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Journal Article
Published: 11 January 2018
Journal of Environmental and Engineering Geophysics (2018) 22 (4): 411-420.
..., which consists of gypsum/anhydrite and is highly susceptible to dissolution and karstification. Manifestations of karst within the Castile outcrop are abundant and include sinkholes, subsidence features and caves, both epigene and hypogene in origin.Land reconnaissance surveys conducted during 2015...
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Journal Article
Published: 01 November 2017
Clays and Clay Minerals (2017) 65 (5): 310-328.
... due to differences in mineral fractionations. The δ34S and δ18O values and 87Sr/86Sr isotope ratios for gypsum suggest an intensely evaporitic lacustrine environment fed by an older marine evaporitic source. The Si, Al, Mg, Ca, and enhanced TOT/C required for periodic precipitation of organicrich...
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Journal Article
Journal: GSA Bulletin
Published: 06 July 2017
GSA Bulletin (2017) 129 (11-12): 1636-1659.
..., with scarce speleothem occurrences. Gypsum crusts with δ34SSO4 values lower than other sulfate deposits point to bacterial sulfur reduction, hydrogen sulfide, and sulfuric acid being involved in the speleogenesis. TABLE 1. STABLE ISOTOPE RESULTS OF CAVE DEPOSITS IN THE JUDEAN DESERT...
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Series: GSA Field Guide
Published: 01 January 2016
DOI: 10.1130/2016.0044(03)
EISBN: 9780813756448
... of the Lykins Formation in exposures where the Blaine Gypsum Member has been dissolved. For example, note the higher stratigraphic position of the Forelle Member in sections F13 and F11-F9, where this unit is often only known from core or quarries. To the south, the upper Lykins Formation and overlying Jelm...
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Series: GSA Special Papers
Published: 01 December 2011
DOI: 10.1130/2011.2483(14)
... The Jurassic Todilto Formation of NW New Mexico and SW Colorado, USA, has utility as an analog of Martian flood evaporites. The Todilto Formation is a concentrically and vertically zoned carbonate (calcite with minor late dolomite) to sulfate (gypsum) evaporite deposit that developed over...
Series: GSA Special Papers
Published: 01 December 2011
DOI: 10.1130/2011.2483(18)
... on Mars. Measured pH values of condensed volcanic vapors range from −1 to 5, and near-surface temperatures in the fumaroles range from 40 to 400 °C. In a few years, fresh basalt can weather to amorphous silica and gypsum, along with lesser amounts of other sulfates (natroalunite and jarosite), Fe...
Series: GSA Special Papers
Published: 01 May 2009
DOI: 10.1130/2009.2450(03)
... are upward-coarsening sequences of laminated mud, silt, and sand. A major drop in lake level occurred ca. 18 ka, resulting in subaerial exposure of the lake floor in areas now covered by over 40 m of water. The subaerial surfaces are indicated by root casts and gypsum-rich soil features. Bear Lake remained...
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2006.2420(09)
... Detrital evaporites and mixed siliciclastic-gypsum arenites are present in the Gessi Formation from the Rossano Basin in Calabria, Italy. The detrital origin of the gypsum fragments in the quartzofeldspathic sandstones is revealed by crystal overgrowths that outline the shape of former gypsum...