun, Maher, Kate, Lehrmann, Daniel J., Altiner, Demir, Yu, Meiyi, Richoz, Sylvain, and Paytan, Adina. Global perturbation of the marine calcium cycle during the Permian-Triassic transition. United States: N. p., 2018. Web. doi:10.1130/B31818.1.
Silva-Tamayo, Juan Carlos, Lau, Kimberly V., Jost, Adam B., Payne, Jonathan L., Wignall, Paul B., Newton, Robert J., Eisenhauer, Anton, Depaolo, Donald J., Brown, Shaun, Maher, Kate, Lehrmann, Daniel J., Altiner, Demir, Yu, Meiyi, Richoz, Sylvain, & Paytan, Adina. Global perturbation of the marine calcium cycle during the Permian-Triassic transition. United States. doi:10.1130/B31818.1.
Silva-Tamayo, Juan Carlos, Lau, Kimberly V., Jost, Adam B., Payne, Jonathan L., Wignall, Paul B., Newton, Robert J., Eisenhauer, Anton, Depaolo, Donald J., Brown, Shaun, Maher, Kate, Lehrmann, Daniel J., Altiner, Demir, Yu, Meiyi, Richoz, Sylvain, and Paytan, Adina. Thu . "Global perturbation of the marine calcium cycle during the Permian-Triassic transition". United States. doi:10.1130/B31818.1. https://www.osti.gov/servlets/purl/1479423.
@article{osti_1479423,
title = {Global perturbation of the marine calcium cycle during the Permian-Triassic transition},
author = {Silva-Tamayo, Juan Carlos and Lau, Kimberly V. and Jost, Adam B. and Payne, Jonathan L. and Wignall, Paul B. and Newton, Robert J. and Eisenhauer, Anton and Depaolo, Donald J. and Brown, Shaun and Maher, Kate and Lehrmann, Daniel J. and Altiner, Demir and Yu, Meiyi and Richoz, Sylvain and Paytan, Adina},
abstractNote = {A negative shift in the calcium isotopic composition of marine carbonate rocks spanning the end-Permian extinction horizon in South China has been used to argue for an ocean acidification event coincident with mass extinction. This interpretation has proven controversial, both because the excursion has not been demonstrated across multiple, widely separated localities, and because modeling results of coupled carbon and calcium isotope records illustrate that calcium cycle imbalances alone cannot account for the full magnitude of the isotope excursion. Here, we further test potential controls on the Permian-Triassic calcium isotope record by measuring calcium isotope ratios from shallow-marine carbonate successions spanning the Permian-Triassic boundary in Turkey, Italy, and Oman. All measured sections display negative shifts in δ44/40Ca of up to 0.6‰. Consistency in the direction, magnitude, and timing of the calcium isotope excursion across these widely separated localities implies a primary and global δ44/40Ca signature. Based on the results of a coupled box model of the geological carbon and calcium cycles, we interpret the excursion to reflect a series of consequences arising from volcanic CO2 release, including a temporary decrease in seawater δ44/40Ca due to short-lived ocean acidification and a more protracted increase in calcium isotope fractionation associated with a shift toward more primary aragonite in the sediment and, potentially, subsequently elevated carbonate saturation states caused by the persistence of elevated CO2 delivery from volcanism. Locally, changing balances between aragonite and calcite production are sufficient to account for the calcium isotope excursions, but this effect alone does not explain the globally observed negative excursion in the δ13C values of carbonate sediments and organic matter as well. Only a carbon release event and related geochemical consequences are consistent both with calcium and carbon isotope data. Furthermore, the carbon release scenario can also account for oxygen isotope evidence for dramatic and protracted global warming as well as paleontological evidence for the preferential extinction of marine animals most susceptible to acidification, warming, and anoxia.},
doi = {10.1130/B31818.1},
journal = {Geological Society of America, Bulletin},
number = 7-8,
volume = 130,
place = {United States},
year = {2018},
month = {1}
}

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