From Subduction to Collision in the Northern Tibetan Plateau: Evidence from the Early Silurian Clastic Rocks, Northwestern China

Yang, Jianghai; Du, Yu; Cawood, Peter A.; Xu, Yajun

doi:10.1086/662717

Cited by 26 publications

(18 citation statements)

References 77 publications

(119 reference statements)

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“…Geological and tectonic map of the Qilian Orogen. Inset map (a) shows the location of the Qilian Orogen in Tibet, modified from Yang, Du, Cawood, and Xu (). Zircon U–Pb ages for Neoproterozoic magmatic rocks are indicated in (b) [Colour figure can be viewed at wileyonlinelibrary.com]…”

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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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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“…Locally, there may be some influence from the westward subduction of the Paleo‐Pacific slab. The Qilian Orogen, located in the west of the NCC, is a result of Paleozoic collision between the Qaidam Block in the south and the NCC in the north [ Yang et al , ], which had a complex tectonic evolution with six stages summarized by Song et al [] from continental breakup of the Rodinia supercontinent in the Neoproterozoic to continental collision in the Paleozoic. The tectonic setting is presented in Figure a.…”

Section: Introductionmentioning

confidence: 99%

Mid‐lithosphere discontinuities beneath the western and central North China Craton

Sun

Kennett

2017

Geophysical Research Letters

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By analyzing P reflectivity extracted from stacked autocorrelograms for teleseismic events on a dense seismic profile, we obtain a detailed image of the mid‐lithosphere discontinuity (MLD) beneath western and central North China Craton (NCC). This seismic daylight imaging exploits a broad high‐frequency band (0.5–4 Hz) to reveal the fine‐scale component of multi‐scale lithospheric heterogeneity. The depth of the MLD beneath the western and central parts of the NCC ranges 80–120 km, with a good match to the transition to negative S velocity gradient with depth from Rayleigh wave tomography. The MLD inferred from seismic daylight imaging also has good correspondence with the transition from conductive to convective regimes estimated from heat flow data indicating likely thermal control within the seismological lithosphere.

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“…These ages provide new information that can be used to reconstruct the tectonic evolution of the NQOB, which is related to the breakup of a continent and the opening of an ocean. Together with records from igneous rocks and previous tectonic reconstructions (Gong et al, 2017;Song, Niu, Su, Zhang et al, 2013;Song, Niu, Su, & Xia, 2013;Xia, Xia, & Xu, 2003;Xiao et al, 2009;Xu et al, 2010;Yang, Du, Cawood, & Xu, 2012), the history linking the opening of the Qilian Ocean basin to the collision between the Alxa and Qaidam blocks can be shown as follows (Figure 8).…”

Section: Tectonic Synthesismentioning

confidence: 88%

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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From Subduction to Collision in the Northern Tibetan Plateau: Evidence from the Early Silurian Clastic Rocks, Northwestern China

Cited by 26 publications

References 77 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

Mid‐lithosphere discontinuities beneath the western and central North China Craton

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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