Cementing halite in Triassic Bunter Sandstone (Tonder, Southwest Denmark) as a result of hyperfiltration of brines

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doi: 10.1016/0009-2541(89)90103-4
Authors:Laier, Troels; Nielsen, Bjarne Leth
Author Affiliations:Primary:
Geol. Surv. Denmark, Copenhagen, Denmark
Other:
Dansk Olie Gasprod., Denmark
Volume Title:Water-rock interaction
Volume Authors:Grönvold, Karl, editor
Source:Chemical Geology, 76(3-4), p.353-363; Fifth international symposium on Water-rock interaction, Reykjavik, Iceland, Aug. 8-17, 1986, edited by Karl Grönvold. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1989
Note:In English. 15 refs.; illus. incl. 4 tables, sketch map
Summary:Samples of cores from the Bunter Sandstone formation of the Tonder structure have been carefully prepared without ingress of fresh water. The presence of cementing halite has been proved by chemical analysis and studies of these samples under a microscope. Computer log analysis combined with core analysis show that the cementing halite exists mainly in the sandstone layers of the Upper Bunter sand unit. The depositional environments of the Bunter Sandstone formation are outlined. It is argued that the cementing halite formed as a result of hyperfiltration of the saturated formation brines through low-permeability layers of shale. This process took place during the emplacement of nitrogen gas in the Upper Bunter sand unit late in the diagenetic history of the sandstone. [P.Br.]
Subjects:Brines; Bunter; Cementation; Chlorides; Clastic rocks; Cores; Data processing; Diagenesis; Filtration; Halides; Halite; Lower Triassic; Mechanism; Mesozoic; Sandstone; Sedimentary petrology; Sedimentary rocks; SEM data; Triassic; Well-logging; Denmark; Europe; Scandinavia; Western Europe; Southwestern Denmark; Tonder
Abstract Numbers:90M/1861
Record ID:1989081815
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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