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Title Transcription
ヒョウゴケン ホクブ ヤダガワ カコウガンタイ ノ Rb-Sr ゼンガン アイソクロン ネンダイ
Title Alternative (English)
Rb-Sr whole rock isochron age of the Yadagawa granite in northern Hyogo Prefecture,SW Japan
File
language
jpn
Author
Iizumi, Shigeru
Nakamura, Rina
Description
The Yadagawa granite in the northern part of Hyogo Prefecture is a stock composed mainly of medium- to coarse grained biotite granite,granite polphyry and aplitic granite.Fine-grained hornblende biotite quartz diorite and medium grained hornblende biotite granodiorite are minor rock types.The stock intrudes the late Cretaceous Yadagawa Group,which consist of andesite to rhyolite lavas and pyroclastics.Seven granites and a granite porphyry give a well-defined Rb-Sr whole rock isochron of 69.3 ± 3.6 Ma with an initial Sr isotope ratio of 0.70603 ± 0.00016.This indicates that the Yadagawa granite can be assigned to the latest Cretaceous to Paleocene Inbi Intrusives,which are widely distributed in the San'in district.The Yadagawa granite has a slightly higher initial Sr isotope ratio than most of the Inbi Intrusives.This is consistent with the concept that sources ofCretaceous felsic magmas in the eastern San'in and northern Kinki districts had higher ^<87>Sr/^<86>Sr ratios than those in the central and western San'in districts.
Journal Title
島根大学地球資源環境学研究報告
Volume
20
Start Page
125
End Page
131
ISSN
13439774
Published Date
2001-12-28
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+
中山勝博助教授追悼特集
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