Postcollisional mantle-derived magmatism, underplating and implications for basement of the Junggar Basin

Han, Bao‐Fu; He, Guojian; Wang, Shiguang

doi:10.1007/bf02878509

Cited by 70 publications

(47 citation statements)

References 9 publications

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“…2 and 3a). The Permian magmas were then emplaced in a post-collisional setting and several authors suggested that slab break-off and lithospheric delamination may explain their mantle signature (Han et al, 1999(Han et al, , 2009Chen and Jahn, 2004;Zhao et al, 2008;Shu et al, 2010). By Late Carboniferous -Early Permian, the Junggar Basin, disconnected from the Palaeo-Tethys ocean (Sha et al, 2011), initiated as a half-graben structure in a post-collisional extensional setting (Qiu et al, 2005(Qiu et al, , 2008Yang et al, 2012).…”

Section: The Carboniferous -Permian Evolutionmentioning

confidence: 99%

Reconstructing the Late Palaeozoic – Mesozoic topographic evolution of the Chinese Tian Shan: available data and remaining uncertainties

et al. 2013

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Abstract. The topographic evolution of continents and especially the growth and dismembering of mountain ranges plays a major role in the tectonic evolution of orogenic systems, as well as in regional or global climate changes. A large number of studies have concentrated on the description, quantification and dating of relief building in active mountain ranges. However, deciphering the topographic evolution of a continental area submitted to recurrent tectonic deformation over several hundred millions of years remains a challenge. Here we present a synthesis of the tectonic, geochronological and sedimentological data available on the intracontinental Tian Shan Range to describe its general topographic evolution from Late Palaeozoic to Early Tertiary. We show that this evolution has occurred in two very distinct geodynamic settings, initiating during the Carboniferous in an ocean subduction -continent collision tectonic context before becoming, from Early Permian, purely intra-continental. We show that during most of the Mesozoic, the topography is mostly characterized by a progressive general decrease of the relief. Nonetheless localized, recurrent deformation induced the formation of small-scale reliefs during that period. These deformations were driven by far field effects of possibly several geodynamic processes in a way that still remains to be fully understood.

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Section: The Carboniferous -Permian Evolutionmentioning

confidence: 99%

Reconstructing the Late Palaeozoic – Mesozoic topographic evolution of the Chinese Tian Shan: available data and remaining uncertainties

et al. 2013

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“…The Bogda orogenic belt is situated between the Juggur and the Turpan-Hami Precambrian terranes ( Fig. 1b) with sub-E-W trending direction, and is interpreted to be a late Paleozoic rift (He et al, 1995;Han et al, 1999;Gu et al, 2001a), arc Coleman, 1989) or an intra-arc basin (Xiao et al, 2004) by different authors. Further to the northeast, the Kelameili-Harlik orogenic belt is characterised by Devonian-Carboniferous arc volcanic rocks (He et al, 1995;Ma et al, 1997;Gu et al, 1999).…”

Section: Geological Settingsmentioning

confidence: 99%

“…Such an inference is also consistent with conclusion of Xiao et al (1992), Li and Xiao (1999), Li et al (2003Li et al ( , 2006 and Liu (2005) who, based on tectonic research of eastern Tianshan, proposed that intense Triassic (Indosinian) compression of this area was induced by northwards convergence of the Paleo-Tethyan ocean plate. Therefore, the high temperatures and pressures met with genesis of the Weiya quartz syenite could be attributed to the doubly thickened continental crust (Deng et al, 2004) as a result of intra-continental subduction-collision, to the delamination of the lithosphere root (Deng et al, 2004;Sun et al, 2008), underplating of mantle-derived magma (Han et al, 1999), and subsequent regional extension. Heat from the underplated magma triggered partial melting of overlying lower crustal rocks and generation of the quartz syenitic liquid.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

Sr, Nd and O isotopic characters of quartz syenite in the Weiya magmatic complex from eastern Tianshan in NW China: Melting of the thickened juvenile lower crust

Zunzhong²,

et al. 2010

Geochem. J.

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New Sr-Nd-O isotopic data are reported for the early Triassic (early Indosinian) Weiya quartz syenite from eastern Central Tianshan, northwestern China, with the aim of documenting its possible source(s), constraining its petrogenesis and discussing its tectonic implications. Whole-rock Rb-Sr isochron of the Weiya quartz syenite rock yielded an age of 246.5 ± 4.8 Ma, which is well consistent with zircon SHRIMP U-Pb age. Additionally, the rock exhibits positive ε Nd (t) value (+1.36 to +1.66), medium I sr (0.7088 to 0.7090), "normal" δ 18 O value (6.9 to 8.1‰) and young Nd model ages (T DM = 0.88 to 0.91 Ga). Combined with their petrogaphic and geochemical characters, the Weiya quartz syenite is suggested to have been generated by partial melting of juvenile lower crust rocks at high temperature. The partial melting is attributed to intra-continental subduction, which resulted in thickening of the continental crust, delamination of the lithosphere root, underplating of mantle-derived magma and subsequent regional extension. Heat from underplated mantle magma caused melting of the overlying lower crustal rocks and consequent generattion of the quartz syenitic liquid. It is supposed that the intra-continental subduction was induced by tectonic conversion from the Paleo-Asian subduction-collision system to the Paleo-Thethys regime during the latest Permian or earliest Triassic in the eastern Tianshan.

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“…mineralization occurred after the formation of the granite porphyry, and previous studies suggested that the metallogenic age of the asphaltic uranium deposit was similar to the intrusion age of the diabase veins [23]. Mineralization occurred after the formation of the granite porphyry, when the region had been uplifted above sea level [26,39]. U-Pb isotopic dating of the asphaltic uranium in the Baiyanghe deposit suggested that tectonic movement and hydrothermal activity may have occurred during the Late Cretaceous and Paleogene after the Xuemisitan region entered the inland evolution stage [40].…”

Section: Alteration and Uranium Explorationmentioning

confidence: 98%

“…Fluoritization is also an important type of hydrothermal alteration and was closely related to the uranium mineralization [39][40][41][42][43]. Furthermore, illite alteration (short-and medium-wavelength), which was equivalent to hydromicazation, occurred because of hydrothermal alteration.…”

Section: Alteration and Uranium Explorationmentioning

confidence: 99%

Hyperspectral Alteration Information from Drill Cores and Deep Uranium Exploration in the Baiyanghe Uranium Deposit in the Xuemisitan Area, Xinjiang, China

Liu

et al. 2017

Remote Sensing

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Abstract:The Baiyanghe uranium deposit is a currently important medium-sized deposit in the Xuemisitan area, Xinjiang. The hydrothermal alteration in this deposit is closely related to the uranium mineralization of the deposit. In this study, hyperspectral data are collected from drill cores in the Baiyanghe uranium deposit using a FieldSpec4 visible-shortwave infrared spectrometer to study the hydrothermal alteration. The results reveal that the altered mineral assemblages have obvious zonation characteristics: (1) the upper section comprises long-wavelength illite and minor hematite and montmorillonite; (2) the middle section contains three types of illite (long-, mediumand short-wavelength illite) and hematite; and (3) the lower section includes short-wavelength illite, chlorite and carbonate. Additionally, the variety in the characteristic absorption-peak wavelength of illite at 2200 nm gradually shifts to shorter wavelength and ranges between 2195 nm and 2220 nm with increasing depth, while the SWIR-IC (short-wavelength infrared illite crystallinity, a dimensionless quantity) of the drill holes gradually increases from 0.2 to 2.1. These patterns reflect the hydrothermal fluid activity in the deposit, which features relatively high-temperature, high-pressure hydrothermal fluid in the deeper section and low-temperature, low-pressure hydrothermal fluid in the shallower section. Additionally, the uranium mineralization is located near the fracture zone, which represents the center of hydrothermal fluid activity or mineralization. This area has abundant alteration minerals, and the minerals illite (short-and medium-wavelength), hematite and fluorite can be used as uranium-prospecting indicators for uranium exploration in the deeper sections of the Baiyanghe uranium deposit.

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Postcollisional mantle-derived magmatism, underplating and implications for basement of the Junggar Basin

Cited by 70 publications

References 9 publications

Reconstructing the Late Palaeozoic – Mesozoic topographic evolution of the Chinese Tian Shan: available data and remaining uncertainties

Reconstructing the Late Palaeozoic – Mesozoic topographic evolution of the Chinese Tian Shan: available data and remaining uncertainties

Sr, Nd and O isotopic characters of quartz syenite in the Weiya magmatic complex from eastern Tianshan in NW China: Melting of the thickened juvenile lower crust

Hyperspectral Alteration Information from Drill Cores and Deep Uranium Exploration in the Baiyanghe Uranium Deposit in the Xuemisitan Area, Xinjiang, China

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