Paleomagnetic study of Cretaceous rocks from the Yangtze block, central Yunnan, China: implications for the India-Asia collision

Funahara, Shoubu; Nishiwaki, Nobukazu; Miki, Masako; Murata, Fumiyuki; Otofuji, Yo–ichiro; Wang, Yi Zhao

doi:10.1016/0012-821x(92)90212-e

Cited by 66 publications

(25 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure shows a general predominance of variable magnitude CW rotations from Jurassic‐Oligocene rocks, and Neogene sediments and deposits show barely significant rotations. 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, ).…”

Section: Geologic Settingmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Geologic Settingmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Different parts of the Lanping-Simao tectonic element rotated differentially from 0° to more than 90° clockwise (e.g., Huang and Opdike, 1993;Funahara et al, 1992Funahara et al, , 1993Chen et al, 1995;Geissman et al, 1999Geissman et al, , 2001. The structures have a foreland-fold thrust belt style and are interpreted to be detached within the middle to upper crust .…”

Section: Conclusion and Implications For Asian Tectonicsmentioning

confidence: 99%

Geometry, kinematics, and regional significance of the Chong Shan shear zone, Eastern Himalayan Syntaxis, Yunnan, China

et al. 2008

View full text Add to dashboard Cite

“…The available palaeomagnetic data from East Asia reveal an occurrence of rotational motion mainly in the Shan-Thai, Indochina and Chuan Dian blocks, which forms part of eastern Himalayan syntaxes (Funahara et al 1992(Funahara et al , 1993Huang & Opdyke 1993;Yang & Besse 1993;Otofuji et al 1998;Sato et al 1999Sato et al , 2007Yang et al 2001;Yoshioka et al 2003;Aihara et al 2007; Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Tectonic deformation of the Indochina Peninsula recorded in the Mesozoic palaeomagnetic results

Takemoto

Sato

Chanthavichith

et al. 2009

Geophysical Journal International

Self Cite

View full text Add to dashboard Cite

S U M M A R YIn order to describe features of tectonic deformation in the Indochina Peninsula, Early Jurassic to Early Cretaceous red sandstones were sampled at three localities in the Shan-Thai and Indochina blocks. Stepwise thermal treatment of most samples revealed the presence of characteristic remanent magnetization, which is generally unblocked by 680 • C. This component from Phong Saly (21.6 • N, 101.9 • E) and Borikhanxay (18.5 • N, 103.8 • E) localities yield positive fold tests with Late Jurassic-Early Cretaceous directions of Dec/Inc = 28.8 • /32.1 • (k s = 15.4, α 95 = 8.8 • , N = 22) and Dec/Inc = 42.1 • /46.9 • (k s = 20.1, α 95 = 7.9 • , N = 18), respectively. Additionally, a syn-folding mid-Cretaceous characteristic magnetization is observed in the samples of Muang Phin locality (16.5 • N, 106.1 • E), which gave a mean direction of Dec/Inc = 30.8 • /39.9 • , k = 102.6, α 95 = 3.0 • , N = 23. This reliable Late Jurassic to Mid-Cretaceous palaeomagnetic directions from three different localities are incorporated into a palaeomagnetic database for Shan-Thai and Indochina blocks. Based on these compilations, tectonic deformation of the Shan-Thai and Indochina blocks is summarized as follows: (1) the Shan-Thai and Indochina blocks experienced a clockwise rotation of about 10 • as a composite unit in the early stage of India-Asia collision and (2) following this, the Shan-Thai Block underwent an internal tectonic deformation, whereas the Indochina Block behaved as a rigid tectonic unit during the same period. Comparison of our palaeomagnetic results with seismic tomographic images suggests that the strength of continental lithosphere beneath these blocks played an important role in the process of deformation rather than any other tectonic regime. In contrast to the Shan-Thai Block, an existence of continental roots beneath the Indochina Block prevented its internal deformation.

show abstract

Paleomagnetic study of Cretaceous rocks from the Yangtze block, central Yunnan, China: implications for the India-Asia collision

Cited by 66 publications

References 42 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?

Geometry, kinematics, and regional significance of the Chong Shan shear zone, Eastern Himalayan Syntaxis, Yunnan, China

Tectonic deformation of the Indochina Peninsula recorded in the Mesozoic palaeomagnetic results

Contact Info

Product

Resources

About