Cumulus gabbro-diorite dikes associated with the Hioki granite stock, Kagoshima Prefecture, Japan

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Authors:Yamamoto, Masahiko; Yamamoto, Sentaro
Author Affiliations:Primary:
Kagoshima University, Faculty of Science, Department of Earth and Environmental Sciences, Kagoshima, Japan
Kyocera Company, Japan
Volume Title:Ganko Journal of Mineralogy, Petrology and Economic Geology
Source:Ganko = Journal of Mineralogy, Petrology and Economic Geology, 94(2), p.37-45. Publisher: Mineralogical Society of Japan and the Japanese Association of Mineralogists, Petrologists and Economic Geologists, Sendai, Japan. ISSN: 0914-9783
Publication Date:1999
Note:In English with Japanese summary. 14 refs.; illus., incl. 2 tables, geol. sketch map
Summary:The Hioki mafic dikes composed of gabbroic and dioritic rocks are associated with the Hioki granite stock of middle Miocene age in the central part of Satsuma Peninsula, Kagoshima Prefecture, Japan. The gabbroic dike consists of orthocumulus olivine-bearing pyroxene gabbro, and is chemically rich in not only compatible elements such as MgO, Ni and Cr but also incompatible elements such as K2O, Rb and Sr. The dioritic dike consists of orthocumulus biotite-bearing pyroxene diorite with intercumulus salic minerals and adcumulus plagioclase, and has chemically intermediate composition between the gabbro and the granite. Modes of occurrence, petrographical features and bulk and mineral compositions suggest that the Hioki mafic dikes were formed from cumulus phases, and the granitic intrusives could have been derived from residual liquids, through crystal fractionation of calc-alkaline andesitic magma.
Subsections:Igneous petrology
Subjects:Cenozoic; Chemical composition; Crystal fractionation; Dikes; Diorites; Gabbros; Granites; Igneous rocks; Intrusions; Middle Miocene; Mineral composition; Miocene; Neogene; Petrography; Plutonic rocks; Stocks; Tertiary; Asia; Far East; Japan; Kagoshima Japan; Kyushu; Satsuma Peninsula; Hioki Granite
Coordinates:N313000 N315000 E1303500 E1301000
Abstract Numbers:01M/823
Record ID:2001023552
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute.
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