Zircon U-Pb ages and Hf isotopic compositions of fluvial sediments from the Huangshui, Beichuan, and Xichuan rivers, Northwest China: Constraints on the formation and evolution history of the Central Qilian Block

Kang, Huan; Chen, Yuelong; Li, Dapeng; Bao, Chuang; Zhang, Huazhen

doi:10.2343/geochemj.2.0495

Cited by 11 publications

(8 citation statements)

References 49 publications

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“…Based on the study of river sediments, we find that the age groups and age spans in the CQB are similar to those in the NQOB (Kang et al, 2018;Li et al, 2016). This evidence suggests that the opening of the ocean and the existence of the oceanic plateau were contemporaneous.…”

Section: Tectonic Synthesissupporting

confidence: 60%

“…Li, Li, et al () also proposed that the Qilian Ocean is part of the Proto‐Tethys Ocean during the Early Paleozoic. Given the results from river sediments (Kang, Chen, Li, Bao, & Zhang, ) and Lajishan plume‐type ophiolite (Zhang et al, ) found within the CQB, the CQB is considered to have been a palaeo‐oceanic plateau. Based on the study of river sediments, we find that the age groups and age spans in the CQB are similar to those in the NQOB (Kang et al, ; Li et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Given the results from river sediments (Kang, Chen, Li, Bao, & Zhang, ) and Lajishan plume‐type ophiolite (Zhang et al, ) found within the CQB, the CQB is considered to have been a palaeo‐oceanic plateau. Based on the study of river sediments, we find that the age groups and age spans in the CQB are similar to those in the NQOB (Kang et al, ; Li et al, ). This evidence suggests that the opening of the ocean and the existence of the oceanic plateau were contemporaneous.…”

Section: Discussionmentioning

confidence: 99%

“…also proposed that the Qilian Ocean is part of the Proto-Tethys Ocean during the Early Paleozoic. Given the results from river sediments (Kang, Chen, Li, Bao, & Zhang, 2018) and…”

Section: Tectonic Synthesismentioning

confidence: 99%

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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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Section: Tectonic Synthesissupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…also proposed that the Qilian Ocean is part of the Proto-Tethys Ocean during the Early Paleozoic. Given the results from river sediments (Kang, Chen, Li, Bao, & Zhang, 2018) and…”

Section: Tectonic Synthesismentioning

confidence: 99%

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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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“…Some authors consider that the CQB is a Precambrian metamorphic terrain, and the SQOB and CQB represent a unified microcontinent, which is named as the “Qilian block” (Feng & He, ; Huang et al, ; S. G. Song, Niu, Zhang, & Zhang, ; Xia et al, ). However, H. Kang, Chen, Li, Bao, and Zhang () demonstrated that the CQB is a paleo‐oceanic plateau, based on U–Pb ages and Hf isotopic compositions of detrital zircons from fluvial sediments in the CQB display similar characteristics with those of the NQOB (Figure ) and Lajishan‐Yongjing Cambrian plume‐type ophiolite is exposed in the Lajishan area (Y. Q. Zhang, Song, et al, ). Detrital zircon geochronology results of sediments from the CQB and NQOB rivers show that the ocean opened and the oceanic plateau coexisted simultaneously (Z. Li et al, ).…”

Section: Geological Settingmentioning

confidence: 98%

The nature and history of the South Qilian orogenic belt: Constraints from compositions of rivers' sediments and their detrital zircon U–Pb geochronology, Lu‐Hf isotopic compositions

Kang

Chen

2019

Geological Journal

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Detrital zircon U-Pb dating, Hf isotopic data, and Nd isotopic compositions of river sediments are used to constrain crustal evolution processes of their provenance in the South Qilian orogenic belt. The detrital zircons from the Yuka, Tataleng, and Bayinguole rivers range in age from Neoarchean (2,772 Ma) to Permian (261 Ma), with age peaks at ca. 2.4 Ga, ca. 1.95 Ga, and ca. 0.45 Ga. Hf isotopic compositions of Paleoproterozoic, Pan-African, and Caledonian zircon age groups display a wide range of ε Hf (t) values, suggesting diverse sources of host magma of the zircon grains. The basement formation of the South Qilian orogenic belt from depleted mantle occurred at two stages; ca. 3.1-2.5 Ga and ca. 2.0-1.6 Ga. Meanwhile, the Nd model ages of silt-mud from the region are between 1.98 Ga and 2.27 Ga with an average value of 2.12 Ga. Our study indicates that the Qilian oceanic plate formed between the Qaidam and Alxa blocks from late Neoproterozoic to Silurian. The South Qilian orogenic belt is a product of the Qilian Ocean closure and subsequent collision between the Qaidam Block and central Qilian belt during Ordovician-Silurian times. Combining regional tectonothermal events with new results of river sediments suggests that rifting from a continent and opening of the Qilian Ocean occurred at ca. 780-520 Ma, subduction of the oceanic crust at ca. 520-440 Ma, ocean closure and continental subduction at ca. 440-420 Ma, exhumation of subducted crust at ca. 420-400 Ma, and orogenic collapse and extension at ca. 400-360 Ma. KEYWORDS detrital zircon, formation and evolution of crust, Nd isotope, Qilian oceanic plate, South Qilian orogenic belt, U-Pb-Hf isotopes

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Risk assessment of geological disasters in Beichuan County after the Wenchuan earthquake based on ArcGIS

Xu,

Ou,

Wang

et al. 2023

Bull Eng Geol Environ

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Zircon U-Pb ages and Hf isotopic compositions of fluvial sediments from the Huangshui, Beichuan, and Xichuan rivers, Northwest China: Constraints on the formation and evolution history of the Central Qilian Block

Cited by 11 publications

References 49 publications

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

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

The nature and history of the South Qilian orogenic belt: Constraints from compositions of rivers' sediments and their detrital zircon U–Pb geochronology, Lu‐Hf isotopic compositions

Risk assessment of geological disasters in Beichuan County after the Wenchuan earthquake based on ArcGIS

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