Physics
Scientific paper
Feb 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..18..232h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 18, Issue 3-4, pp.232-246
Physics
Scientific paper
Geochemical and crystallochemical relationships in the lavas and pyroclastics of Sakura-jima volcano, Japan, suggest that magmatic differentiation is the dominant fractionation process. A triangular diagram is shown for Na-K-Ca and total Fe--Mg--Na + K. The volcanics investigated are the Kitadake, Minamidake, unknown eruption epoch, 1468-1476, 1779, 1914, 1946 flows, and 1955-1958 pyroclastics. Trends are illustrated in Cr, Mg, Ca, V, Fe, Si, Al, Ga and O in modified Larsen diagrams. Various ionic ratios, especially V/Fe, show marked variation on the modified Larsen plot. From the 1468-1476 until the 1914 eruptions, the Sakura-jima lavas tend to become more mafic. From 1946 until 1958, there is a tendency to become more silicic. However, within the 1955-1958 volcanic sequence, Co, Cr and V increases suggest increasing mafic differentiation of the lavas and pyroclastics. Distinct and extreme anomalies occur in Co, Cr and V in the initial pulse of a given eruption within the 1955-1958 sequence. During the initial high energy eruptive phase, expulsion of mafic differentiates (enriched in Co, Cr, and V) consolidated in the volcanic throat is thought to account for these high concentrations. Pb is also enriched in the early eruptive phases in the 1955-1958 volcanic series. Volcanic sublimates accumulating during the inter-eruptive period in the pyroclastic material within the volcano may account for this phenomenon. Spectroscopic analyses for Ga, Ni, Co, Cr, V, Pb, and Sn are given for sixty-two samples.
Hamaguchi Hiroshi
Ishikawa Hideo
Kuroda Rokuro
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