Journal ArticleDOI
Monohydrocalcite, hydromagnesite, nesquehonite, dolomite, aragonite, and calcite in speleothems of the Fränkische Schweiz, Western Germany
Reinhard Fischbeck,German Müller +1 more
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TLDR
The formation of calcite, aragonite, dolomite, hydromagnesite, and nesquehonite in speleothems of a small cave within dolostone may be compared with the formation of these carbonate minerals in much larger environments in which evaporation exceeds precipitation as discussed by the authors.Abstract:
The formation of calcite, aragonite, dolomite, hydromagnesite, and nesquehonite in speleothems of a small cave within dolostone may be compared with the formation of these carbonate minerals in much larger environments in which evaporation exceeds precipitation (salt lakes, tropical lagoons, sebkhas etc...). In all cases the formation and diagenetic alteration is mainly governed by the Mg/Ca-ratio of the solutions, from which precipitation (or transformation) takes place.read more
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Mg/Ca Ratio and Salinity; Two Controls over Crystallization of Dolomite
Robert L. Folk,Lynton S. Land +1 more
TL;DR: In the case of carbonate precipitation, both thermodynamic and kinetic considerations are taken into account as discussed by the authors, where the concentration and ionic composition of natural solutions influence not only the mineralogy of the precipitate, but also the crystal size and habit of both metastable and stable phases.
Journal ArticleDOI
Formation and diagenesis of inorganic Ca−Mg carbonates in the lacustrine environment
TL;DR: In this article, the formation of primary carbonate minerals (calcite, high-Mg calcite, aragonite, hydrous Mg carbonates) and secondary carbonates (dolomite, huntite and magnesite), as determined from 25 lakes with differing hydrochemistry and salinity, is dependent on the Mg/Ca ratio of the lake or pore water.
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Quaternary pedogenic calcretes from the Kalahari (southern Africa): mineralogy, genesis and diagenesis
TL;DR: In this paper, a pedogenic/diagenetic model for calcite cementation in the Kalahari is presented, based on the descriptive morphological terminology of Netterberg and a differentiation into simple and composite profiles is made.
Journal ArticleDOI
Hydrological evolution during the last 15 kyr in the Tso Kar lake basin (Ladakh, India), derived from geomorphological, sedimentological and palynological records
Bernd Wünnemann,Bernd Wünnemann,Dieter Demske,Pavel E. Tarasov,Bahadur Singh Kotlia,Christian Reinhardt,Jan Bloemendal,Bernhard Diekmann,Kai Hartmann,Joachim Krois,Frank Riedel,Nidhi Arya +11 more
TL;DR: The Tso Kar lake basin in Ladakh, northwestern Himalayas (33°18′N, 78°E, 4527m a.s.a.s) is located close to the modern boundary of effective moisture transport from the Indian summer monsoon as mentioned in this paper.
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The mineral diversity of Jezero crater: Evidence for possible lacustrine carbonates on Mars
TL;DR: In this paper, a detailed investigation of the mineralogical and morphological properties of geological units within Jezero crater was conducted to better constrain the origin of carbonates in the basin and their timing relative to fluvio-lacustrine activity.
References
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Journal ArticleDOI
A crystallographic study of vertebrate otoliths
TL;DR: The distribution of statoliths and/or statoconia, their texture and their composition within the vertebrate series, show remarkable consistencies; within each class the same kind of static bodies is usually present.
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Hydrocalcite (CaCO3 * H2O) and Nesquehonite (MgCO3 * 3H2O) in Carbonate Scales.
TL;DR: From the conditions under which hydrocalcite is transformed into calcite and aragonites, it appears that in some cases aragonite in nature may be formed by way of an intermediary of CaCO3 • H2O.
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Étude du Mondmilch de la grotte de la Clamouse et de quelques carbonates et hydrocarbonates alcalino-terreux
TL;DR: In this article, auteurs indiquent les especes minerales which constituent en general ces concretions : hydroma-gnesite, calcite, and huntite.