Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Huang, Hongyan; Niu, Yaoling; Mo, Xuanxue

doi:10.1016/j.lithos.2016.12.025

Cited by 35 publications

(9 citation statements)

References 54 publications

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“…Five syn-collisional plutons from the NQOB have been recognized; they are, from southeast to northwest, the Qumushan (QMS) pluton (Chen et al, 2016), the Baojishan (BJS) pluton (Chen et al, 2015), the Machangshan (MCS) pluton, the Laohushan (LHS) pluton (Qian et al, 1998), and the Jinfosi (JFS) pluton (Wu et al, 2010;Huang et al, 2017) (Supplementary Table S1 and Fig. 1).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Syn-collisional felsic magmatism and continental crust growth: A case study from the North Qilian Orogenic Belt at the northern margin of the Tibetan Plateau

Chen

Niu

Xue

2018

Lithos

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Section: Accepted Manuscriptmentioning

confidence: 99%

Syn-collisional felsic magmatism and continental crust growth: A case study from the North Qilian Orogenic Belt at the northern margin of the Tibetan Plateau

Chen

Niu

Xue

2018

Lithos

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“…However, the εHf(t) values of the Xiwanggou are all positive between MORB and CHUR (Figure 6), which probably indicates a simple depleted mantle source with very slight mix. Apparently, the bulk-rock Nd and zircon Hf isotopes are decoupled in the Xiwanggou complex, in which the discrepancy between the extremely depleted Hf isotopes of zircons and the slight enriched Nd isotopes of bulk rocks demonstrate that zircons do not always capture the full history of magmatic system (Huang et al, 2019). In addition, the participation of amphibole and garnet in the melt producing processes maybe result in isotopic discrepancy between zircon and bulk-rocks (Huang et al, 2017(Huang et al, , 2019.…”

Section: Sr-nd Isotopesmentioning

confidence: 99%

“…Therefore, the favored interpretation may be that the Late Permian basalts was primarily yielded by the dehydration partial melting of amphibole above a subduction zone, and some melts would have directly arisen to a surficial depth along deep faults, e.g., Xiwanggou fertile complex; but some metasomatized melts would be detained at lower crust depth and further produced relatively siliceous magma due to fractional crystallization of Grt and Cpx, e.g., Bairiqili barren diabase-gabbros (Figure 12). The garnet-bearing residues after melt extraction were then transformed into juvenile lower crust materials, and evolved with time to produce high εHf(t) at a low εNd(t) value with elevation of Lu/Hf ratios (Huang et al, 2019).…”

Section: Sr-nd Isotopesmentioning

confidence: 99%

Geodynamic Setting and Cu-Ni Potential of Late Permian Xiwanggou Mafic-Ultramafic Rocks, East Kunlun Orogenic Belt, NW China

Zhang

Wang

et al. 2021

Front. Earth Sci.

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Several magmatic Cu–Ni sulfide deposits have recently been explored along the deep Middle Kunlun fault related to the extension of the East Kunlun orogenic belt in Qinghai Province, NW China. The Xiwanggou mafic–ultramafic rocks associated with Cu–Ni sulfide mineralization are first to be dated as late Permian compared to most of the deposits formed during late Silurian–early Devonian in this region. The Xiwanggou complexes located in the junction area between the East Kunlun and West Qinling belts, are composed of gabbros, olivine-gabbros, pyroxenites, olivine-pyroxenites, and peridotites. The Cu–Ni mineralization are mainly hosted in the olivine-pyroxenites and pyroxenites, whereas the sulfide-poor mineralization distributed in gabbros and olivine-gabbros. Zircon LA-ICP-MS U–Pb dating of the gabbro and olivine-pyroxenite revealed their crystallized ages of 250.8 ± 0.8 Ma and 257.3 ± 0.7 Ma, respectively. The trace element characteristics of the Xiwanggou fertile mafic-ultramafic rocks shows the enrichments in Sr, Rb, Th, Ba and light rare earth elements, and depletions in Nb and Ta, which are associated with the slab derived fluid input and dehydration melting of amphiboles. Meanwhile, Sr–Nd and Hf isotopic compositions of the gabbro [εNd(t) = 0.66–1.18; εHf(t) = 5.2–12] and olivine-pyroxenite [εNd(t) = −1.09 – −0.43; εHf(t) = 5.4–17.7] show that the magma was mainly derived from the metasomatized portions of subcontinental lithospheric mantle (SCLM) source in the mantle wedge. The magma primarily experienced dehydration melting processes of amphiboles and subsequently underwent hydrated melting in the overlying mantle wedge and relatively reduced background. The cool subduction process of the Anemaqen oceanic lithosphere maybe trigger large melting in the mantle wedge resulting in a relative low-Ni content in the melt. The transpressional windows formed by the right-lateral strike-slip shearing action of the Wenquan and South Kunlun faults in the South Kunlun forearc belt created a significant conduit for the magma ascending. The thermometer of Fe and Ni exchange between coexisting olivine and sulfide melt indicates the magma were yielded in a temperature range of ca. 1200–1300°C and an oxygen fugacity range of ca. –10.57 to –8.98 (log unit), which suggested that the parental magma of the Xiwanggou complex derived from a relatively reduced source favoring Ni relative to Fe in the melt. The intermediate sulfide segregation from the melt resulted in a medium tenor potential for the Xiwanggou complex.

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“…Studies on the petrogenesis of syn-collisional granitoids are important for testing this hypothesis. Our studies on syn-J o u r n a l o f P e t r o l o g y a c c e p t e d m a n u s c r i p t ( 2 0 2 0 0 3 0 5 ) collisional granitoids with mafic magmatic enclaves (MMEs) from orogens on the Tibetan Plateau and adjacent regions (e.g., Qinling, Kunlun and Qilian orogens) support this hypothesis in many aspects, including significant mantle Nd-Hf isotopic contributions to the granitoids (Huang et al, 2014(Huang et al, , 2015(Huang et al, , 2016(Huang et al, , 2017Chen et al, 2015Chen et al, , 2016Chen et al, , 2018Li et al, 2016Li et al, , 2017Duan et al, 2016;Zhang et al, 2016;Kong et al, 2017). Nevertheless, quantification is necessary in order to develop this testable hypothesis into a comprehensive theory.…”

Section: Introductionmentioning

confidence: 99%

Mineral Compositions of Syn-collisional Granitoids and their Implications for the Formation of Juvenile Continental Crust and Adakitic Magmatism

Xiao

Chen

Niu

et al. 2020

Journal of Petrology

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Continentalcollision zones have been proposed as primary sites of net continental crustal growth. Therefore, studies on syn-collisional granitoids with mafic magmatic enclaves (MMEs) are essential for testing this hypothesis. The Baojishan (BJS) and Qumushan (QMS) syn-collisional plutons in the North Qilian Orogen (NQO) on the northern margin of the Tibetan Plateau have abundant MMEs in sharp contact with host granitoids, sharing similar constituent minerals but with higher modal abundances of mafic minerals in MMEs. The QMS host granitoids have high Sr/Y and La/Yb ratios, showing adakitic compositions, which are differentfrom the BJS granitoids. Based on bulk-rock compositions and zircon U-Pb age-dating, recent studies on these two plutons proposed that MMEs represent cumulates crystallized early from the same magmatic system as their host granitoids, and their parental melts are best understood as andesitic magmas produced by partial melting of the underthrusting upper ocean crust upon collision with some terrigenous sediments under amphibolite facies. Here, we focus on the trace-element geochemistry of the constituent mineral phases of both MMEs and their host granitoids of the QMS and BJS plutons. Weshow that different mineral phases preferentially host different trace elements; for example, most rare earth elements (REEs and Y) reside in titanite (only found in the QMS pluton), amphibole, apatite, epidote and zircon (mostly heavy-REEs); and high-field-strength elements (HFSEs) reside in biotite, titanite, amphibole and zircon. Based on the mineral chemical data, we show that for these two plutons, MMEs are of similar cumulate origin, crystallized from primitive andesitic melts in the early stage of granitoid magmatism. The primitive andesitic melts for these syn-collisional granitoids are most likely produced by the partial melting of the oceanic crust, supporting the hypothesis of continental crustal growth considering the syn-collisional granitoids represent juvenile continental crust. As evidenced by distinct mineral compositions, the two plutons have different parental magma compositions, for example higher TiO2 content and higher Sr/Y and La/Yb ratios in the QMS parental magmas, a signature best understood as being inherited from the source. The higher TiO2 content of the parental magma for the QMS pluton leads to the common presence of titanite in the QMS pluton (absent in the BJS pluton), crystallization of which in turn controls the trace-element (REE, Y, Nb, Ta and others) systematics in the residual melts towards an adakitic signature. Therefore, parental magmas with high TiO2 content and high Sr/Y and La/Yb ratios, as well as their further fractionation of titanite, are important factors in the development of adakitic compositions, as represented by the QMS host granitoids. This model offers a new perspective on the petrogenesis of adakitic rocks. The present study further demonstrates that, in general, mineral chemistry holds essential information for revealing the petrogenesis of granitoid rocks.

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Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Cited by 35 publications

References 54 publications

Syn-collisional felsic magmatism and continental crust growth: A case study from the North Qilian Orogenic Belt at the northern margin of the Tibetan Plateau

Syn-collisional felsic magmatism and continental crust growth: A case study from the North Qilian Orogenic Belt at the northern margin of the Tibetan Plateau

Geodynamic Setting and Cu-Ni Potential of Late Permian Xiwanggou Mafic-Ultramafic Rocks, East Kunlun Orogenic Belt, NW China

Mineral Compositions of Syn-collisional Granitoids and their Implications for the Formation of Juvenile Continental Crust and Adakitic Magmatism

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