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language
eng
Author
Kashiwabara, Y.
Description
A jadeitite block probably derived from serpentines of the Osayama ultramafic body in the Renge metamorphic belt is described petrographically.The jadeitite(Osa-1)consists mostly of jadeite,with subordinate omphacite,diopside,wollastonite,pectolite,prehnite,grossular,calcite,vesuvianite,Naamphibole,Na-Caamphibole,phlogopite,serpentine,chlorite and chromite.The clinopyroxenes in Osa-1 are classified into jadeite,omphacite and diopside.The chemical compositions of clinopyroxenes depend on the mode of their occurrence.Clinopyroxenes forming columnar crystals in the massive jadeitite portions consist of jadeite(Jd_<84-100>),and columnar or acicular crystals in fracture zones are omphacite(Jd_<32-45>).Clinopyroxenes occurring in veins are classified into jadeite-omphacite(Jd_<74-83>),omphacite(Jd_<41-54>)and diopside(Jd_<0-9>).Clinopyroxenes occurring as aggregates of acicular crystals are diopside(Jd_<0-2>).
Ca-rich minerals such as diopside,prehnite,vesuvianite,calcite,wollastonite,pectolite and grossular occur within veins or along cracks in a matrix consisting mostly of jadeite.This suggests that infiltration of Ca-rich fruid occurred at the later stage of a formation of the jadeitites within these serpentinite body.
Journal Title
島根大学地球資源環境学研究報告
Volume
20
Start Page
133
End Page
142
ISSN
13439774
Published Date
2001-12-28
NCID
AA11455176
DOI(SelfDOI)
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
Format
PDF
Text Version
出版社版
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
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