Analysis of partial melting reactions of pelitic and basic metamorphic rocks of the Hidaka metamorphic belt.

日高变质带泥质岩和基性变质岩部分熔融反应分析

基本信息

批准号：
07640631
负责人：
SHIBA Masatoshi
金额：
$ 1.34万
依托单位：
Hirosaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

Following results have been obtained by the three-year research (1995,1996 and 1997) supported by this grant.1.The Hidaka metamorphic rocks were formed by progressive metamorphism under the conditions of the greenschist facies to the granulite facies. The pressure and temperature conditions are estimated to have been 450ﾟC,0.2 MPa to 900ﾟC,0.5 MPa by means of several kinds of geothermometor and geobarometor. The age of the metamorphism are estimated to have been 56-40 Ma (Eocene) on the basis of data of K-Ar dating.2.Leucosome of pelitic and basic metamorphic rocks of the Hidaka metamorphic belt is solidified parts of melt formed by partial melting of these rocks. On the other hand, melanosome is residue of partial melting.3.Partial melting reactions of pelitic rocks of the granulite facies (zoneD and zone E) are as follow :1.3 biotite + 4.6 K-feldspar + 78.3 plagioclase + H_2O = 100 melt + 3.2 sillimanite + 191 quartz (in zone D),13.4 biotite + 8.6 plagioclase + 15.6 quartz + 16.9 sillimanite = 100 melt + 13.7 K-feldspar + 10.8 cordierite (in zone E).4.Partial melting reactions of basic rocks (amphibolite migmatites) of the granulite facies (zone E) calculated by the isocon method are as follow :0.77 hornblende + 10.00 plagioclase + 0.01 limenite = 0.04 magnetite + 10.98 + melt (in the lower temperature part of zone E),1.85 hornblende + 10.00 plagioclase + 0.0.ilmenite + 12.54 quartz = 0.01 magnetite + 23.96 melt + clinopyroxene (in the higher temperature part of zone E).5.Protolith of basic metamorphic rocks is basalt of N-MORB compositions.

这项拨款支持的三年研究（1995年，1996年和1997年）获得了以下结果。1。在绿岩设施的绿地设施条件下，渐进的变质岩石变质岩石是由渐进的变质岩形成的。压力和温度条件估计为450°C，0.2 MPa至900 c，0.5 MPa，通过几种地热计和地理位量计为0.5 MPa。根据K-AR约会的数据，估计变质的年龄为56-40 mA（始新世）。2。hideka metamorphic腰带的毛状和基本变质岩石的葡萄糖体是由这些岩石的部分融化而形成的。颗粒面（区域和E区）如下：1.3 Biotite + 4.6 k-feldspar + 78.3斜长石 + H_2O = 100熔体= 100熔体 + 3.2 Silkimanite + 191 Quartz（in doild d），1区D），13.4 Biotite + 8.6 plagioclase + 8.6 plagioclase + 15.6 Quartz + 13.9.9.9.9.9.9.9.9.9.9.9.9.9 k-felds + 100 n.8 k-felds + 100 n.8 k-feld +7摩托车ISOCON方法计算的颗粒面（E区E）基本岩石面（闪石米格马特岩）的晶状体融化反应（在E区域）中。0.77hornblende + 10.00斜长石 + 10.01 limenite = 0.01 limenite = 0.04磁场 + 10.98 + 10.98 + 10.98 + 10.98 + 10.98 + 10.98 + 10.98 + 10.98 + 10.98 + 10.85 + 10.85 + 10.85 + 10.85斜长石 + 0.0.ilmenite + 12.54 Quartz = 0.01磁铁矿 + 23.96熔体 + Clinopyroxene（在E区的较高温度部分中）。5。碱性变质岩石的质体是N-Morb成分的玄武岩。