Link between aluminum mobility and destruction of secondary porosity

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doi: 10.1306/03B5AD22-16D1-11D7-8645000102C1865D
Authors:Curtis, C. D.
Author Affiliations:Primary:
The Univ. Sheffield, Dep. Geol., Sheffield, United Kingdom
Volume Title:AAPG Bulletin
Source:AAPG Bulletin, 67(3), p.380-384. Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States. ISSN: 0149-1423
Publication Date:1983
Note:In English. 23 refs.; illus.
Summary:Acid pore waters generated within organic-rich muds destabilize carbonates and aluminosilicates and take metals, including aluminum, into solution. Sediment compaction forces some of these modified pore waters into sandstones. Once isolated from the principal source of acidity (kerogen maturation), the pH of these solutions must rise as further mineral dissolution occurs. The inevitable consequence is precipitation of kaolinite, even though solutions may still be acid. This explains why kaolinite is commonly the first precipitate to reduce secondary pore space in sandstones and can form even as other minerals are being dissolved away.—Journal abstract. [R.A.H.]
Subjects:Acidic composition; Aluminum; Authigenesis; Calcium carbonate; Clastic rocks; Clastic sediments; Clay; Clay minerals; Diagenesis; Geochemistry; Kaolinite; Kaolinization; Metals; Metasomatism; Pore water; Porosity; Processes; Sandstone; Secondary porosity; Sedimentary petrology; Sedimentary rocks; Sedimentation; Sediments; Sheet silicates; Silicates
Abstract Numbers:84M/4445
Record ID:1984014049
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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