Ophiolite belts and evolution of the Proto-Tethys Ocean in the Qilian Orogen

Song, Shuguang; Wu, Zhenzhu; Yang, Liming; Su, Li; Xia, Xiaohong; Wang, Chao; Dong, Jinlong; Zhou, Chen-Ao; Bi, Haiyun

doi:10.18654/1000-0569/2019.10.02

Cited by 43 publications

(10 citation statements)

References 69 publications

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“…Based on previous studies of the North Qilian orogenic belt, we collected the ages of the ophiolites in Yushigou and adjacent areas, which can be divided into three major stages according to their formation time. The first stage occurred at ~550 Ma, and its lithology was mainly composed of gabbro (566-516 Ma), Frontiers in Earth Science frontiersin.org volcanic rock (593 Ma), amphibolite (534 Ma), and a subduction complex (545 Ma) (Xia et al, 1995;Shi et al, 2004;Song et al, 2019;Yan et al, 2019). The second stage was from 520 to 490 Ma; the lithology of this stage was mainly volcanic rock (495 Ma), gabbro (513-490 Ma), and ophiolites (504-495 Ma) (Xia et al, 1995;Xiang et al, 2007;Zeng et al, 2007;Xia and Song, 2010;Song et al, 2019).…”

Section: Discussion Formation Agementioning

confidence: 99%

“…The first stage occurred at ~550 Ma, and its lithology was mainly composed of gabbro (566-516 Ma), Frontiers in Earth Science frontiersin.org volcanic rock (593 Ma), amphibolite (534 Ma), and a subduction complex (545 Ma) (Xia et al, 1995;Shi et al, 2004;Song et al, 2019;Yan et al, 2019). The second stage was from 520 to 490 Ma; the lithology of this stage was mainly volcanic rock (495 Ma), gabbro (513-490 Ma), and ophiolites (504-495 Ma) (Xia et al, 1995;Xiang et al, 2007;Zeng et al, 2007;Xia and Song, 2010;Song et al, 2019). The third stage occurred at ~450 Ma, and its main lithology was gabbro (479-448 Ma) (Song et al, 2007;2013a).…”

Section: Discussion Formation Agementioning

confidence: 99%

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Development of a cambrian back-arc basin in the North Qilian orogenic belt: New constraints from gabbros in Yushigou ophiolite

Tian

Liu

et al. 2023

Front. Earth Sci.

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Introduction: The North Qilian orogenic belt, as the Northern branch of the original Tethys tectonic domain, is important for reconstructing the tectonic evolution of the ancient Tethys. However, the tectonic history of the North Qilian orogenic belt remains controversial. This study addresses this issue from a geochemical perspective.Methods: In this study, a comprehensive analysis of the geochronology, whole-rock geochemistry, clinopyroxene mineral geochemistry, zircon Ti crystallization temperature, and gabbromagma temperature and pressure in the Yushigou ophiolite of the North Qilian orogenic belt was conducted to provide constraints on its tectonic evolution.Results and Discussion: Laser ablation inductively coupled plasma mass spectrometry zircon U-Pb dating results reveal that the gabbros have ages of 519 ± 3 Ma and 495 ± 4 Ma, belonging to the Cambrian period. Most of the studied gabbros exhibited geochemical characteristics of tholeiitic basaltic rocks with normal mid-ocean ridge basalt and island arc tholeiite dual geochemical affinities. The gabbros are interpreted to have formed by a high degree of partial melting of the depleted mantle spinel lherzolite. These results suggest that the back-arc basin of the North Qilian tectonic belt may have evolved to a relatively mature stage from 519 to 495 Ma. Overall, this study contributes to our understanding of the tectonic evolution of the North Qilian orogenic belt through geochemical analyses.

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Section: Discussion Formation Agementioning

confidence: 99%

Section: Discussion Formation Agementioning

confidence: 99%

Development of a cambrian back-arc basin in the North Qilian orogenic belt: New constraints from gabbros in Yushigou ophiolite

Tian

Liu

et al. 2023

Front. Earth Sci.

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“…1978; Song et al . 2019) indicate the existence of open oceans or back‐arc basins (Coleman 1977). This means that these presently adjacent terranes and areas may has been far apart from each other during the Ordovician, with different faunas, and are yet to be well understood.…”

Section: Figmentioning

confidence: 99%

Katian (Late Ordovician) trilobites of the North Qilian Mountains and their palaeogeographical implications for the Proto‐Tethys Archipelagic Ocean

Wei,

Luan,

Zhang

et al. 2023

Papers in Palaeontology

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Trilobites from the middle Koumenzi Formation (Katian, Upper Ordovician) of the North Qilian Mountains, Menyuan, northeastern Qinghai Province are systematically documented for the first time. The fauna consists of five families, seven genera and seven species, one of which is new (Remopleurides zhangi), showing a close relationship to those of the Kazakh terranes (such as the Chu‐Ili terrane, Chingiz‐Tarbagatai area and the Karatau‐Naryn and North‐Tien Shan microcontinents), and the North China and Laurentia palaeoplates during the Katian (Late Ordovician). The cluster and non‐metric multidimensional scaling analyses of the Middle–Late Ordovician (late Darriwilian–Katian) trilobite faunas with 299 genera or subgenera from 46 horizons of 37 areas, provide valuable information for the palaeogeographical reconstruction of the Proto‐Tethys Archipelagic Ocean (PTAO) of this interval. The Qilian terrane and adjacent areas are essential components of the PTAO, some of which include the Qilian terrane, the North Qilian Mountains area, the Altun faulted terrane, the Hexi Corridor area and the East Qinling terrane. Their relative positions in the PTAO are inferred by the palaeobiogeography of trilobite faunas. Furthermore, based on discussions of the spatiotemporal distribution of those faunas, the Pliomerina and/or Sinocybele Province of the Middle–Late Ordovician (late Darriwilian–Katian) age is defined as a trilobite faunal province of the PTAO. Moreover, a distinct faunal subprovince, essentially comprising the South China Palaeoplate and its neighbours (e.g. Tarim, Annamia, Sibuma, East Qinling, Turkestan‐Alai and probably Talesh), might be surrounded by the equatorial cold‐water tongue.

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“…Petrological and geochemical studies indicate that this assemblage formed in an extensional back-arc basin, and represents a subduction-related SSZ-type ophiolite ( Qian et al 2001;Xia and Song 2010). Zircon U-Pb geochronological analysis indicates that the back-arc ophiolite formed during 490-448 Ma (Song et al 2007(Song et al , 2019Xia and Song 2010), and back-arc extension occurred over a period of at least 40 Myr. At ca.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Development of the island arc and back-arc extension occurred during 520-448 Ma, forming the back-arc basin on the northern slope of the Zoulang-Nanshan. Closure of the North Qilian Ocean in the west of the northern margin of the Proto-Tethys Ocean and continental subduction occurred at 445-424 Ma, coeval with the closure of the northern slope of the Zoulang-Nanshan back-arc basin (Xia et al 1998(Xia et al , 2016Song et al 2007Song et al , 2019Xia and Song 2010;Guo et al 2020).…”

Section: Geological Backgroundmentioning

confidence: 99%

Subduction characteristics of the ordovician erlangping back-arc basin in the east qinling mountains, china: implications for the tectonic evolution of the northern margin of the proto-tethys ocean

Ren

Dong

et al. 2021

International Geology Review

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Ophiolite belts and evolution of the Proto-Tethys Ocean in the Qilian Orogen

Cited by 43 publications

References 69 publications

Development of a cambrian back-arc basin in the North Qilian orogenic belt: New constraints from gabbros in Yushigou ophiolite

Development of a cambrian back-arc basin in the North Qilian orogenic belt: New constraints from gabbros in Yushigou ophiolite

Katian (Late Ordovician) trilobites of the North Qilian Mountains and their palaeogeographical implications for the Proto‐Tethys Archipelagic Ocean

Subduction characteristics of the ordovician erlangping back-arc basin in the east qinling mountains, china: implications for the tectonic evolution of the northern margin of the proto-tethys ocean

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