Disconformity-controlled hydrothermal dolomitization and cementation during basin evolution: Upper Triassic carbonates, UAE

• DOI: 10.1130/g51990.1
• Publication Date: 2024-03-21T20:00:58Z
• Authors: H. Mansurbeg; M. Alsuwaidi; D. Morad; S. Morad; M. Tiepolo; S. Shahrokhi; I.S. Al-Aasm; H. Koyi
• Keywords: Dolomitization; Cementation (geology)

Abstract Petrography, fluid-inclusion microthermometry, stable isotope analyses, and radiometric (206Pb/238U) dating of Upper Triassic dolostones, saddle dolomite, quartz calcite cements were used to constrain the timing conditions dolomitization cementation in context tectonic evolution a basin northern United Arab Emirates. Dolomitization (ca. 152.4 Ma) precipitation dolomite 146.8 Ma), 144.6 are attributed focused synrifting flow hot basinal brines into grain-supported limestones which permeability was enhanced by incursion meteoric waters beneath disconformity surface. Another cement generation 99.7 formed during compression related obduction Oman ophiolites Late Cretaceous. Thus, this paper provides new insights (1) stratigraphic controls on hydrothermal (hot brines) dolomitization, (2) origin closely associated intraformational (3) linkages between diagenesis thermochemical modifications sedimentary basins.