Modern-style subduction processes in the Mesoarchaean: Geochemical evidence from the 3.12 Ga Whundo intra-oceanic arc

Smithies, R. Hugh; Champion, David C.; Kranendonk, Martin J. Van; Howard, Heather M.; Hickman, Arthur H.

doi:10.1016/j.epsl.2004.12.026

Cited by 233 publications

(94 citation statements)

References 44 publications

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“…These signatures, together with the high Nb, P 2 O 5 and TiO 2 contents, argue against crustal assimilation en route. In fact, petrogenesis of the Nb-enriched basalts is generally considered to be unrelated to the shallow-level crustal assimilation (Wyman et al, 2000;Stern, 2002;Castillo et al, 2002Castillo et al, , 2007Smithies et al, 2005;Castillo, 2008). As a result, the correlation in Fig.…”

Section: Group 3: Nb-enriched Basalt From a Newly Metasomatised Wedgementioning

confidence: 67%

“…The fields of the residual peridotite, lava, OIB (plume mantle) and lithospheric mantle are from Shirey and Walker (1998), Widom and Shirey (1996), Widom et al (1999), Xu et al (2007a,b) and Shi et al (2006). assimilation en route, and (3) a mantle wedge metasomatised by a young subduction-derived component (e.g., Storey et al, 1989;Leeman et al, 1990Leeman et al, , 2005Richards et al, 1990;Sajona et al, 1994Sajona et al, , 1996Kepezhinskas et al, 1996;Wyman et al, 2000;Polat and Kerrich, 2001;Stern, 2002;Bourdon et al, 2002;Castillo et al, 2002Castillo et al, , 2007Petrone et al, 2003;Smithies et al, 2005;Castillo, 2008;Petrone and Ferrari, 2008).…”

Section: Group 3: Nb-enriched Basalt From a Newly Metasomatised Wedgementioning

confidence: 99%

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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 3: Nb-enriched Basalt From a Newly Metasomatised Wedgementioning

confidence: 67%

Section: Group 3: Nb-enriched Basalt From a Newly Metasomatised Wedgementioning

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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“…The rocks exhibit typical boninite geochemical fingerprints and they occur within the southern part of the ~3.3 Ga Holenarsipur greenstone belt [9] in the western sector of the Dharwar craton (Figure 1). This new finding essentially bridges the gap between the late Eoarchean [5] and the early Mesoarchean [6], and it provides convincing evidence for the persistence of subduction-related plate tectonic processes throughout the Archean during the Earth's early evolutionary history. …”

mentioning

confidence: 95%

“…Their reported occurrence in the Archean greenstone successions is not very extensive. Nevertheless, there are some classical examples of boninitic magmatism that has been identified in the~3.7 Ga Eoarchean [5],~3.1 Ga Mesoarchean [6], and the~2.7 Ga Neoarchean [7,8] greenstone terranes.In this contribution, we present detailed field, petrography, and geochemistry of the newly identified high-Si high-Mg volcanic rocks from one of the oldest supracrustal sequences of late Paleoarchean age in the Dharwar craton, India. The rocks exhibit typical boninite geochemical fingerprints and they occur within the southern part of the~3.3 Ga Holenarsipur greenstone belt [9] in the western sector of the Dharwar craton (Figure 1).…”

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confidence: 99%

Boninites in the ~3.3 Ga Holenarsipur Greenstone Belt, Western Dharwar Craton, India

et al. 2018

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Abstract:In this contribution, we present detailed field, petrography, mineral chemistry, and geochemistry of newly identified high-Si high-Mg metavolcanic rocks from the southern part of the~3.3 Ga Holenarsipur greenstone belt in the western Dharwar craton, India. The rocks occur as conformable bands that were interleaved with the mafic-ultramafic units. The entire volcanic package exhibits uniform foliation pattern, and metamorphosed under greenschist to low grade amphibolite facies conditions. The rocks are extremely fine grained and exhibit relict primary igneous textures. They are composed of orthopyroxene and clinopyroxene phenocrysts with serpentine, talc, and amphibole (altered clinopyroxene). Cr-spinel, rutile, ilmenite, and apatite occur as disseminated minute grains in the groundmass. The mineralogical composition and the geochemical signatures comprising of high SiO 2 (~53 wt. %), Mg# (~83), low TiO 2 (~0.18 wt. %), and higher than chondritic Al 2 O 3 /TiO 2 ratio (~26), reversely fractionated heavy rare earth elements (REE) (Gd N /Yb N~0 .8), resulting in concave-up patterns, and positive Zr anomaly, typically resembled with the Phanerozoic boninites. Depletion in the high field strength elements Nb, and Ti relative to Th and the REE in a primitive mantle normalized trace element variation diagram, cannot account for contamination by pre-existing Mesoarchean continental crust present in the study area. The trace element attributes instead suggest an intraoceanic subduction-related tectonic setting for the genesis of these rocks. Accordingly, the Holenarsipur high-Si high-Mg metavolcanic rocks have been identified as boninites. It importantly indicates that the geodynamic process involved in the generation of Archean boninites, was perhaps not significantly different from the widely recognized two-stage melt generation process that produced the Phanerozoic boninites, and hence provides compelling evidence for the onset of Phanerozoic type plate tectonic processes by at least~3.3 Ga, in the Earth's evolutionary history.Keywords: boninite; komatiite; Mesoarchean; Holenarsipur; Dharwar craton; India IntroductionBoninites, and boninite-series volcanic rocks have been widely recognized in the Phanerozoic intraoceanic arc systems [1,2], and the Ophiolites, [3,4]. They are produced by the partial melting of a prior depleted refractory mantle wedge, metasomatized by subducted slab-derived fluids during the initial stages of the melt generation process. Their reported occurrence in the Archean greenstone successions is not very extensive. Nevertheless, there are some classical examples of boninitic magmatism that has been identified in the~3.7 Ga Eoarchean [5],~3.1 Ga Mesoarchean [6], and the~2.7 Ga Neoarchean [7,8] greenstone terranes.In this contribution, we present detailed field, petrography, and geochemistry of the newly identified high-Si high-Mg volcanic rocks from one of the oldest supracrustal sequences of late Paleoarchean age in the Dharwar craton, India. The rocks exhibit typical boninite geochem...

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“…However, compared with Phanerozoic typical high-Mg andesite that is generally characterized by SiO 2 of 54-65%, MgO of >5%, CaO of <10% and high mg number (>45) (Kelemen, 1995), most of them have higher CaO contents (>10%) and are distinguishable from the former. In contrast, all amphibolites possessing high Si, high Mg and low Ti contents resemble Phanerozoic (e.g., Crawford et al, 1989;Falloon et al, 2007Falloon et al, , 2008 and Archean boninites (e.g., Kerrich et al, 1998;Polat et al, 2002;Smithies, 2002;Smithies et al, 2004aSmithies et al, , 2005Naqvi et al, 2006), according to the IUGS classification (Le Bas, 2000). In the plots of Zr versus Ti and La/Sm versus TiO 2 ( Fig.…”

Section: Petrological Classificationmentioning

confidence: 99%

Neoarchean siliceous high-Mg basalt (SHMB) from the Taishan granite–greenstone terrane, Eastern North China Craton: Petrogenesis and tectonic implications

Peng

Wilde

et al. 2013

Precambrian Research

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Modern-style subduction processes in the Mesoarchaean: Geochemical evidence from the 3.12 Ga Whundo intra-oceanic arc

Cited by 233 publications

References 44 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

Boninites in the ~3.3 Ga Holenarsipur Greenstone Belt, Western Dharwar Craton, India

Neoarchean siliceous high-Mg basalt (SHMB) from the Taishan granite–greenstone terrane, Eastern North China Craton: Petrogenesis and tectonic implications

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