An Early Permian (ca. 280Ma) silicic igneous province in the Alxa Block, NW China: A magmatic flare-up triggered by a mantle-plume?

Wei, Dan; Li, Xian‐Hua; Wang, Qiang; Tang, Gong‐Jian; Liu, Yü

doi:10.1016/j.lithos.2014.01.018

Cited by 76 publications

(58 citation statements)

References 126 publications

(158 reference statements)

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“…4a). This age is similar to the ages (284-278 Ma) of host granitoids and granodiorites (Dan et al, 2014a). For the Yamaitu pluton, the host granodiorite (09AL155) and enclave (09AL161) samples gave weighted mean 206 Pb/ 238 U ages of 270 ± 2 Ma (Fig.…”

Section: Zircon U-pb Dating Resultssupporting

confidence: 77%

“…The monzonitic enclaves are mainly present in the monzogranites and are composed of plagioclase (35-40 vol.%), alkali feldspar (10-15 vol.%), hornblende (20-30 vol.%), biotite (10-15 vol.%), quartz (10-15 vol.%) and accessory minerals. These assemblages are distinct from those of the host monzogranites and granodiorites, which have hornblende contents of 0-5 vol.% (Dan et al, 2014a). The dioritic enclaves in the granodiorites consist of plagioclase (30-40%), alkali feldspar (5-15 vol.%), quartz (10-20 vol.%), biotite (20-35 vol.%), hornblende (5-10 vol.%) and accessory minerals.…”

Section: Bayannuoergong Batholithmentioning

confidence: 92%

“…The Bayannuoergong batholith was previously described by Dan et al (2014a). It consists mainly of coarse monzogranites and granodiorites, along with a few diorites and A-type granites and some later felsic dykes (Fig.…”

Section: Bayannuoergong Batholithmentioning

confidence: 99%

“…Apatite is a common accessory mineral in these MMEs, occurring as acicular crystals. The main rock types, including monzogranites and granodiorites and A-type granites, were formed contemporaneously at~280 Ma (Dan et al, 2014a).…”

Section: Bayannuoergong Batholithmentioning

confidence: 99%

“…Nonetheless, some large volumes of silicic magmas are clearly generated by crystal fractionation of primary mantle-derived magmas accompanied by some assimilation of local wall-rocks (Deering et al, 2011;Rooney and Deering, 2014). The newly reported 0.05 M km 2 Alxa silicic igneous province (SIP) is composed predominantly of 280 Ma granites (Dan et al, 2014a) and magmatic underplating is confirmed by the coeval basaltic magmas. Interestingly, many mafic microgranular enclaves (MMEs), whose occurrences are not common in SIP, were reported in the granitoids (e.g., Zhang et al, 2012).…”

Section: Introductionmentioning

confidence: 96%

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Overlapping Sr–Nd–Hf–O isotopic compositions in Permian mafic enclaves and host granitoids in Alxa Block, NW China: Evidence for crust–mantle interaction and implications for the generation of silicic igneous provinces

Wei

Wang

et al. 2015

Lithos

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Section: Zircon U-pb Dating Resultssupporting

confidence: 77%

Section: Bayannuoergong Batholithmentioning

confidence: 92%

Section: Bayannuoergong Batholithmentioning

confidence: 99%

Section: Bayannuoergong Batholithmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 3 more Smart Citations

Overlapping Sr–Nd–Hf–O isotopic compositions in Permian mafic enclaves and host granitoids in Alxa Block, NW China: Evidence for crust–mantle interaction and implications for the generation of silicic igneous provinces

Wei

Wang

et al. 2015

Lithos

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Detrital zircon geochronology of the Jurassic strata in the western Ordos Basin, North China: Constraints on the provenance and its tectonic implication

et al. 2017

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U–Pb detrital zircon data from the Jurassic strata in the western Ordos Basin (WOB) show significant age differences between formations, from lower to upper including the Yan'an, Zhiluo, Anding, and Fenfanghe formations. The main peaks in the detrital zircon age spectra of the Yan'an Formation are at ca. 245, 444, 1813, and 2,387 Ma, which resemble those of the underlying Triassic strata in the WOB. Combined with the occurrence of reworked sporopollen and carbonate debris, the sediments of the Yan'an Formation are interpreted to be potentially recycled from the residual Triassic highlands. The overlying Zhiluo Formation contains detrital zircons mostly in the 260–290 Ma age range with only one peak at 269 Ma, reflecting primary derivations from the Permian granites in the Yinshan Belt to the north and/or the Alxa Block to the northwest. The detrital zircon age compositions of the Anding Formation, however, are most varied, with one prominent age peak at 274 Ma and several other minor peaks at 348 Ma, 447, 932, 1641, 2143, and 2514 Ma, reflecting complex origins. The uppermost syntectonic Fenfanghe Formation, contains detrital zircons with similar age compositions with the Yan'an Formation, once again interpreted as the result of recycled sedimentation. These two phases of multicycle sedimentation in the WOB reveals two intense tectonic events in the Late Triassic and Late Jurassic, whereas the provenance transition between the Yan'an and Zhiluo formations implies a less intense but extensive event in the Middle Jurassic. The complex age composition of the Anding Formation, however, are possibly as the result of climate change corresponding to the change of petrology and sediment colour. These Early‐Middle Mesozoic tectonic events evidenced by the U–Pb ages record the tectonic transition of the North China Block from the Tethys to the paleo‐Pacific tectonic domains.

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Petrogenesis of the early Permian Yejili mafic–ultramafic intrusion in the Alxa Block, western margin of the North China Craton

Jiao

Wang

et al. 2017

Geological Journal

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The ~287 Ma Yejili mafic–ultramafic intrusion in the southern Alxa Block mainly consists of lherzolite, wehrlite, and gabbro. Rocks from the lherzolite and wehrlite have olivine with Fo values ranging from 87.4 to 88.6 mol.% and from 81.6 to 87.4 mol.%, respectively, indicating crystallization from a moderately evolved magma, that is a mixing of 5% to 7% upper crust contaminant with the primitive magma modelling by Sr–Nd isotopic compositions. Samples from the Yejili intrusion generally have low and variable PGE (0.2 to 4.7 ppb) and display trough‐like primitive mantle‐normalized chalcophile element patterns with relatively high Cu/Pd ratios (40,967 to 412,727) and positive correlation between Y/Pd and Y/Pt ratios, indicating derivation possibly from sulphide‐saturated magmas. However, the small degree of crustal contamination and high Ni concentrations of olivine from lherzolite and wehrlite suggest possible small‐scale sulphide segregation for the Yejili intrusion. In addition, the positive correlation between Fo and Ni concentrations of olivine from the wehrlite suggests the sulphide segregation may have occurred in a deep‐seated staging magma chamber and the sulphide did not enter into the shallow magma chamber because of the high densities. On the other hand, the Yejili intrusion has εNd(t) values (+1.1 to +2.6) much lower than the corresponding depleted mantle and the initial 206Pb/204Pb ratios ranging from 17.88 to 18.11, indicating a weakly depleted source. In addition, the slight enrichment of LREE relative to HREE and positive LILE and negative HFSE (e.g., Nb, Ta, Zr, and Hf) anomalies in primitive mantle‐normalized trace element patterns of rocks from the Yejili intrusion differ from MORB and OIB from the convecting mantle, suggesting the weakly depleted source may have resulted from the metasomatism of the subcontinental lithospheric mantle by slab‐derived fluid/melt. Therefore, the arc‐like geochemical features and low Ca concentration of olivine from lherzolite and wehrlite for the Yejili intrusion indicate a subduction‐related origin, rather than an extensional environment. We thus suggest that the early Permian magmatism in the periphery of the Alxa Block was associated with southward subduction of the Paleo‐Asian Ocean.

show abstract

An Early Permian (ca. 280Ma) silicic igneous province in the Alxa Block, NW China: A magmatic flare-up triggered by a mantle-plume?

Cited by 76 publications

References 126 publications

Overlapping Sr–Nd–Hf–O isotopic compositions in Permian mafic enclaves and host granitoids in Alxa Block, NW China: Evidence for crust–mantle interaction and implications for the generation of silicic igneous provinces

Overlapping Sr–Nd–Hf–O isotopic compositions in Permian mafic enclaves and host granitoids in Alxa Block, NW China: Evidence for crust–mantle interaction and implications for the generation of silicic igneous provinces

Detrital zircon geochronology of the Jurassic strata in the western Ordos Basin, North China: Constraints on the provenance and its tectonic implication

Petrogenesis of the early Permian Yejili mafic–ultramafic intrusion in the Alxa Block, western margin of the North China Craton

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