Melting of subducted continental crust: Geochemical evidence from Mesozoic granitoids in the Dabie-Sulu orogenic belt, east-central China

Zhao, Zi‐Fu; Liu, Zhibin; Chen, Qi

doi:10.1016/j.jseaes.2017.03.038

Cited by 100 publications

(58 citation statements)

References 157 publications

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“…In comparison, the second two episodes are likely to be associated with lithospheric extension (Liu, Robinson, et al, ; Liu, Robinson, & Liu, ), most likely as a thermal response to the thinning of a collision‐thickened region of the orogenic lithosphere (Zheng & Chen, ). The northeastern Sulu orogen contains widespread Jurassic granitoids that yield ages of 141–174 Ma (Jiang et al, ; Zhang et al, ; Zhao, Liu, et al, ; Zhao & Zheng, ), providing further evidence of a tectonothermal anomaly during this period.…”

Section: Implications For the Tectonic Evolution Of The Dabie–sulu Ormentioning

confidence: 99%

“…Although the Sulu orogen is generally considered to be the northeastern extension of the Dabie orogen, the Sulu UHP rocks (especially the migmatites analysed during this study) record a different post‐collisional evolutionary history than the Dabie UHP rocks. This is exemplified by the Jurassic anatexis being prominent within the Sulu orogen but absent in the Dabie orogen (Zhao, Liu, et al, ). Episodes of crustal anatexis in the Dabie orogen occurred at 220–190 and 143–124 Ma (Chen, Ding, et al, ; Wu et al, ; Zhao, Liu, et al, ), but no evidence has been found for a Jurassic anatectic event within the migmatites in this orogen.…”

Section: Implications For the Tectonic Evolution Of The Dabie–sulu Ormentioning

confidence: 99%

“…This is exemplified by the Jurassic anatexis being prominent within the Sulu orogen but absent in the Dabie orogen (Zhao, Liu, et al, ). Episodes of crustal anatexis in the Dabie orogen occurred at 220–190 and 143–124 Ma (Chen, Ding, et al, ; Wu et al, ; Zhao, Liu, et al, ), but no evidence has been found for a Jurassic anatectic event within the migmatites in this orogen. However, retrograde HP granulite facies metamorphism at c. 215 Ma is recorded within UHP eclogite facies rocks in the Dabie orogen, with a further possible amphibolite facies overprinting event also occurring at 215–180 Ma (e.g.…”

Section: Implications For the Tectonic Evolution Of The Dabie–sulu Ormentioning

confidence: 99%

“…The Dabie and Sulu orogens formed part of a coherent orogenic belt during the late Triassic (Zheng et al, , ). However, the Late Triassic partial melting of UHP metamorphic rocks is much more widespread in the Sulu orogen than in the Dabie orogen (Zhao, Liu, et al, ; Zhao, Zheng, et al, ). This difference may reflect variations in the amount of fluid released by mineral dehydration during the Late Triassic exhumation of UHP slices between the Sulu and Dabie orogens, indicating that the deeply subducted continental crust in the Sulu orogen was more efficiently dehydrated and provided more fluids that caused more significant partial melting than was the case in the Dabie orogen.…”

Section: Implications For the Tectonic Evolution Of The Dabie–sulu Ormentioning

confidence: 99%

“…Castro, 2013;Clemens, 2006;Gao et al, 2016). The melting of granitic gneisses is an important part of the differentiation of continental crust (Carvalho, Sawyer, & Janasi, 2016;Sawyer, 2010;Slagstad, Jamieson, & Culshaw, 2005;Zhao, Liu, & Chen, 2017). As such, it is important to understand the behaviour of elements during this partial melting process.…”

Section: Geochemical Differentiation During the Partial Melting Of mentioning

confidence: 99%

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Migmatites record multiple episodes of crustal anatexis and geochemical differentiation in the Sulu ultrahigh‐pressure metamorphic zone, eastern China

Zhou

Chen

Zheng

et al. 2019

Journal Metamorphic Geology

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Partial melting of ultrahigh‐pressure (UHP) metamorphic rocks is common during collisional orogenesis and post‐collisional reworking, indicating that determining the timing and processes involved in this partial melting can provide insights into the tectonic evolution of collisional orogens. This study presents the results of a combined whole‐rock geochemical and zirconological study of migmatites from the Sulu orogen in eastern China. These data provide evidence of multiple episodes of crustal anatexis and geochemical differentiation within the UHP metamorphic rocks. The leucosomes contain higher concentrations of Ba and K and lower concentrations of the rare earth elements (REE), Th and Y, than associated melanosomes and granitic gneisses. The leucosomes also have homogenous Sr–Nd–O isotopic compositions that are similar to proximal (i.e. within the same outcrop) melanosomes, suggesting that the anatectic melts were generated by the partial melting of source rocks that are located within individual outcrops. The migmatites contain zircons with six different types of domains that can be categorized using differences in structures, trace element compositions, and U–Pb ages. Group I domains are relict magmatic zircons that yield middle Neoproterozoic U–Pb ages and contain high REE concentrations. Group II domains represent newly grown metamorphic zircons that formed at 230 ± 1 Ma during the collisional orogenesis. Groups III, IV, V, and VI zircons are newly grown anatectic zircons that formed at 222 ± 2 Ma, 215 ± 1 Ma, 177 ± 2 Ma, and 152 ± 2 Ma, respectively. The metamorphic zircons have higher Th/U and lower (Yb/Gd)N values, flat heavy REE (HREE) patterns with no significantly negative Eu anomalies relative to the anatectic zircons, which are characterized by low Th/U ratios, steep HREE patterns, and negative Eu anomalies. The first two episodes of crustal anatexis occurred during the Late Triassic at c. 222 Ma and c. 215 Ma as a result of phengite breakdown. The other two episodes of anatexis occurred during the Jurassic period at c. 177 Ma and c. 152 Ma and were associated with extensional collapse of the collision‐thickened orogen. The majority of Triassic anatectic zircons and all of the Jurassic zircons are located within the leucosomes, whereas the melanosomes are dominated by Triassic metamorphic zircons, suggesting that the leucosomes within the migmatites record more episodes of crustal anatexis. Both metamorphic and anatectic zircons have elevated εHf(t) values compared with relict magmatic zircon cores, suggesting that these zircons contain non‐zircon Hf derived from material with more radiogenic Hf isotope compositions. Therefore, the Sulu and Dabie orogens experienced different episodes of reworking during the exhumation and post‐collisional stages.

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Section: Implications For the Tectonic Evolution Of The Dabie–sulu Ormentioning

confidence: 99%

Section: Implications For the Tectonic Evolution Of The Dabie–sulu Ormentioning

confidence: 99%

Section: Implications For the Tectonic Evolution Of The Dabie–sulu Ormentioning

confidence: 99%

Section: Implications For the Tectonic Evolution Of The Dabie–sulu Ormentioning

confidence: 99%

Section: Geochemical Differentiation During the Partial Melting Of mentioning

confidence: 99%

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Migmatites record multiple episodes of crustal anatexis and geochemical differentiation in the Sulu ultrahigh‐pressure metamorphic zone, eastern China

Zhou

Chen

Zheng

et al. 2019

Journal Metamorphic Geology

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Crustal Metasomatism at the Slab‐Mantle Interface in a Continental Subduction Channel: Geochemical Evidence From Orogenic Peridotite in the Sulu Orogen

Chen

Zheng

et al. 2018

JGR Solid Earth

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To understand crust‐mantle interactions in a continental subduction channel, we carried out a combined study of whole‐rock elements and Sr‐Nd isotopes, mineral elements, and whole‐rock and mineral O isotopes in orogenic peridotite and its host gneiss from the Sulu orogen in China. The results indicate that the peridotite originated from highly depleted subcontinental lithospheric mantle beneath the North China Craton and underwent three episodes of metasomatism via crustally derived fluids. The peridotite was offscraped from the subcontinental lithospheric mantle wedge base and experienced petrographic transformation from a spinel peridotite to a garnet peridotite during continental subduction from forearc to subarc depths. The peridotite underwent the first episode of metasomatism via aqueous solutions at high‐pressure conditions. Afterward, the peridotite underwent a second episode of metasomatism by carbonate melts at ultrahigh‐pressure conditions and a third episode of metasomatism by aqueous solutions at high‐pressure conditions. While the aqueous solution was derived from the metamorphic dehydration of the subducting/exhuming continental crust at the forearc depths, the carbonate melts were produced by partial melting of the ultrahigh‐pressure metasedimentary rocks in the exhuming continental crust at subarc depths. These metasomatic agents did not originate from the gneiss directly hosting the peridotite but from another part of the deeply subducted continental crust that was not in direct contact with the peridotite. Therefore, the orogenic peridotite recorded the geochemical transfer from the subducting crust into the mantle in the continental subduction zone.

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Petrogenesis of Cretaceous granites in the southern Sulu Orogen: Implications for the flare‐up of post‐collisional magmatism

et al. 2020

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To well understand the dynamic mechanism of Cretaceous magmatism flare-up in the southern Sulu Orogen (SSO), the ages and petrogenesis of Qingyun monzogranites and the other coeval granitic plutons in the SSO are investigated herein through an integrated study of petrology, geochemistry, geochronology, and Sr-Nd-Pb-Hf isotopes. The studied granites are characterized by high Si, weak peraluminous, poor Fe and Mg, rich alkaline and high K. They are also characterized by enriched light rare earth element (LREE) and depleted heavy rare earth element (HREE), with the strong fractionation between LREE and HREE [(La/Yb) N = 19.71-45.78]. Besides, the rocks are depleted in HFSEs (i.e., Ta, Nb, Ti, and P) and relatively enriched in Pb and LILEs (i.e., Rb, Th, and K), with moderate negative Eu anomalies (δEu = 0.62-0.72). The lithogeochemical characteristics indicate that they are highly differentiated I-type granite. Zircon U-Pb dating shows the age of monzogranite is 126.7 ± 1.0 Ma, which formed by magmatism in the Early Cretaceous. In addition, all the samples have low (206 Pb/ 204 Pb) i , (207 Pb/ 204 Pb) i , and (208 Pb/ 204 Pb) i (15.927-16.173, 15.356-15.383, and 37.084-37.412, respectively), similar to coeval felsic and mafic rocks from the Sulu Orogen and the North China Craton (NCC). Moreover, they display negative εHf(t) values (−21.53 to −34.43) with T DM2 model ages (2.55-3.35 Ga). Both the εHf(t) and T DM2 model ages indicate that they are derived from partial melting of the NCC Neoarchean continental crust. Therefore, it is believed that the rocks are primarily derived from partial melting of lower crust in granulite facies beneath the moderate pressure (0.8-1.3 GPa), corresponding to a depth of 35-45 km, within an extensional tectonic environment. The mineral fractional crystallization could occur in the diagenetic process. The delamination of lithosphere and the underplating of upwelling asthenospheric magma, which are reinforced by the subduction of the Palaeo-Pacific Plate, could be the main factors to lead to partial melting of lower crust.

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Melting of subducted continental crust: Geochemical evidence from Mesozoic granitoids in the Dabie-Sulu orogenic belt, east-central China

Cited by 100 publications

References 157 publications

Migmatites record multiple episodes of crustal anatexis and geochemical differentiation in the Sulu ultrahigh‐pressure metamorphic zone, eastern China

Migmatites record multiple episodes of crustal anatexis and geochemical differentiation in the Sulu ultrahigh‐pressure metamorphic zone, eastern China

Crustal Metasomatism at the Slab‐Mantle Interface in a Continental Subduction Channel: Geochemical Evidence From Orogenic Peridotite in the Sulu Orogen

Petrogenesis of Cretaceous granites in the southern Sulu Orogen: Implications for the flare‐up of post‐collisional magmatism

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