Formation of positive εNd(T) granitoids from the Alataw Mountains, Xinjiang, China, by mixing and fractional crystallization: implication for Phanerozoic crustal growth

Chen, Jiangfeng; Zhou, Taofa; Xie, Zhi; Zhang, Xun; Guo, Xinsheng

doi:10.1016/s0040-1951(00)00177-3

Cited by 55 publications

(27 citation statements)

References 15 publications

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“…40 Ar/ 39 Ar dating on the adakites, Nb-enriched basalts and volcanic rocks in Alataoshan gave plateau ages of 320 ± 1, 319 ± 2 and 306 ± 4 Ma, respectively . Ages of 310-340 Ma for other volcanic rocks in this area were reported by Chen et al (2000). Thus, the MAs spatially associated with these volcanic rocks in Alataoshan are of middle-late Carboniferous age.…”

Section: Chronologysupporting

confidence: 50%

Magnesian andesites in north Xinjiang, China

Zhao

Wang

Xiong

et al. 2008

Int J Earth Sci (Geol Rundsch)

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Middle Devonian magnesian andesites (MAs) are widely distributed in south Altay and Carboniferous MAs are present in Alataoshan and west-and east-Tianshan in the north Xinjiang region. These MAs are andesitic rocks with 53-65% SiO 2 , \1% (0.21-1.08%; average of 0.72%) TiO 2 , and C50 Mg # . Magnesian dacites and diorites, with 52.38-66.91% SiO 2 , \0.30% TiO 2 and C42 Mg # commonly occur with these MAs. Relative to boninites, MAs have lower MgO contents (average 6.39%) but higher Ti, K and Na. They have characteristic flat chondritenormalized REE patterns with weak to no Eu anomalies (Eu depletion, or Eu/Eu* = 0.65-1.15), low (La/Yb) N (0.98-6.4, mostly 4±) and low total REE contents (15-95 ppm). They also have high contents of compatible elements Cr and Ni (72-790 and 29-276 ppm, respectively). Their relative depletion in high field strength elements Nb, Ta and Ti, and relative enrichment in mobile large-ion lithophile elements Rb, K and Pb are evident on primitive mantle-normalized trace element spidergrams. If magnesian andesites are melts coming from the subducted oceanic crust, as proposed elsewhere, then the relatively high Y contents ([15 ppm), low Sr/Y ratios (4.4-6.2), low (La/Yb)N, and high Mg # of the MAs in north Xinjiang provide evidence of interaction of such melts with mantle wedge peridotite. New petrographic, chemical and isotopic [( 143 Nd/ 144 Nd)I = 0.51221-0.51255 (eNd(t) +0.28 to +7.2); ( 87 Sr/ 86 Sr)I = 0.7029-0.7065] data suggest that the petrogenesis of the MAs in the north Xinjiang region may have involved: (1) multiple source materials including subducted oceanic slab, juvenile crustal materials (mainly volcanic-volcanoclassic rocks with low maturity and clear mantle geochemical signatures) coming from the forearc accretionary prism and mantle wedge peridotite; (2) a combination of different petrogenetic processes including partial melting of subducted oceanic slab and juvenile crustal materials, followed by interaction of slab melts with the mantle wedge peridotite; (3) high geothermal gradient creating a high temperature ([1,000°C) environment in a volatile-rich source region; (4) unique tectonic settings including oblique subduction, slab break off resulting in slab window formation and asthenosphere upwelling, and subduction erosion resulting in transfer of forearc accretionary materials into the source region of MA magma.

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Section: Chronologysupporting

confidence: 50%

Magnesian andesites in north Xinjiang, China

Zhao

Wang

Xiong

et al. 2008

Int J Earth Sci (Geol Rundsch)

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“…Bimodal magmatic and volcanic rocks with an alkaline signature of mainly Permian age are widespread throughout the Chinese Tianshan (Allen et al 1993;Chen et al 2000;Hu et al 2000;Mao et al 2005;Gao et al 2006;Zhou et al 2006;Charvet et al 2007;Wang et al 2008a, this issue). The intrusive rocks are quartz diorite, quartz syenite, granodiorite, monzonite, and K-feldspar granite plutons, as well as abundant dykes (Mao et al 2005).…”

Section: Tectonism and Magmatismmentioning

confidence: 98%

New 40Ar/39Ar age constraints on the Late Palaeozoic tectonic evolution of the western Tianshan (Xinjiang, northwestern China), with emphasis on Permian fluid ingress

Jong

Wang

Faure

et al. 2008

Int J Earth Sci (Geol Rundsch)

151

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International audienceLaser-probe dating of mylonite whole-rock samples from the North Tianshan—Main Tianshan fault zone that cross-cuts the North Tianshan domain's southern margin yielded 40Ar/39Ar spectra with 255–285 Ma ages. Biotite from an undeformed, Early Carboniferous granite, which cuts the steep mylonitic foliation in the Proterozoic basement of the Yili arcs's southern margin, gave a 263.4 ± 0.6 Ma plateau age (1σ). Pre-Carboniferous metasediments overlying this basement yielded plateau ages (1σ) of 253.3 ± 0.3 (muscovite) and 252.3 ± 0.3 (biotite) Ma. The Permian ages of mylonites date movement on these ductile, dextral strike-slip shear zones, whereas the mica ages are interpreted by recrystallisation as a result of fluid flow around such transcurrent faults. We propose that the Tianshan's Permian syn-tectonic bimodal magmatism was created in a non-plume-related Yellowstone-like extensional–transtensional tectonic regime. Gold mineralisation, tracing aqueous flow in the crust, peaked in Permian time and continued locally into the Triassic. The picture is emerging that a convective fluid system partly driven by magmatic heat, existed in a strongly fractured and weakened crust with an elevated heat flow, leading to regional-scale isotope resetting. We suggest that surprisingly young isotopic ages in the literature for early orogenic (ultra)high-pressure metamorphism are similarly due to fluid-mediated recrystallisation

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“…The mechanisms involve arc collage produced by oceanic crust subduction, post-collisional mantle-derived magmatism, and magma mixing between the mantle-derived and crust-derived members [60]. The interval covers late Proterozoic to early Paleozoic [61], and late Paleozoic [5]. Through contrasting geochemical features between the basalts and granitoids of the late Carboniferous in the Junggar area, and combining these observations with previous investigations [3,9,22], it can be regarded that the granitoids were generated by partial melting of juvenile basement rocks, which were triggered by the upwelling of the asthenosphere.…”

Section: Petrogenesis and Implications For The Growth Of Continental mentioning

confidence: 99%

Zircon U-Pb and Hf isotopes of volcanic rocks from the Batamayineishan Formation in the eastern Junggar Basin

Zheng

Griffin

et al. 2010

Chin. Sci. Bull.

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An internal structural study was conducted to investigate U-Pb age, trace elements and Hf isotopes of basaltic zircons from the Batamayineishan Formation. The basalt was obtained from drill well San-Can 1 on the eastern Luliang uplift within the Junggar Basin. Trace element data of zircons show that all samples are magmatic, with similar REE patterns, including positive Ce (δCe=5.06-134), but negative Eu (δEu=0.06-0.55) anomalies and enrichment in heavy rare earth elements. Among 25 grains, the concordant ages were subdivided into three groups; ages of 300.4±1.3 Ma (n=11), 339.2±2.7 Ma (n=3) and 392.0±1.7 Ma (n=8). Three remaining grains were nearly concordant, with 206 Pb/ 238 U ages of 510±7, 488±6 and 453±6 Ma, respectively. The youngest concordant age (i.e., 300.4±1.3 Ma) could be interpreted as the formation age of the studied basaltic rock; this is consistent with the sampling position at the upper part of the Batamayineishan Formation. On the other hand, ages such as Ordovician and early Devonian are consistent with the ages of island-arc volcanic rocks (enrichment in Pb) or ophiolites around the basin. Moreover, the positive ε Hf (t) values of the early and middle Paleozoic zircons (+3.6-+10.5) may suggest that the basement traversed by the studied volcanic rocks may be Paleozoic in age, formed from the residual oceanic crust and island-arc complex. The ε Hf (t) values (+4.2-+17.1) of the late Paleozoic (~300.4 Ma) zircons suggest that the basaltic magmas were derived from partial melting of the asthenospheric mantle or depleted lithospheric mantle. These magmas were slightly contaminated by the existence of early-middle Paleozoic materials. The late Carboniferous basalts represent direct eruption of mantle-derived magmas at the upper crustal level during a post-collisional tectonic setting. We therefore consider that extensive vertical growth of the continental crust to have occurred before the late Carboniferous. Batamayineishan Formation, zircon U-Pb ages, Hf isotopes, continental crust growth, eastern Junggar Basin Citation:Su Y P, Zheng J P, Griffin W L, et al. Zircon U-Pb and Hf isotopes of volcanic rocks from the Batamayineishan Formation in the eastern Junggar Basin.

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Formation of positive εNd(T) granitoids from the Alataw Mountains, Xinjiang, China, by mixing and fractional crystallization: implication for Phanerozoic crustal growth

Cited by 55 publications

References 15 publications

Magnesian andesites in north Xinjiang, China

Magnesian andesites in north Xinjiang, China

New 40Ar/39Ar age constraints on the Late Palaeozoic tectonic evolution of the western Tianshan (Xinjiang, northwestern China), with emphasis on Permian fluid ingress

Zircon U-Pb and Hf isotopes of volcanic rocks from the Batamayineishan Formation in the eastern Junggar Basin

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