New Paleomagnetic Results From Middle Jurassic Limestones of the Qiangtang Terrane, Tibet: Constraints on the Evolution of the Bangong‐Nujiang Ocean

Cao, Yongluo; Sun, Zhilei; Li, Haibing; Pei, Junling; Liu, Dongliang; Zhang, Lei; Ye, Xiaozhou; Zheng, Yong; He, Xinguang; Ge, Chenglong

doi:10.1029/2017tc004842

Cited by 48 publications

(40 citation statements)

References 62 publications

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“…This is inferred by paleomagnetic results, which indicate that the difference in paleolatitude between the Lhasa and Qiangtang Terranes during 180-170 Ma is 20°-23°(Y. Ma, Yang, et al, 2018;Cao et al, 2019). In fact, the timing of Lhasa-Qiangtang collision has been investigated by a growing body of literature, and a favored time for collision of around 125-105 Ma has often been suggested (S.M.…”

Section: 1029/2019tc005951mentioning

confidence: 99%

Reconciling Orogenic Drivers for the Evolution of the Bangong‐Nujiang Tethys During Middle‐Late Jurassic

Wang

Zhu

et al. 2020

Tectonics

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Identifying arc-trench systems along with spatial and temporal variations in their record of tectono-magmatic events is crucial for determining the orogenic divers and evolution of orogenic systems. New geochronological and geochemical data of Jurassic igneous rocks, as well as detrital zircon data from contemporaneous sedimentary units, within the eastern Bangong-Nujiang suture in central Tibet indicate the existence of an approximately 1,200-km Middle-Late Jurassic magmatic arc system. This arc system can be divided into two distinct along-strike segments, which are characterized by magmatic activity extending from 166 to 160 Ma in the east and 170-148 Ma in the west, followed by magmatic gaps at 160-120 and 148-125 Ma, respectively. An accretionary prism, magmatic arc, and retro-arc sedimentary units are identified from south to north in the eastern segment. The 166-160 Ma arc includes high-K calc-alkaline granitoids, and high-Mg andesites, dacites, and rhyolites, which collectively can be interpreted to originate from partial melting of ancient lower crust and mélange diapirs above a north dipping subduction zone. Our analysis reveals the existence of an overall compressional arc-trench system along strike, which overlaps with a phase of 170-160 Ma ophiolite generation and a rock association of 160-148 Ma slab-derived adakites and oceanic island basalt-type rocks, and is followed by an overall magmatic gap during 148-125 Ma with subsequent 125-105 Ma extensive magmatism. We infer that these records may reflect sequential tectonic events, including subparallel ridge-trench collision (170-160 Ma), slab window formation (160-148 Ma), subsequent subduction termination (148-125 Ma), and final Lhasa-Qiangtang amalgamation (125-105 Ma).

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Section: 1029/2019tc005951mentioning

confidence: 99%

Reconciling Orogenic Drivers for the Evolution of the Bangong‐Nujiang Tethys During Middle‐Late Jurassic

Wang

Zhu

et al. 2020

Tectonics

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“…The northern Qiangtang block in Central Tibet is one of these Cimmerian terranes and therefore is an important area to study the demise of the Paleo-Tethys Ocean. Paleomagnetism can provide quantitative estimates of latitude with time, from which minimum convergence rates can be calculated and which can provide unique kinematic information for reconstructing the tectonic evolution of the Tibetan Plateau (e.g., Bian et al, 2019;Cao et al, 2019;Huang et al, 2015;Huang et al, 2018;Li et al, 2018;Li et al, 2016;Lippert et al, 2014;Ma et al, 2019;Tong et al, 2017;Yan et al, 2016;Yan et al, 2018;Yang et al, 2015;Zhou et al, 2016). Paleomagnetic data from Paleozoic and Mesozoic rocks from the northern Qiangtang block are rare, but a recent paleomagnetic study of the Late Triassic basaltic lavas of the northern Qiangtang block suggests that the final suturing of the Paleo-Tethys Ocean was complete prior to Late Triassic time (204-213 Ma) (Song et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetism of Middle Triassic Lavas From Northern Qiangtang (Tibet): Constraints on the Closure of the Paleo‐Tethys Ocean

et al. 2020

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We present results from a paleomagnetic study of Middle Triassic lavas (~242–240 Ma) from the northern Qiangtang block to improve our understanding of the timing and kinematics of the closure of the eastern Paleo‐Tethys Ocean. Characteristic remanent magnetization directions carried by magnetite and hematite formed during high‐temperature oxidation during initial cooling of the lavas are successfully isolated by progressive thermal and alternating field demagnetizations. We bin 28 site mean directions into 20 independent direction groups that pass the fold test, average secular variation, and show no rock magnetic or petrographic evidence of weathering. These data establish the first lava‐based paleomagnetic pole of Middle Triassic age for the northern Qiangtang block (62.2°N, 196.4°E, A95 = 5.6°). We compare this pole to coeval poles from the North China Block and Tarim and estimate that the remnant Paleo‐Tethys or Hoh‐Xil‐Songpan‐Ganzi Ocean could have been up to 700 km at ~240 Ma. A comparison of the Triassic latitudinal history between the northern Qiangtang block and the North China Block and Tarim shows that the closure of the Paleo‐Tethys Ocean most likely occurred during the latest Triassic. Our review of published Permian‐Triassic poles from the northern Qiangtang block show that the average south‐north plate velocity of the terrane decelerated from ~8.5 cm/yr during ~300–240 Ma to ~3.6 cm/yr during ~240–210 Ma. We suggest that an arc‐continent collision between the northern Qiangtang block and a Paleo‐Tethys or Yidun arc around or before 240 Ma contributed to this change in plate velocity.

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“…Therefore, investigation of the India‐Asia collisional process and associated intracontinental deformation is vital to understand the evolution of the Tibetan Plateau and the Asian climatic system (e.g., Wang et al, ; Yin, ). Although many studies have been carried out on the Tibetan Plateau and its adjacent areas over 40 years (e.g., Cao et al, ; Chen et al, , ; Ding et al, ; Klootwijk et al, ; Li et al, ; Lippert et al, , ; Ma et al, , , ; Molnar & Tapponnier, ; Otofuji et al, ; Tong et al, ; Wang et al, ; Yan et al, ; Zhu et al, , ), some key issues are still debated, such as the India‐Asia collisional age ranging from >65 Ma (e.g., Yin & Harrison, ) to <14 Ma (e.g., Xiao et al, ) and the size of Greater India ranging from >1,500 km to only approximately 400 km (e.g., Ali & Aitchison, ; Yi et al, ).…”

Section: Introductionmentioning

confidence: 99%

Precollisional Latitude of the Northern Tethyan Himalaya From the Paleocene Redbeds and Its Implication for Greater India and the India‐Asia collision

et al. 2019

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The precollisional paleolatitude of the Tethyan Himalaya is essential to constrain the India-Asia collision, the size of Greater India, and the Neotethyan paleogeography. However, reliable Late Cretaceous-Paleocene paleomagnetic datasets are still scarce because of serious remagnetization. Here we report the first redbed-based paleomagnetic results from the Paleocene (60-58 Ma) redbeds in the Saga area of the northern Tethyan Himalaya. The tilt-corrected site-mean direction obtained from 36 paleomagnetic sites is D=178.7°, I=9.5°with ɑ 95 =5.4°, corresponding to a paleopole at 55.9°N, 267.6°E with dp/dm=2.8°/5.5°and a paleolatitude of 4.8°±2.8°S for the study area (29.3°N, 85.3°E). The site-mean inclination increased from 9.5 to 14.9°after the anisotropy-based inclination shallowing correction, leading to corresponding paleolatitudes increasing from 4.8 to 7.6°S. This reliable paleomagnetic dataset passes positive fold tests and supports that the northern Tethyan Himalaya was located at 6.3±4.3°S during 60-58 Ma. Comparison with the coeval paleolatitudes expected from the Indian craton indicates that a north-south crustal shortening of 3.1±5.5°(340±610 km) occurred between the Indian craton and the northern Tethyan Himalaya after 59 Ma, and no wide ocean extended between them after the Latest Jurassic. Our new Paleocene results together with reliable Cretaceous paleomagnetic results from the Lhasa terrane show that the India-Asia collision occurred at 47.1±4.5 Ma.

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New Paleomagnetic Results From Middle Jurassic Limestones of the Qiangtang Terrane, Tibet: Constraints on the Evolution of the Bangong‐Nujiang Ocean

Cited by 48 publications

References 62 publications

Reconciling Orogenic Drivers for the Evolution of the Bangong‐Nujiang Tethys During Middle‐Late Jurassic

Reconciling Orogenic Drivers for the Evolution of the Bangong‐Nujiang Tethys During Middle‐Late Jurassic

Paleomagnetism of Middle Triassic Lavas From Northern Qiangtang (Tibet): Constraints on the Closure of the Paleo‐Tethys Ocean

Precollisional Latitude of the Northern Tethyan Himalaya From the Paleocene Redbeds and Its Implication for Greater India and the India‐Asia collision

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