Shift and rotation of composition trends by magma mixing; 1983 eruption at Miyakejima Volcano, Japan

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doi: 10.1093/petrology/egg063
Authors:Kuritani, Takeshi; Yokoyama, Tetsuya; Kobayashi, Katsura; Nakamura, Eizo
Author Affiliations:Primary:
Okayama University, Institute for Study of the Earth's Interior, Tottori, Japan
Volume Title:Journal of Petrology
Source:Journal of Petrology, 44(10), p.1895-1916. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:2003
Note:In English. 48 refs.; illus., incl. charts, 4 tables, sketch map
Summary:These erupted magmas show linear rock composition trends that largely favour simple two component magma mixing but in detail require mixing of a homogeneous basaltic magma with andesitic magmas showing compositional diversity. The basaltic magma was discharged from one chamber at ∼ 2 kbar and injected and spread laterally and vertically (fountaining?) into a magma chamber that was at lower pressure (∼1 kbar) and filled with chemically zoned andesite magma. The compositional zoning in the titanomagnetite crystals reveals that the 1983 eruption was initiated shortly after the injection of the basaltic magma. Chemical analyses and Sr, Nd and Pb isotopes of basalts and andesitic basalts are given. [B.E.L.]
Subsections:Igneous petrology
Subjects:Basaltic composition; Composition; Eruptions; Magma chambers; Magmas; Mixing; Volcanoes; Whole rock; Asia; Far East; Honshu; Izu-shichito; Japan; Miyake-Jima
Coordinates:N340500 N341000 E1393200 E1392800
Abstract Numbers:04M/337
Record ID:2004017030
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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