Calcium-magnesium carbonate solid solutions from Holocene conglomerate cements and travertines in the Coast Range of California

Details Calcium-magnesium carbonate solid solutions from Holocene conglomerate cements and travertines in the Coast Range of California Calcium-magnesium carbonate solid solutions from Holocene conglomerate cements and travertines in the Coast Range of California

Jul 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..699b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 35, Issue 7, pp.699-718

Computer Science

12

Scientific paper

Two calcium-magnesium carbonate solid solutions form Holocene travertines and conglomerate cements in fresh water stream channels of the Coast Range of California. Calcite does not yield the {015} diffraction maximum. The {006} diffraction maximum is lacking over most of the range of composition of calcite. Calcite has compositions from CaCO 3 to Ca 0.5 Mg 0.5 CO 3 . Dolomite yields both the {006} and {015} diffraction maxima over its entire composition range, Ca 0.6 Mg 0.4 CO 3 to Ca 0.5 Mg 0.5 CO 3 . The Ca-Mg carbonates form in isotopic equilibrium and thermodynamic disequilibrium from dispersion of Ca 2+ -rich water into CO 3 2- -rich water within the alluvium. The stable isotope data suggest that all the Mg-rich carbonates are primary precipitates and not a result of Mg-substitution in precursor CaCO 3 . There is a correlation between C 13 and Mg content of the carbonates which predicts a 5%. fractionation of C 13 between dolomite and calcite at sedimentary temperatures. C 14 is incorporated in Ca-Mg carbonates forming from C 13 -poor meteoric waters and C 13 -rich waters from Cretaceous sediments. C 14 ages of the Ca-Mg carbonates are apparent, and cannot be corrected to absolute values. Solution rates of calcite decrease with increasing MgCO 3 content; dolomite dissolves slower than any calcite.

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