The migration of Tarim plume magma toward the northeast in Early Permian and its significance for the exploration of PGE-Cu–Ni magmatic sulfide deposits in Xinjiang, NW China: As suggested by Sr–Nd–Hf isotopes, sedimentology and geophysical data

Liu, Yuegao; Lü, Xinbiao; Wu, Chun‐Ming; Hu, Xin; Duan, Zhipeng; Deng, Gang; Wang, Heng; Xiang, Zhu; Zeng, Huadong; Wang, Peng; Wang, Wei; Lu, Qiang

doi:10.1016/j.oregeorev.2015.07.020

Cited by 30 publications

(11 citation statements)

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“…The geochemical features of the Atengtao mafic dikes, however, are distinct from those of the OIB‐type rocks (Figure a,b), although the components of the dikes are with an input of asthenospheric material. Moreover, numerous Carboniferous porphyry‐type Cu–Au–Mo and epithermal Au deposits are well‐developed in the western Tianshan (Tang et al, ; Zhai et al, ; Zhang, Zhang, Xue, Zhao, & Liu, ), such as Lailisigaoer and Lamasu–Dabate area as well as Tulasu Basin, demonstrating their formation is different from a mantle plume usually producing Cu–Ni sulfide deposits (Liu et al, ; Y.G. Xu, Wang, Wei, & He, ).…”

Section: Discussionmentioning

confidence: 99%

Early Carboniferous mafic dike–syenitic granite association in the Atengtao Mountain, Yili Block (NW China): Geochronology, petrogenesis, and tectonic significance

Wang

Yang

et al. 2019

Geological Journal

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The Carboniferous is an important period for understanding tectonic evolutionary history and subduction processes of Chinese western Tianshan orogen. Here, we present results of petrologic, geochemical, and in situ LA-ICP-MS zircon U-Pb and Hf isotope data from an Early Carboniferous mafic dike-syenitic granite association in Atengtao Mountain, Yili Block, aiming to constrain their ages and petrogenesis and tectonic significance. Zircon U-Pb dating results reveal that the mafic dikes and syenitic granites were coevally emplaced at ca. 345-349 Ma. Geochemically, the mafic dikes contain high MgO, Nb, TiO 2 , and Ta contents, low SiO 2 contents, and high Na 2 O/K 2 O ratios, showing Nb-enriched affinities. Additionally, they are enriched in LILEs, relatively depleted in HFSEs, and positive εHf (t) values (+1.2 to +8.7), likely representing melts derived from partial melting of a depleted mantle wedge metasomatized by subducted slab-derived fluids, with minor involvement of asthenospheric components. Compared with mafic dikes, the coeval syenitic granites display calc-alkaline I-type features and have high SiO 2 , Al 2 O 3 , and low MgO, Mg # (<40), Ni, and Cr contents, considered to have been derived from the reworking of the Precambrian basementwith an input of mantle-derived components. These mafic dike-syenitic granite associations likely formed in an arc-related setting rather than postcollision or mantle plume setting. In addition, pronouncedly higher zircon saturation temperature of the syenitic granites, compared with the coeval I-type granitoids from western Tianshan, imply the occurrence of a thermal anomaly in this period (ca. 345 Ma). With these studied results, together with previously published data, we argue that a slab breakoff model was likely responsible for the mafic dike-syenitic granite association, and related rocks, in the western Yili Block during Early Carboniferous.

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Section: Discussionmentioning

confidence: 99%

Early Carboniferous mafic dike–syenitic granite association in the Atengtao Mountain, Yili Block (NW China): Geochronology, petrogenesis, and tectonic significance

Wang

Yang

et al. 2019

Geological Journal

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“…The following lines of evidence indicate that the c. 745-710 Ma magmatic rocks in the Kuluketage Block were formed in a continental rift setting, probably related to the underplating of mantle plume-derived magmas: (1) the E-W-trending positive magnetic anomaly belt, located in the central Tarim Basin along latitude 39°4 0 0 , is nearly 30 000 km 2 in the superimposed map of the distribution of the Neoproterozoic rift and aeromagetic anomalies (Liu et al 2016). According to the Bouguer gravity map, the Bachu area is characterized by high value and a northeastern high-gravity belt also observed in the central Tarim Basin (Liu et al 2016). The distribution of the magnetic anomaly and the gravity anomaly in Tarim share the same characteristics, indicating that the two are homologous (M Xu et al 2005).…”

Section: C Tectonic Implicationsmentioning

confidence: 95%

Petrogenesis and tectonic setting of the Dapingliang Late Neoproterozoic magmatic rocks in the eastern Kuluketage Block: geochronological, geochemical and Sr–Nd–Pb–Hf isotopic implications

et al. 2019

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In the past ten years, a great deal of geological study has been reported on the magmatic rocks exposed in the central and western region of the Kuluketage Block, while similar research in the eastern region has rarely been reported. In this paper, we report zircon U–Pb geochronological, zircon Lu–Hf isotopic, whole-rock elemental and Sr–Nd–Pb isotopic data for the Dapingliang intermediate-acid intrusive rocks in the eastern Kuluketage Block, in order to evaluate its petrogenesis and tectonic significance. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U–Pb dating provided a weighted mean 206Pb/238U age of 735 ± 3 Ma for the albitophyre (D1), 717 ± 2 Ma for the granite porphyry (D2) and 721 ± 1 Ma for the diorite porphyrite (D3). Geochemical analyses reveal that D1 and D2 belong to Na-rich alkaline A-type granites, and D3 shows the features of high-K calc-alkaline I-type granite. D1 and D2 are characterized by light rare earth element (LREE) enrichment and relative depletion of high field strength element (HFSE), with relatively flat heavy rare earth element (HREE) patterns and obviously negative Eu anomalies. D3 is characterized by the enrichment of LREE and depletion of HFSE, with negative slope HREE patterns and slightly negative Eu anomalies. In tectonic discrimination diagrams, D1 and D2 fall in the within-plate granite (WPG) field, indicating a rift setting. Although D3 falls within the volcanic arc granite (VAG) field, it most likely formed in a rift setting, as inferred from its petrology, Sr–Nd–Hf isotopes and regional tectonic evolution. Based on pronounced εNd(t), εHf(t), Pb isotopic data, TDM2 and high (87Sr/86Sr)i and elemental compositions, D1 was derived from the partial melting of basement amphibolites of the old lower crust. D2 originated from a mixture of the old lower crust and depleted mantle-derived magmas and was dominated by partial melting of the basement amphibolites of the lower crust. D3 could have been formed by partial melting of K-rich hornblende in the lower crust. Combining previous studies, we think that the c. 745–710 Ma magmatic rocks were formed in a continental rift setting. A partial melting scheme, triggered by underplating of mantle plume-derived magmas, is proposed to interpret the formation of c. 745–710 Ma A-type and I-type granitoids, mantle-derived mafic dykes, bimodal intrusive rocks, adakitic granites and volcanic rocks. These magmatic activities were probably a reflection of the break-up of the Rodinia supercontinent.Highlights(1)Circa 720 Ma magmatism in the eastern Kuluketage Block.(2)Na-rich granite was derived from partial melting of basement amphibolites.(3)The c. 745–710 Ma magmatic rocks were formed in a continental rift setting.(4)The underplating of mantle plume-derived magmas is proposed.

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“…The formation of the ore-bearing mafic-ultramafic intrusions in the CAOB has been suggested to have taken place in several different tectonic settings, including: (1) in association with a mantle plume (Zhou et al 2004;Pirajno et al 2008;Liu et al 2016), (2) Alaskan-type complexes, which form in subduction zones (Han et al 2007;Xiao et al 2009), and (3) a post-collisional extensional environment (Wu et al 2004;Tang et al 2011;Sun et al 2013b, c;Hao et al 2015).…”

Section: Tectonic Setting and Its Evolutionmentioning

confidence: 99%

Petrology, mineral chemistry, and geochemistry of Late Triassic Ni–Cu ore-bearing mafic–ultramafic intrusions, Hongqiling, northeastern China: petrogenesis and tectonic implications

Wang

Song

2019

Can. J. Earth Sci.

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The Hongqiling magmatic Ni–Cu sulfide deposit, situated on the southern margin of the eastern Central Asian Orogenic Belt (CAOB), is composed of over 30 mafic–ultramafic intrusions. These ore-bearing intrusions are composed mainly of harzburgite, lherzolite, websterite, orthopyroxenite, and norite (gabbro). The constituent minerals are olivine, diopside, bronzite, calcic-hornblende, plagioclase, and spinel with orthopyroxene as a dominant mineral in these intrusions. These ore-bearing intrusions are not Alaskan-type complexes. Spinel and clinopyroxene both exhibit different chemical compositions from those in the Alaskan-type complexes. The rocks that make up the intrusions have high contents of MgO (average value = 25.20 wt.%) and low TiO2 (average value = 0.58 wt.%). The high MgO contents of the minerals and the high Mg# (71) of the calculated melt in equilibrium with olivine demonstrate that the parental magma of the Hongqiling mafic–ultramafic intrusions was a high-Mg tholeiitic magma. The Hongqiling ore-bearing mafic–ultramafic intrusions and the calculated “trapped liquids” for the olivine-orthopyroxene cumulate rocks are all enriched in large-ion lithophile elements and depleted in high field strength elements. The Ce/Pb, Ta/La, Th/Yb, and (La/Sm)PM values and the depletion of Nb and Ta suggest that the magma experienced crustal contamination. The Hongqiling ore-bearing intrusions display many similarities with mafic–ultramafic intrusions that formed in a post-collisional extensional environment in the western CAOB (e.g., Huangshanxi). Common features include their whole-rock compositions and mineral chemistry. Combined with the evolutionary history of the eastern segment of the CAOB, we believe that the Late Triassic Hongqiling mafic–ultramafic intrusions formed in a post-collisional extensional environment.

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The migration of Tarim plume magma toward the northeast in Early Permian and its significance for the exploration of PGE-Cu–Ni magmatic sulfide deposits in Xinjiang, NW China: As suggested by Sr–Nd–Hf isotopes, sedimentology and geophysical data

Cited by 30 publications

References 50 publications

Early Carboniferous mafic dike–syenitic granite association in the Atengtao Mountain, Yili Block (NW China): Geochronology, petrogenesis, and tectonic significance

Early Carboniferous mafic dike–syenitic granite association in the Atengtao Mountain, Yili Block (NW China): Geochronology, petrogenesis, and tectonic significance

Petrogenesis and tectonic setting of the Dapingliang Late Neoproterozoic magmatic rocks in the eastern Kuluketage Block: geochronological, geochemical and Sr–Nd–Pb–Hf isotopic implications

Petrology, mineral chemistry, and geochemistry of Late Triassic Ni–Cu ore-bearing mafic–ultramafic intrusions, Hongqiling, northeastern China: petrogenesis and tectonic implications

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