Abstract
Three types of amphibolites were found around a large serpentinite body in the basement of the Ohmachi Seamount in the Izu-Bonin-Mariana arc: epidote-albite amphibolite, epidote-garnet amphibolite, and garnet-zoisite amphibolite. The epidote-albite amphibolite shows a mid-ocean ridge basalt geochemical affinity based on whole-rock chemistry and Nd and Sr isotopes. The epidote-garnet amphibolite originated in an arc tectonic setting and contains relict glaucophane, showing blueschist-facies metamorphism (MD1) prior to amphibolite-facies recrystallization (MD2) that formed barroisite and paragonite. The Rb–Sr garnet-whole-rock isochron (289 ± 58 Ma) could represent the timing of blueschist-facies metamorphism. In contrast, the Rb-Sr barroisite-paragonite isochron of 67 ± 13 Ma is an errorchron or mixed age due to insufficient equilibrium with the whole-rock Sr isotope composition, with no geologic significance. The garnet-zoisite amphibolite formed in a mid-oceanic ridge setting and preserves relicts of eclogite-facies paragenesis (MR2a), including zoisite, kyanite, omphacite, and magnesiohornblende, followed by amphibolite-facies metamorphism (MR2b) represented by actinolite and then by a later MR3 event that resulted in the formation of edenite and pargasite. The Rb–Sr mineral isochron (244 ± 28 Ma) defined by zoisite + magnesiohornblende/actinolite + edenite/pargasite represents the time at which the rock recrystallized in the amphibolite facies (MR2b) or cooled (MR3) through ~ 500 °C (the closure temperature of amphibole), indicating that eclogite-facies metamorphism occurred before ca. 244 Ma. The two Permo-Triassic isochron ages (289–244 Ma) indicate that the high-pressure metamorphism of the basement in the Ohmachi Seamount occurred by ancient subduction rather than along the modern subduction zone. The different protoliths and P–T conditions of amphibolites exposed in the serpentine mélange of the Ohmachi Seamount represent a mixture of rocks exhumed to the Earth’s surface from various depths in the subducted complex, which are interpreted as evidence for a fossil subduction channel preserved in a modern intra-oceanic arc.
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References
Agard P, Yamato P, Jolivet L, Burov E (2009) Exhumation of oceanic blueschists and eclogites in subduction zones: Timing and mechanisms. Earth Sci Rev 92:53–79
Bloomer SH (1983) Distribution and origin of igneous rocks from the landward slopes of the Mariana Trench: Implications for its structure and evolution. J Geophys Res 88:7411–7428
Bloomer SH, Taylor B, MacLeod CJ, Stern R, Fryer P, Hawkins JW, Johnson L (1995) Early arc volcanism and the ophiolite problem: A perspective from drilling in the western Pacific. In: Taylor B, Natland J (eds) Active margins and marginal basins of the Western Pacific (Geophys Monogr 88). AGU, Washington DC, pp 1–30
Burton KW, Kohn MJ, Cohen AS, O’Nions RK (1995) The relative diffusion of Pb, Nd, Sr and O in garnet. Earth Planet Sci Lett 133:199–211
Drăgusanu C, Tanaka T (1999) 1.57-Ga magmatism in the South Carpathians: Implications for the Pre-Alpine basement and evolution of the mantle under the European Continent. J Geol 107:237–248
Droop GTR (1987) A general equation for estimating Fe3+ concentrations in ferromagnesian silicates and oxides from microprobe analyses, using stoichiometric criteria. Mineral Mag 51:431–435
Eggins SM, Woodhead JD, Kinsley LPJ, Mortimer GE, Sylvester P, McCulloch MT, Hergt JM, Handler MR (1997) A simple method for the precise determination of ≥ 40 trace elements in geological samples by ICP-MS using enriched isotope internal standardization. Chem J 134:311–326
Ernst WG, Liou JG (2008) High- and ultrahigh-pressure metamorphism: Past results and future prospects. Am Mineral 93:1771–1786
Ernst WG, Liu J (1998) Experimental phase–equilibrium study of Al– and Ti–contents of calcic amphibole in MORB— A semiquantitative thermobarometer. Am Mineral 83:952–969
Faryad SW (1995) Phase petrology of mafic blueschists of the Meliata Unit (West Carpathians)-Slovakia. J Metamorp Geol 13:432–448
Faryad SW, Jedlicka R, Collett S (2013) Eclogite facies rocks of the Monotonous unit, clue to Variscan suture in the Moldanubian Zone (Bohemian Massif). Lithos 179:353–363
Federico L, Crispini L, Scambelluri M, Capponi G (2007) Ophiolite mélange zone records exhumation in a fossil subduction channel. Geology 35:499–502
Fryer P (1992) A synthesis of Leg 125 drilling of serpentinite seamounts on the Mariana and Izu-Bonin forearcs. Proceeding ODP Sci Results 125:593–614
Gerya TV, Stöckhert B, Perchuk AL (2002) Exhumation of high-pressure metamorphic rocks in a subduction channel: A numerical simulation. Tectonics 21:1056. doi:https://doi.org/10.1029/2002TC001406
Goldstein SL, O’Nions RK, Hamilton PJ (1984) A Sm–Nd study of atmospheric dusts and particulates from major river system. Earth Planet Sci Lett 70:221–236
Guillot S, Hattori KH, de Sigoyer J, Nägler T, Auzende AL (2001) Evidence of hydration of the mantle wedge and its role in the exhumation of eclogites. Earth Planet Sci Lett 193:115–127
Guillot S, Hattori K, Agard P, Schwartz S, Vidal O (2009) Exhumation processes in oceanic and continental subduction contexts: A review. In: Lallemand S, Funiciello F (eds), Subduction Zone Geodynamics. pp 175–205
Hamilton PH, O’Nions RK, Bridgewater D, Nutman A (1983) Sm-Nd studies of Archean metasediments and metavolcanics from West Greenland and their implications for the Earth’s early history. Earth Planet Sci Lett 62:263–272
Hall R, Fuller M, Ali JR, Anderson CD (1995) The Philippine Sea Plate: magnetism and reconstructions. In: Taylor B, Natland J (eds) Active margins and marginal basins of the Western Pacific. Geophys Monogr, vol 88. AGU, Washington DC, pp 371–404
Harland WB, Armstrong RL, Cox AV, Craig LE, Smith AG, Smith DG (1990) A Geologic time scale 1989. Cambridge University Press, Cambridge, 263 pp
Hickey-Vargas R (2005) Basalt and tonalite from the Amami Plateau, northern West Philippine Basin: new Early Cretaceous ages and geochemical results, and their petrologic and tectonic implications. Island Arc 14:653–665
Hickey-Vargas R, Ishizuka O, Bizimis M (2013) Age and geochemistry of volcanic clasts from DSDP Site 445, Daito Ridge and relationship to Minami-Daito Basin and early Izu-Bonin arc magmatism. J Asian Earth Sci 70–71:193–208
Hilde TC, Lee CS (1984) Origin and evolution the West Philippine Basin: A new interpretation. Tectonophysics 102:85–104
Hirauchi K, Michibayashi K, Ueda H, Katayama I (2010) Spatial variations in antigorite fabric across a serpentinite subduction channel: Insights from the Ohmachi Seamount, Izu-Bonin frontal arc. Earth Planet Sci Lett 299:196–206
Holland T, Blundy J (1994) Non-ideal interactions in calcic amphiboles and their bearing on amphibole-plagioclase thermometry. Contrib Mineral Petrol 116:433–447
Imayama T (2016) Whole rock chemistry of S-type leucogranites in far-eastern Nepal. Bull Okayama Univ Sci A 52:55–61
Imayama T, Oh CW, Baltybaev SK, Park CS, Yi K, Jung H (2017) Paleoproterozoic high-pressure metamorphic history of the Salma eclogite on the Kola Peninsula. Russia Lithosphere 9:855–873
Ishii T (1985) Dredged samples from the Ogasawara fore-arc seamount or “Ogasawara paleoland”- “forearc ophiolite”. In: Nasu N, Kobayashi K, Kushiro I, Kagami H (eds) Formation of active ocean margins. Terra Scientific Publishing, Tokyo, pp 307–342
Ishiwatari A, Yanagida Y, Li YB, Ishii T, Haraguchi S, Koizumi K, Ichiyama Y, Umeka M (2006) Dredge petrology of the boninite- and adakite-bearing Hahajima Seamount of the Ogasawara (Bonin) forearc: An ophiolite or a serpentinite seamount? Island Arc 15:102–118
Ishizuka O, Kimura JI, Li YB, Stern RJ, Reagan MK, Taylor RN, Ohara Y, Bloomer SH, Ishii T, Hargrove US III, Haraguchi S (2006) Early stages in the volcanism: new age, chemical and isotopic constraints. Earth Planet Sci Lett 250:385–401
Ishizuka O, Tani K, Reagan MK, Kanayama K, Umino S, Harigane Y, Sakamoto I, Miyajima Y, Yuasa M, Dankley DJ (2011) The timescales of subduction initiation and subsequent evolution of an oceanic island arc. Earth Planet Sci Lett 306:229–240
Iwamori H (2000) Deep subduction of H2O and deflection of volcanic chain towards backarc near triple junction due to lower temperature. Earth Planet Sci Lett 181:41–46
Krebs M, Schertl HP, Maresch WV, Draper G (2011) Mass flow in serpentinite-hosted subduction channels: P–T–t path patterns of metamorphic blocks in the Rio San Juan mélange (Dominican Republic). J Asian Earth Sci 42:569–595
Li S, Jagoutz E, Chen Y, Li Q (2000) Sm–Nd and Rb–Sr isotopic chronology and cooling history of ultrahigh pressure metamorphic rocks and their country rocks at Shuanghe in the Dabie Mountains, Central China. Geochim Cosmochim Acta 64:1077–1093
Maekawa H, Shozui M, Ishii T, Fryer P, Pearce J (1993) Blueschist metamorphism in an active subduction zone. Nature 364:520–523
Maruyama S, Liou JG, Terabayashi M (1996) Blueschists and eclogites of the world and their exhumation. Inter Geol Rev 38:485–594
Mezger K, Essene EJ, Halliday AN (1992) Closure temperatures of the Sm–Nd system in metamorphic garnet. Earth Planet Sci Lett 113:397–409
Morishita T, Suzuki K (1993) XRF analyses of the Mitsuhashi granite in the Shitara area, Aichi Prefecture. Bull Nagoya Univ Museum 9:77–90
Nakazaki M, Tsuboi M, Kanagawa K, Kato T, Suzuki K (2004) Quantitative chemical analysis of rocks with X-ray fluorescence analyzer XRF-1800. Bull Nagoya Univ Museum 20:79–91
Niida K, Izumino T, Ishii I, Ishii T (2005) Mineralogical variations of suboceanic peridotites: Unique characteristics of upper mantle peridotites from the Izu-Ogasawara-Mariana arc ~ back-arc basin areas. Chikyu Monthly Extra-number 52:165–173
Nishimura A (1992) Carbonate bioclasts of shallow-water origin at Site 793. Proceeding ODP Sci Results 126:231–234
Okay AI, Arman MB, Göncüoglu MC (1985) Petrology and phase relations of the kyanite-eclogites from eastern Turkey. Contrib Mineral Petrol 91:196–204
Okino K, Shimakawa Y, Nagaoka S (1994) Evolution of the Shikoku Basin. J Geomagn Geoelectr 46:463–479
Platt JP (1993) Exhumation of high-pressure rocks: a review of concept and processes. Terra Nova 5:119–133
Rebay G, Powell R (2002) The formation of eclogite facies meta-troctolites and a general petrogenetic grid in Na2O-CaO-FeO-MgO-Al2O3-SiO2-H2O (NCFMASH). J Metamorp Geol 20:813–826
Schwartz S, Allemand P, Guillot S (2001) Numerical model of the effect of serpentinites on the exhumation of eclogitic rocks: insights from the Monviso ophiolitic massif (western Alps). Tectonophysics 42:193–206
Sneeringer M, Hart SR, Shimizu N (1984) Strontium and samarium diffusion in diopside. Geochim Cosmochim Acta 48:1589–1608
Steiger R, Jäger E (1977) Subcommission on geochronology: convention on the use of decay constants in geo- and cosmo-chronology. Earth Planet Sci Lett 36:359–362
Stern RJ (2004) Subduction initiation: spontaneous and induced. Earth Plane Sci Lett 226:275–292
Stern RJ, Bloomer SH (1992) Subduction zone infancy: examples from the Eocene Izu-Bonin-Mariana and Jurassic California Arcs. Geol Soc Am Bull 104:1621–1636
Tsujimori T, Ernst WG (2014) Lawsonite blueschists and lawsonite eclogites as proxies for paleo-subduction zone processes: A review. J Metamorp Geol 32:437–454
Ueda H, Usuki T, Kuramoto Y (2004) Intra-oceanic unroofing of eclogite-facies rocks in the Omachi Seamount, Izu-Bonin frontal arc. Geology 32:849–852
Ueda H, Niida K, Usuki T, Hirauchi K, Meschede M, Miura R, Ogawa Y, Yuasa M, Sakamoto I, Chiba T, Ijimino T, Kuramoto Y, Azuma T, Takeshita T, Imayama T, Miyajima Y, Saito T (2011) Seafloor Geology of the Basement Serpentinite Body in the Ohmachi Seamount (Izu-Bonin Arc) as Exhumed Parts of a Subduction Zone within the Philippine Sea. In: Ogawa Y, Anma R, Dilek Y (eds), Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin: submersible studies and recent advances, Springer 8, pp 97–128
Whitney DL, Evans BW (2010) Abbreviations for names of rock-forming minerals. Am Mineral 95:183–187
Yamamoto K, Masutani Y, Nakamura N, Ishii T (1992) REE characteristics of mafic rocks a fore-arc seamount in the Izu-Ogasawara region, western Pacific. Geochem J 26:411–423
Yamamoto K, Asahara Y, Maekawa H, Sugitani K (1995) Origin of blueschist-facies clasts in the Mariana forearc, Western Pacific. Geochem J 29:259–275
Yuasa M, Nishimura A, Niida K, Ishizuka O (1999) Tertiary system near the volcanic front of central Izu-Ogasawara Arc: Geology of the Ohmachi Seamount. Chikyu Monthly Extra-number 23:107–115
Acknowledgements
The authors wish to thank Kazuhiro Suzuki (Nagoya University) for kind assistance with XRF analyses. The authors greatly appreciate Masatoshi Shiba (Hirosaki University) for mineral chemistry analyses using EPMA in his facility. We thank Jakub Trubač and anonymous reviewer for constructive and critical reviews that significantly helped to improve the manuscript. We also thank Lutz Nasdala and Shah Wali Faryad for careful editorial handling and constructive comments.
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Imayama, T., Ueda, H., Usuki, T. et al. Variability of protoliths and pressure-temperature conditions of amphibolites from the Ohmachi Seamount (Izu-Bonin-Mariana arc): evidence of a fossil subduction channel in a modern intra-oceanic arc. Miner Petrol 114, 305–318 (2020). https://doi.org/10.1007/s00710-020-00705-z
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DOI: https://doi.org/10.1007/s00710-020-00705-z