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タイトルヨミ
ビワコ ホクトウブ コウキ ハクアキ カイズキヤマ カコウガンタイ
日本語以外のタイトル
Late Cretaceous Kaizukiyama granite,northeast of LakeBiwa,Southwest Japan
ファイル
言語
日本語
著者
杉井 完治
澤田 順弘
内容記述(抄録等)
The Kaizukiyama granite is distributed northeast of Lake Biwa and was intruded into the Jurassic accretionary complex of the Mino-Tamba Belt.The grantic mass crops out over an area of approximately 120k㎡,(14 km N-S,11.5 km E-W).lt consists mainly of equigranular coarse-grained hornblende bearing biotite granite to granodiorite,associated with porphyritic hornblende bearing biotite granite-granodiorite,medium-grained muscovite granite,and granite porphyry.
Equigranular hornblende bearing biotite granite-granodiorite of the Kaizukiyama granite consists mainly Plagioclase,K-feldspar and quartz,with subordinate biotite and hornblende,and accessory opaque minerals,apatite,zircon,monazite,allanite and tourmaline.Porphyritic hornblende bearing biotite granite-granodiotite have the same mineralogy,but contain K-feldspar megacrysts up to 7 cm in length.Medium-grained muscovite granite occurs in the central part of the Kaizukiyama granite as schlieren less than a few tens of meters in width,and consists mainly of plagioclase,K-feldspar,quartz and muscovite,with accessory biotite,garnet,opaque minerals,apatite,zircon and monazite.
Color index(modal composition of mafic minerals)and modal plagioclase / K-feldspar ratio of slab samples and magnetic susceptibility tend to decrease from the margin to core,and with increasing of altitude(from 250 m to 1200 m).
SiO_2 contents of hornblende bearing biotite granite−granodiorite and muscovitegranite from the Kaizukiyama granite are 66.52-72.23 wt% and 75.25-75.87 wt%,respectively.Muscovite granite plots with in the S-type granite field on the ACF diagram of White and Chappell(1977).
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
69
終了ページ
84
ISSN
13439774
発行日
1999-12-25
NCID
AA11455176
DOI(SelfDOI)
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
ファイル形式
PDF
著者版/出版社版
出版社版
部局
(旧組織)大学院総合理工学研究科
備考
12-14,16+ / 1993+
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