Age and geochemistry of contrasting peridotite types in the Dabie UHP belt, eastern China: Petrogenetic and geodynamic implications

Zheng, Jian Ping; Sun, Min; Griffin, William L.; Zhou, Mei‐Fu; Zhao, Guochun; Robinson, Paul T.; Tang, Huayun; Zhang, Z.H.

doi:10.1016/j.chemgeo.2007.10.023

Cited by 75 publications

(82 citation statements)

References 88 publications

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“…Nevertheless, metamorphic veins and migmatic leucosomes within UHP rocks can be used to retrieve information about the composition of deep fluids. Advanced micro-analytical methods are applied to acquire the geochemical composition of metamorphic and anatectic veins in UHP metamorphic terranes (Zheng et al 2008;Chen et al, 2012aChen et al, , 2012bGuo et al 2012;Yu et al 2012;Song et al 2014). This leads to a better understanding of the role of fluids for mass transfer at the slab-mantle interface in subduction channels.…”

Section: Natural Constraintsmentioning

confidence: 99%

“…The difference in the composition of magmatic rocks is attributed to different extents of melt-peridotite reaction at the slab-mantle interface, where there is a jelly-sandwich structure in which a weak layer composed of metamorphic, anatectic and metasomatic rocks (the jelly) is sandwiched between the overlying mantle wedge and the underlying subducted crustal slab ). Song et al 2005;Zhang et al 2005Zhang et al , 2011Hermann et al 2006b;Zheng et al 2006Zheng et al , 2008Liati and Gebauer 2009;Xiong et al 2011b). This indicates that both the chemical transport of dissolved Zr and the physical transport of crustal zircon xenocrysts by either metamorphic fluids or anatectic melts have taken place at the slabmantle interface in subduction channels (Zheng 2012).…”

Section: Crust-mantle Interaction In Subduction Channelmentioning

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: Natural Constraintsmentioning

confidence: 99%

Section: Crust-mantle Interaction In Subduction Channelmentioning

confidence: 99%

Geochemistry of continental subduction-zone fluids

2014

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“…When zircon does occur in mantle peridotite, it commonly reflects metasomatism (i.e., Zheng et al 2003a) by fluids/melts derived either from the asthenosphere Zheng et al 2006a) or from the dehydration of subducting lithosphere (Katayama et al 2003;Smith and Griffin 2005;Liou et al 2007;Zhao et al 2008). The U-Pb and Hf isotope systematics and the trace element compositions of zircon in ultramafic rocks therefore can provide new insights into the nature and effects of mantle-crust chemical exchange, as well as the geodynamic evolution of the lithospheric parts of deep subduction zones (Zheng et al , 2008aChen et al 2007;Zhang et al 2008).…”

Section: Introductionmentioning

confidence: 98%

“…One example is the peridotites from the Bixiling complex (Fig. 1a) in the Dabie UHP belt (Zhang et al 1995), which represent the cumulation of a Neoproterozoic (*750 Ma) magma chamber in the continental crust, later carried to garnetstable depths during the Triassic subduction of the Yangtze craton (Zheng et al 2008a). Another example is the garnet peridotites sampled by the main hole of the Chinese Continental Science Drilling Project (CCSD-MH) in the Sulu belt, which contain olivine with Mg # = 0.82-0.86 Yang et al 2007).…”

Section: Introductionmentioning

confidence: 98%

“…1a; Zheng et al 2008a), have high-Mg # olivine; they were initially derived from the upper lithospheric mantle (or mantle wedge; Brueckner 1998) above the subducting slab. At least some of them (i.e., the Zhimafang peridotites) have experienced high-pressure (HP) or UHP metamorphism during the collision of the North China and Yangtze cratons.…”

Section: Introductionmentioning

confidence: 99%

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Linking continental deep subduction with destruction of a cratonic margin: strongly reworked North China SCLM intruded in the Triassic Sulu UHP belt

Zheng

Tang

Xiong

et al. 2014

Contrib Mineral Petrol

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The collision between the North and South China cratons in Middle Triassic time (240-225 Ma) created the world's largest belt of ultrahigh-pressure (UHP) metamorphism. U-Pb ages, Hf isotope systematics and trace element compositions of zircons from the Xugou, Yangkou and Hujialing peridotites in the Sulu UHP terrane mainly record a *470 Ma tectonothermal event, coeval with the Early Paleozoic kimberlite eruptions within the North China craton. This event is interpreted as the result of metasomatism by fluids/melts derived from multiple sources including a subducting continental slab. The peridotites also contain zircons with ages of *3.

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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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Age and geochemistry of contrasting peridotite types in the Dabie UHP belt, eastern China: Petrogenetic and geodynamic implications

Cited by 75 publications

References 88 publications

Geochemistry of continental subduction-zone fluids

Geochemistry of continental subduction-zone fluids

Linking continental deep subduction with destruction of a cratonic margin: strongly reworked North China SCLM intruded in the Triassic Sulu UHP belt

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

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