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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

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
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

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, α 95 = 10.8°) before and D = 13.7°, I = −25.3° (κ = 1894.9, α 95 = 2.8°) after tilt correction, corresponding to a palaeomagnetic pole at 254.1°E, 53.2°N (A 95 = 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, α 95 = 6.2°) before tilt correction and D = 205.6°, I = −33.5° (κ = 27.1, α 95 = 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.

eastern Palaeotethys, Middle Permian, Middle Triassic, palaeomagnetism, Shan State, Sibumasu Terrane, Southeast Asia
0072-1050
Zhao, Jie
3be79b67-2e5f-4fc1-a6db-539f6a04aece
Huang, Baochun
e77c032d-1dbc-4bf4-a8f8-1449090d5240
Yan, Yonggang
24a2d5e2-5ee5-49b0-bb86-67d5eb53cc25
Bai, Qianhui
8ee607e4-9b44-487b-98df-a31b04b28bac
Dong, Yunpeng
26732ecd-87ad-4b83-8bf4-467fa27c16ed
Win, Zaw
521efc8c-c05d-438f-8e0e-a7b4933a23d3
Aung, Hla Hla
274c7296-70ea-4913-b328-46bd258c5551
Yang, Xiaodong
0c44aab1-3c52-4e2a-925e-565a34967c57
Zhao, Jie
3be79b67-2e5f-4fc1-a6db-539f6a04aece
Huang, Baochun
e77c032d-1dbc-4bf4-a8f8-1449090d5240
Yan, Yonggang
24a2d5e2-5ee5-49b0-bb86-67d5eb53cc25
Bai, Qianhui
8ee607e4-9b44-487b-98df-a31b04b28bac
Dong, Yunpeng
26732ecd-87ad-4b83-8bf4-467fa27c16ed
Win, Zaw
521efc8c-c05d-438f-8e0e-a7b4933a23d3
Aung, Hla Hla
274c7296-70ea-4913-b328-46bd258c5551
Yang, Xiaodong
0c44aab1-3c52-4e2a-925e-565a34967c57

Zhao, Jie, Huang, Baochun, Yan, Yonggang, Bai, Qianhui, Dong, Yunpeng, Win, Zaw, Aung, Hla Hla and Yang, Xiaodong (2019) 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. Geological Journal. (doi:10.1002/gj.3482).

Record type: Article

Abstract

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, α 95 = 10.8°) before and D = 13.7°, I = −25.3° (κ = 1894.9, α 95 = 2.8°) after tilt correction, corresponding to a palaeomagnetic pole at 254.1°E, 53.2°N (A 95 = 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, α 95 = 6.2°) before tilt correction and D = 205.6°, I = −33.5° (κ = 27.1, α 95 = 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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More information

Accepted/In Press date: 22 January 2019
e-pub ahead of print date: 4 March 2019
Keywords: eastern Palaeotethys, Middle Permian, Middle Triassic, palaeomagnetism, Shan State, Sibumasu Terrane, Southeast Asia

Identifiers

Local EPrints ID: 431779
URI: https://eprints.soton.ac.uk/id/eprint/431779
ISSN: 0072-1050
PURE UUID: a619e7d6-ec7e-4eb2-a3a5-c8e3d924d77a

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Date deposited: 14 Jun 2019 16:30
Last modified: 14 Jun 2019 16:30

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Contributors

Author: Jie Zhao
Author: Baochun Huang
Author: Yonggang Yan
Author: Qianhui Bai
Author: Yunpeng Dong
Author: Zaw Win
Author: Hla Hla Aung
Author: Xiaodong Yang

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