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Ankerite
About: Ankerite is a research topic. Over the lifetime, 859 publications have been published within this topic receiving 23960 citations.
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TL;DR: Safaniya Member of the mid-Cretaceous Wasia Formation was deposited as fluvio-marine deltaic sediments in northeastern Saudi Arabia and the northwestern Arabian Gulf as mentioned in this paper.
24 citations
TL;DR: In this article, the Eocene-Oligocene dolomite concretions and beds from the Grybow and Dukla units of the Polish Outer Carpathians were studied.
24 citations
TL;DR: Although the data suggest that the leaching of SO42- from the waste rock dump could continue for about 300years, assuming no change in the rate of oxidation of sulfides, SO41- is currently not a concern in receiving surface waters as the concentration levels are below regulatory limits.
24 citations
TL;DR: In this article, the authors investigated metasomatic magnesite, siderite and ankerite mineralizations within Paleozoic sediments of the Northern Greywacke zone and its metamorphic counterpart in the crystalline "basement" (Upper Austroalpine unit) with respect to their strontium isotopic composition.
Abstract: Metasomatic magnesite, siderite and ankerite mineralizations within Paleozoic sediments of the Northern Greywacke zone and its metamorphic counterpart in the crystalline “basement” (Upper Austroalpine unit) were investigated with respect to their strontium isotopic composition. The results support a sedimentary (s.l.) model for the magnesites within Visean platform carbonates of the Veitsch nappe and an epigenetic hydrothermal model for the siderites and ankerites in Devonian platform carbonates of the Noric nappe and from Huttenberg. The Fe transporting fluids can be characterized either as magmatogene or, more probably, as metamorphogene. By increasing the stage of recrystallization and/or remobilization due to at least two later metamorphic overprints, Sr in the various ore minerals beame ± enriched in radiogenic 87Sr.
24 citations
TL;DR: Wang et al. as mentioned in this paper used a combination of thin sections, SEM, BSE, EDS, XRD, and fluid inclusion analyses to study the petrology, paragenesis, and diagenetic processes and implications for reservoir quality.
Abstract: Upper Triassic sandstones in the Ordos Basin, northern-central China, comprise tight oil reservoirs. Using a combination of thin sections, SEM, BSE, EDS, XRD, and fluid inclusion analyses, 24 core samples from 13 wells were collected to study the petrology, paragenesis, and diagenetic processes and implications for reservoir quality. Quartz cement usually occurs as overgrowths or euhedral quartz. Extensive dissolution and albitization of K-feldspar can be observed. Five types of carbonate cements, ferrocalcite, ankerite, dolomite, calcite, and siderite, occur during different diagenetic stages. Two main types of illite and 5 main habits of chlorite are observed in this study. Kaolinite mainly occurs as booklets and vermicular aggregates. Diagenetic illite, chlorite, biotite, mixed-layer illite/smectite (I/S), and other minor minerals are also observed. The diagenetic processes include compaction, alteration of volcanic materials and mica, clay mineral transformation, cementation (silica, aluminosilicate, and carbonate), and dissolution of feldspars and rock fragments. Compaction was a significant porosity-reducing agent, and the presence of carbonate cement exerts a dominant impact on the reduction of porosity. Quartz cement and authigenic clays are less important; however, it is worth mentioning that pore-lining clays are conducive to porosity preservation. In this study, most of the porosity variation is caused by a combination of compaction, carbonate cements, quartz cement, and authigenic clays. This study gives insights into diagenetic alterations within tight sandstones and has implications for reservoir quality prediction in similar settings.
24 citations