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

作　　者：Xianguo Lang Zhouqiao Zhao Haoran Ma Kangjun Huang Songzhuo Li Chuanming Zhou Shuhai Xiao Yongbo Peng Yonggang Liu Wenbo Tang Bing Shen 

机构地区：[1]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,and Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China [2]Key Laboratory of Orogenic Belts and Crustal Evolution of the Ministry of Education,and School of Earth and Space Science,Peking University,Beijing 100871,China [3]State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,and Center for Excellence in Life and Palaeoenvironment,Chinese Academy of Sciences,Nanjing 2100018,China [4]School of Physics,Peking University,Beijing 100871,China [5]State Key Laboratory of Continental Dynamics,Northwest University,Xi'an710069,China [6]Shaanxi Key Laboratory of Early Life and Environments,Department of Geology,Northwest University,Xi'an 710069,China [7]Department of Geosciences,Virginia Polytechnic Institute and State University,Blacksburg,VA 24061,USA [8]International Center for Isotope Effect Research,Nanjing University,Nanjing 210023,China [9]School of Earth Sciences and Engineering,Nanjing University,Nanjing 210923,China [10]School of Mathematical and Statistical Sciences,Arizona State University,Tempe,AZ S5287,USA

出　　处：《National Science Review》2021年第10期96-109,共14页国家科学评论（英文版）

基　　金：supported by the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(XDB18000000);the National Natural Science Foundation of China(41802024,41973008,42072334 and 41322021);funded by the National Science Foundation(EAR-2021207)。

摘　　要：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^(34)Spy)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 ^(34)S-enriched H_(2)S supplied from sulfidic(H_(2)S rich)seawater.Instructed by a novel sulfur-cycling model,we propose that the emission of ^(34)S-depleted volatile organosulfur compounds(VOSC)that were generated via sulfide methylation may have contributed to the formation of ^(34)S-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.

关 键 词：sulfur isotope organosulfur compound sulfur cycle CRYOGENIAN Datangpo Formation 

分 类 号：P618.51[天文地球—矿床学]