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Title Transcription
サンイン タイ ノ ホウブツサン カコウガン ニオケル ストロンチウム ドウイタイ ヒ ショセイチ ト セイナン ニホンナイ タイ ノ ハクアキ コダイサンキ カセイガン ルイ ノ ストロンチウム ドウイタイ ノ チリテキ ブンプ
Title Alternative
Initial Sr Isotope Ratio of the Hobutsu-san Granite, San'in Belt, SW Japan : Implications for Sr Isotope Variation of Cretaceous-Paleogene Igneous Rocks in the Inner Zone of SW Japan
File
language
eng
Author
Iizumi, Shigeru
Kagami, Hiroo
Description
The Hobutsu-san granite stock, the southwestem part of Tottori prefecture, SW Honshu, has a Rb-Sr whole rock isochron age of 72.3±2.8Ma with an initial ratio of 0.70681. The initial ratio is remarkably high for granitoids of the San'in Belt. High Sr isotope ratios of some lower crustal granulite xenoliths included in an alkali basalt of the Oki islands, suggest that the lower crust could have been a magma source for the Hobutsu-san granite. Initial Sr isotopic ratios of Cretaceous-Paleogene igneous rocks in the Inner Zone of Southwest Japan decrease from south to north through a transitional zone. This supports a previous suggestion by KAGAMI et al. (1987) that the magmas for the granites of SW Honshu and North Shikoku have been derived from three source regions with different geochemistry.
Journal Title
Memoirs of the Faculty of Science, Shimane University
Volume
21
Start Page
145
End Page
152
ISSN
03879925
Published Date
1987-12-25
NCID
AN00108106
Publisher
島根大学理学部
Publisher Aalternative
The Faculty of Science, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Faculty of Science and Engineering