Post-folding magnetization of the Triassic rocks from western Guizhou and southern Yunnan provinces: New evidence for large clockwise rotations in the Simao Terrane

Huang, Kainian; Opdyke, Neil D.

doi:10.1016/j.epsl.2015.05.015

Cited by 15 publications

(31 citation statements)

References 30 publications

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“…The composite IRM results show that most of the IRM is unblocked along the high and intermediate‐coercivity (2.7–0.12 T) axes and is fully unblocked at 680 °C (Figure S1 in the supporting information). Thus, all paleomagnetic data show the almost exclusive occurrence of hematite with variable grain size as remanence carrier, consistently with previous evidence from red beds sampled in the same region (Funahara et al, ; Huang & Opdyke, , ; Li, Yang, et al, ; Otofuji et al, , ; Sato et al, ; Tanaka et al, ; Tong et al, ; Wang et al, ).…”

Section: Sampling and Methodssupporting

confidence: 88%

“…The internal deformation of the north Indochina “blocks” has been proposed in several papers, besides the seminal work by Wang & Burchfiel, ; Wang et al, ; Tanaka et al, ; Otofuji et al, ; Tsuchiyama et al, ). Other studies considered rotation variability to represent simply data scatter compared to megablock rigid rotations (Funahara et al, ; Huang & Opdyke, , ; Li, Advokaat, et al, ; Li et al, ; Otofuji et al, ; Tong et al, ). Yoshioka et al (), Kondo et al (), and Gao et al () proposed that local rotations are due to oroclinal bending of already formed thrust‐fold structures, a pattern that is not substantiated by our data.…”

Section: Discussion: Crust Fragmentation Within the Simao And Lanpingmentioning

confidence: 99%

“…Most authors explain the predominantly CW rotation pattern of north Indochina as related to the eastward extrusion of “microplates” during India‐Eurasia collision (Funahara et al, ; Huang & Opdyke, , ; Li, Advokaat, et al, ; Li et al, ; Otofuji et al, ; Tong et al, ). Our paleomagnetic data document upper crust fragmentation and independent deformation, including rotation, of 2–5 km wide blocks, instead of drifting/rotation of internally rigid lithospheric scale megablocks.…”

Section: Discussion: Crust Fragmentation Within the Simao And Lanpingmentioning

confidence: 99%

“…The Chuandian domain yields a rather clear pattern of 15–20° CW rotations for Cretaceous‐Oligocene red beds (Funahara et al, ; Gao et al, ; Li et al, , ; Otofuji et al, ; Tong et al, ; Wang, Yang, et al, ; Yang, Sun, et al, ; Yoshioka et al, ; Zhu et al, ). Jurassic‐Oligocene red beds from the Baoshan, Lanping, and northern Simao domains provide highly variable CW rotations, in few cases exceeding 90° (Chen et al, ; Funahara et al, ; Gao et al, ; Huang & Opdyke, , ; Kondo et al, ; Li, Yang, et al, ; Li et al, ; Sato et al, , , ; Tanaka et al, ; Tong et al, , ; Yang, Yin, et al, ; Yang, Sun, et al, ). In the Tengchong domain, both CW and counterclockwise (CCW) rotations have been documented (Kornfeld et al, , ).…”

Section: Geologic Settingmentioning

confidence: 99%

“…Most of the published paleomagnetic studies (Funahara et al, ; Huang & Opdyke, , ; Li, Advokaat, et al, ; Li et al, ; Otofuji et al, ; Tong et al, ) associate the CW rotations to the eastward drifting microplate model put forward by Tapponnier et al (, ), identifying each shear zone‐bounded domain with a rigid rotating block. However, a major problem of space would arise if one assumes that the N‐S elongated Baoshan and Lanping domains rotated CW by some 80°, questioning the internal block rigidity and appropriate delineation of a tectonic block.…”

Section: Geologic Settingmentioning

confidence: 99%

See 4 more Smart Citations

Paleomagnetic Evidence for 25–15 Ma Crust Fragmentation of North Indochina (23–26°N): Consequence of Collision With Greater India NE Corner?

Speranza

Pellegrino

Zhang

et al. 2019

Geochem Geophys Geosyst

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The Cenozoic deformation of SE Asia is classically related to India‐Asia collision and Tibet Plateau rise, supposedly resulting in the southeastward drift of lithospheric blocks bounded by strike‐slip faults with displacements in the order of 1,000 km. Here we report on the paleomagnetism of 44 Triassic‐Cretaceous red bed sites from the northern Simao, Chuandian, and Lanping “blocks,” along both sides of the Ailao Shan‐Red River shear zone (north Indochina). In the Simao domain, remagnetization predates folding and subsequent 48–70° clockwise rotation of three 2–5 km wide subblocks separated by two unrotated blocks. A primary magnetization component from the Lanping domain center suggests variably clockwise rotated (up to 95° ± 24°) sites, interrupted by a 2–6 km wide block that is rotated counterclockwise by 27° ± 6°. Thus, the Lanping and Simao “blocks” are far from being rigid, being made of a mosaic of independently deforming subblocks, whose kinematics and association with documented tectonics are speculative. It is unclear whether both folding and widespread remagnetization were synchronous or diachronous across north Indochina, but (considering previously published results) strike‐slip activity along major shear zones, remagnetization, rotations, and crustal shortening overlapped within the 32–15 Ma time window, thus were likely genetically related. As opposed to previous models, we suggest that in early to mid‐Cenozoic times, north Indochina was under the influence of oblique Neo‐Tethys subduction. Collision between the NE corner of Greater India and Indochina at ~30 Ma yielded ENE‐WSW shortening and strike‐slip reactivation of preexisting faults, in turn fragmenting the crust into small, independently rotating, blocks.

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Section: Sampling and Methodssupporting

confidence: 88%

Section: Discussion: Crust Fragmentation Within the Simao And Lanpingmentioning

confidence: 99%

Section: Discussion: Crust Fragmentation Within the Simao And Lanpingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

See 3 more Smart Citations

Paleomagnetic Evidence for 25–15 Ma Crust Fragmentation of North Indochina (23–26°N): Consequence of Collision With Greater India NE Corner?

Speranza

Pellegrino

Zhang

et al. 2019

Geochem Geophys Geosyst

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53–43 Ma Deformation of Eastern Tibet Revealed by Three Stages of Tectonic Rotation in the Gongjue Basin

Yang

Huang

et al. 2018

JGR Solid Earth

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The Gongjue basin from the eastern Qiangtang terrane is located in the transition region where the regional structural lineation curves from east‐west‐oriented in Tibet to north‐south‐oriented in Yunnan. In this study, we sampled the red beds in the basin from the lower Gongjue to upper Ranmugou formations for the first time covering the entire stratigraphic profile. The stratigraphic ages are bracketed within 53–43 Ma by new detrital zircon U‐Pb ages constraining the maximum deposition age to 52.5 ± 1.5 Ma. Rock magnetic and petrographic studies indicate that detrital magnetite and hematite are the magnetic carriers. Positive reversals and fold tests demonstrate that the characteristic remanent magnetization has a primary origin. The Gongjue and Ranmugou formations yield mean characteristic remanent magnetization directions of Ds/Is = 31.0°/21.3° and Ds/Is = 15.9°/22.0°, respectively. The magnetic inclination of these characteristic remanent magnetizations is significantly shallowed compared to the expected inclination for the locality. However, the elongation/inclination correction method does not provide a meaningful correction, likely because of syn‐depositional rotation. Rotations relative to the Eurasian apparent polar wander path occurred in three stages: Stage I, 33.3 ± 3.4° clockwise rotation during the deposition of the Gongjue and lower Ranmugou formations; Stage II, 26.9 ± 3.7° counterclockwise rotation during deposition of the lower and middle Ranmugou formation; and Stage III, 17.7 ± 3.3° clockwise rotation after 43 Ma. The complex rotation history recorded in the basin is possibly linked to sinistral shear along the Qiangtang block during India indentation into Asia and the early stage of the extrusion of the northwestern Indochina blocks away from eastern Tibet.

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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

137

146

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Post-folding magnetization of the Triassic rocks from western Guizhou and southern Yunnan provinces: New evidence for large clockwise rotations in the Simao Terrane

Cited by 15 publications

References 30 publications

Paleomagnetic Evidence for 25–15 Ma Crust Fragmentation of North Indochina (23–26°N): Consequence of Collision With Greater India NE Corner?

Paleomagnetic Evidence for 25–15 Ma Crust Fragmentation of North Indochina (23–26°N): Consequence of Collision With Greater India NE Corner?

53–43 Ma Deformation of Eastern Tibet Revealed by Three Stages of Tectonic Rotation in the Gongjue Basin

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

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