Imported quartz cement in aeolian sandstone grew from water of uniform composition but has complex zonation

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Authors:Sullivan, M. D.; Macaulay, C. I.; Fallick, A. E.; Haszeldine, R. S.
Author Affiliations:Primary:
University of Glasgow, Department of Geology & Applied Geology, Glasgow, United Kingdom
Scottish Universities Research & Reactor Centre, United Kingdom
Exxon Production Research Company, United States
Volume Title:Terra Nova
Source:Terra Nova, 9(5-6), p.237-241. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0954-4879
Publication Date:1997
Note:In English. 26 refs.; illus., incl. 2 tables, sketch map
Summary:The origins and volumes of waters which mass-transport silica in sedimentary basins, remain obscure. Previous analytical studies of quartz cements in sandstones have shown that they can originate from complex and variable composition fluids. By contrast, a combination of separation and analytical techniques show that, in lower Permian sandstones of the S North Sea, the cementing fluid was isotopically uniform (δ 18O = 19.6 ± 1.0% V-SMOW), producing quartz cements that exhibit complex growth zonation patterns under cathodoluminescence (CL). Petrographic data show that 8-10% quartz cement (locally 30%) was imported into this aeolian sandstone, with cement distribution controlled by depositional permeabilities. A large-scale, high-volume, flux of evolved meteoric fluid, during 2 km deep burial, is inferred, and it is shown that complex CL zonation may arise from relatively subtle changes in water composition. [J.F.]
Subsections:Sedimentary rocks
Subjects:Cementation; Clastic rocks; Crystal growth; Crystal zoning; Diagenesis; Framework silicates; Isotope ratios; Isotopes; Leman Sandstone Formation; Lower Permian; O-18/O-16; Oxygen; Paleozoic; Permian; Petroleum; Petroleum exploration; Quartz; Reservoir rocks; Sandstone; Sedimentary rocks; Silica; Silica minerals; Silicates; Stable isotopes; Atlantic Ocean; North Atlantic; North Sea
Coordinates:N530000 N531000 E0022000 E0020000
Abstract Numbers:99M/586
Record ID:1998070951
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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