Oceanic island basalts in accretionary complexes of SW Japan: Tectonic and petrogenetic implications

Safonova, Inna; Kojima, Soichi; Nakae, Satoshi; Romer, Rolf L.; Seltmann, Reimar; Sano, Hidehiko; Onoue, Tetsuji

doi:10.1016/j.jseaes.2014.09.015

Cited by 55 publications

(40 citation statements)

References 67 publications

(135 reference statements)

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“…First, based on geological data Sano and Kojima (2000) proposed that the Mino-Tamba Permian limestones formed on a cap of an oceanic seamount. Later it was confirmed by the occurrence of the OIB-type basalts underneath Ichiyama et al, 2008;Safonova et al, 2009Safonova et al, , 2015a.…”

mentioning

confidence: 83%

“…The presence of Type 5 OPS is typically indicative of large and mature oceanic plates moving over hot spots related to mantle plumes (Safonova et al, 2009(Safonova et al, , 2015bSafonova and Santosh, 2014). In SW Japan, Type 5 OPS is present in the Akiyoshi, Mino-Tamba and Southern Chichibu ACs hosting accreted oceanic islands probably formed over mature oceanic plates Kanmera and Sano, 1991; A C C E P T E D M A N U S C R I P T (Safonova et al, 2015a).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…OPS hosting accretionary complexes of Japan formed in the Paleo-Pacific Ocean, during a long period from the Carboniferous until the Cenozoic (e.g., Isozaki et al, 1990;2010;Maruyama et al, 1997;Safonova et al, 2009Safonova et al, , 2015a Taira and Tashiro, 1980;Taira et al, 1988;Sano, 1988Sano, , 2006Isozaki et al, 1990;Wakita, 2000;Onoue et al, 2004;Safonova et al, 2009Safonova et al, , 2015a; Table 1). …”

Section: Description Of Ops Type Localities Of Sw Japanmentioning

confidence: 99%

“…Therefore, the careful study of relationships between various OPS rocks is a reliable method for the understanding of the present structure and the past history of accretionary complexes and their hosting P-type orogenic belts. Kanmera and Sano, 1991;Uchio et al, 2004;Safonova et al, 2008Safonova et al, , 2011Safonova et al, , 2015a. Therefore the OPS model is a key point in understanding the formation of oceanic volcanic rocks in space and time.…”

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confidence: 99%

“…We studied basalts from three localities of the Mino-Tamba AC in the central Honshu Complex was studied along the Onyu River of the Shimo-Negori area south of Obama (Safonova et al, 2015a). The Sekumi volcanics from the Yashiro location occur as small blocks of tectonic mélange without clear contacts with fossil-bearing sediments.…”

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confidence: 99%

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Description Of Ops Type Localities Of Sw Japanmentioning

confidence: 99%

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confidence: 99%

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Petrogenesis and tectonic implication of the Late Mesozoic volcanic rocks in East Mongolia

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This paper presents new geochemical and geochronological data of the Late Mesozoic volcanic rocks in East Mongolia. These volcanic rocks belong to high‐K calc‐alkaline and shoshonitic series and exhibit features of bimodal rocks. The mafic rocks have elevated incompatible trace element concentrations and significantly negative Nb, Ta, and Ti anomalies, with 87Sr/86Sr(i) and ƐNd(t) values of 0.70502–0.70572 and −1.72459 to +1.720736, respectively, which suggest that the mafic magma was derived from a lithospheric mantle source that might have been metasomatized by subduction‐derived fluids, experienced fractional crystallization, and was contaminated by crustal materials. The felsic rocks have similar rare earth element patterns to the mafic rocks but show much more significantly negative Eu and Sr anomalies. The felsic rocks have higher 87Sr/86Sr(i) values of 0.706496–0.71104 than the mafic rocks but similar ƐNd(t) values (−0.28003 to +2.928506) to the mafic ones. These data indicate that the felsic rocks originated from partial melting of a crustal source that is dominated by juvenile mafic rocks. Our new K‐Ar dating, together with previous data, shows that the Late Mesozoic volcanism in East Mongolia took place during the Late Jurassic‐Early Cretaceous between ca. 155 and 99 Ma. The model of back‐arc extension, possibly induced by slab rollback of the westward subducted Pacific Plate and the subduction zone retreat, can explain the geodynamic setting and the eastward younging trend of the Late Mesozoic volcanism in East Mongolia and in adjacent NE China.

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Accreted seamounts in the South Tianshan Orogenic Belt, NW China

Yang

et al. 2018

Geological Journal

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The South Tianshan Orogenic Belt (STOB) is situated in the southwest margin of the Central Asian Orogenic Belt and is characterized by the distribution of ophiolitic mélanges and metamorphic rocks. In this study, we focus on 5 ophiolitic mélanges with ocean island basalt (OIB) and aim to discuss the tectonic evolution of the South Tianshan Ocean. The Kynda, Kainar, Uchkel, Heiyingshan, and Guluogou ophiolitic mélanges in STOB mainly consist of metamorphic peridotite, gabbros, basaltic lavas (pillows), abyssal radiolarian cherts, and limestones. The basaltic rocks mainly occur as tectonic blocks within the mélanges. These basaltic rocks are characterized by LREE enrichment and HREE depletion, very weak or no Eu anomalies, and no obvious Nb, Ta, and Ti negative anomalies, positive εNd(t) values, relatively high initial 87Sr/86Sr ratios, and wide 206Pb/204Pb ratios, showing the signature of OIB. The OIB‐type rocks from Kynda, Kainar, and Guluogou are likely to be derived from garnet lherzolite by relatively high degrees of melting (10% to 20%). But the basaltic rocks of Uchkel and Heiyingshan formed at significantly lower degrees of partial melting (1% to 5%) of spinel and/or garnet lherzolite. The OIB‐type rocks in these ophiolitic mélanges are considered as accreted seamount fragments and may represent mantle plume‐related magmatism within the South Tianshan Ocean. In combination with previous work, we suggest an updated model, which is bidirectional oceanic subduction with seamounts accretion and subduction system, is suitable for Palaeozoic tectonic evolution of the South Tianshan Ocean.

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Oceanic island basalts in accretionary complexes of SW Japan: Tectonic and petrogenetic implications

Cited by 55 publications

References 67 publications

Recognizing OIB and MORB in accretionary complexes: A new approach based on ocean plate stratigraphy, petrology and geochemistry

Recognizing OIB and MORB in accretionary complexes: A new approach based on ocean plate stratigraphy, petrology and geochemistry

Petrogenesis and tectonic implication of the Late Mesozoic volcanic rocks in East Mongolia

Accreted seamounts in the South Tianshan Orogenic Belt, NW China

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