Geochemical secular variation of magma source during Early to Middle Miocene time in the Niigata area, NE Japan: Asthenospheric mantle upwelling during back-arc basin opening

Shuto, Kenji; Ishimoto, H.; Hirahara, Yuka; Sato, Makoto; Matsui, Kohji; Fujibayashi, Norie; Takazawa, Eiichi; Yabuki, Kaori; Sekine, Masamichi; Kato, Masayasu; Rezanov, Andrey I.

doi:10.1016/j.lithos.2005.06.001

Cited by 115 publications

(63 citation statements)

References 41 publications

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“…Samples from Group 2 show (La/Yb)n of 1.22-2.61, Sm/Nd of 0.28-0.35, and Ti/V of 20-50, and plot in the field of the back-arc basin basalt (BABB) in Figs. 3a-d, 14c and d (e.g., Pouclet et al, 1995;Shuto et al, 2006;Sandeman et al, 2006). Thus, Group 2 might originate from a metasomatised E-MORB-like source in the back-arc environment.…”

Section: Group 2: E-morb-like Source Modified By Subducted Componentmentioning

confidence: 99%

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Wang

Zhang

Cawood

et al. 2013

Precambrian Research

226

121

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Keywords:Metabasic rocks MORB-and/or arc-like geochemical signatures Earliest Neoproterozoic Arc and back-arc system Eastern South China Block Periphery of Rodinia a b s t r a c t U-Pb geochronology along with elemental and Nd-Hf-Os isotopic data from the earliest Neoproterozoic metabasic rocks within the Cathaysia Block of the South China Block (SCB) constrain the tectonic setting and paleogeography of the block within the Rodinia supercontinent. The metabasic rocks give zircon U-Pb ages of 969-984 Ma, ε Hf (t) values of +1.8 to +15.3 and Hf model ages of 0.92-1.44 Ga. They are subalkaline basalts that can be geochemically classified into four groups. Group 1 has low Nb contents (1.24-4.33 ppm), highly positive ε Nd (t) values (+4.3 to +5.2), and REE and multi-elemental patterns similar to fore-arc MORB-type basalt. Group 2 has Nb contents ranging from 3.13 ppm to 6.48 ppm, ε Nd (t) of +3.1 to +6.2, low Re and Os contents and high initial Os isotopic ratios, and displays an E-MORB geochemical signature. Group 3 has Nb = 7.18-29.87 ppm, Nb/La = 0.60-1.40, Nb/U = 5.0-37, Ce/Pb = 1.1-6.6, ε Nd (t) = +2.9 to +7.0, 187 Re/ 188 Os = 5.87-8.87 and ␥Os (t) = 178-772, geochemically resembling to the Pickle Nb-enriched basalt. Group 4 has strong LREE/HREE and HREE fractionation and high ε Nd (t) values (+2.3 to +5.6), and is characterized by similar element patterns to arc volcanic rocks. Serpentinites coeval to Group 4 show 187 Os/ 188 Os of 0.1143-0.1442 and ␥Os (t) of −7.8 to +0.1. Groups 1 and 2 are interpreted to originate from the N-MORB and E-MORB-like sources with the addition of an arc-like component, genetically linked to fore-and back-arc settings, respectively. Groups 3 and 4 show inputs of newly subduction-derived melt and fluid in the wedge source. These geochronological and geochemical signatures fingerprint the development of an earliest Neoproterozoic (∼970 Ma) arc-back-arc system along the Wuyi-Yunkai domain of the Cathaysia Block. Regional relationships indicate that the Wuyi-Yunkai arc-back-arc system was one of a series of separate convergent margin settings, which included the Shuangxiwu (∼970-880 Ma) and Jiangnan (∼870-820 Ma) systems that developed in the SCB. The formation and closure of these arc-back-arc systems resulted in the northwestwardly episodic amalgamation of various pieces of the Yangtze and Cathaysia to finally form the SCB. These signatures require the SCB to occupy an exterior accretionary orogen along the periphery of Rodinia during 990-820 Ma, rather than to have formed through Mesoproterozoic Sibao orogenesis within the interior of Rodinia.

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Section: Group 2: E-morb-like Source Modified By Subducted Componentmentioning

confidence: 99%

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Wang

Zhang

Cawood

et al. 2013

Precambrian Research

226

121

View full text Add to dashboard Cite

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“…It has been suggested that temporal changes occur in the source of Tertiary -Quaternary basaltic rocks of the back -arc side of the NE Japan arc in association with the spreading of the Japan Sea back -arc basin (e.g., Kurasawa and Konda, 1986;Nohda and Wasserburg, 1986;Nohda et al 1988;Tatsumi et al, 1988;Shuto et al, 1993;Shuto et al, 2006). These studies point out that the Sr -Nd isotopic compositions of basaltic rocks changed from high Sr and low Nd compositions to low Sr and high Nd isotopic compositions at around 15 Ma.…”

Section: Magmatic Activity and Origin Of The Source Of Miocene Igneoumentioning

confidence: 99%

Petrology and geochemistry of Miocene igneous rocks on Rebun Island, northern Hokkaido, Japan

Hirahara¹,

Shuto²

2008

Journal of Mineralogical and Petrological Sciences

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We identify four stages in the Miocene magmatic activity on Rebun Island, northern Hokkaido, Japan: Stage I (18 Ma), Stage II (13 Ma), Stage III (10 Ma), and Stage IV (<10 Ma). Stages I and II produced small intrusions of dolerite and dacite, respectively. During Stage III, basalt to andesite lavas erupted, while the magmatism of Stage IV formed large intrusions of dolerite, porphyrite, and andesite with dacitic veins. The large variations of major and trace element compositions of Stage III and IV rocks can be explained by considering the fractional crystallization of a basaltic melt; however, the proportion of phases fractionating is different for the two stages.

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“…As rochas adakiticas posicionam-se próximas aos adakitos modernos filipinos e equatorianos (Equador: Iliniza Volcanic Complex, Hidalgo et al 2007;Monglo, Filipinas -Payot et al 2007) e próximos também a adakitos arqueanos (Província Superior, Austrália-Percival et al 2003;White Flag Lake, Australia-Morris & Witt 1997). A suite cálcio-alcalina se posicionou próxima a rochas cálcio-alcalinas de retro-arco japonesas (Shuto et al 2006), das ilhas Raoul no arco de Kermadec (Smith et al 2006) e também de cálcio-alcalinas dos Andes Centrais (Matteini et al 2002). Este diagrama também faz referência a rochas cálcio-alcalinas de rifte (Kabeto et al 2001); andesitos de alto magnésio da Península Antartica (Alabaster & Storey 1990) e a adakitos pós colisionais do Tibet (Guo et al 2007).…”

Section: Para As Rochas Vulcânicas Do Gbri (Campos Preenchidos) E Runclassified

Caracterização de vulcânicas adakíticas e cálcio-alcalinas no greenstone belt do rio Itapicuru, Bahia: petrogênese e implicações geodinâmicas

Ruggiero

Oliveira

2010

RBG

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Resumo Novos dados geoquímicos para as rochas vulcânicas da Unidade Maria Preta, Greenstone Belt do Rio Itapicuru, revelaram a presença de dois grupos distintos: um de rochas com afinidade adakítica e outro cálcio-alcalina. A suíte adakítica ocorre na porção oeste da Unidade Maria Preta e é caracterizada por altos valores de Sr/Y, Ti/Y N >1 e pelo enriquecimento em elementos de baixo potencial iônico (LFSE) em relação aos de elevado potencial iônico (HFSE) e também pelo moderado fracionamento dos elementos terras raras. A suíte cálcio-alcalina, que aflora na porção leste, apresenta baixas razões Sr/Y, Ti/Y N <1, menor fracionamento de elementos terras raras e anomalias negativas de Eu. Dados de isótopos de Sm-Nd, recalculados para (2170 Ma) forneceram valores de ε Nd de +4,78 a +2,55 para a suíte adakítica e de +1,37 a + 1,90 para a suíte cálcio-alcalina, sugerindo que as duas suítes podem ter sido geradas em contexto de zona de subducção. Os dois grupos vulcânicos não se relacionam por cristalização fracionada e provavelmente foram derivados de fontes distintas (diferentes razões iniciais Nd). A geoquímica das vulcânicas cálcio-alcalinas foi atribuída à fusão da cunha do manto metassomatizado por fluídos liberados a partir de uma crosta oceânica subductada, seguido por fracionamento de plagioclásio no magma. Por outro lado, a geoquímica dos adakítos requer fusão de meta-basaltos hidratados com granada e/ou hornblenda residual. Esta suíte não apresenta indícios de interação significativa com a cunha do manto, como em adakitos atuais, face aos baixos valores de Cr e Ni. A distribuição geográfica das duas suítes sugere subducção de crosta oceânica para oeste, caso sejam da mesma idade.Palavras-chave: Vulcânicas félsicas, Adakitos, Cálcio-alcalinas, Geoquímica, Greenstone belt do Rio Itapicuru. Abstract Characterization of adakitic and calc-alkaline volcanic rocks in the Rio Itapicuru Greenstone Belt, Bahia: Petrogenesis and geodynamic implications. New geochemical data for andesites anddacites of the Maria Preta Unit, Rio Itapicuru Greenstone Belt, revealed two distinct geochemical groups: one of adakitic affinity and another calc-alkaline. The adakitic suite, localized to the west in the unit, is characterized by high values of Sr/Y, Ti/Y N >1; it shows enrichment in LFSE (Low Field Strength Elements) relative to HFSE (High Field Strength Elements) and moderate rare earth elements fractionation. The calc-alkaline suite shows low Sr/Y ratios, lower rare earth elements fractionation and negative Eu anomalies. It also shows high abundances of incompatible elements (Y, Zr, Th) and high Cr and Ni concentrations. The most likely mechanism of formation for the calc-alkaline rocks is partial melting of mantle peridotite hydrated by fluids released from the subducting slab, followed by plagioclase fractionation. The two suites cannot be linked to each other by fractional crystallization and have probably derived from distinct magmas (different initial Nd ratios). The adakite geochemical features require partial melt of hy...

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Geochemical secular variation of magma source during Early to Middle Miocene time in the Niigata area, NE Japan: Asthenospheric mantle upwelling during back-arc basin opening

Cited by 115 publications

References 41 publications

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Petrology and geochemistry of Miocene igneous rocks on Rebun Island, northern Hokkaido, Japan

Caracterização de vulcânicas adakíticas e cálcio-alcalinas no greenstone belt do rio Itapicuru, Bahia: petrogênese e implicações geodinâmicas

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