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Titolo:
Diagenesis and pore-water evolution in Permian sandstones, Gharif Formation, Sultanate of Oman
Autore:
Hartmann, BH; Ramseyer, K; Matter, A;
Indirizzi:
Univ Bern, Inst Geol, CH-3012 Bern, Switzerland Univ Bern Bern Switzerland CH-3012 Inst Geol, CH-3012 Bern, Switzerland
Titolo Testata:
JOURNAL OF SEDIMENTARY RESEARCH
fascicolo: 3, volume: 70, anno: 2000,
parte:, A
pagine: 533 - 544
SICI:
1527-1404(200005)70:3<533:DAPEIP>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
NORWEGIAN CONTINENTAL-SHELF; SOUTH-CENTRAL TEXAS; ELECTRON-MICROPROBE; BURIAL METAMORPHISM; SEDIMENTARY BASINS; NORTH-SEA; ILLITE; ORIGIN; CATHODOLUMINESCENCE; GEOCHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
74
Recensione:
Indirizzi per estratti:
Indirizzo: Hartmann, BH Univ Bern, Inst Geol, Baltzerstr 1, CH-3012 Bern, SwitzerlandUniv Bern Baltzerstr 1 Bern Switzerland CH-3012 Switzerland
Citazione:
B.H. Hartmann et al., "Diagenesis and pore-water evolution in Permian sandstones, Gharif Formation, Sultanate of Oman", J SED RES, 70(3), 2000, pp. 533-544

Abstract

Shallow-marine, coastal plain, and fluvial sediments of the Lower Permian Gharif Formation in the Interior Oman Sedimentary Basin presently range in depth from outcrop in the Huqf-Haushi area to almost 5000 m in the northwest. This large depth range results from a varied subsidence history with only minor uplift during the Late Triassic to Early Jurassic. The degree of diagenetic overprint varies, depending on burial history, Sandstone at shallow depth (<2600 m) shows intense dissolution of aluminosilicate and carbonate minerals, combined with minor kaolinite precipitation and compaction, whereas deeply buried sandstone (>2600 m) is highly compactedand tightly cemented by quartz, carbonate, and sulfate minerals, This varied diagenesis is caused by increasing temperature with burial, by surface water infiltration during the Late Triassic to Early Jurassic, basin inversion and uplift in the Late Cretaceous along the southeastern basin margin, and obduction of the Oman Mountains in the Late Cretaceous. Depositional pore water was initially of low salinity (<50 gn) with delta(18)O(SMOW) values of -0.5 to -1.5 parts per thousand in the marine Lower Gharif and 2 parts per thousand in the arid Middle and Upper Gharif, During shallow burial (Late Triassic to Early Jurassic), pore water in the three Gharif members changed to high-salinity brines (similar to 180 g/l) with delta(18)O(SMOW) values of -4 to -7 parts per thousand. Highly saline, deep-burial pore water with a heavy delta(18)O signature (0.5-5 parts per thousand)is the result of rock-water interactions in a rock-dominated system. Present pore-water compositions mainly reflect subsurface dissolution of Ara Group evaporites, precipitation of late diagenetic carbonates and sulfates, and recharge of surface water along the uplifted southeastern basin margin.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:02:07