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JOURNAL ARTICLE
Mineral reactions associated with hydrocarbon paleomigration in the Huincul High, Neuquén Basin, Argentina Ana L. Rainoldi; Marta Franchini; Daniel Beaufort; Peter Mozley; Adolfo Giusiano; Cesaretti Nora; Patricia Patrier; Agnes Impiccini; Josefina Pons
Volume 127, Number 11-12 11/12 2015
GSA Bulletin (2015) 127 (11-12): 1711-1729. DOI: https://doi.org/10.1130/B31201.1 Published: November 01, 2015 Article history
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Abstract Bleaching of red beds by the migration of reducing pore fluids is a widespread phenomenon, with most previous work on the topic focused on detailed studies in the southwestern United States, and to a lesser extent Germany. Herein, we report on widespread bleaching of Cretaceous red beds in the Neuquén Basin and the relationship of this bleaching to hydrocarbon migration. In the Cerro Granito area of the Huincul High, Neuquén Basin, the basal deposits of the Neuquén Group (Candeleros and Huincul Formations) are bleached. This alteration was apparently controlled by fluid and host-rock composition as well as by the intensity and span of the fluid-rock interaction. Red, fine-grained sandstones and mudstones of the Candeleros Formation were deposited in fluvial and swamp environments and contain authigenic hematite, Na-rich corrensite, micro- and mesoquartz, calcite, and analcite. Coarse-grained sandstones and mudstones of the Huincul Formation, which overlie the Candeleros Formation, were deposited in a braided fluvial system, under more humid and acidic conditions than the Candeleros Formation. Sandstones are similar in composition and texture to the Candeleros sandstones, except they contain less basic volcanic detritus and lack corrensite. Bleached facies in both formations contain bitumen and clusters of calcite + bitumen concretions, and partially dissolved detrital clasts and most cements, including early Fe-oxides, which resulted in an increase in secondary porosity and bleaching of the red beds. Alteration of the Candeleros Formation is confined to medium- to coarse-grained sandstone in which corrensite is partially dissolved and its interlayer charge is satisfied by Ca instead of Na, as in corrensite from the red sandstones. Extensive dissolution occurred in the Huincul Formation, which favored the precipitation of new authigenic minerals such as smectite, mixedlayer chlorite-smectite, and pyrite. Bleaching and associated alteration most likely resulted from interaction of hydrocarbons with the red beds. Hydrocarbon paleomigration in the Cerro Granito area occurred in higher-permeability portions of the Candeleros and Huincul Formations. The seal provided by the Lisandro Formation was breached during uplift driven by Tertiary tectonism, resulting in the exhumation of the Huincul and Candeleros Formations. This study highlights the importance of a variety of alterations, including complex clay mineral paragenesis, contemporaneous with bleaching of the red beds. Such alterations can potentially be used to provide evidence for the passage of chemically reducing fluids associated with hydrocarbons in other regions, including cases where the original red color has been completely removed.
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Index Terms/Descriptors Argentina authigenic minerals bleaching clastic rocks clay minerals Cretaceous depositional environment diagenesis early diagenesis fluvial environment hematite hydrocarbons
Latitude & Longitude lithostratigraphy Mesozoic S40°00'00" - S39°00'00", W70°00'00" - W68°00'00" migration modal analysis mudstone Neuquen Basin View Full GeoRef Record Neuquen Group organic compounds oxides POWERED BY paludal environment petrography petroleum
Citing articles via
provenance red beds Web Of Science (1) sandstone Google Scholar CrossRef sedimentary rocks sheet silicates silicates
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