EMP chemical ages of monazites from Central Zone of the eastern Kunlun Orogen: Records of multi-tectonometamorphic events

Chen, Nengsong; Sun, Min; Wang, QingYan; Zhao, Guochun; Chen, Qiang; Shu, Guiming

doi:10.1007/s11434-007-0299-5

Cited by 67 publications

(36 citation statements)

References 46 publications

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“…460 Ma) of the granulite-facies metamorphism in southern margin of the Qaidam Block [16] or to the age (ca. 450 Ma) of the metamorphism for the closing of the arc basin [12] , and will be interpreted as the upper most limited age for the second metamorphic episode. Therefore, dating of the zircons from the orthogneisses and the amphibolite probably recorded the late Neoproterozoic (≥550 Ma) magmatic event and ca.…”

Section: Early and Pre-cambrian Magmatic-metamorphic Eventsmentioning

confidence: 99%

“…Subduction of the Proto-Tethys [9] oceanic crust caused low-pressure amphibolite-granulite facies arc metamorphism in the south margin of the North Zone (Qaidam Block) [16] , followed by collision of the Central Zone with the North Zone and resulting in medium-pressure amphibolite facies metamorphism [12,17] . The oceanic subduction and continent-continent collision led to intrusion of arc-and collision-types of granitoid [19] .…”

Section: Tectonic Evolutionmentioning

confidence: 99%

“…[12]). 1, Quaternary; 2, Neogene Guide Group; 3, Late Triassic Er'Lashan volcanic Formation; 4, Triassic Bayan Har Group; 5, Late Permian to Early Triassic clastic sediments including Gequ Formation, Hongshuichuan Group and Naochangjianguo Formation; 6, Permian-Triassic Maerzheng Formation of Buqingshan Group; 7, Early to Middle Permian Shuweimenke Formation; 8, Carboniferous Halagole Formation and Haotelowa Formation; 9, Devonian Maoniushan Formation; 10, late Neoproterozoic to early Paleozoic Wanbaoguo-Nachitai Group in the north and Longshigenggongwu Group in the south; 11, Neoproterozoic-early Paleozoic metamorphic unit of the Central Zone; 12, the Baishahe Formation of the Jinshuikou Group of the North Zone; 13, Precambrian complex of the Middle and the South Zones; 14, late Mesozoic granitoid; 15, Paleozoic-early Mesozoic granitoid; 16, fault; 17, nappe; 18, shear zone; 19, boundaries between tectonic units and/or zones; 20, sample localities.…”

mentioning

confidence: 99%

“…The Central Zone is a tectonic complex mainly composed of Precambrian and early Paoleozoic slabs. Closing and consumption of the Proto-Tethys in the Ordovician-Silurian caused low-pressure amphibolite-granulite facies metamorphism in the North Zone [16] , followed by medium-pressure epidotite-amphibolite facies metamorphism in the Nachitai Group [17] (Figure 1(b)) and Medium-Pressure metamorphism [12] and magmatism [18,19] in the Central Zone. The South Zone is composed of tectonic slabs of dominant late Paleozoic sedimentary rocks with minor Precambrian rocks.…”

mentioning

confidence: 99%

“…Consumption of the Paleo-Tethys led to both intrusions of Indosinian granitoid batholith in the North and the Central Zones and metamorphic overprint on some of the slabs in the Central Zone [12] .…”

mentioning

confidence: 99%

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U-Pb dating of zircon from the Central Zone of the East Kunlun Orogen and its implications for tectonic evolution

Chen

Sun

Wang

et al. 2008

Sci. China Ser. D-Earth Sci.

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LA-ICP-MS and SHRIMP U-Pb dating of zircons from orthogneisses and amphibolite from the CentralZone of the Kunlun Orogen is reported in this paper. One orthogneiss sample has metamorphic zircons yielding weighted average 206 Pb/ 238 U age of 517.0 +5.0/−6.0 Ma, and the other orthogneiss sample contains zircons with inherited magmatic cores giving three population 207 Pb/ 206 Pb ages of 955 Ma, 895 Ma and 657 Ma for the magmatic protolith, and metamorphic recrystallized rims with peak 206 Pb/ 238 U ages of 559 +12/−17 Ma and 516 ± 13 Ma. The amphibolite yielded three populations of weighted average 206 Pb/ 238 U age of 482.0 +10/−8.0 Ma, 516.2 ± 5.8 Ma and 549 ± 10 Ma for the metamorphic zircons. These dating results recorded the tectonothermal events that occurred in the early Paleozoic and the Precambrian time. The records of the Cambrian magmatic-metamorphic event in the Qinling Orogen, the Altyn Tagh belt, north margin of the Qaidam Block and the Kunlun Orogen suggest that continental assembly probably occurred in the early evolutionary history of the Proto-Tethys.

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Section: Early and Pre-cambrian Magmatic-metamorphic Eventsmentioning

confidence: 99%

Section: Tectonic Evolutionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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U-Pb dating of zircon from the Central Zone of the East Kunlun Orogen and its implications for tectonic evolution

Chen

Sun

Wang

et al. 2008

Sci. China Ser. D-Earth Sci.

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Early Paleozoic Tarim Orocline: Insights from paleogeography and tectonic evolution in the Tarim Basin

Wang

Zhao

et al. 2017

Geological Journal

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The Tarim Basin, situated between the Paleo‐Asian tectonic domain and the Proto‐Tethys tectonic domain, has undergone a complex tectonic evolutionary process under various geodynamic conditions and has provided abundant information about the dynamic evolution of the peripheral orogens. From the Sinian to Early Ordovician, the Tarim–Qaidam Block was under a regional extensional setting. A carbonate platform developed widely in the basin, flanked by a passive continental margin setting. As the extension enhanced, the spreading of the Proto‐Tethys Ocean was accompanied by subduction and collision, which resulted in a nearly linear subduction zone. Since the Late Cambrian, a continuous oblique subduction and induced sinistral shearing produced an initial bending of the Proto‐Tethys subduction zone, leading to rotation and bend of the original Tarim–Qaidam Block and internal long striped subaqueous paleo‐uplift. During the Middle and Late Ordovician, the Altyn–Qilian Orogen underwent continent–continent collision and continental crust deep subduction. The buckling of the subduction system enhanced under the sinistral transpressional field, resulted in the bending of the Altyn–Qilian Orogen to an S‐shape. The subaqueous uplift areas in the basin were further elevated, rotated, and eroded to show an S‐shape distribution and an unconformity developed between the Silurian sediments and underlying strata. The extent of the carbonate platform decreased, around which developed a high‐energy facies in a platform margin and formed important oil–gas reservoirs. In the Silurian to Middle Devonian, the Tarim Basin evolved into a “two uplifts with a depression” framework under the dual‐directional compressional field. Near the end of the Late Devonian, the S‐shape distribution pattern of paleo‐uplifts was covered by the Upper Devonian and Carboniferous sequence in an angular unconformity. Moreover, the planar distribution of thrust faults with strike‐slip property around the paleo‐uplifts also showed an S‐shape. Accompanying small‐scale strike‐slip faults presented as the radial axial cleavages of plunging vertical folds around a vertical hinge, which indicated that the pre‐existing thrust faults bent around a vertical axis resulting from late strike‐slip faults, demonstrating a coupling between the Tarim Basin and orocline of the Early Paleozoic orogens in the Proto‐Tethys Ocean, called the Tarim Orocline.

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A newly discovered Early Paleozoic ophiolite in Dagele, Eastern Kunlun, China, and its geological significance

Jiang

Xia

et al. 2017

Geological Journal

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This study reports the discovery of an ophiolite located in the Eastern Kunlun Orogen (Dagele, Eastern Kunlun, China) that is mainly composed of isotropic and serpentinized dunite, gabbro, and eclogites. According to the geochemical results, the ophiolite unit is characterized by the depletion of Nb, Ta, and Ti and a slight enrichment in large‐ion lithophile elements, which suggests that the Dagele ophiolite was formed in an island arc environment. To constrain the time of formation of the ophiolite, gabbro samples were selected for sensitive high‐resolution ion microprobe U–Pb zircon dating and yielded an age of 445 ± 4.8 Ma. By integrating the regional geological and geochronological data, we propose that the Dagele ophiolite is a suprasubduction zone‐type. Further studies on this and other ophiolites in the region will provide crucial constraints on the evolution of the Eastern Kunlun Orogen as well as the Proto‐Tethys Ocean in central western China.

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EMP chemical ages of monazites from Central Zone of the eastern Kunlun Orogen: Records of multi-tectonometamorphic events

Cited by 67 publications

References 46 publications

U-Pb dating of zircon from the Central Zone of the East Kunlun Orogen and its implications for tectonic evolution

U-Pb dating of zircon from the Central Zone of the East Kunlun Orogen and its implications for tectonic evolution

Early Paleozoic Tarim Orocline: Insights from paleogeography and tectonic evolution in the Tarim Basin

A newly discovered Early Paleozoic ophiolite in Dagele, Eastern Kunlun, China, and its geological significance

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