Trace elements in zircon and coexisting minerals from low-T/UHP metagranite in the Dabie orogen: Implications for action of supercritical fluid during continental subduction-zone metamorphism

Xia, Qiong‐Xia; Zheng, Yong‐Fei; Hu, Zhaochu

doi:10.1016/j.lithos.2009.09.013

Cited by 126 publications

(94 citation statements)

References 140 publications

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“…This indicates significant action of fluids on the protolith zircon at subsolidus to supersolidus conditions (Zheng, 2009). Dissolution of the protolith zircon becomes more efficient in supercritical fluids than in aqueous solutions and hydrous melts (Xia et al, 2010). This leads to metamorphic recrystallization of the protolith zircon via the mechanism of dissolution-reprecipitation (Figure 7).…”

Section: Action Of Subduction-zone Fluids Accessary Mineral Records Omentioning

confidence: 99%

“…This difference may be the reason why continental subduction zones generally have lower geotherms than the hot oceanic subduction zones. It is the low geotherms for HP blueschist-to eclogite-facies metamorphism (Figure 1) that results in the insignificant release of aqueous solutions (Xia et al 2010). The chondrite element values are after Sun and McDonough (1989).…”

Section: Crust-mantle Interaction In Subduction Channelmentioning

confidence: 99%

“…The phase separation of supercritical fluids has been directly observed in sophisticated in situ laboratory experiments (Kawamoto et al 2012). Field-based studies suggested that some multiphase solid inclusions (MSI) may be crystallized from the separated hydrous melts (Ferrando et al 2005;Frezzotti et al 2007;Gao et al 2012), whereas metamorphic zircon and rutile in metamorphic veins inside UHP eclogites may be grown from the separated aqueous solutions (Xia et al 2010;Zheng et al 2011b). …”

Section: Water In Subduction-zone Rocksmentioning

confidence: 99%

“…These observations suggest that metamorphic fluids can transport Ti at eclogite-facies conditions at least over short distances of a few meters. Combined with the generally low solubility of Ti in aqueous solutions (Figure 2), this indicates that dissolutionreprecipitation reactions must be involved in order to dissolve and transport the HFSE from host eclogites for rutile-bearing veining (Xia et al 2010;Zheng et al 2011a). While it is difficult to extract information about element solubilities from metamorphic and anatectic veins, important conclusions about trace element fractionation can be obtained from accessory minerals.…”

Section: Action Of Subduction-zone Fluids Accessary Mineral Records Omentioning

confidence: 99%

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Geochemistry of continental subduction-zone fluids

2014

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The composition of continental subduction-zone fluids varies dramatically from dilute aqueous solutions at subsolidus conditions to hydrous silicate melts at supersolidus conditions, with variable concentrations of fluid-mobile incompatible trace elements. At ultrahigh-pressure (UHP) metamorphic conditions, supercritical fluids may occur with variable compositions. The water component of these fluids primarily derives from structural hydroxyl and molecular water in hydrous and nominally anhydrous minerals at UHP conditions. While the breakdown of hydrous minerals is the predominant water source for fluid activity in the subduction factory, water released from nominally anhydrous minerals provides an additional water source. These different sources of water may accumulate to induce partial melting of UHP metamorphic rocks on and above their wet solidii. Silica is the dominant solute in the deep fluids, followed by aluminum and alkalis. Trace element abundances are low in metamorphic fluids at subsolidus conditions, but become significantly elevated in anatectic melts at supersolidus conditions. The compositions of dissolved and residual minerals are a function of pressure-temperature and whole-rock composition, which exert a strong control on the trace element signature of liberated fluids. The trace element patterns of migmatic leucosomes in UHP rocks and multiphase solid inclusions in UHP minerals exhibit strong enrichment of large ion lithophile elements (LILE) and moderate enrichment of light rare earth elements (LREE) but depletion of high field strength elements (HFSE) and heavy rare earth elements (HREE), demonstrating their crystallization from anatectic melts of crustal protoliths. Interaction of the anatectic melts with the mantle wedge peridotite leads to modal metasomatism with the generation of new mineral phases as well as cryptic metasomatism that is only manifested by the enrichment of fluid-mobile incompatible trace elements in orogenic peridotites. Partial melting of the metasomatic mantle domains gives rise to a variety of mafic igneous rocks in collisional orogens and their adjacent active continental margins. The study of such metasomatic processes and products is of great importance to understanding of the mass transfer at the slab-mantle interface in subduction channels. Therefore, the property and behavior of subduction-zone fluids are a key for understanding of the crust-mantle interaction at convergent plate margins.

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Section: Action Of Subduction-zone Fluids Accessary Mineral Records Omentioning

confidence: 99%

Section: Crust-mantle Interaction In Subduction Channelmentioning

confidence: 99%

Section: Water In Subduction-zone Rocksmentioning

confidence: 99%

Section: Action Of Subduction-zone Fluids Accessary Mineral Records Omentioning

confidence: 99%

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Geochemistry of continental subduction-zone fluids

2014

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“…On one hand, zircon can grow by metamorphic reactions of protolith minerals under subsolidus conditions (Fraser et al, 1997;Pan, 1997;Bingen et al, 2001;Degeling et al, 2001), or crystallize from aqueous fluids (e.g., Liati and Gebauer, 1999;Rubatto and Hermann, 2003;Zheng et al, 2007a;Wu et al, 2009a;Xia et al, 2009;Chen et al, 2010) or hydrous melts (Vavra et al, 1996;Roberts and Finger, 1997;Keay et al, 2001;Rubatto, 2002;Rubatto et al, 2009;Xia et al, 2009;Liu et al, 2010). On the other hand, protolith zircons can be modified by metamorphic recrystallization to approach different extents of thermodynamic reequilibration, depending on the crystallinity of the zircons and their accessibility to metamorphic fluid/melt (e.g., Geisler et al, 2007;Rubatto and Hermann, 2007;Martin et al, 2008;Rubatto et al, 2008;Xia et al, 2009;Chen et al, 2010;Xia et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Metamorphic growth and recrystallization of zircons in extremely 18O-depleted rocks during eclogite-facies metamorphism: Evidence from U–Pb ages, trace elements, and O–Hf isotopes

Chen

Zheng

Chen

et al. 2011

Geochimica et Cosmochimica Acta

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118

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The crust‐mantle interaction in continental subduction channels: Zircon evidence from orogenic peridotite in the Sulu orogen

Chen

Zheng

et al. 2016

JGR Solid Earth

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A combined secondary ion mass spectrometer and laser ablation‐(multicollector)‐inductively coupled plasma mass spectrometer study of zircon U‐Pb ages, trace elements, and O and Hf isotopes was carried out for orogenic peridotite and its host gneiss in the Sulu orogen. Newly grown zircon domains exhibit weak zoning or no zoning, relatively low Th/U ratios (<0.1), low heavy rare earth element (HREE) contents, steep middle rare earth element‐HREE patterns, negative Eu anomalies, and negative to low δ18O values of −11.3 to 0.9‰ and U‐Pb ages of 220 ± 2 to 231 ± 4 Ma. Thus, these zircons would have grown from metasomatic fluids during the early exhumation of deeply subducted continental crust. The infiltration of metasomatic fluids into the peridotite is also indicated by the occurrence of hydrous minerals such as amphibole, serpentine, and chlorite. In contrast, relict zircon domains exhibit magmatic zircon characteristics. Their U‐Pb ages and trace element and Hf‐O isotope compositions are similar to those for protolith zircons from ultrahigh‐pressure metamorphic rocks in the Dabie‐Sulu orogenic belt. Thus, these relict magmatic zircons would be physically transported into the peridotite by metasomatic fluids originated from the deeply subducted continental crust. Therefore, the peridotite underwent metasomatism by aqueous solutions derived from dehydration of the deeply subducted continental crust during the early exhumation. It is these crustally derived fluids that would have brought not only such chemical components as Zr and Si but also tiny zircon grains from the deeply subducted crustal rocks into the peridotite at the slab‐mantle interface in continental subduction channels. As such, the orogenic peridotite records the crust‐mantle interaction at the deep continental subduction zone.

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Trace elements in zircon and coexisting minerals from low-T/UHP metagranite in the Dabie orogen: Implications for action of supercritical fluid during continental subduction-zone metamorphism

Cited by 126 publications

References 140 publications

Geochemistry of continental subduction-zone fluids

Geochemistry of continental subduction-zone fluids

Metamorphic growth and recrystallization of zircons in extremely 18O-depleted rocks during eclogite-facies metamorphism: Evidence from U–Pb ages, trace elements, and O–Hf isotopes

The crust‐mantle interaction in continental subduction channels: Zircon evidence from orogenic peridotite in the Sulu orogen

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