By George V. Chilingar, Harold J. Bissell and Rhodes W. Fairbridge (Eds.)
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Additional info for Carbonate Rocks: Physical and Chemical Aspects
M. m. m. m. m. m. m. m. m. Pr Ra P--B 58 glg . m. 0 * 10-6 MgC03 wt. m. m. m. m. m. m. m. m. m. m. m. CadPWz wt. 5% p-V CadPO& wt. m. m. m. 1 % MgC03 p-V p-v wt. 4 % d. wt. 7% NazO of ash wt. 2% . m. m. m. m. m. 6 % M&03 wt. m. 49 E? m. wt. g/g wt. m. wt. m. m. m. m. m. 004% $m. m. m. m. m. wt. Ca3(PO& h-G 440 MgC03 wt. rn. m. MgCO3wt. wt. m. 85 % wt. m. wt. m. of ash S,h-V S,h-V 15% MgC03 of ash h-G 16% MgC03 wt. m. m. m. d. wt. wt. m. m. 12% 50% s,h-V CadP04h wt. m. m. d. wt. d. wt. Pr Ra P-B 78 .
This can be shown, for example, in the case of gastropods and pelecypods in which the presence of a few percent of calcite results in a distinct increase in Mg content. A similar relationship occurs in the annelids in which serpulid tubes are composed of calcite, aragonite, or a mixture of the two. The aragonite content 60 K. H. WOLF, G. V. CHlLlKGAR AND F. W. BEALES increases with increasing temperature (LOWENSTAM, 1954b). Hence, the Mg content of the whole tube increases with higher environmental temperatures to a certain point due to the increase of Mg content in the calcite portion of the tube.
1962). Rare carbonate minerals are not discussed in this chapter although they most certainly will be of definite interest in future petrologic studies: in particular those concerning diagenesis. ALDERMAN (1959), for example, pointed out that huntite (CaMg3 (C03)4), which usually forms as a weathering product of dolomite and magnesite, may prove to be more widespread than is generally assumed. Minor and trace elements in carbonate minerals According to DEERet al. ); (3) dolomite-Fe2+, Mn, Pb, Co, Ba, Zn, Ca, replacing Mg; less commonly Mn, FeyPb, and Mg substituting for Ca; ( 4 ) ankerite-Fez+, Mn; (5) siderite-Mn, Mg, Ca, Zn, Co; (6) magnesite-Fez+, Ca, Mn, Ni, Co, Zn; (7) rhodochrosite-Ca, Fez+, Mg, Zn, Co, Cd; (8) strontianite-Ca; and (9) witherite-Ca, Mg.