盆地演化过程中的错构控制热液白云石化和胶结作用:上三叠统碳酸盐岩,阿联酋

Geology Pub Date : 2024-03-21 DOI:10.1130/g51990.1
H. Mansurbeg, M. Alsuwaidi, D. Morad, S. Morad, M. Tiepolo, S. Shahrokhi, I. Al-Aasm, H. Koyi
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引用次数: 0

摘要

通过对上三叠统白云岩、鞍状白云岩以及石英和方解石胶结物进行岩相学、流体包裹微测温、稳定同位素分析和放射性(206Pb/238U)测年,结合阿拉伯联合酋长国北部盆地的构造演化,确定了白云岩化和胶结的时间和条件。白云石化(约152.4Ma)和鞍状白云石(约146.8Ma)、方解石(约144.6Ma)以及石英胶结物的沉淀归因于热的基底盐水集中同步流向晶粒支撑的灰岩,其中的渗透性因陨石水侵入断裂面下而增强。另一种方解石胶结物(约 99.7 Ma)是在晚白垩世阿曼蛇绿混杂岩俯冲相关的构造压缩过程中由热盐水流形成的。因此,本文为以下方面提供了新的见解:(1) 热液(热基底盐水)白云石化的地层控制和时间;(2) 密切相关的构造内灰岩和白云石的起源;(3) 沉积盆地构造演化过程中基底盐水的成岩作用和热化学改造之间的联系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Disconformity-controlled hydrothermal dolomitization and cementation during basin evolution: Upper Triassic carbonates, UAE
Petrography, fluid-inclusion microthermometry, stable isotope analyses, and radiometric (206Pb/238U) dating of Upper Triassic dolostones, saddle dolomite, and quartz and calcite cements were used to constrain the timing and conditions of dolomitization and cementation in the context of the tectonic evolution of a basin in the northern United Arab Emirates. Dolomitization (ca. 152.4 Ma) and precipitation of saddle dolomite (ca. 146.8 Ma), calcite (ca. 144.6 Ma), and quartz cements are attributed to focused synrifting flow of hot basinal brines into grain-supported limestones in which permeability was enhanced by incursion of meteoric waters beneath a disconformity surface. Another calcite cement generation (ca. 99.7 Ma) was formed by flow of hot brines during tectonic compression related to the obduction of Oman ophiolites in the Late Cretaceous. Thus, this paper provides new insights into (1) stratigraphic controls on and timing of hydrothermal (hot basinal brines) dolomitization, (2) the origin of closely associated intraformational limestones and dolostones, and (3) linkages between diagenesis and thermochemical modifications of basinal brines during tectonic evolution of sedimentary basins.
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