On the Formation and Occurrence of Saddle Dolomite. Discussion
In their paper on saddle dolomite (M.A. 81-3218), Radke & Mathis suggested that at T > 60°C, sulphate-reducing conditions and pyroelectric effects due to fluctuating T seem to favour the formation of these distorted dolomite crystals. In laboratory experiments Gregg produced saddle dolomite by reacting aragonite pelecypod fragments with MgCl2 solution containing Ca ions at 260°C for 23 hr and longer. These results demonstrate that neither sulphate-reducing conditions nor fluctuating T are necessary, although the exact role of T in distorting the dolomite lattice remains unknown.
J. M. Gregg, "On the Formation and Occurrence of Saddle Dolomite. Discussion," Journal of Sedimentary Petrology, vol. 53, no. 3, pp. 1025-1026, Society of Economic Paleontologists and Mineralogists, Sep 1983.
The definitive version is available at http://dx.doi.org/10.1306/212F830F-2B24-11D7-8648000102C1865D
Geosciences and Geological and Petroleum Engineering
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