地中海东南部冷渗自生碳酸盐的赋存与成因

IF 1.9 3区 地球科学 Q1 GEOLOGY Depositional Record Pub Date : 2023-06-22 DOI:10.1002/dep2.239
R. Weidlich, O. M. Bialik, A. Rüggeberg, B. Grobéty, T. Vennemann, A. Neuman, Y. Makovsky, A. Foubert
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引用次数: 0

摘要

甲烷衍生的自生渗碳酸盐岩分布在全球大陆边缘。这些碳酸盐岩是识别渗流动力学、富甲烷上升流体来源及其时间的重要档案,也是重要的固碳机制。最近,在地中海东南部黎凡特盆地发现了渗漏碳酸盐岩。为了阐明整个盆地过去的渗流活动和动力学,基于远程操作车辆数据,从黎凡特盆地提取了不同的渗透碳酸盐形态(烟囱、地壳和路面),并使用标准沉积物岩相学技术、x射线衍射和稳定碳氧同位素分析进行了分析。碳酸盐烟囱由泥晶(δ13CVPDB为- 10‰~ +5‰)、分散的重晶石和白云石晶体、扇形文石(δ13CVPDB为- 52‰~ - 30‰)和高镁方解石胶结物组成,后者通常由低镁方解石球粒生长而成。低镁方解石胶结物在小空腔中形成。碳酸盐岩结壳由泥晶、低镁方解石角砾岩、高镁方解石结核(δ13CVPDB为- 35‰~ - 20‰)和胶结物组成,部分取代了扇形文石胶结物。碳酸盐岩路面由低镁方解石、微晶白云石和高镁方解石组成。扇形文石局部以孔衬水泥形式存在。氧化铁常被包裹在低镁方解石、高镁方解石和白云石胶结物中。以大量高镁方解石和文石为特征的烟囱和地壳被解释为是通过平流甲烷通量形成的。含有大量白云石的路面被解释为扩散的甲烷通量的产物。对不同碳酸盐形态和胶结物相的沉积物岩相学和地球化学分析表明,在各个阶段的降水过程中,流体通量上升以及与海洋孔隙水和(或)海水混合的模式各不相同。
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Occurrence and Genesis of Cold-Seep Authigenic Carbonates from the South-Eastern Mediterranean Sea

Methane-derived authigenic seep carbonates occur globally along continental margins. These carbonates are important archives to identify seep dynamics, the source of the ascending methane-enriched fluids together with their timing, and are an important carbon sequestration mechanism. Recently, seep carbonates were discovered in the Levant Basin in the south-eastern Mediterranean Sea. To elucidate past seepage activity and dynamics across the basin, different seep carbonate morphologies (chimneys, crusts and pavements) retrieved from the Levant Basin were mapped based on remotely operating vehicle data and analysed using standard sediment petrographic techniques, X-ray diffraction and stable carbon and oxygen isotope analyses. Carbonate chimneys consist of micrite (δ13CVPDB of −10‰ to +5‰) with dispersed baryte and dolomite crystals, fan-shaped aragonite (δ13CVPDB of −52‰ to −30‰) and high-magnesium calcite cements, with the latter often growing from low-magnesium calcite spherules. Botryoidal low-magnesium calcite cements are forming in small cavities. Carbonate crusts consist of micrite with low-magnesium calcite breccias, high-magnesium calcite nodules (δ13CVPDB of −35‰ to −20‰) and cements, and partially replaced fan-shaped aragonite cements. Carbonate pavements consist of low-magnesium calcite microsparite, micritic dolomite and high-magnesium calcite. Fan-shaped aragonite is locally present as pore-lining cement. Iron oxides are often seen coating the low-magnesium calcite, high-magnesium calcite and dolomite cements. Chimneys and crusts, characterised by high amounts of high-magnesium calcite and aragonite, are interpreted to have formed through advective methane fluxes. Pavements, with high quantities of dolomite, are explained as the product of diffusive methane flux. Sediment petrographic and geochemical analysis of the different carbonate morphologies and cement phases therein witness distinct modes of ascending fluid fluxes and their mixing with marine pore water and/or sea water during precipitation of the individual phases.

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来源期刊
CiteScore
4.10
自引率
16.70%
发文量
42
审稿时长
16 weeks
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