Dehydration of subducting serpentinite: Implications for halogen mobility in subduction zones and the deep halogen cycle

John, Timm; Scambelluri, Marco; Frische, Matthias; Barnes, Jaime D.; Bach, Wolfgang

doi:10.1016/j.epsl.2011.05.038

Cited by 189 publications

(166 citation statements)

References 86 publications

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“…It has also been demonstrated that fluids in HP metamorphic rocks play a key role in promoting equilibration of isotopic systems used as geochronometers (Glodny et al, 2003(Glodny et al, , 2008. In turn, some isotopic systems may still record the effects of previous seafloor alteration or the isotopic signature of the precursor rock (Halama et al, 2010(Halama et al, , 2011John et al, 2011;Miller et al, 1988;Putlitz et al, 2000).…”

Section: Accepted Manuscriptmentioning

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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Section: Accepted Manuscriptmentioning

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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“…Recent studies of serpentinization at ridges show the increase of F in peridotite sections of oceanic lithosphere up to several 100 s of ppm (Orberger et al 1999;John et al 2011;Debret et al 2013). Fresh MORB contains approximately 100 ppm F, and given that F is insoluble to seawater (1.3 ppm), F content in the basalt section of the oceanic lithosphere must be at least 100 ppm and higher.…”

Section: What Are the Magma Sources?mentioning

confidence: 99%

Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

et al. 2014

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Investigation of olivine-hosted melt inclusions provides information about the abundance of volatile elements that are often lost during subaerial eruptions of lavas. We have measured the abundances of H 2 O, CO 2 , F, Cl, and S as well as Pb isotopes in 29 melt inclusions in the scoria of the 1686 eruption of the Iwate volcano, a frontal-arc volcano in the northeast Japan arc. Pb Isotope compositions identify that Iwate magma is derived from a mixture of depleted mantle, subducted basalt, and sediment. Systematics of F in comparison to MORB and other arc magma indicates that (1) the slab surface temperature must be among the lowest on Earth and (2) hydrous minerals, such as amphibole, humites, and/or mica, must be present as residual phases during the dehydration of the slab.

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“…On the other hand, high concentrations of Cl in Type 4 apatites near the serpentinite xenolith suggest that local enrichment of the pegmatite-forming melt in Cl is a result of contamination by host rocks. Although the data on the concentration of Cl in the Szklary serpentinites is lacking, the sea-floor serpentinites and associated metasediments typically contain significant amounts of Cl that might be released, recycled and locally concentrated in supra-subduction zones (e.g., [55][56][57][58]). It is noteworthy that the Szklary pegmatite is the only known example of a GSB pegmatite emplaced outside the crustal-related GSB geological unit into the geochemically contrasted ophiolitic rock suite of the Szklary Massif.…”

Section: Genetic Implicationsmentioning

confidence: 99%

Chemical Composition of Mn- and Cl-Rich Apatites from the Szklary Pegmatite, Central Sudetes, SW Poland: Taxonomic and Genetic Implications

et al. 2018

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Abstract:Although calcium phosphates of the apatite group (apatites) with elevated contents of Mn are common accessory minerals in geochemically evolved granitic pegmatites, their Mn-dominant analogues are poorly studied. Pieczkaite, M1 Mn 2 M2 Mn 3 (PO 4 ) 3 X Cl, is an exceptionally rare Mn analogue of chlorapatite known so far from only two occurrences in the world, i.e., granitic pegmatites at Cross Lake, Manitoba, Canada and Szklary, Sudetes, SW Poland. In this study, we present the data on the compositional variation and microtextural relationships of various apatites highly enriched in Mn and Cl from Szklary, with the main focus on compositions approaching or attaining the stoichiometry of pieczkaite (pieczkaite-like apatites). The main goal of this study is to analyze their taxonomical position as well as discuss a possible mode of origin. The results show that pieczkaite-like apatites represent the Mn-rich sector of the solid solution M1 (Mn,Ca) 2 M2 (Mn,Ca) 3 (PO 4 ) 3 X (Cl,OH).In the case of cation-disordered structure, all these compositions represent extremely Mn-rich hydroxylapatite or pieczkaite. However, for cation-ordered structure, there are also intermediate compositions for which the existence of two hypothetical end-member species can be postulated: M1 Ca 2 M2 Mn 3 (PO 4 ) 3 X Cl and M1 Mn 2 M2 Ca 3 (PO 4 ) 3 X OH. In contrast to hydroxylapatite and pieczkaite, that are members of the apatite-group, the two hypothetical species would classify into the hedyphane group within the apatite supergroup. The pieczkaite-like apatites are followed by highly Mn-enriched fluor-and hydroxylapatites in the crystallization sequence. Mn-poor chlorapatites, on the other hand, document local contamination by the serpentinite wall rocks. We propose that pieczkaite-like apatites in the Szklary pegmatite formed from small-volume droplets of P-rich melt that unmixed from the LCT-type (Li-Cs-Ta) pegmatite-forming melt with high degree of Mn-Fe fractionation. The LCT melt became locally enriched in Cl through in situ contamination by wall rock serpentinites.

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Dehydration of subducting serpentinite: Implications for halogen mobility in subduction zones and the deep halogen cycle

Cited by 189 publications

References 86 publications

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

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

Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

Chemical Composition of Mn- and Cl-Rich Apatites from the Szklary Pegmatite, Central Sudetes, SW Poland: Taxonomic and Genetic Implications

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