Zirconological tracing of transition between aqueous fluid and hydrous melt in the crust: Constraints from pegmatite vein and host gneiss in the Sulu orogen

Li, Wan-Cai; Chen, Ren‐Xu; Zheng, Yong‐Fei; Li, Qiuli; Hu, Zhaochu

doi:10.1016/j.lithos.2013.01.004

Cited by 40 publications

(22 citation statements)

References 110 publications

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“…The three types of fluids have also been recognized in continental subduction zones [e.g., Ferrando et al , ; Zhang et al , ; Xia et al , ; Zheng et al , , and references therein]. Zircon domains that grew from these different types of fluids can be distinguished by their CL images, trace elements, and inclusions [e.g., Xia et al , , ; Chen et al , , ; Li et al , ; Liu et al , ; Zheng and Hermann , ]. The metasomatic zircons in the Tengjia Peridotites exhibit Ti‐in‐zircon temperatures mostly lower than 650°C.…”

Section: Discussionmentioning

confidence: 99%

“…As discussed in the previous section, it is unlikely that these relict zircons were incorporated into the peridotites either before or after the continental deep subduction in the Triassic. Previous studies have demonstrated that the fluid/melt released from the deeply subducted continental crust not only results in the new growth of Triassic zircons but also the recrystallization of the relict magmatic zircons and their pertinent O and U‐Pb isotope systems [e.g., Chen et al , , ; Sheng et al , ; Li et al , , ]. Quartz veins and leucosomes within UHP metamorphic rocks, which directly record the flow of aqueous solutions and hydrous melts during the exhumation of deeply subducted continental crust, contain both the Triassic‐grown zircon and relict magmatic zircons [e.g., Zong et al , ; Chen et al , ; Sheng et al , ; Xu et al , ], and the relict magmatic zircons and the newly growth zircons show similar Hf‐O correlation to those in the UHP metamorphic rocks [ Sheng et al , ].…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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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“…), suggesting that they are of metamorphic origin. However, they have higher U contents, more negative Eu anomalies, and steeper REE patterns than the relict magmatic domains, differing from common metamorphic zircon grown from aqueous solutions (Li et al ., , ). Petrographic observations of the samples show the occurrence of highly cuspate plagioclase grains at grain boundaries and microscale felsic veins at grain boundaries or across feldspar (Fig.…”

Section: Discussionmentioning

confidence: 99%

Polygenetic titanite records the composition of metamorphic fluids during the exhumation of ultrahigh‐pressure metagranite in the Sulu orogen

Chen

Zhou

Zheng

et al. 2016

Journal Metamorphic Geology

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An integrated study of U-Pb ages and trace elements was carried out for titanite and zircon from ultrahigh-pressure (UHP) metagranites in the Sulu orogen, east-central China. The results provide constraints on the composition of metamorphic fluids during the exhumation of deeply subducted continental crust. Titanite has two domain types based on REE patterns and trace element variations, Ttn-I and Ttn-II respectively. These two domains show indistinguishable U-Pb ages of 232 AE 14 to 220 AE 8 Ma, in general agreement with anatectic zircon U-Pb ages of 223 AE 4 to 219 AE 2 Ma for the partial melting event during early exhumation. The Ttn-I domains have significantly higher REE, Th, Ta and Sr, and higher Th/U ratios than the Ttn-II domains, indicating that the two domains have grown from metamorphic fluids with different compositions. For the Ttn-I domains, Zr-in-titanite thermometry yields high temperatures of 773-851°C at 2.5 GPa, and petrographic observations reveal the presence of melt pseudomorphs. Thus, they are interpreted to have grown from hydrous melts in the early exhumation stage. In contrast, the Ttn-II domains were texturally equilibrated with amphibolite facies minerals such as biotite and plagioclase and contain inclusions of plagioclase and quartz. The Zr-in-titanite thermometry yields lower temperatures of 627-685°C at 1.0 GPa. In combination with their REE patterns, they are interpreted to have grown from aqueous solutions at amphibolite facies metamorphic conditions during further exhumation. The differences in Th and Sr contents are prominent between the Ttn-I and Ttn-II domains, signifying the compositional difference between the hydrous melts and aqueous solutions. Therefore, the polygenetic titanite in the UHP metamorphic rocks provides insights into the geochemical property of metamorphic fluids during the continental subduction-zone processes.

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“…Because these exhumation related partial melts are not likely to have separated from their parent rocks, they can be classified as anatectic (e.g. Li et al, 2013;Zheng and Hermann, 2014) in origin and may be similar to those that formed during the post-collision stage of the Dabie-Sulu (U)HP terrane (e.g., Chen et al, 2012Chen et al, , 2013aChen et al, , 2013bChen et al, , 2015Li et al, 2013Li et al, , 2014. The Hf isotope results from the zircons in this sample can therefore be related to the behavior of the Lu-Hf system during the exhumation phase of the (U)HP complex.…”

Section: Discussionmentioning

confidence: 99%

Cathodoluminescence guided zircon Hf isotope depth profiling: Mobilization of the Lu–Hf system during (U)HP rock exhumation in the Woodlark Rift, Papua New Guinea

Zirakparvar

2015

Lithos

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Zirconological tracing of transition between aqueous fluid and hydrous melt in the crust: Constraints from pegmatite vein and host gneiss in the Sulu orogen

Cited by 40 publications

References 110 publications

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

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

Polygenetic titanite records the composition of metamorphic fluids during the exhumation of ultrahigh‐pressure metagranite in the Sulu orogen

Cathodoluminescence guided zircon Hf isotope depth profiling: Mobilization of the Lu–Hf system during (U)HP rock exhumation in the Woodlark Rift, Papua New Guinea

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