Computer Science
Scientific paper
Mar 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31..431p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 3, pp.431-450
Computer Science
Scientific paper
To provide information upon the distribution of minor metals in a relatively welldefined and chemically simple granitic body, rock samples were collected at 151 grid localities on the Rooky Hill granodiorite stock 12 miles southeast of Visalia, Tulare County, California. This stock is texturally-zoned and modal analyses made of 32 selectively stained rock slabs from the two textural facies indicate that within-hand-specimen variation constitutes a large portion of the total modal variation observed in each textural facies, and in the rim-facies even exceeds the variation between rock samples for all minerals except quartz. However, significant differences of mean modal contents between the two facies appear to exist. The rim-facies rocks are characterized by higher hornblende and slightly higher potassium feldspar content and by slightly lower plagioclase content. Minor metal variability data obtained from spectrochemical analyses of the ferromagnesian phases, of magnetite, and of sphene for Ba, Be, Cr, Cu, Mo, Ni, Sn, Y, Y and Zn provide estimates of local (within-grid) and regional components of variability in this stock. Empirical frequency distribution plots for Be, Cr, Cu, Ni, Y, Y and Zn in ferromagnesian phase separates appear to be satisfactorily approximated by a lognormal distribution as a model for describing the distribution of trace elements within a mineral phase. Factors which complicate the application of theoretical frequency distributions to trace elements in granitic rooks include paragenesis, fraotionation, compositional zonation and metasomatism. The distribution of magnetite content in bulk rock samples of the Rooky Hill stock is complex, and its paragenesis is the main factor which leads to complications in the frequency distributions of minor elements in the ferromagnesian phases. Plots of partition coefficients for V and Cr between the biotite separates and magnetite and sphene illustrate the effect of paragenesis. The effect of systematic or regional components of variation in promoting possible bias in estimating population parameters from a given sample scale and surface exposure is pointed out.
Alfors J. T.
Putman G. W.
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