A PETROLOGICAL STUDY ON YOUNGER GRANITIC ROCKS AND REALATED METAMORPHIC ROCKS IN THE ABUKUMA MOUNTAINS.

对阿布库玛山较年轻的花岗岩和相关变质岩的岩石学研究。

• 批准号: 61540582
• 负责人: TANAKA Hisao
• 金额: $ 1.47万
• 依托单位: YAMAGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61540582/
• 关键词: Hanawa granitic pluton; High-grade metamorphic rocks; Geology; Modal analyses; Petrochemistry; 深成岩類の鉱物および化学組成; 鉱物の化学組成; 中部阿武隈山地; 深成岩類; 変成岩類; 岩石の分布; 岩石の鉱物成分; 造岩鉱物の化学組成

THE CRETACEOUS HANAWA GRANITIC PLUTON AND NEIGHBORING HIGH-GRADE METAMORPHIC ROCKS WERE STUDIED IN DETAIL, AND A GEOLOGIC MAP IS MADE. THE HANAWA PLUTON IS CONSTITUTED BY. IN ORDER OF INTRUSION FROM OLD TO YOUNG, FINE-GRAINED QUARTZ DIORITE AND TONALITE, FOLIATED TONALITE AND GRANODIORITE, AND MAIN GRANODIORTIC ROCKS. THE GRANODIORITIC ROCKS CAN BE DIVIDED INTO FOUR TYPES; THAT IS PORPHYRITIC POTASH FELDSPAR- AND QUARTZ-BEARING, LAGRE SPHENE-BEARING, MYLONITIC, AND FINE-GRAINED EQUIGRANULA TYPES. SEVENTY-ONE MODAL ANALYSES INDICATE・THAT IN GENERAL THE YOUNGER ROCKS ARE, THE RICHIER IN POTASHI FEDLSPAR AND QUARTZ AND THE POORER IN MAFIC MINERALS. CHEMICAL VARIATION OF 13 GRANODIORITIC ROCKS ARE FAIRLY LIMITED (SiO_2 67-73%), AND ARE SIMILAR TO THOSE OF AVERAGE JAPANESE GRANITIC ROCKS. GM/(MG+FE) RATIO OF BIOTITE AND AN CONTENT OF PLAGIOCLASE EXHIBIT AND OVERALL TREND OF DECREASE TOWARD A SOUTH WESTERN SIDE IN THE GRANODIORITIC PLUTON. MINERAL ASSEMBLAGE AND INDEX MINERAL INDICATE THAT A METAMORPHIC GRADE GENERALLY DECREASES TOWARD THE HANAWA PLUTON, FROM THE GRANULITE FACIES TO THE AMPHIBOLITE FACIES. THIS FACT MAY SUGGEST THAT THE INTRUSION OF THE HANAWA PLUTON WAS NOT IMPORTANT IN FORIMG THE HIGH-GRADE METAMORPHIC ROCKS. TWO TYPES OF METAMORPHISM ARE INFERRED, THAT IS A HIGH TEMPEARTURE AND MODERATE PRESSURE TYPE, AND A MODERATE TEMPERATURE AND LOW PRESSURE TYPE.

本文研究了白垩纪花泽花岗岩体及其邻近的高级变质岩，并编制了地质图。花轮岩体由。从老到新依次为细粒石英闪长岩、英云闪长岩、叶状英云闪长岩、花岗闪长岩和主要花岗闪长岩。花岗闪长岩可分为四种类型，即含钾长石和石英的斑状岩、含辉石岩的斑状岩、糜棱岩和细粒等长花岗岩。71个模态分析表明，一般来说，较年轻的岩石，在钾长石和石英中较丰富，在镁铁矿物中较贫乏。13个花岗闪长岩的化学变化有限（SiO_2为67-73%），与日本一般花岗岩相似。黑云母的GM/（MG+FE）比和斜长石含量显示出花岗闪长岩地块向西南侧下降的总体趋势。矿物组合和指标矿物表明，从麻粒岩相到角闪岩相，向花轮地块方向，变质程度通常会降低。这一事实可能表明，花轮岩体的侵入对高级变质岩的形成并不重要。变质作用可分为高温中压型和中温低压型两种。

项目成果

田中久雄,吉田武義,青木謙一郎: 東北大学核理研研究報告. 20. 85-98 (1987)

Hisao Tanaka、Takeyoshi Yoshida、Kenichiro Aoki：东北大学核研究报告。20. 85-98 (1987)。

HISAO TANAKA, TAKEYOSHI YOSHIDA, AND KEN-ICHIRO AOKI: "A GEOCHEMICAL STUDY ON THE TABITO PLUTON, ABUKUMA MOUNTAINS. ( IN JAPANESE)" RES. REP. LAB. NUC. SCI. TOHOKU UNIV.,. 20. 85-98 (1987)

HISAO TANAKA、TAKEYOSHI YOSHIDA 和 KEN-ICHIRO AOKI：“ABUKUMA 山脉 Tabito PLUTON 的地球化学研究。（日语）”RES。

HISAO TANAKA, CHUNG-SHI HUANG, YOUICHI NAKAMURA, ETSUO KUROKAWA AND MASAHIRO NOBUSAKA: "PETROLOGY OF AN EPIZONAL GABBROIC SUITE : THE BATOW PLUTON, YAMIZO MOUNTAINS, CENTRAL JAPAN." JOUR. JAPAN. ASSOC. MIN. PETR. ECON. GEOL.,. 82. 419-432 (1987)

HISAO TANAKA、CHUNG-SHI HUANG、YOUICHI NAKAMURA、ETSUO KUROKAWA 和 MASAHIRO NOBUSAKA：“外延辉长岩组的岩石学：日本中部 YAMIZO 山脉的 BATOW 岩体。”

Hisao Tanaka;Chung-Hsi Huang;Youichi Nakamura;Etsuo Kurokawa;Masahiro Nobusaka: Jour.Japan.Assoc.Min.Petr.Econ.Geol.82. 419-432 (1987)

Hisao Tanaka；Chung-Hsi Huang；Youichi Nakamura；Etsuo Kurokawa；Masahiro Nobusaka：Jour.Japan.Assoc.Min.Petr.Econ.Geol.82。

田中久雄: 東北大学核理研研究報告.

田中久雄：东北大学研究报告。