Maturing processes of deeper part of the Island arc: Diversity of crust-mantle boundary and their origins in the Albania Ophiolite

2012 Fiscal Year Final Research Report

• Project/Area Number: 21403010
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Kanazawa University
• Principal Investigator: MORISHITA Tomoaki 金沢大学, 自然システム学系, 教授 (80334746)
• Co-Investigator(Kenkyū-buntansha): OZAWA Kazuhito 東京大学, 理学研究科, 教授 (90160853) ; SUZUKI Katsuhiko 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, グループリーダー (70251329) ; YOSHIKAWA Masako 京都大学, 理学研究科, 教務補佐員 (00378605)
• Project Period (FY): 2009 – 2012
• Keywords: 島弧深部 / マントル / 下部地殻 / オフィオライト / マグマ活動

Research Abstract

In order to understand the maturing processes in the deeper part of the Island arc systems, we examined arc-related ophiolites and related rocks from all over the world, particularly in the Mirdita ophiolite, Albania. Based on our filed works coupled with geochemical analyses, we concluded the maturing processes in the deeper part of the Island arc system as follows:
(1) Effect of influx melting due to infiltration of hydrous fluids/melts are increased toward the upper section of the peridotite section, i.e., the upper most mantle section
(2) Silica-enrichment is caused by interaction with slab-derived hydrous fluids
(3) Peridotite massifs in the Western Mirdita Ophiolite, which had been interpreted to be of mid-ocean ridge origin, were originally formed at mid-ocean ridge setting, but was also affected by arc-related hydrous fluids/melts, resulting in the formation of fertile peridotite, such as amphibole-rich peridotites.

Research Products

• [Journal Article] Igneous sapphirine as a product of melt-peridotite interactions in the Finero Phlogopite-Peridotite Massif (2013)
  • Author(s): Giovanardi, T., Morishita, T., Zanetti, A., Mazzucchelli, M.,Vannucci, R.
  • Journal Title: Western Italian Alps.European Journal of Mineralogy Volume: 25 Pages: 17-31
  • Peer Reviewed
• [Journal Article] Petit-spot lava fields off the central Chile trench induced by plate flexure. (2013)
  • Author(s): Hirano, N., Machida, S., Abe, N., Morishita, T., Tamura, A., Arai, S.
  • Journal Title: Geochemical Journal Volume: 47 Pages: 247-257
  • Peer Reviewed
• [Journal Article] Significance of chromian spinels from the mantle sequence of the Andaman Ophiolite, India: Paleogeodynamic implications. (2013)
  • Author(s): Ghosh, B., Morishita, T., Bhatta, K.
  • Journal Title: Lithos Volume: 164-167 Pages: 86-96
  • Peer Reviewed
• [Journal Article] Detrital chromian spinels from beach placers of Andaman Islands, India: A perspective view of petrological characteristics and variations of the Andaman ophiolite. (2012)
  • Author(s): Ghosh, B., Morishita, T., Bhatta, K.
  • Journal Title: Island Arc Volume: 21 Pages: 188-201
  • Peer Reviewed
• [Journal Article] On the Recycling of Amphibole-rich Ultramafic Intrusive Rocks in the Arc Crust: Evidence from Shikanoshima Island (Kyushu, Japan) (2012)
  • Author(s): Tiepolo, M., Langone, A., Morishita, T., Yuhara, M.
  • Journal Title: Journal of Petrology Volume: 53 Pages: 1255-1285
  • Peer Reviewed
• [Journal Article] Insight into the uppermost mantle section of a maturing arc: The Eastern Mirdita ophiolite, Albania. (2011)
  • Author(s): Morishita, T., Dilek, Y., Shallo, M., Tamura, A., Arai, S.
  • Journal Title: Lithos Volume: 124 Pages: 215-225
  • Peer Reviewed
• [Journal Article] Diversity of melt conduits in the Izu-Bonin-Mariana forearc mantle: Implications for the earliest stage of arc magmatism. (2011)
  • Author(s): Morishita, T., Tani, K., Shukuno, H., Harigane, Y., Tamura, A., Kumagai, H., Hellebrand, E.
  • Journal Title: Geology Volume: 39 Pages: 411-414
  • Peer Reviewed
• [Journal Article] Osmium behavior in a subduction system elucidated from chromian-spinel sands from Bonin Island beaches (2011)
  • Author(s): Suzuki, K., Senda, R., Shimizu, K.
  • Journal Title: Geology Volume: 39 Pages: 999-1002
  • Peer Reviewed
• [Journal Article] Deciphering the trace element characteristics in Kilbourne Hole peridotite xenoliths: melt-rock interaction and metasomatism beneath the Rio Grande Rift, SW USA
  • Author(s): Harvey, J., Yoshikawa, M., Hammond, S.J. and Burton, K.W.
  • Journal Title: Journal of Petrology Volume: 53 Pages: 1709-1742
  • Peer Reviewed
• [Presentation] Partial melting, modal metasomatism and serpentinization due to multiple infiltrations of geofluids in the Finero Mafic-Ultramafic Complex, Italy. (2012)
  • Author(s): Morishita, T., Zanetti, M.,Mazzucchelli, Yoshikawa, M., Suzuki, A., Tamura, A.
  • Organizer: Joint Symposium of Misasa-2012 and Geofluid-2Dynamics and Evolution of the Earth's Interior: special emphasis on the role of fluids
  • Place of Presentation: Misasa, Tottori, Japan
  • Year and Date: 20120300
• [Presentation] Melt Composition variations in subduction initiation magmatism: constrains from the peridotites of theIzu-Bonin-Mariana forearc and the Eastern Mirdita Ophiolite, Albania. (2011)
  • Author(s): Morishita, T., Tani, K., Dilek, Y.
  • Organizer: European Geological Union
  • Place of Presentation: Vienna, Australia
  • Year and Date: 20110000
• [Presentation] Petrological and geochemical evolution of the MOHO in oceanic lithosphere ofsuprasubduction zone origin: Eastern Mirdita ophiolite, Albania. (2010)
  • Author(s): Morishita, T., Dilek, Y.
  • Organizer: Geological Society of America, Special meeting
  • Place of Presentation: Ankara, Turkey
  • Year and Date: 20100000
• [Remarks]
  • URL: http://earth.s.kanazawa-u.ac.jp/tomo/Morishita-Lab/zui_chu.html