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

• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640631/
• 关键词: Hidaka metamorphic rocks; granulite facies; amphibolite migmatite; N-MORB; leucosome; melanosome; mesosome; isocon method; アイソコン法; 変成条件; ブラニュライト相; 温度-圧力-時間経路; 泥質変成岩; 塩基性変成岩; アナテクシス; 部部融解反応; 部分融解反応

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.

通过1995、1996、1997三年的研究，取得了以下成果：1.日高变质岩是在绿片岩相-麻粒岩相条件下，经递进变质作用形成的。利用多种地质温度计和地质压力计估算了其压力和温度条件为450 ℃、0.2 ~ 900 ℃、0.5MPa。2.日高变质带的泥质和基性变质岩中的白质体是部分熔融形成的熔融体的凝固部分。另一方面，黑素体是部分熔融的残留物。3.麻粒岩相泥质岩的部分熔融反应（D带和E带）：1.3黑云母+4.6钾长石+78.3斜长石+ H_2O = 100熔体+3.2硅线石+191石英（D区），13.4黑云母+8.6斜长石+15.6石英+16.9硅线石= 100熔体+13.7钾长石+10.8堇青石（E区）.4.基性岩的部分熔融反应用等离子体法计算的麻粒岩相（E带）的角闪岩混合岩（斜长角闪岩）如下：0.77角闪石+10.00斜长石+0.01褐铁矿= 0.04磁铁矿+10.98+熔体（在区域E的较低温度部分），1.85角闪岩+10.00斜长石+0.00钛铁矿+12.54石英= 0.01磁铁矿+23.96熔体+单斜辉石5.基性变质岩的原岩为N-MORB成分的玄武岩。

项目成果

Masatoshi Shiba, Yoshito Tanaka and Tsuyoshi Araki: "Shear movement of the Hidaka main thrust in the southern part of the Hidaka metamorphic belt." Science Reportof the Hirosaki University. vo1.44, no.1. 81-86 (1997)

Masatoshi Shiba、Yoshito Tanaka 和 Tsuyoshi Araki：“日高变质带南部日高主冲断层的剪切运动”。

Keisuke Saheki, Masatoshi Shiba, Tetsumaru Itaya and Hitoshi Onuki: "K-Ar dating of metamorphic and plutonic rocks in the southern part of the Hidaka metamorphic belt and its significant." Journal of Petrology, Mineralogy, and Economic Geology. vo1.90, no

Keisuke Saheki、Masatoshi Shiba、Tetsumaru Itaya 和 Hitoshi Onuki：“日高变质带南部变质岩和深成岩的 K-Ar 测年及其意义。”

Masatoshi Shiba and Takaaki Kanno: "Metamorphic zoning of the Nakanogawa group in the southeastern part of the Hidaka metamorphic belt." Science Report of the Hirosaki University. vol.42, no.1. 107-114 (1995)

Masatoshi Shiba 和 Takaaki Kanno：“日高变质带东南部中野川群的变质带。”

Tsuyoshi Araki and Masatoshi Shiba: "Deformational movement of the Saruru-Toyoni shear zone of the southern part of the Hidaka metamorphic belt." Science Report of the Hirosaki University. vo1.43, no.1. 131-138 (1996)

Tsuyoshi Araki 和 Masatoshi Shiba：“日高变质带南部萨鲁鲁-丰尼剪切带的变形运动”。

荒木 強・柴 正敏: "日高変成帯南部,猿留-豊似剪断帯における変形運動" 弘前大学理科報告. 43. 131-138 (1996)

Tsuyoshi Araki 和 Masatoshi Shiba：“日高变质带南部猿留-丰尼剪切带的变形运动”弘前大学科学报告 43. 131-138 (1996)。