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  1. H150 博物館
  2. H150b 紀要
  3. 名古屋大学博物館報告
  4. 36

The magmatic relationship between the "Kurotani ultra-mafic rock" and the Ordovician(?) Iwatsubodani Formation, Takayama City, Hida Gaien belt, central Japan : the chemical composition of clinopyroxene

https://doi.org/10.18999/bulnum.036.04
https://doi.org/10.18999/bulnum.036.04
e065e1c7-2848-4683-9a78-852b08c43729
名前 / ファイル ライセンス アクション
036_04.pdf 036_04.pdf (6.7 MB)
Item type itemtype_ver1(1)
公開日 2021-06-24
タイトル
タイトル The magmatic relationship between the "Kurotani ultra-mafic rock" and the Ordovician(?) Iwatsubodani Formation, Takayama City, Hida Gaien belt, central Japan : the chemical composition of clinopyroxene
言語 en
著者 TSUKADA, Kazuhiro

× TSUKADA, Kazuhiro

en TSUKADA, Kazuhiro

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SHIMURA, Yusuke

× SHIMURA, Yusuke

en SHIMURA, Yusuke

Search repository
NADMID, Bayart

× NADMID, Bayart

NADMID, Bayart

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
キーワード
言語 en
主題Scheme Other
主題 ultra-mafic rock
キーワード
言語 en
主題Scheme Other
主題 Iwatsubodani Formation
キーワード
言語 en
主題Scheme Other
主題 clinopyroxene chemical composition
キーワード
言語 en
主題Scheme Other
主題 Hida Gaien belt
キーワード
言語 en
主題Scheme Other
主題 central Japan
内容記述
内容記述 A major problem for understanding the tectonic history of the Inner zone of Southwest Japan is the spatial tectonic contrast between the rocks in its western and eastern parts. In the western part of the zone, the Sangun–Renge, Akiyoshi, Maizuru, and Ultra-Tanba belts are widely exposed, whereas they are fragmented in a narrow area along the Hida Gaien belt in the eastern part. The Hida Gaien belt with its fault-bound blocks is thus a key unit for understanding the geology. The lithostratigraphy and structure of the blocks composed of volcanic/sedimentary rocks have been studied previously (e.g., Tsukada et al., 2004), but few attempts have been made to study the blocks of ultra-mafic rock which are critical to understanding the tectonic process in the Hida Gaien belt. In the Nakao area, Takayama City, Ordovician(?) mafic volcanic rocks (the Iwatsubodani Formation) of the Hida Gaien belt have been thrust onto an unclassified block of Kurotani ultramafic rock (KUM). This paper describes the mineral chemical composition of rocks from the KUM and the Iwatsubodani Formation and discusses the magmatic relationship between their clinopyroxene (Cpx) chemical composition. The Mg# (= Mg/(Mg + Fe) mol%) of Cpx in the KUM is 0.93–0.98. In the Iwatsubodani Formation, sub-ophitic lava (Mg# of interstitial Cpx = 0.41–0.79) is overlain by pyroclastic rock with abundant clasts of porphyritic lava (Mg# of Cpx porphyry = 0.75–0.90). In the variation diagram, most elements of Cpx from the KUM and Iwatsubodani Formation form a linear trend against Mg#. Thus, the KUM and Iwatsubodani Formation probably both originated through fractionation from a single magma source. Although the porphyritic lava overlies sub-ophitic lava in the Formation, the Mg# of Cpx in the porphyritic lava is much higher than that of the underlying sub-ophitic lava. This fact suggests that the Cpx porphyry of the porphyritic lava had probably crystalized in a magma chamber before the sub-ophitic lava stage.
言語 en
内容記述タイプ Abstract
出版者
言語 ja
出版者 名古屋大学博物館
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
ID登録
ID登録 10.18999/bulnum.036.04
ID登録タイプ JaLC
収録物識別子
収録物識別子タイプ PISSN
収録物識別子 1346-8286
書誌情報 ja : 名古屋大学博物館報告
en : Bulletin of the Nagoya University Museum

巻 36, p. 53-68, 発行日 2021-03-01
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