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Title Transcription
サンインタイ シマネケン チュウオウブ ニ サンスル タカハタ カコウガン オヨビ オクヤマ トーナルガン ノ ガンセキガクテキ ネンダイガクテキ ケンキュウ
Title Alternative (English)
Petrological and geochronological studies on the Takahata granite and Okuyama tonalite in central Shimane prefecture,San'in Belt,SW Japan
File
language
jpn
Author
Iizumi, Shigeru
Shimazu, Naoya
Description
Petrological and geochronological data are presented for the Takahata granite and Okuyama tonalite in the central San'in belt,southwest Japan.The Takahata granite consists of coarse to medium grained,equigranular to weakly porphyritic biotite granite,granite porhyry,and aplite.The Takahata granite is intruded by the Okuyama tonalite with sharp contact.The Okuyama tonalite ranges in rock type from medium-grained,biotite-hornblende quartz diorite through tonalite to granodiorite.The Takahata granite is silicic and has high ASI(alumina saturation index)for I-type magnetite series granites,and is characterized by relatively high total Fe_2O_3 content,compared with other fractionated granitic rocks in the central San'in belt.The Okuyama tonalite is metaluminous,and has high magnetic susceptibility.In contrast to the previously reported fission track zircon ages(80 Ma and 82±7 Ma),the Takahata granite gives a Rb-Sr whole rock isochron age of 67.4±4.2 Ma with an initial Sr isotope ratio of 0.7052±0.0004.The Okuyama tonalite yields an age of 65.4±11.3 Ma with an initial Sr isotope ratio of 0.7050±0.0001.Although the Takahata granite has previously been considered to be older than most granitoids in the San'in belt,petrological,geochronological and Sr and Nd isotopic data indicate that the Takahata granite and the Okuyama tonalite belong to the late Cretaceous-Paleocene Inbi Intrusives of the San'in belt.
Journal Title
島根大学地球資源環境学研究報告
Volume
23
Start Page
1
End Page
7
ISSN
13439774
Published Date
2004-12-27
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
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