ダウンロード数 : ?
タイトルヨミ
Chemical zoning of garnets from the low-grade metamorphic rocksof the Silgara Formation, Santander Massif, Eastern CordilleraColombian Andes
タイトル別表記
Chemical zoning of garnets from the low-grade metamorphic rocksof the Silgara Formation, Santander Massif, Eastern Cordillera(Colombian Andes)
ファイル
言語
日本語
著者
リオス カルロス
内容記述(抄録等)
The Lower Paleozoic Silgara Formation is exposed in the Pescadero-Aratoca area,southwestern Santander Massif,and consists of metapelites and interlayered metabasic rocks intruded by Triassic-Jurassic calc-alkaline granites.A sequence of metamorphic zones was developed during Caledonian low-P/T metamorphism.The regional metamorphic grade of the Silgara Formation decreases southwestward,from the sillimanite zone,through the staurolite and garnet zones,to the biotite-zone.Metamolphism has occunrred under conditions of high-temperature and low-pressure(Buchan type metamorphism),and reflects the high heat flow that exists in this part of the Santander Massif.
Garnet in the pelitic schists preserves chemical zoning,with decreasing X_<Mn>,and increasing X_<Fe> and X_<Mg> from core to rim,suggesting craystal growth during increasing temperature.X_<Ca> increases outwards and reaches a maximum at mantle,and is dependant on metamolphic pressure(maximum X_<Ca> indicates peak metamorphic pressure).
掲載誌名
島根大学地球資源環境学研究報告
18
開始ページ
97
終了ページ
107
ISSN
13439774
発行日
1999-12-25
NCID
AA11455176
出版者
島根大学総合理工学部地球資源環境学教室
出版者別表記
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
資料タイプ
紀要論文
部局
(旧組織)大学院総合理工学研究科
備考
12-14,16+ / 1993+
このエントリーをはてなブックマークに追加