Dataset Information

Cracking the superheavy pyrite enigma: possible roles of volatile organosulfur compound emission.

ABSTRACT: The global deposition of superheavy pyrite (pyrite isotopically heavier than coeval seawater sulfate in the Neoproterozoic Era and particularly in the Cryogenian Period) defies explanation using the canonical marine sulfur cycle system. Here we report petrographic and sulfur isotopic data (δ³⁴S_py) of superheavy pyrite from the Cryogenian Datangpo Formation (660-650 Ma) in South China. Our data indicate a syndepositional/early diagenetic origin of the Datangpo superheavy pyrite, with ³⁴S-enriched H₂S supplied from sulfidic (H₂S rich) seawater. Instructed by a novel sulfur-cycling model, we propose that the emission of ³⁴S-depleted volatile organosulfur compounds (VOSC) that were generated via sulfide methylation may have contributed to the formation of ³⁴S-enriched sulfidic seawater and superheavy pyrite. The global emission of VOSC may be attributed to enhanced organic matter production after the Sturtian glaciation in the context of widespread sulfidic conditions. These findings demonstrate that VOSC cycling is an important component of the sulfur cycle in Proterozoic oceans.

SUBMITTER: Lang X

PROVIDER: S-EPMC8566178 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature

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Cracking the superheavy pyrite enigma: possible roles of volatile organosulfur compound emission.

Lang Xianguo X Zhao Zhouqiao Z Ma Haoran H Huang Kangjun K Li Songzhuo S Zhou Chuanming C Xiao Shuhai S Peng Yongbo Y Liu Yonggang Y Tang Wenbo W Shen Bing B

National science review 20210301 10

The global deposition of superheavy pyrite (pyrite isotopically heavier than coeval seawater sulfate in the Neoproterozoic Era and particularly in the Cryogenian Period) defies explanation using the canonical marine sulfur cycle system. Here we report petrographic and sulfur isotopic data (δ<sup>34</sup>S<sub>py</sub>) of superheavy pyrite from the Cryogenian Datangpo Formation (660-650 Ma) in South China. Our data indicate a syndepositional/early diagenetic origin of the Datangpo superheavy pyr ...[more]

PMID: 34858606

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Project description:Rapid Arctic warming, a lengthening growing season, and the increasing abundance of biogenic volatile-organic-compound-emitting shrubs are all anticipated to increase atmospheric biogenic volatile organic compounds (BVOCs) in the Arctic atmosphere, with implications for atmospheric oxidation processes and climate feedbacks. Quantifying these changes requires an accurate understanding of the underlying processes driving BVOC emissions in the Arctic. While boreal ecosystems have been widely studied, little attention has been paid to Arctic tundra environments. Here, we report terpenoid (isoprene, monoterpenes, and sesquiterpenes) ambient mixing ratios and emission rates from key dominant vegetation species at Toolik Field Station (TFS; 68°38' N, 149°36' W) in northern Alaska during two back-to-back field campaigns (summers of 2018 and 2019) covering the entire growing season. Isoprene ambient mixing ratios observed at TFS fell within the range of values reported in the Eurasian taiga (0-500 parts per trillion by volume - pptv), while monoterpene and sesquiterpene ambient mixing ratios were respectively close to and below the instrumental quantification limit (~ 2 pptv). Isoprene surface emission rates ranged from 0.2 to 2250 μgC m-2 h-1 (mean of 85 μgC m-2 h-1) and monoterpene emission rates remained, on average, below 1 μgC m-2 h-1 over the course of the study. We further quantified the temperature dependence of isoprene emissions from local vegetation, including Salix spp. (a known isoprene emitter), and compared the results to predictions from the Model of Emissions of Gases and Aerosols from Nature version 2.1 (MEGAN2.1). Our observations suggest a 180 %-215 % emission increase in response to a 3-4°C warming, and the MEGAN2.1 temperature algorithm exhibits a close fit with observations for enclosure temperatures in the 0-30°C range. The data presented here provide a baseline for investigating future changes in the BVOC emission potential of the under-studied Arctic tundra environment.

Dataset Information

Cracking the superheavy pyrite enigma: possible roles of volatile organosulfur compound emission.

Publications

Cracking the superheavy pyrite enigma: possible roles of volatile organosulfur compound emission.

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