Petrogenesis of syenite–granite suites from the Bryansky Complex (Transbaikalia, Russia): implications for the origin of A-type granitoid magmas

Litvinovsky, B.A.; Jahn, Bor‐ming; Zanvilevich, A. N.; Saunders, Andrew D.; Poulain, S.; Kuzmin, D. V.; Reichow, Marc K.; Титов, А. В.

doi:10.1016/s0009-2541(02)00142-0

Cited by 215 publications

(81 citation statements)

References 49 publications

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“…Notably, pyroxene and olivine are rarely found in the Weiya quartz syenite, which is in contrast to many syenitic rocks described elsewhere (Zhao et al, 1995;Eby et al, 1998;Tchameni et al, 2001;Litvinovsky et al, 2002;Vernikovsky et al, 2003;Wang et al, 2005;Yang et al, 2005). The general presence of Fe-rich biotite and ferrohornblende and absense of alkali mafic minerals, such as arfvedsonite, riebeckite and sodium pyroxene suggest that the Weiya quartz syenite is compatible with aluminous A-type granitoids in the Lachlan fold belt of SE Australia (King et al, 1997), but distinguishable from peralkaline A-type granitoids .…”

Section: Fig 2 Remote Sensing Image and Geological Map Of The Weiyamentioning

confidence: 63%

“…Alkaline igneous rocks are typically found in extensional tectonic settings (Whalen et al, 1987;Litvinovsky et al, 2002;Wu et al, 2002;Vernikovsky et al, 2003;Wang et al, 2005;Yang et al, 2005;Sun et al, 2008). From this point of view, a study of alkaline igneous rocks will provide insight into regional tectonic environments.…”

Section: (A) Schematic Map Of Tectonic Units Of Paleo-tethys and Thmentioning

confidence: 99%

“…Several genetic models have been proposed to interpret the formation of syenites, which mainly include: (1) partial melting of crustal rocks in a closed system at pressures typical of the base of over-thickened crust (Huang and Wyllie, 1986;Deng et al, 1998;Tchameni et al, 2001), (2) partial melting of mantle peridotites with subsequent differentiation (Bailey, 1987;Whalen et al, 1996;Conceicão et al, 2000;Litvinovsky et al, 2002;Wang et al, 2005;Yang et al, 2005), (3) fractional crystallization of alkali basalt magma (Parker, 1983;Middlemost, 1985;Brown and Becker, 1986;Thorpe and Tindle, 1992) or fractionation caused by silicate liquid immiscibility (Rajesh, 2003), and (4) magma mixing processes, particularly mixing of basic and silicic melts with subsequent differentiation of the hybrid liquid (Barker et , 1975;Sheppard, 1995;Zhao et al, 1995;Wickham et al, 1995;Vernikovsky et al, 2003). In doing so, it is important to have an integrated study of major elements, trace elements and ragiogenic isotopes in continental igneous rocks in order to decipher the nature of their sources (e.g., Zhang, S.-B.…”

Section: Petrogenesis Of Weiya Quartz Syenite Weiya Quartz Syenite: Cmentioning

confidence: 99%

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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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Section: Fig 2 Remote Sensing Image and Geological Map Of The Weiyamentioning

confidence: 63%

Section: (A) Schematic Map Of Tectonic Units Of Paleo-tethys and Thmentioning

confidence: 99%

Section: Petrogenesis Of Weiya Quartz Syenite Weiya Quartz Syenite: Cmentioning

confidence: 99%

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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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“…far exceeding the normal crust thickness. The Sr-Nd isotope data advocate the main role of mantle-derived material in the source region from which the alkali-rich syenitic and granitic magmas were produced (Litvinovsky et al, 2002). Also, the alkali monzodiorite-syenite series that are widespread in Transbaikalia are explained by fractional crystallization from tephritic magma intrusions at ca.…”

Section: Regional Evidence For the Proposed Modelmentioning

confidence: 90%

“…However, there is no unequivocal indication that would permit either a mixed upper crust-mantle source or a type II enriched mantle source to be favoured. Regional studies of Transbaikalian granitoids consider geochemical, geophysical and geodynamic indications for both crustal and mantle input that trigger granitic melt generation of all petrochemical series (Jahn et al, 2000;Kovalenko et al, 1996;Litvinovsky et al, 2002). The isotopic heterogeneity of these granites was predetermined by the isotopic heterogeneity of their sources (Kovalenko et al, 1996).…”

Section: Regional Evidence For the Proposed Modelmentioning

confidence: 99%

Isotope systematics of ore-bearing granites and host rocks of the Orlovka-Spokoinoe mining district, eastern Transbaikalia, Russia

Dolgopolova

Seltmann

Stanley

et al. 2005

Mineral Deposit Research: Meeting the Global Challenge

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Abstract. Pb, Rb and Sr isotope data are reported for the Khangilay, Orlovka and Spokoinoe granite massifs and their host rocks in the OrlovkaSpokoinoe mining district, Eastern Transbaikalia, Russia. Pb isotope analyses indicate one common Pb source for all three granite massifs reflecting a homogenous source melt from which all magmatic members generated. Pb isotope systematics identified two possible scenarios for the source of Li-F granites: 1) a crust-mantle source where a mixture of MORB and continental-derived material were brought together in an orogenic environment; and 2) a type II enriched mantle source where subducted continental material could have been strongly implicated in volcanic suites. New Rb-Sr isotope age data yielded a 143.8±4.2 Ma age for barren granites of Orlovka and Khangilay massifs.

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Lithospheric thinning and reworking of Late Archean juvenile crust on the southern margin of the North China Craton: evidence from the Longwangzhuang Paleoproterozoic A‐type granites and their surrounding Cretaceous adakite‐like granites

et al. 2012

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In the Longwangzhuang area along the southern margin of the North China Craton (NCC), a layer of Cretaceous K‐feldspar granites surrounds Paleoproterozoic granites. The Paleoproterozoic granites are enriched in sodic ferrogedrite and show low Al2O3 (12.3–13.0 wt%) and aluminum saturation index (ASI) (0.93–1.09) with high Zr (609–966 ppm), Y (47.2–96.7 ppm) and Nb (58.7–97.7 ppm) concentrations, resembling A‐type granites. The Cretaceous K‐feldspar granites have relatively high Sr (145–419 ppm), Ba (1252–1660 ppm), Sr/Y (19–127), La/Yb (36–56) ratios, but low Y (4.01–8.88 ppm) and Yb (0.46–0.99 ppm), geochemically resembling adakite‐like rocks. However, these Cretaceous adakite‐like K‐feldspar granites have rather low MgO (0.08–0.26 wt%), Al2O3 (13.6–14.5 wt%), Mg# (11–23), Cr (2.30–4.61 ppm) and high initial 86Sr/87Sr (0.7098–0.7118), as well as abundant K‐feldspar minerals, and are different from typical adakite. Zircon LA–ICP–MS geochronology shows that the two types of granites investigated in this study formed at 1616 ± 20 Ma and 140 ± 1 Ma, respectively. However, zircons from both the Paleoproterozoic and Cretaceous granites yield similar two‐stage Hf model ages at ca. 2.5–2.6 Ga, suggesting the reworking of Late Archean juvenile crust. The Paleoproterozoic A‐type granites show enriched Nd–Hf isotopic features but high whole‐rock oxygen isotopes. These rocks may have formed from partial melting of restitic crustal material during lithospheric thinning, along with extension and experienced crystal fractionation of plagioclase, apatite and magnetite. The Cretaceous adakite‐like K‐feldspar granites were formed by local anatexis of TTG rocks from the Taihua Group, with amphibole as the major residual phase. The local anatexis and accompanying migmatisation suggest crustal compression and possible transpression. Therefore, the lithospheric thinning in the NCC should have taken place after 140 Ma on the southern margin of the NCC. Copyright © 2012 John Wiley & Sons, Ltd.

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Petrogenesis of syenite–granite suites from the Bryansky Complex (Transbaikalia, Russia): implications for the origin of A-type granitoid magmas

Cited by 215 publications

References 49 publications

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

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

Isotope systematics of ore-bearing granites and host rocks of the Orlovka-Spokoinoe mining district, eastern Transbaikalia, Russia

Lithospheric thinning and reworking of Late Archean juvenile crust on the southern margin of the North China Craton: evidence from the Longwangzhuang Paleoproterozoic A‐type granites and their surrounding Cretaceous adakite‐like granites

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