Tracing a subducted ridge–transform system in a late Carboniferous accretionary prism of the southern Altaids: Orthogonal sanukitoid dyke swarms in Western Junggar, NW China

Ma, Cambridge; Xiao, Wenjiao; Windley, Brian F.; Zhao, Guosong; Han, Chunming; Zhang, Jien; Luo, Jun; Li, Chao

doi:10.1016/j.lithos.2012.02.005

Cited by 79 publications

(78 citation statements)

References 64 publications

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“…Recently, this speculation is supported by some new evidence found in the Chinese part of the CAOB, e.g. the West Junggar and Chinese Altai terranes (Cai et al, 2010;Geng et al, 2009;Ma et al, 2012;Sun et al, 2009;Tang et al, 2010Tang et al, , 2012aWong et al, 2010;Yin et al, 2010;Zhang et al, 2011a). However, the occurrence and evolution of ridge subduction-related slab windows are still indistinct and insufficiently documented in those areas.…”

Section: Introductionmentioning

confidence: 94%

“…1) (Feng et al, 2012;Li et al, 2004;Ma et al, 2012;Qi, 1993;Tang et al, 2012a;Xu et al, 2008;Yin et al, 2010Yin et al, , 2012. These dikes intruded into Paleozoic granitic plutons and clastic rocks and dip steeply in three directions, i.e.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The tectonic setting of West Junggar has long been controversial, such as a post-collisional environment since the Early Carboniferous (Chen and Arakawa, 2005;Chen and Jahn, 2004;Fan et al, 2007;Han et al, 1997Han et al, , 2006Su et al, 2006;Xu et al, 2012), or a subduction setting in the Late Carboniferous (Geng et al, 2009;Ma et al, 2012;Tang et al, 2010Tang et al, , 2012aXiao et al, 2008Xiao et al, , 2009Yang et al, 2012;Yin et al, 2010;Zhang et al, 2011a,b). Based on the occurrence of the I-type and A-type granites and their undeformed and alkali-enriched characteristics, most granitic plutons in West Junggar were previously interpreted as post-collisional granites (Chen and Jahn, 2004;Xu et al, 2012).…”

Section: Tectonic Setting In the Late Carboniferousmentioning

confidence: 99%

“…The A-type granites were generally produced in the Late Carboniferous and proposed to have formed by partial melting of juvenile basaltic lower crust or lithospheric mantle metasomatized by slab-derived fluids, induced by an upwelling asthenosphere (Chen and Arakawa, 2005;Chen and Jahn, 2004;Su et al, 2006). However, some recent studies demonstrated that upwelling of asthenospheric mantle was a result of a slab window in an arc-related setting (Geng et al, 2009;Ma et al, 2012;Tang et al, 2010Tang et al, , 2012cYin et al, 2010). The Late Carboniferous adakite-like granitic intrusions and diorite-granodiorite porphyry stocks to the west of Keramay are characterized by high Sr and Sr/Y ratios and depleted Nd isotopic composition, which are typical of arc magmatism generated by melting of hot, subducted oceanic crust interacting with mantle components (Geng et al, 2009;Shen et al, 2009;Tang et al, 2010;Zhang et al, 2006).…”

Section: Tectonic Setting In the Late Carboniferousmentioning

confidence: 99%

“…In addition, tectonic setting of the Late Carboniferous to Early Permian (320-290 Ma) magmatic rocks in West Junggar are controversial. The rocks were suggested to have formed in an intra-oceanic or ridge subduction setting (Geng et al, 2009;Ma et al, 2012;Tang et al, 2010Tang et al, , 2012aXiao et al, 2008;Yin et al, 2010;Zhang et al, 2011a,b) or derived from depleted mantle contributions in a post-collisional extensional setting (Chen and Arakawa, 2005;Han et al, 2006;Su et al, 2006;J. Zhou et al, 2008;T.F.…”

Section: Introductionmentioning

confidence: 99%

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A Late Carboniferous–Early Permian slab window in the West Junggar of NW China: Geochronological and geochemical evidence from mafic to intermediate dikes

Yin¹,

Long²,

Yuan³

et al. 2013

Lithos

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Section: Introductionmentioning

confidence: 94%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Tectonic Setting In the Late Carboniferousmentioning

confidence: 99%

Section: Tectonic Setting In the Late Carboniferousmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Late Carboniferous–Early Permian slab window in the West Junggar of NW China: Geochronological and geochemical evidence from mafic to intermediate dikes

Yin¹,

Long²,

Yuan³

et al. 2013

Lithos

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Magnetotelluric imaging of a fossil paleozoic intraoceanic subduction zone in western Junggar, NW China

Yang

Sheng

et al. 2016

JGR Solid Earth

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The fate of subducted oceanic slabs can provide important clues to plate reconstruction through Earth history. Since oceanic slabs in continental collision zones are typically not well preserved, ancient subduction zones have rarely been imaged by geophysical techniques. Here we present an exception from the Darbut belt in the Junggar accretionary collage in the southern Altaids of Asia. We deployed a 182 km long magnetotelluric (MT) profile including 60 broadband sounding sites across the belt. Quality off‐diagonal impedances were inverted by a three‐dimensional scheme to image resistivities beneath the profile. The resistivity model along with MT impedance phase ellipses and induction vectors were tested and interpreted in detail. Combining geological and geophysical observations, mineral physical experiment, and geodynamic modeling results, the MT transect suggests a fossil intraoceanic subduction zone during the Late Paleozoic in the western Junggar that has been well preserved due to lack of significant subsequent tecto‐thermal events.

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Petrogenesis of pillow basalts in West Junggar, NW China: Constraints from geochronology, geochemistry, and Sr–Nd–Pb isotopes

Yang

Tong

et al. 2017

Geological Journal

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West Junggar is located at the southwest margin of the Central Asian Orogenic Belt and includes Silurian pillow basalts of the Mayilashan Formation. The petrogenesis and tectonic setting of these pillow basalts are important for the understanding of the tectonic evolution and metallogeny of the West Junggar area. This paper presents geochronological, geochemical, and whole‐rock Sr–Nd–Pb isotope data from the pillow basalts of the Mayilashan Formation. Zircon LA‐ICP‐MS U–Pb dating of a pillow basalt, which is in conformable contact with the chert, suggests that they were erupted at 437.2 ± 2.2 Ma marking the timing of generation of these rocks as Middle Silurian. Geochemically, all the pillow basalts bear the signature of ocean island basalt (OIB), and are characterized by alkaline affinity with high concentrations of TiO2 (3.28–4.12 wt.%), LILE and LREE enrichment and HREE depletion ((La/Yb)N = 5.5–7.3), with very weak Eu anomalies (Eu/Eu* = 0.96–1.06), and no obvious Nb, Ta, or Ti negative anomalies. Their Sr–Nd–Pb isotopic compositions ((87Sr/86Sr)I = 0.7037–0.7051, εNd(t) = 1.9–2.9, 206Pb/204Pbi = 17.74–18.22, 207Pb/204Pbi = 15.48–15.52, and 208Pb/204Pbi = 36.49–37.86) show Dupal‐like isotopic signature of ophiolites in the southern Paleo‐Asian Ocean. These characteristics indicate that the magmas were derived from a deep OIB reservoir, that is, a depleted but slightly heterogeneous asthenospheric mantle source with ~5–15% partial melting of garnet and spinel lherzolite. Our obtained results, in conjunction with previous published data, allow us to suggest that the alkaline pillow basalts formed in a seamount within an intraoceanic setting, where a larger number of seamounts with different ages occurred in the Paleo‐Asian Ocean.

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Tracing a subducted ridge–transform system in a late Carboniferous accretionary prism of the southern Altaids: Orthogonal sanukitoid dyke swarms in Western Junggar, NW China

Cited by 79 publications

References 64 publications

A Late Carboniferous–Early Permian slab window in the West Junggar of NW China: Geochronological and geochemical evidence from mafic to intermediate dikes

A Late Carboniferous–Early Permian slab window in the West Junggar of NW China: Geochronological and geochemical evidence from mafic to intermediate dikes

Magnetotelluric imaging of a fossil paleozoic intraoceanic subduction zone in western Junggar, NW China

Petrogenesis of pillow basalts in West Junggar, NW China: Constraints from geochronology, geochemistry, and Sr–Nd–Pb isotopes

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