Petrology and geochemistry of late Carboniferous hornblende gabbro from the Awulale Mountains, western Tianshan (NW China): Implication for an arc–nascent back-arc environment

Yan, Shiguang; Shan, Qiang; Niu, He-Cai; Yang, Wu-Bin; Li, Ningbo; Zeng, Ling-Jun; Jiang, Yuhang

doi:10.1016/j.jseaes.2015.01.016

Cited by 33 publications

(13 citation statements)

References 140 publications

(157 reference statements)

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“… ( 87 Sr/ 86 Sr) i versus ɛ Nd (t) diagram showing two‐component mixing and EC‐AFC calculations. The Sr‐Nd isotope data of Tianshan ophiolites (Xu et al, ); late Carboniferous basalts from the Awulale Mountains (Li et al, ; Tang et al, ; Yan et al, ) and South Tianshan early Permian basalts (Huang et al, ; Liu et al, ) are shown for comparision. Tarim Archean and Neoproterozoic basement are from Cao et al ().…”

Section: Resultsmentioning

confidence: 99%

“…Our modeling indicates that small amounts of crustal contamination (<5%) could produce the Sr-Nd isotope variation for most of the lower group samples. ; late Carboniferous basalts from the Awulale Mountains Tang et al, 2014;Yan et al, 2015) and South Tianshan early Permian basalts (Huang et al, 2015;Liu et al, 2014) are shown for comparision. Tarim Archean and Neoproterozoic basement are from Cao et al (2011).…”

Section: Petrogenesis Of the Early Permian Lower Group Calc-alkaline mentioning

confidence: 99%

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Evolving Mantle Sources in Postcollisional Early Permian‐Triassic Magmatic Rocks in the Heart of Tianshan Orogen (Western China)

Tang

Cawood

Wyman

et al. 2017

Geochem Geophys Geosyst

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Magmatism postdating the initiation of continental collision provides insight into the late stage evolution of orogenic belts including the composition of the contemporaneous underlying subcontinental mantle. The Awulale Mountains, in the heart of the Tianshan Orogen, display three types of postcollisional mafic magmatic rocks. (1) A medium to high K calc‐alkaline mafic volcanic suite (∼280 Ma), which display low La/Yb ratios (2.2–11.8) and a wide range of ɛNd(t) values from +1.9 to +7.4. This suite of rocks was derived from melting of depleted metasomatized asthenospheric mantle followed by upper crustal contamination. (2) Mafic shoshonitic basalts (∼272 Ma), characterized by high La/Yb ratios (14.4–20.5) and more enriched isotope compositions (ɛNd(t) = +0.2 – +0.8). These rocks are considered to have been generated by melting of lithospheric mantle enriched by melts from the Tarim continental crust that was subducted beneath the Tianshan during final collisional suturing. (3) Mafic dikes (∼240 Ma), with geochemical and isotope compositions similiar to the ∼280 Ma basaltic rocks. This succession of postcollision mafic rock types suggests there were two stages of magma generation involving the sampling of different mantle sources. The first stage, which occurred in the early Permian, involved a shift from depleted asthenospheric sources to enriched lithospheric mantle. It was most likely triggered by the subduction of Tarim continental crust and thickening of the Tianshan lithospheric mantle. During the second stage, in the middle Triassic, there was a reversion to more asthenospheric sources, related to postcollision lithospheric thinning.

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Section: Resultsmentioning

confidence: 99%

Section: Petrogenesis Of the Early Permian Lower Group Calc-alkaline mentioning

confidence: 99%

Evolving Mantle Sources in Postcollisional Early Permian‐Triassic Magmatic Rocks in the Heart of Tianshan Orogen (Western China)

Tang

Cawood

Wyman

et al. 2017

Geochem Geophys Geosyst

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“…This alteration may have been resulted from low‐grade metamorphism or fluid–rock interactions. Previous studies suggested that elements including Al, Ti, P, HFSEs, REEs (except Ce and Eu), and transition metals are typically immobile, whereas Ca, Na, and LILEs are readily mobilized by alteration (Polat & Hofmann, 2003; Yan et al, 2015). Our samples exhibit relatively constant Na 2 O (1.89–4.04 wt%) and K 2 O (0.97–1.96 wt%) contents with narrow K 2 O/Na 2 O range (0.28–0.99), and the elements of Na 2 O and K 2 O display scattered trends with LOI (Figure 10a,b), suggesting the major elements remained largely immobile.…”

Section: Discussionmentioning

confidence: 99%

Geochronology and geochemistry of a newly identified Permian hornblende gabbro suite in Aqishan–Yamansu Belt, eastern Tianshan, NW China: Implications on petrogenesis and tectonic setting

et al. 2021

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Permian mafic‐ultramafic intrusions have great significance for understanding the geodynamic evolution of the Late Palaeozoic eastern Tianshan Orogen due to containing important information on the nature of mantle sources, crust–mantle interaction, and magmatic differentiation. Increasingly, more Permian mafic‐ultramafic intrusions are discovered in the Jueluotage belt, especially in the Kangguer ductile shear zone, whereas the mafic‐ultramafic intrusions in the Aqishan–Yamansu belt are ill‐informed. In this study, we provide zircon U–Pb geochronological, geochemical, and Sr–Nd–Pb–Hf isotopic data of a newly identified hornblende gabbro suite at the Shaquanzi Fe–Cu deposit in the Aqishan–Yamansu Belt. Zircon U–Pb dating results indicate that the Shaquanzi hornblende gabbro was emplaced at Early Permian (ca. 274–265 Ma). The rocks are calc‐alkaline and have arc‐like geochemical features, including enrichments in large‐ion lithophile elements (LILEs: Rb, Ba, K, Pb and Sr) and light rare‐earth elements (LREEs: Nb, Ta, Zr, Hf, and Ti), and depletions in high‐field‐strength elements (HFSEs) with markedly negative Nb and Ta anomalies. The rocks also exhibit depleted‐mantle isotopic signatures, with positive bulk‐rock εNd(t) values of +3.34 to +4.44 and positive zircon εHf(t) values of +2.8 − +8.7, which are relatively more enriched than those of coeval mafic‐ultramafic intrusions from the Kangguer ductile shear zone, but similar to those in the Central Tianshan Massif. We suggest that the Shaquanzi mafic intrusion suite was generated by 10–30% partial melting of a depleted‐mantle source at over 85 km depth, corresponding to the garnet to garnet‐spinel stability field. And the mantle source had likely been metasomatized by slab‐derived fluids of previous subduction. Integrating with geochemical data of the coeval mafic‐ultramafic and felsic intrusive rocks in the adjacent tectonic belts of eastern Tianshan Orogen, we speculate that the Shaquanzi mafic intrusion was formed in a post‐collision extensional setting, probably triggered by slab breakoff. Metasomatism of the depleted lithospheric mantle had likely occurred during the pre‐Permian subduction of the Kangguer oceanic slab.

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“…Although there has been research about the tectonic setting of Chinese western Tianshan in Paleozoic for a long time, debate continues regarding the final closure time of the South Tianshan Ocean and the amalgamation history of the Tarim, Yili and Junggar Plates (Gao Jun et al, 2009a, b;Li et al, 2015). The proposed final closure time of the South Tianshan Ocean between the TP and YP varies from the end of the Early Carboniferous (Gao Jun et al, 1998;Chen et al, 1999), the end of the Late Carboniferous (Allen et al, 1993;Tang et al, 2010;Yan et al, 2015), to the Late Permian (Zhang et al, 2007;Xiao et al, 2008). Rencently, Han et al (2011) reported that high pressure peak metamorphism of subducted oceanic material of the South Tianshan Ocean occurred at ~319 Ma, as indicated by multiple high-precision isotopic dating, and the oldest stitching granitic plutons in the collisional zone have an upper-age bound of ~300 Ma.…”

Section: Tectonic Settingmentioning

confidence: 99%

Geology, Geochemistry and Zircon U‐Pb Geochronology of Porphyries in the Dabate Mo‐Cu Deposit, Western Tianshan, China: Petrogenesis and Tectonic Implications

Duan

Zhang

Wang

et al. 2017

Acta Geologica Sinica (Eng)

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The Dabate Mo‐Cu deposit is a medium‐sized porphyry‐type deposit in the Sailimu Lake region, western Tianshan, China. We present the geology, geochemistry and zircon U‐Pb geochronology of granite porphyries from the Dabate district with the intent to constrain their tectonic setting and petrogenesis. Porphyries in the Dabate district include granite porphyry I (gray white color with large phenocrysts), granite porphyry II (pink color with small phenocrysts) and quartz porphyry. Granite porphyry II is the Cu and Mo ore‐bearing granitoid in the Dabate deposit. LA‐ICPMS zircon U‐Pb analyses indicate that granite porphyry II was emplaced at 284.2±1.8 Ma. Granite porphyry I and II have similar geochemical features and are both highly fractionated granites: (1) They have high SiO2 content (70.93–80.18 wt% and 72.14–72.64 wt%, respectively), total alkali (7.58–8.95 wt% and 9.35–9.68 wt%, respectively), mafic index (0.95–0.98 and 0.93–0.94, respectively) and felsic index (0.79–0.94 and 0.89–0.91, respectively); (2) They are characterized by pronounced negative Eu anomaly, “seagull‐style” chondrite‐normalized REE patterns and “tetrad effect” of REE; (3) They are rich in Rb, K, Th, Ta, Zr, Hf, Y and REE, but depleted in Sr, P, Ti and Nb. The magma of granite porphyries in Dabate can be interpreted to have been generated by partial melting of the upper crust due to mantle‐derived magma underplating in a post‐collisional extensional setting.

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Petrology and geochemistry of late Carboniferous hornblende gabbro from the Awulale Mountains, western Tianshan (NW China): Implication for an arc–nascent back-arc environment

Cited by 33 publications

References 140 publications

Evolving Mantle Sources in Postcollisional Early Permian‐Triassic Magmatic Rocks in the Heart of Tianshan Orogen (Western China)

Evolving Mantle Sources in Postcollisional Early Permian‐Triassic Magmatic Rocks in the Heart of Tianshan Orogen (Western China)

Geochronology and geochemistry of a newly identified Permian hornblende gabbro suite in Aqishan–Yamansu Belt, eastern Tianshan, NW China: Implications on petrogenesis and tectonic setting

Geology, Geochemistry and Zircon U‐Pb Geochronology of Porphyries in the Dabate Mo‐Cu Deposit, Western Tianshan, China: Petrogenesis and Tectonic Implications

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