New insights into regional tectonics of the Indochina Peninsula inferred from Lower-Middle Jurassic paleomagnetic data of the Sibumasu Terrane

Fujiwara, Katsuya P.; Zaman, Haider; Surinkum, Adichat; Chaiwong, Nikhom; Fujihara, Makoto; Ahn, Hyeon‐Seon; Otofuji, Yo–ichiro

doi:10.1016/j.jseaes.2014.08.020

Cited by 8 publications

(2 citation statements)

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“…After rotating these areas back according to their paleomagnetic declinations, the strike of the Qiangtang terrane and bounding Bangong‐Nujiang suture would be restored to a NW‐SE direction, suggesting that the southern margin of Qiangtang Block was a straight or slightly bent structure prior to the construction of the Tibetan Plateau, with an orientation of ~N60°W (Figure ). Fujiwara et al () found that the southern Sibumasu was also originally a straight structure with a general trend of N10°W based on the paleomagnetic data from southern Sibumasu, which would suggest that there is a 50° turn between the Qiangtang/northern Sibumasu and southern Sibumasu (Figure ). Such a ~50° bend is also consistent with the strike of the main Neotethys slab in the lower mantle (Replumaz et al, , ).…”

Section: Discussionmentioning

confidence: 99%

Paleomagnetic Constraints From the Baoshan Area on the Deformation of the Qiangtang‐Sibumasu Terrane Around the Eastern Himalayan Syntaxis

Hinsbergen

Deng

et al. 2018

JGR Solid Earth

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The Sibumasu Block in SE Asia represents the eastward continuation of the Qiangtang Block. Here we report a detailed rock magnetic and paleomagnetic study on the Middle Jurassic and Paleocene rocks from northern Sibumasu, to document the crustal deformation during the India‐Asia collision since the Paleocene and reconstruct the overall strike of the Qiangtang/Sibumasu elements before the India‐Asia collision. Although the fold test is inconclusive based solely on our data, a positive reversal test, a positive regional fold test with previous paleomagnetic results, and a detrital origin of hematite in the red beds as indicated by scanning electron microscopy suggest that the magnetizations obtained from the Jurassic and Paleocene rocks are most likely primary, showing an ~80° clockwise rotation since Paleocene. These results, together with previously published paleomagnetic data, suggest that the northern Sibumasu and northern Simao elements experienced a ~60–80° clockwise rotation since Paleocene. This large clockwise rotation is also consistent with the surface GPS velocity field and NE‐SW fault networks, suggesting a rotational motion of crustal material from southeastern Tibet during late Cenozoic. We infer that the large clockwise rotation is a sum of rotation in the Eocene to Middle Miocene time associated with Indochina extrusion and rotation after the Middle Miocene associated with the E‐W extension in central Tibet. This suggests that the eastward motion of Tibetan crustal material along the Xianshuihe‐Xiaojiang fault after Middle Miocene is transmitted to the southwest toward Myanmar. Jurassic and Cretaceous paleomagnetic results suggest that the Qiangtang/northern Sibumasu was originally a curved structure with an orientation of N60°W in Tibet and changes to N10°W in southern Sibumasu.

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Section: Discussionmentioning

confidence: 99%

Paleomagnetic Constraints From the Baoshan Area on the Deformation of the Qiangtang‐Sibumasu Terrane Around the Eastern Himalayan Syntaxis

Hinsbergen

Deng

et al. 2018

JGR Solid Earth

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“…S. Li et al Earth-Science Reviews 171 (2017) 58-77 et al, 2004;Takemoto et al, 2005Takemoto et al, , 2009Charusiri et al, 2006;Aihara et al, 2007;Tanaka et al, 2008;Kondo et al, 2012;Li et al, 2012Li et al, , 2013aChi and Geissman, 2013;Tong et al, 2013Tong et al, , 2015Tong et al, , 2016Fujiwara et al, 2014;Kornfeld et al, 2014a, b;Gao et al, 2015;Wang et al, 2016). Achache et al (1983) is the first to review the available Cretaceous and Cenozoic paleomagnetic data from Southeast Asia to test the amount of latitudinal motion and rotation of the Indochina Block, and they argued that the Indochina Block experienced a 24 ± 12°clockwise rotation and a 4.6 ± 7.6°(~500 ± 1280 km) southward motion relative to the Eurasia after the Middle Jurassic.…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetic constraints on the Mesozoic-Cenozoic paleolatitudinal and rotational history of Indochina and South China: Review and updated kinematic reconstruction

Advokaat

Hinsbergen

et al. 2017

Earth-Science Reviews

146

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A palaeomagnetic study of the Middle Permian and Middle Triassic limestones from Shan State, Myanmar: Implications for collision of the Sibumasu Terrane and Indochina Terrane

et al. 2019

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We report herein a new palaeomagnetic study on the Middle Permian and Middle Triassic limestones from Shan State of eastern Myanmar, aiming to resolve the spatial location of the Sibumasu Terrane during the collision of tectonic blocks in Southeast Asia and to constrain the timing of convergence between the Sibumasu Terrane and Indochina Terrane. Based on the rock magnetic and palaeomagnetic experiments, three stable characteristic remnant magnetizations are recognized from limestone specimens of Middle Permian and Middle Triassic age. The characteristic Component C of the Middle Permian limestone passed the fold test at 95% confidence level, indicative of a pre‐folding origin. The mean direction of this component is D = 10.7°, I = 17.9° (κ = 130.3, α95 = 10.8°) before and D = 13.7°, I = −25.3° (κ = 1894.9, α95 = 2.8°) after tilt correction, corresponding to a palaeomagnetic pole at 254.1°E, 53.2°N (A95 = 1.7°). This suggests that the Sibumasu Terrane was placed at a palaeolatitude of ~13.0°S during the Middle Permian. The Component C separated from the Middle Triassic samples also passed the fold test with a mean direction of D = 207.3°, I = −8.3° (κ = 12.9, α95 = 6.2°) before tilt correction and D = 205.6°, I = −33.5° (κ = 27.1, α95 = 4.2°) after tilt correction, corresponding to a palaeomagnetic pole at 187.3°E, 65.8°N (dp/dm = 2.7°/4.8°). This implies that the Sibumasu Terrane was located at a palaeolatitude of ~18.3°N during the Middle Triassic. Based upon the detailed palaeomagnetic analysis, this study supports the view that the collision of the Sibumasu Terrane and Indochina Terrance occurred during or before the Middle–Late Triassic times.

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New insights into regional tectonics of the Indochina Peninsula inferred from Lower-Middle Jurassic paleomagnetic data of the Sibumasu Terrane

Cited by 8 publications

References 64 publications

Paleomagnetic Constraints From the Baoshan Area on the Deformation of the Qiangtang‐Sibumasu Terrane Around the Eastern Himalayan Syntaxis

Paleomagnetic Constraints From the Baoshan Area on the Deformation of the Qiangtang‐Sibumasu Terrane Around the Eastern Himalayan Syntaxis

Paleomagnetic constraints on the Mesozoic-Cenozoic paleolatitudinal and rotational history of Indochina and South China: Review and updated kinematic reconstruction

A palaeomagnetic study of the Middle Permian and Middle Triassic limestones from Shan State, Myanmar: Implications for collision of the Sibumasu Terrane and Indochina Terrane

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