中央海嶺産海洋プレート深部起源岩石掘削の成果と展望  [in Japanese] Drilling into deep-seated hard rocks of the oceanic plate formed at the Mid-Ocean Ridge: results and future perspectives: Deep-seated Hard Rock Drilling  [in Japanese]

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Author(s)

    • 森下 知晃 Morishita Tomoaki
    • 金沢大学理工研究域自然システム学系 Faculty of Natural System, Institute of Science and Engineering, Kanazawa University

Abstract

<p>本論では,2003年-2013年の10年間のIntegrated Ocean Drilling Program(IODP)で行われた掘削のうち,中央海嶺で形成された海洋プレートの深部起源である斑れい岩やかんらん岩が採取された航海について,記載岩石学的,地球化学的内容を中心にまとめた.主要な貢献は(1)海洋コアコンプレックスの成因に関する1400mを超える斑れい岩が採取された大西洋アトランティス・マッシーフにおける掘削孔U1309(304/305航海),(2)高速拡大系ココスプレートで世界初の海洋斑れい岩採取された掘削孔1256D(206, 309, 312, 335航海),(3)高速拡大系の東太平洋海膨ヘス・ディープからの層状斑れい岩が採取された掘削孔U1415(345航海)である.また掘削調査船「ちきゅう」を用いた将来的なマントル掘削を含む海洋深部岩石掘削計画について紹介した.</p>

<p>Petrological and geochemical results from Integrated Ocean Drilling Program (IODP, 2003-2013) analyses of deep-seated mid-ocean ridge rocks (gabbros and peridotites) are summarized. Three important contributions to our understanding of the nature and origin of oceanic core complexes were obtained from: (1) a >1400 m gabbroic section from the Atlantis Massif of the Mid-Atlantic Ridge (site U1309, drilled by Expeditions 304/305), (2) sampling of intact oceanic gabbro after drilling through basaltic and sheeted dike complex layers from the fast-spreading Cocos Plate (leg 206 of site 1256D, drilled by Expeditions 309, 312 and, 335), and (3) sampling of layered gabbro from the Hess Deep of the East Pacific Rise (site U1415, drilled by Expedition 345). Future deep-seated hard-rock drilling projects by the research drilling vessel CHIKYU, including mantle drilling projects, are introduced.</p>

Journal

  • The Journal of the Geological Society of Japan

    The Journal of the Geological Society of Japan 123(4), 185-205, 2017

    The Geological Society of Japan

Codes

  • NII Article ID (NAID)
    130005858673
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • ISSN
    0016-7630
  • NDL Article ID
    028202563
  • NDL Call No.
    Z15-174
  • Data Source
    NDL  J-STAGE 
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