文献类型：期刊文献

英文题名：Superheavy pyrite in the Upper Cretaceous mudstone of the Songliao Basin, NE China and its implication for paleolimnological environments

作者：Cao, Hansheng[1,2];He, Wentong[3,4,5];Chen, Fajin[1,2];Kong, Deming[1,2]

机构：[1]Guangdong Ocean Univ, Guangdong Prov Key Lab Coastal Ocean Variat & Dis, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China;[3]Jilin Univ, Construct Engn Coll, Changchun 130000, Peoples R China;[4]Drilling & Exploitat Technol Oil Shale, Natl Local Joint Engn Lab In Situ Convers, Changchun 130021, Jilin, Peoples R China;[5]Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China

年份：2020

卷号：189

外文期刊名：JOURNAL OF ASIAN EARTH SCIENCES

收录：SCI-EXPANDED(收录号：WOS:000510956800014)、、Scopus(收录号：2-s2.0-85076573296)、WOS

基金：This research was supported by the National Natural Science Foundation of China (NSFC), China (41903067), the Project of Enhancing School with Innovation of Deparment of Education of Guangdong Province, China (230419079), the Project of Enhancing School with Innovation of Guangdong Ocean University, China (GDOU2016050260), Self-determined Foundation of Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province, China (YYY-ZZ-18-03) and Marine Science Research Team Project of Guangdong Ocean University, China (002026002004). We are very grateful for painstaking efforts of two anonymous reviewers and Prof. Khin Zaw which significantly improved quality of the manuscript.

语种：英文

外文关键词：Superheavy pyrite; Sulfur isotope; Nenjiang Formation; Songliao Basin

外文摘要：The widely developed dark mudstone in the Upper Cretaceous Nenjiang Formation of the Songliao Basin is a natural archive for reconstructing the palaeoenvironment. A time series sulfur isotope study on the Nenjiang Formation reveals that authigenic pyrite from the paleo-lake is enriched in S-34 relative to coeval marine sulfate in the lower Nenjiang Member I and basal Nenjiang Member II. The occurrence of S-34-enriched pyrite must be explained to understand the paleolimnological environment and the sulfur cycling during this period, for which several explanations can be advanced. Based on a comparison of various mechanisms for superheavy pyrite formation, we consider the presence of an anaerobic sulfate minimum zone (SMZ) in the paleo-lake as the most likely scenario. In this zone, sulfate was enriched in 34S through microbial sulfate reduction (MSR), and this heavy sulfate became the source for pore water or bottom water, from which superheavy pyrite was produced. The conceptual model for formation of the superheavy pyrite in the Nenjiang Formation indicates that the distribution range of the SMZ was variable in the different sedimentary stages of the Nenjiang Formation. These variations were likely related to successive inputs of sulfate from continental weathering, which led to partial mixing of sulfate and attenuation of the SMZ in the basal Nenjiang Member II.