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首页> 外文期刊>Arabian journal of geosciences >Biomarkers and inorganic geochemical elements of Late Jurassic-Early Cretaceous limestone sediments from Banik Village in the Kurdistan Region, Northern Iraq: implications for origin of organic matter and depositional environment conditions
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Biomarkers and inorganic geochemical elements of Late Jurassic-Early Cretaceous limestone sediments from Banik Village in the Kurdistan Region, Northern Iraq: implications for origin of organic matter and depositional environment conditions

机译：伊拉克北部库尔德斯坦地区Banik村晚侏罗世-早白垩世石灰岩沉积物的生物标志物和无机地球化学元素：对有机质起源和沉积环境条件的影响

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摘要

Late Jurassic-Early Cretaceous limestone sediments from Banik Village in the Kurdistan Region, Northern Iraq, were analysed based on a combined investigation of elemental composition and biomarker characterisation. These investigations were used to define the origin, type of organic matters and their relation to the environment conditions during deposition. The bulk geochemical characteristics indicated that the Late Jurassic-Early Cretaceous limestone sediments were deposited in a marine environment with calcium-rich seawater. Their biomarkers provide evidence for a major contribution by aquatic organic matter with a minor terrigenous organic matter contribution. This is confirmed by normal alkanes, hopanoids, steroids and related compounds of the saturated hydrocarbons. Moreover, the salinity stratification and relatively reducing bottom water conditions are evidenced in the Late Jurassic-Early Cretaceous limestone sediments, as identified from Sr/Br, V/Ni and Pr/Ph ratios. The occurrence of gammacerane biomarker in the analysed samples is also a strong indicator of reducing and salinity stratification during deposition. Therefore, a stratified water column with salinity and relatively anoxic bottom water conditions contribute to organic matter (OM) preservation.
机译：基于元素组成和生物标志物特征的综合研究，分析了伊拉克北部库尔德斯坦地区Banik村的侏罗纪-早白垩纪晚期石灰岩沉积物。这些调查用于确定沉积过程中有机物的来源，类型及其与环境条件的关系。整体地球化学特征表明，侏罗纪-早白垩世晚期石灰岩沉积物沉积在海洋环境中，富含钙的海水。他们的生物标志物提供了水生有机物的主要贡献和次生陆源有机物的贡献的证据。正常的烷烃，类胡萝卜素，类固醇和饱和烃的相关化合物证实了这一点。此外，从Sr / Br，V / Ni和Pr / Ph比确定，晚侏罗世-早白垩世石灰岩沉积物中有盐分分层和相对减少的底水条件。所分析样品中γ-甘油的生物标志物的出现也是沉积过程中盐分和盐分分层的有力指标。因此，具有盐度和相对缺氧的底水条件的分层水柱有助于有机物（OM）的保存。

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