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首页> 外文期刊>Journal of Asian earth sciences >Superheavy pyrite in the Upper Cretaceous mudstone of the Songliao Basin, NE China and its implication for paleolimnological environments
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Superheavy pyrite in the Upper Cretaceous mudstone of the Songliao Basin, NE China and its implication for paleolimnological environments

机译：中国东北松辽盆地上白垩统泥岩中的超重黄铁矿及其对古岩相环境的意义

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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.
机译：松辽盆地上白垩统嫩江组广泛发育的深色泥岩是重建古环境的天然档案。嫩江组的时间序列硫同位素研究表明，相对于嫩江下部I和底嫩江成员II的同时代海相硫酸盐，古湖的自生黄铁矿富含S-34。必须解释富含S-34的黄铁矿的发生，以了解这一时期的古湖泊环境和硫循环，对此可以作一些解释。基于对超重黄铁矿形成的各种机制的比较，我们认为最可能的情况是古湖中存在厌氧硫酸盐最小区域（SMZ）。在该区域中，硫酸盐通过微生物硫酸盐还原（MSR）富集在34S中，这种重硫酸盐成为孔隙水或底部水的来源，从中产生了超重的黄铁矿。嫩江组超重黄铁矿形成的概念模型表明，嫩江组不同沉积阶段SMZ的分布范围是可变的。这些变化可能与大陆风化的硫酸盐的连续输入有关，这导致硫酸盐的部分混合和嫩江基底二期SMZ的衰减。

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    《Journal of Asian earth sciences》 |2020年第3期|104156.1-104156.9|共9页
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    Guangdong Ocean Univ Guangdong Prov Key Lab Coastal Ocean Variat & Dis Zhanjiang 524088 Peoples R China|Guangdong Ocean Univ Coll Ocean & Meteorol Zhanjiang 524088 Peoples R China;

    Jilin Univ Construct Engn Coll Changchun 130000 Peoples R China|Drilling & Exploitat Technol Oil Shale Natl Local Joint Engn Lab In Situ Convers Changchun 130021 Jilin Peoples R China|Jilin Univ Coll Earth Sci Changchun 130061 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Superheavy pyrite; Sulfur isotope; Nenjiang Formation; Songliao Basin;

    机译：黄铁矿超重;硫同位素嫩江组松辽盆地;

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