下寒武统页岩的初级生产、稀释和保存对有机质积累的影响

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS
Jin Chai, Ruifei Wang, Sen Zheng
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引用次数: 0

摘要

为了研究初级生产、稀释和保存对有机质积累的影响,研究人员提供了寒武纪牛塘地层富含有机质页岩的初级生产、碎屑流入和氧化还原条件的地球化学数据和地球化学代用指标。原生产状代用指标(TOC、Mo、P、Ba 和 Babio)和氧化还原代用指标(Ni/Co、V/Cr、U/Al 和 Th/U)表明,牛底塘组富有机质黑色页岩沉积于缺氧/缺氧条件下,原生产状较高。牛池塘地层的黄铁矿由球形框架体组成,表明牛池塘地层沉积过程中有机质降解前底层水缺氧并不普遍。高初级生产力增加了进入化学跃层和底层水的有机碳通量,微生物耗氧和有机质降解导致底层水缺氧。缺氧底层水反过来又有利于有机物的保存。此外,Ti/Al 比值与牛泥塘地层的 TOC 含量有很好的相关性,表明碎屑岩的输入提高了牛泥塘地层沉积过程中防止有机质降解的埋藏率。因此,牛池塘地层有机质的积累主要受初级生产的影响,而不是受底层水氧化还原条件的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Primary Production, Dilution and Preservation on Organic Matter Accumulation for the Lower Cambrian Shale

In order to investigate the influence of primary production, dilution and preservation on organic matter accumulation, geochemical data and geochemical proxies of primary production, clastic influx and redox conditions were presented from the Cambrian Niutitang Formation organic-rich shales. The primary production proxies (TOC, Mo, P, Ba and Babio) and redox proxies (Ni/Co, V/Cr, U/Al and Th/U) suggest that the black organic-rich shales of the Niutitang Formation are deposited in anoxic/euxinic condition with high primary production. The pyrite of the Niutitang Formation is composed of spherical framboids, indicating that the anoxic bottom water could not prevail before organic matter degradation during the Niutitang Formation deposition. High primary production enhances organic carbon flux into chemocline layer and bottom water, leading to the anoxic bottom water from oxygen consumption by microorganisms and organic matter degradation. The anoxic bottom water in turn is beneficial to preservation of organic matter. In addition, Ti/Al ratios correlate well with TOC contents through the Niutitang Formation, indicating that clastic inputs enhance the burial rate for preventing organic matter from degradation during Niutitang Formation deposition. Therefore, the accumulation of organic matter in the Niutitang Formation is mainly influenced by primary production rather than the redox conditions in bottom water.

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来源期刊
Chemistry and Technology of Fuels and Oils
Chemistry and Technology of Fuels and Oils 工程技术-工程:化工
CiteScore
0.90
自引率
16.70%
发文量
119
审稿时长
1.0 months
期刊介绍: Chemistry and Technology of Fuels and Oils publishes reports on improvements in the processing of petroleum and natural gas and cracking and refining techniques for the production of high-quality fuels, oils, greases, specialty fluids, additives and synthetics. The journal includes timely articles on the demulsification, desalting, and desulfurizing of crude oil; new flow plans for refineries; platforming, isomerization, catalytic reforming, and alkylation processes for obtaining aromatic hydrocarbons and high-octane gasoline; methods of producing ethylene, acetylene, benzene, acids, alcohols, esters, and other compounds from petroleum, as well as hydrogen from natural gas and liquid products.
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