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Picrites in central Hokkaido: Evidence of extremely high temperature magmatism in the Late Jurassic ocean recorded in an accreted oceanic plateau

2012; Geological Society of America; Volume: 40; Issue: 5 Linguagem: Inglês

10.1130/g32752.1

1943-2682

Yuji Ichiyama, Akira Ishiwatari, Jun‐Ichi Kimura, Ryoko Senda, Hiroshi Kawabata, Yoshiyuki Tatsumi,

Geochemistry and Geologic Mapping

Research Article| May 01, 2012 Picrites in central Hokkaido: Evidence of extremely high temperature magmatism in the Late Jurassic ocean recorded in an accreted oceanic plateau Yuji Ichiyama; Yuji Ichiyama * 1Data Research Center for Marine-Earth Sciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan *E-mail: ichiyamay@jamstec.go.jp. Search for other works by this author on: GSW Google Scholar Akira Ishiwatari; Akira Ishiwatari 2Center for Northeast Asian Studies (CNEAS), Tohoku University, 41 Kawauchi, Aoba-ku, Sendai 980-8576, Japan Search for other works by this author on: GSW Google Scholar Jun-Ichi Kimura; Jun-Ichi Kimura 3Institute for Research on Earth Evolution, JAMSTEC, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan Search for other works by this author on: GSW Google Scholar Ryoko Senda; Ryoko Senda 3Institute for Research on Earth Evolution, JAMSTEC, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan Search for other works by this author on: GSW Google Scholar Hiroshi Kawabata; Hiroshi Kawabata 3Institute for Research on Earth Evolution, JAMSTEC, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan Search for other works by this author on: GSW Google Scholar Yoshiyuki Tatsumi Yoshiyuki Tatsumi 3Institute for Research on Earth Evolution, JAMSTEC, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Yuji Ichiyama * 1Data Research Center for Marine-Earth Sciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan Akira Ishiwatari 2Center for Northeast Asian Studies (CNEAS), Tohoku University, 41 Kawauchi, Aoba-ku, Sendai 980-8576, Japan Jun-Ichi Kimura 3Institute for Research on Earth Evolution, JAMSTEC, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan Ryoko Senda 3Institute for Research on Earth Evolution, JAMSTEC, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan Hiroshi Kawabata 3Institute for Research on Earth Evolution, JAMSTEC, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan Yoshiyuki Tatsumi 3Institute for Research on Earth Evolution, JAMSTEC, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan *E-mail: ichiyamay@jamstec.go.jp. Publisher: Geological Society of America Received: 16 Aug 2011 Revision Received: 15 Nov 2011 Accepted: 06 Dec 2011 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2012 Geological Society of America Geology (2012) 40 (5): 411–414. https://doi.org/10.1130/G32752.1 Article history Received: 16 Aug 2011 Revision Received: 15 Nov 2011 Accepted: 06 Dec 2011 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Yuji Ichiyama, Akira Ishiwatari, Jun-Ichi Kimura, Ryoko Senda, Hiroshi Kawabata, Yoshiyuki Tatsumi; Picrites in central Hokkaido: Evidence of extremely high temperature magmatism in the Late Jurassic ocean recorded in an accreted oceanic plateau. Geology 2012;; 40 (5): 411–414. doi: https://doi.org/10.1130/G32752.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Sorachi-Yezo belt, central Hokkaido, Japan, is composed of voluminous tholeiitic basaltic volcanics, and has been thought to be accreted fragments of an oceanic plateau formed in the Late Jurassic Pacific Ocean. Picrites have been reported as pillow lava and hyaloclastite from the Sorachi-Yezo belt. These picrites are characterized by very magnesian olivine phenocrysts (up to Fo [=100* Mg/(Mg+Fe)] = 94.1), which indicate that the primary magma was unusually Mg rich. The estimated MgO of the primary magma and the mantle potential temperature are as high as 29 wt% and 1700 °C, respectively, comparable to those of the Neoarchean komatiites, and higher than those of the Gorgona komatiites and picrites. The rare earth element patterns of the Sorachi-Yezo picrites are divided into two groups that are chemically akin to the Neoarchean komatiites and Gorgona komatiites and picrites, indicating different melting regimes in an extremely hot mantle plume. The Sorachi-Yezo picrites provide evidence for extremely high temperature magmatism, like that of Archean komatiite, caused by melting of the hottest mantle plume among the Phanerozoic oceanic large igneous provinces. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.