Petrogenesis of Carboniferous rift-related volcanic rocks in the Tianshan, northwestern China

Linqi, Xia; Xu, Xueyi; Zuchun, Xia; Li, Xiangmin; Ma, Zhong-Pin; Li-she, Wang

doi:10.1130/b25243.1

Cited by 221 publications

(135 citation statements)

References 23 publications

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“…Nevertheless, it is uncertain whether such covariations between the major and trace elements indicate fractional crystallization of basaltic magmas or reflect the nature of magma sources. However, the increasing Zr/Nb (\10) ratios are accompanied by decreasing Ce/Y ratios (not shown) pointing to a variable degree of partial melting rather than a fractional crystallization process (e.g., Baker et al 1997;Xia et al 2004;Viccaro and Cristofolini 2008;Saccani et al 2014). Similar inferences are derived from the (La/Sm) PM vs. (Tb/Yb) PM diagram (Fig.…”

Section: Magma Sourcesupporting

confidence: 64%

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

et al. 2017

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This study concentrates on the petrological and geochemical investigation of mafic rocks embedded within the voluminous Triassic June Complex of the central Sanandaj-Sirjan zone (Iran), which are crucial to reconstruct the geodynamics of the Neotethyan passive margin. The Triassic mafic rocks are alkaline to sub-alkaline basalts, containing 43.36-49.09 wt% SiO 2 , 5.19-20.61 wt% MgO and 0.66-4.59 wt% total alkalis. Based on MgO concentrations, the mafic rocks fall into two groups: cumulates (Mg# = 51.61-58.94) and isotropic basaltic liquids (Mg# = 24.54-42.66). In all samples, the chondrite-normalized REE patterns show enrichment of light REEs with variable (La/Yb) N ratios ranging from 2.48 to 9.00, which confirm their amalgamated OIB-like and E-MORB-like signatures. Enrichment in large-ion lithophile elements and depletion in high field strength elements (HFSE) relative to the primitive mantle further support this interpretation. No samples point to crustal contamination, all having undergone fractionation of olivine ? clinopyroxene ? plagioclase. Nevertheless, elemental data suggest that the substantial variations in (La/Sm) PM and Zr/Nb ratios can be explained by variable degrees of partial melting rather than fractional crystallization from a common parental magma. The high (Nb/Yb) PM ratio in the alkaline mafic rocks points to the mixing of magmas from enriched and depleted mantle sources. Abundant OIB alkaline basalts and rare E-MORB appear to be linked to the drifting stage on the northern passive margin of the Neotethys Ocean.

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Section: Magma Sourcesupporting

confidence: 64%

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

et al. 2017

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“…While the alternative rift model (e.g. Xiao et al, 1992;Che et al, 1996;Xia et al, 2004Xia et al, , 2008 would have generated a relatively low-relief topography distributed over most of the present day Chinese Tian Shan area, the subduction -collision model probably gave birth to a dissected, high relief, Andean-to Alpine-type topography (Fig. 3a).…”

Section: Discussionmentioning

confidence: 99%

“…The first models imply that the Late Carboniferous -Early Permian lavas that are widely exposed in the Yili block were emplaced in a continental rift setting (e.g. Xiao et al, 1992;Che et al, 1996;Xia et al, 2004Xia et al, , 2008. Based on geochemical analysis and zircon U/Pb dating of the various Early to Middle Carboniferous volcanics and ophiolite suites occurring in the North Tian Shan block and indicative of an oceanic domain, Xia et al (2005) suggested that this North Tian Shan Ocean was a Early Carboniferous shortlived ocean which closed before Late Carboniferous generating the North Tian Shan Middle Carboniferous ophiolite suite.…”

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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“…The origin of these mafic rocks has been a matter of debate in three competing models: 1) mantle plume or crustal rifting (Che and Liu, 1996;Xia et al, 2004bXia et al, , 2008, which predicts a dominant role for an upwelling deep-seated mantle plume impinging on the lithosphere (Xia et al, 2004b(Xia et al, , 2008; 2) an island arc model, which suggests a subduction of the Paleo-Tianshan Oceanic Plate Zhou et al, 2004;Zhu et al, 2005Zhu et al, , 2009; or 3) a post-collisional model that invokes slab break-off and subsequent asthenospheric upwelling after the collision between the Junggar plate and the Yili terrane (e.g., Han et al, 2010;Yuan et al, 2010). In this study, we determined plagioclase 40 Ar/ 39 Ar ages and undertook whole rock geochemical and Sr-Nd isotope analyses, electron microprobe analyses of clinopyroxene major element compositions and LA-ICPMS clinopyroxene trace element analyses for the Luotuogou gabbros north of Baluntai town in the Central Tianshan Terrane (Fig.…”

Section: Introductionmentioning

confidence: 99%

Metasomatized lithosphere–asthenosphere interaction during slab roll-back: Evidence from Late Carboniferous gabbros in the Luotuogou area, Central Tianshan

Tang

Wang

Wyman

et al. 2012

Lithos

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Petrogenesis of Carboniferous rift-related volcanic rocks in the Tianshan, northwestern China

Cited by 221 publications

References 23 publications

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

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

Metasomatized lithosphere–asthenosphere interaction during slab roll-back: Evidence from Late Carboniferous gabbros in the Luotuogou area, Central Tianshan

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