Magma sources and petrogenesis of the early–middle Paleozoic backarc granitoids from the central part of the Qilian block, NW China

Tung, Kuo An; Yang, Haw‐Ching; Yang, Huai Jen; Smith, A. D.; Liu, Dunyi; Zhang, Jianxin; Wu, Cailai; Shau, Yen Hong; Wen, Da Jen; Tseng, Chin Chung

doi:10.1016/j.gr.2015.11.012

Cited by 53 publications

(44 citation statements)

References 38 publications

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“…Ordovician detrital zircon populations (ca. 480–440 Ma) that correspond with the ages of granitoid clasts were almost certainly derived from the Ayishan arc, whereas coeval I‐ and S‐type granitoid intrusions in the Central Qilian block and Hualong complex (Tung et al, ; Yan et al, ) also contributed voluminous ca. 450–440 Ma detrital zircon populations.…”

Section: Discussionmentioning

confidence: 89%

“…As this complex collided with the Central Qilian block subduction polarity flipped in a manner similar to that observed in the presently active arc‐continent collision system of Taiwan. A north‐facing subduction system and associated Andean‐type arc began to develop along the southern of the central Qilian block between 470–450 Ma (Gehrels et al, ; Tung et al, ; Yan et al, ). Voluminous dacite, rhyolite, and the associated volcaniclastic rocks in the Ayishan area nonconformably overlie the Cambrian arc‐ophiolite and accretionary complexes.…”

Section: Discussionmentioning

confidence: 99%

“…Igneous arc activity took place in the Central Qilian belt from ca. 520–440 Ma (Gehrels et al, 2003; Yong et al, ; Song et al, ; Tung et al, ; Wu et al, ). The trend of magmatic termination ages becomes younger in a southward direction (Wu et al, ) as result of northward subduction of the Proto‐Tethyan Ocean.…”

Section: Discussionmentioning

confidence: 99%

“…The 1,000 by 80 km wide Central Qilian belt is separated from the North and South Qilian belts by SW‐verging thrust faults. It is dominated by highly deformed, lower greenschist to amphibolite‐facies Precambrian metamorphic rocks (Guo & Li, ; Liu et al, ; Tung et al, ; Wan et al, ) that have been intruded by Ordovician to Silurian I‐ and S‐type granitoids (Tung et al, ). Rocks within a 240 x 80 km zone near Huangyuan County were originally assigned to the Neoproterozoic Huangyuan and Huashishan groups (BGMRQP, ).…”

Section: Geological Settingmentioning

confidence: 99%

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Retro‐foreland Basin Development in Response to Proto‐Tethyan Ocean Closure, NE Tibet Plateau

Yan

Aitchison

et al. 2019

Tectonics

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The compositions and ages of the sediments within retro or foreland basins that are formed and preserved adjacent to collisional orogens can reflect the nature of colliding tectonic elements. The nonmarine Yaoshuiquan and Huabaoshan formations in the South Qilian belt on the NE Tibetan Plateau deposited within a retro-foreland basin setting during latest Ordovician to Late Silurian time in response to arc-continent collision. Detritus derivation from a Cambro-Ordovician arc-ophiolite complex contains mixed 530-480 Ma oceanic-crust together with contributions from a 479-450 Ma continental-arc early in development of the basin. The Cambrian arc-accretionary system and Central Qilian block united to form the basement of a continental arc at~450 Ma, and both then contributed sediments to the Lianhuashan-Huabaoshan basin. After the Hualong complex accreted to the north, a broad Andean-type margin developed along the southern margin of the Central Qilian block from 450 to 440 Ma. These processes generated a wider basin that received detritus from both the south and the north. Consumption of the Proto-Tethyan Ocean ended with collision between the Qaidam and Hualong blocks, which led to mass wasting of detritus from the Andean-type igneous rocks and both blocks with the basin from 440 to 420 Ma.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Retro‐foreland Basin Development in Response to Proto‐Tethyan Ocean Closure, NE Tibet Plateau

Yan

Aitchison

et al. 2019

Tectonics

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“…The Qilian Orogenic Belt (QOB), located at the north‐eastern margin of the Qinghai–Tibet Plateau (Figure a), is key to understanding the tectonic evolution of the Central China Orogenic Belt. The QOB (Figure ) records a long history of continental break‐up, seafloor spreading, and final continental collision from the Neoproterozoic to the Palaeozoic (Li, Jahn, et al, ; Li, Zhao, et al, ; Song, Niu, Su, & Xia, ; Song, Niu, Su, Zhang, & Zhang, ; Song, Niu, Zhang, & Zhang, ; Tung et al, ; Wang et al, ; Xiao et al, ; Yang et al, ; Yu et al, ). Based on tectonics (Song et al, ; Song et al, ; Song et al, ), the QOB is divided into the following: (1) North Qilian Orogenic Belt (NQOB), (2) Qilian Block (QB), and (3) North Qaidam Ultrahigh‐Pressure Metamorphic Belt (NQ‐UHPMB; Figure b).…”

Section: Introductionmentioning

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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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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Petrogenesis and tectonic implications from the Ayishan Group in the South Qilian Belt, NW China

Sun

Niu

et al. 2020

Geological Journal

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The Ayishan Group in the Lajishan area is sandwiched between the South Qilian Belt and the Qilian Block, which is transitionally interpreted to represent the products of the post-collision setting or the continental marginal arc during the Early Ordovician or Silurian and is associated with the evolution of the Proto-Tethyan Ocean. While the detailed information about the age, geochemistry, and tectonic setting of the Ayishan Group is lacking, our geological mapping and analyses demonstrates that the Ayishan Group consists of andesites, rhyolites, ignimbrites, sandstones, and conglomerates, which unconformably overlies the Cambrian-Ordovician arc-ophiolite complex. Zircon U-Pb dating of the rhyolites demonstrated that the Ayishan Group formed between 447 and 442 Ma and is Late Ordovician. Geochemical analyses demonstrated that rhyolites have high and variable SiO 2 contents of 69.6-76.5 wt % and an aluminium saturation index (A/CNK) of 0.85-1.45, belonging to calcalkaline to high K calc-alkaline series. They are subdivided into two subtypes of high-Sr/Y rhyolites (HSRs) and normal rhyolites (NRs) based on the geochemical characteristics. The HSRs show lower total rare earth elements (34.77-62.78 ppm), lower Yb (0.19-0.21 ppm) and Y (1.77-1.99 ppm) contents, and relatively higher Sr contents (159-193 ppm), compared with NRs, and with positive Eu anomalies. Both subtypes exhibit extremely high whole-rock δ 18 O values of 12.63-13.21‰, but various initial 87 Sr/ 86 Sr ratios and ε Nd (t) values, indicating a dominant origin of terrigenous sediments and the HSRs exhibit a more terrestrial composition than the NRs. Various magma sources further caused the assorted residual phase leading to the different geochemistry between the HSRs and the NRs. Combined with the previous data, these results imply that the rhyolites of the Ayishan Group were produced in the process of the amalgamation of the Qilian Block with the Qaidam Block during the Late Ordovician, which further indicated that the Proto-Tethyan Ocean closed 450 Ma ago.

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Magma sources and petrogenesis of the early–middle Paleozoic backarc granitoids from the central part of the Qilian block, NW China

Cited by 53 publications

References 38 publications

Retro‐foreland Basin Development in Response to Proto‐Tethyan Ocean Closure, NE Tibet Plateau

Retro‐foreland Basin Development in Response to Proto‐Tethyan Ocean Closure, NE Tibet Plateau

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

Petrogenesis and tectonic implications from the Ayishan Group in the South Qilian Belt, NW China

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