The importance of talc and chlorite “hybrid” rocks for volatile recycling through subduction zones; evidence from the high-pressure subduction mélange of New Caledonia

Spandler, Carl; Hermann, Jörg; Faure, Kevin; Mavrogenes, John; Arculus, R. J.

doi:10.1007/s00410-007-0236-2

Cited by 161 publications

(125 citation statements)

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“…Recent studies of subduction zone mélanges have revealed that significant fluid flow and fluid-rock interaction took place along the slab-mantle interface (Bebout and Barton 1989, 2002Grossman 1989, 1993;King et al 2003King et al , 2006King et al , 2007Breeding et al 2004;Marschall et al 2006;Spandler et al 2008;Miller et al 2009;Penniston-Dorland et al 2010, 2012. The mélanges represent tectonic and metasomatic mixing of sedimentary, mafic, and ultramafic rocks along the interface region at the contact between the subducting slab and the mantle wedge.…”

Section: Introductionmentioning

confidence: 99%

Fluid-metapelite interaction in an ultramafic mélange: implications for mass transfer along the slab-mantle interface in subduction zones

2014

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The slab-mantle interface in subduction zones is a site of tectonic mixing of crustal and mantle rocks. It is the interface for fluid flow of slab-derived components into the mantle wedge. To assess the fluid-rock interaction along the slab-mantle interface, we studied the bleaching of pelitic schist in an ultramafic mélange. The Nishisonogi metamorphic rocks in Kyushu, Japan, comprise ultramafic mélanges intercalated with epidote-blueschist facies schists. The ultramafic mélange consists of tectonic blocks of various lithologies and a matrix of chlorite-actinolite schist and serpentinite. Along the contact with the mélange matrix, pelitic schist blocks are bleached mainly due to the modal increase of albite and the consumption of carbonaceous material. The bleaching is probably attributed to infiltration of Na-rich external fluid from the mélange matrix. Mass balance analysis indicates losses of C, Rb, K 2 O, Ba, Pb, and SiO 2 from the bleached pelitic schist, although Al 2 O 3 , TiO 2 , Sc, Y, Zr, Nb, La, Ce, and Nd remain immobile. This suggests fractionation of large-ion lithophile elements (LILE) and Pb from the high-field-strength elements and rare earth elements during the bleaching. If this ultramafic mélange is analogous to the slab-mantle interface, similar infiltration metasomatism will promote liberation of C, Si, LILE, and Pb from subducting metapelites and enhance metasomatism of the mantle wedge.

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Section: Introductionmentioning

confidence: 99%

Fluid-metapelite interaction in an ultramafic mélange: implications for mass transfer along the slab-mantle interface in subduction zones

2014

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“…In principle, fluids in the subduction zone may originate from (I) the partly serpentinised, subducted mantle peridotite underneath the oceanic crust (Hyndman and Peacock, 2003;Ranero et al, 2003), (II) the altered oceanic crust (AOC; e.g. Becker et al, 2000;John et al, 2008;Peacock, 1993), (III) subducted marine sediments (Plank and Langmuir, 1993;Rüpke et al, 2002), and (IV) the mélange zone of the slab-wedge interface (Bebout, 2007;King et al, 2006;Spandler et al, 2008). Fluids circulating in the subduction zone may inherit the M A N U S C R I P T…”

Section: Introductionmentioning

confidence: 99%

Tracing the effects of high-pressure metasomatic fluids and seawater alteration in blueschist-facies overprinted eclogites: Implications for subduction channel processes

Straaten¹,

Halama²,

John³

et al. 2012

Chemical Geology

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Nils, Tracing the effects of high-pressure metasomatic fluids and seawater alteration in blueschist-facies overprinted eclogites: Implications for subduction channel processes, Chemical Geology (2011Geology ( ), doi: 10.1016Geology ( /j.chemgeo.2011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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“…The patterns ranging from slightly concave to flat in the middle and heavy REE are similar to the serpentinites derived from oceanic peridotites and those infiltrated by basaltic melts of Peltonen and Kontinen (2004). The negative Ce and Eu anomalies may indicate hydrothermal interactions, weathering and serpentinization, all of them caused by oceanic waters (D'Orazio et al 2004;Spandler et al 2008;De Hoog et al 2009). …”

Section: Element Mobilitymentioning

confidence: 89%

Lithogeochemistry of the meta-igneous units from Arroio Grande Ophiolitic Complex, southernmost Brazil

Ramos

Koester

2015

Braz. J. Geol.

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ABSTRACT:Ophiolites are defined as slices of genetically-related upper mantle serpentinized peridotites and oceanic crustal rocks, tectonically displaced from its primary igneous origin of formation by plate convergence and associated (meta) sedimentary rocks of marine origin. From this premise, a meta-ultramafic-mafic-sedimentary complex (Cr-rich magnesian schists -upper mantle or crustal ultramafic cumulate candidates; epidote amphibolites, metadiorites and metagabbros -oceanic crust candidates; metasedimentary schists, quartzites and marbles -marine sedimentary rocks candidates), located in southeastern Dom Feliciano Belt (southernmost Brazil), started to be interpreted as possible slices of an ophiolitic complex related to the closure of a paleo-ocean during Brasiliano/Pan-African orogenic cycle and was called Arroio Grande Ophiolitic Complex. The present research fills the lack of geochemical data from previous studies and tests the hypothesis of an oceanic setting for the meta-igneous units of this complex from a lithogeochemistry point of view. The meta-ultramafics were interpreted as peridotites (mantle or crustal cumulates) that were subsequently serpentinized (probably in the ocean floor) and posteriorly metasomatized (probably in a continental setting). The meta-mafics were interpreted as oceanic gabbros/basalts formed in a back-arc basin. The results, together with field relationships, rock associations and petrographic evidences, support an oceanic origin for the protoliths of the meta-igneous units. The hypothesis that these rocks represent metamorphosed slices of an ophiolitic complex is still the most reasonable one. This work updates the geologic knowledge of the area and supports discussions about the evolution of Dom Feliciano Belt and Western Gondwana paleocontinent.

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The importance of talc and chlorite “hybrid” rocks for volatile recycling through subduction zones; evidence from the high-pressure subduction mélange of New Caledonia

Cited by 161 publications

References 103 publications

Fluid-metapelite interaction in an ultramafic mélange: implications for mass transfer along the slab-mantle interface in subduction zones

Fluid-metapelite interaction in an ultramafic mélange: implications for mass transfer along the slab-mantle interface in subduction zones

Tracing the effects of high-pressure metasomatic fluids and seawater alteration in blueschist-facies overprinted eclogites: Implications for subduction channel processes

Lithogeochemistry of the meta-igneous units from Arroio Grande Ophiolitic Complex, southernmost Brazil

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