2 Works

Magnesium and calcium isotope fractionation during microbial dolomite formation

Michael Tatzel , Adina Paytan , Samantha Carter , Daniel A. Frick , Francisca Martinez-Ruiz , Zach A. DiLoreto , Maria Dittrich , Tomaso R. R. Bontognali & Mónica Sanchez-Román
Microbial mediation is considered an important process for the formation of primary dolomite at ambient temperature. Yet, no structural, mineralogical, chemical or isotopic means exist to discern this mode of dolomite formation from secondary dolomite. To explore the utility of metal isotopes in allowing this distinction we characterize magnesium and calcium stable isotope ratios in primary (proto)dolomites from a modern hypersaline environment. Samples from the Khor Al-Adaid sabkhas in Qatar show consistent isotopic differences of...

Unraveling Zechstein 3 Anhydrite Structuration and possible implications for Geo-Drilling Hazards

Ward Teertstra & Guido Hoetz
VU Amsterdam, Netherlands (1); EBN, Netherlands, The (2) Anhydrites Carbonates of the Leine formation, the third evaporitic cycle of the Zechstein group, are widely distributed in the Southern Permian basin. These strata are often drilled through by wells targeting underlying Rotliegend gas prospects. The ZEZ3C/A members constitute brittle rocks sandwiched by the ductile halites from the underlying ZEZ2H and the overlying ZEZ3H. The brittle sheet is frequently rifted (boudinage) and the resulting fragments are often...

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