Generation of peraluminous granitic magma in a post-collisional setting: A case study from the eastern Qilian orogen, NE Tibetan Plateau

Yang, He; Zhang, Hongfei; Luo, Biji; Gao, Zhong Feng; Guo, Liang; Xu, Wenchao

doi:10.1016/j.gr.2016.04.006

Cited by 69 publications

(47 citation statements)

References 93 publications

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“…The composition of the samples analysed in this study indicates low‐pressure ( P ≤ 5 kbar) conditions (Figure a,b), suggesting derivation of their parent magma from shallow crustal levels. Moreover, compared with granitic melts generated under H 2 O‐saturated conditions, melts generated under H 2 O‐unsaturated conditions commonly have lower normative An, Ab, and Or contents (Figure ; Yang et al, , and references therein). Additionally, the samples are characterized by relatively high K 2 O/Na 2 O ratios (mostly >1.0) and negative Eu anomalies (Figure a), which indicates a dominantly granitic melt generated under inconsistent H 2 O‐saturated conditions.…”

Section: Discussionmentioning

confidence: 99%

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Geochronology and petrogenesis of Neoproterozoic S‐type granites from the Qilian Block, north‐west China, and their geological implications

Liu

Ren

et al. 2018

Geological Journal

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Early Neoproterozoic granites rarely outcrop in the Qilian Orogenic Belt (QOB) at the north‐eastern margin of the Qinghai–Tibet Plateau; however, they are vital to understanding the Precambrian evolution of the QOB. Thus, we present an integrated study, comprising petrology, geochronology, and whole‐rock geochemistry of two Early Neoproterozoic granitic plutons (Baihuagou and Yamacha plutons) in the eastern Qilian Block (QB). The results provide three key findings. First, their magma emplacement age is ca. 900 Ma (i.e., 918 Ma for Baihuagou and 910 Ma for Yamacha), and the two plutons have similar high‐K calc‐alkaline, strongly peraluminous characteristics, with slight enrichment in light rare earth elements; weak negative Eu anomalies; enrichment in large‐ion lithophile elements (e.g., K, Th, Ba, and Rb); strong depletion in Ti; and weak depletion in Nb, Ta, and, Sr. These characteristics indicate that the granites from these plutons are S‐type granites. Second, the two‐mica granite and gneissic granite samples may have been formed by partial melting of ancient crustal material (mainly psammitic rocks), with contributions from a meta‐igneous component, under high‐temperature and low‐pressure conditions. Third, new data from this study, combined with previously reported dates, indicate a continental margin arc setting for the QB during the Early Neoproterozoic (ca. 900 Ma).

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Section: Discussionmentioning

confidence: 99%

“…CIPW‐normative An–Ab–Or diagram for the Huangyuan granite samples (Yang et al, , and references therein). Data sources as in Figure [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Discussionmentioning

confidence: 99%

Geochronology and petrogenesis of Neoproterozoic S‐type granites from the Qilian Block, north‐west China, and their geological implications

Liu

Ren

et al. 2018

Geological Journal

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“…Given the peraluminous nature of some samples in this study, sediment effect on Nd-Hf isotopic decoupling should be considered (Patchett et al, 1984;Chauvel et al, 2008). The present-day sedimentary materials generally have elevated Ԑ Hf at a given Ԑ Nd (Chauvel et al, 2008) (Huang et al, 2015;Yang et al, 2016). Compared to the twomica granites (Yang et al, 2016) and S-type granitoids (Huang et al, 2015) (Zhang et al, 1995;Chen et al, 2007).…”

Section: Source Constraintsmentioning

confidence: 97%

“…The present-day sedimentary materials generally have elevated Ԑ Hf at a given Ԑ Nd (Chauvel et al, 2008) (Huang et al, 2015;Yang et al, 2016). Compared to the twomica granites (Yang et al, 2016) and S-type granitoids (Huang et al, 2015) (Zhang et al, 1995;Chen et al, 2007). Thus, the isotopic data indicate limited contributions from highly enriched upper crust.…”

Section: Source Constraintsmentioning

confidence: 99%

Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Huang

Niu

2017

Lithos

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“…Post‐collision extension occurred in the Late Silurian–Late Devonian due to the breakoff of the subducted Qilian Ocean slab (Song, Niu, Su, Zhang, et al, ; Wu et al, ; Xiong et al, ; Yang et al, ; Figure e). In the regional context, all three units of the Qilian Orogeny (i.e., the northern, central, and southern portions) display evidence of post‐collisional intrusions of granite during the Late Silurian–Late Devonian (Wu, Yao, et al, ; Xiong et al, ; Zuo & Wu, ).…”

Section: Discussionmentioning

confidence: 99%

Detrital zircon record of rivers' sediments in the North Qilian Orogenic Belt: Implications of the tectonic evolution of the northeastern Tibetan Plateau

Kang

Chen

et al. 2018

Geological Journal

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The North Qilian Orogenic Belt (NQOB) is an important element of the northern edge of the Tibetan Plateau, and several rivers run along it. Zircon U–Pb dating, trace elements, and Hf isotopic data derived from the sediments carried by the rivers have been used to deduce the crustal evolution of the NQOB. U–Pb ages obtained from detrital zircons found in the sediments of the Zamu, Zhuanglan, and Beida rivers can be divided into five major age groups, that is, 2,600–1,500, 1,500–1,100, 1,100–650, 550–400, and 360–150 Ma, and the corresponding peaks occur at ~2,450, ~1,750, ~950, ~450, and ~250 Ma. Archean components, which may be derived from the ancient continental nucleus in the region, are rare in the river sediments. The zircon grains with ages of 360–150 Ma are most likely related to crustal thickening and decompression melting in a post‐collisional tectonic setting. The age distribution patterns indicate that the sediments carried by the Zamu, Zhuanglang, and Beida rivers are derived from the NQOB. Furthermore, the Hf isotopic compositions of Meso‐ and Neoarchean, Mesoproterozoic, Grenvillian, Pan‐African, Caledonian, and Hercynian zircon age groups exhibit a wide range of εHf (t) values, suggesting diverse sources. The existence of strongly negative εHf (t) values among the Grenvillian and Paleoproterozoic zircons indicates that the source magma included reworked Palaeoarchean crustal materials. New results indicate that continental rifting and the opening of the Qilian Ocean occurred at 775–520 Ma; the subduction and closure of the Qilian Ocean occurred at 520–440 Ma; arc–continent collision and continental subduction occurred at 440–420 Ma; and orogen collapse and extension occurred at 400–360 Ma. Our study indicates that the formation of the NQOB was mainly related to the evolutionary history of the Proto‐Tethys Ocean.

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Generation of peraluminous granitic magma in a post-collisional setting: A case study from the eastern Qilian orogen, NE Tibetan Plateau

Cited by 69 publications

References 93 publications

Geochronology and petrogenesis of Neoproterozoic S‐type granites from the Qilian Block, north‐west China, and their geological implications

Geochronology and petrogenesis of Neoproterozoic S‐type granites from the Qilian Block, north‐west China, and their geological implications

Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Detrital zircon record of rivers' sediments in the North Qilian Orogenic Belt: Implications of the tectonic evolution of the northeastern Tibetan Plateau

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