Computer Science
Scientific paper
Jul 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959gecoa..16..243s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 16, Issue 4, pp.243-277
Computer Science
2
Scientific paper
Forty-five samples of mafic rock were obtained at approximately mile intervals along two traverses across the strike of the Duluth complex. From these, spectrographic analyses of olivines, pyroxenes, and plagioclases were made. Along the Ham--Brule traverse, the concentration of elements shows strong local fluctuations but no apparent overall trend. Along the Kawishiwi traverse, the MgO, NiO and Cr 2 O 3 of the olivines show a progressive increase upward, whereas the FeO, MnO, CoO, CuO and ZrO 2 decrease upward, and the TiO 2 , V 2 O 3 and Sc 2 O 3 exhibit no consistent trend. Associated feld-spars show an upward increase in MnO and CaO; an upward decrease in MgO, FeO, CuO and Na 2 O 3 ; and an erratic variation in NiO and TiO 2 . The trends in the Kawishiwi area are just the reverse of those found in most stratified mafic igneous bodies. They perhaps are the result of multiple injections from a differentiating magma source, with each successive injection emplaced immediately beneath its predecessor. In the Ham-Brule area successive injections were probably cross-cutting, yielding erratic distribution of younger fractions along the traverse line.
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