Active faulting and tectonics of Burma and surrounding regions

American Geophysical Union (AGU) - Tập 89 Số B1 - Trang 453-472 - 1984
A. Y. Le Dain, Paul Tapponnier, Péter Molnár

Tóm tắt

This study of the active tectonics of Burma and surrounding regions is based mostly on an interpretation of Landsat imagery and on fault plane solutions for shallow and intermediate earthquakes. Fold axes in the Indoburman ranges and an east dipping inclined zone of intermediate depth earthquakes suggest that a slab of oceanic lithosphere was recently subducted to the east under the Indoburman ranges. Fault plane solutions of shallow earthquakes, however, do not show underthrusting at the present time. Instead, P axes are oriented roughly north‐south, parallel, not perpendicular, to the fold axes in the ranges. P axes for fault plane solutions of intermediate shocks also trend north‐south, parallel to the strike of the subducted slab, and may indicate that the hanging slab is being dragged north by India through the surrounding asthenosphere. The Sagaing fault probably accommodates most of the right‐lateral slip of India past Indochina, but India's northward movement also causes internal deformation within Burma, Thailand, and Yunnan. Differences between the tectonic fabric seen on the Landsat images and the tectonic regime compatible with the fault plane solutions throughout the region imply major changes in the directions of relative motion, in the orientations of strain, and in the style of deformation in the late Cenozoic. Presumably, these changes reflect the transition from subduction to collision and strike‐slip motion as India penetrated into Eurasia past Burma. Large parts of Burma and Thailand may have rotated several tens of degrees clockwise in this process.

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Tài liệu tham khảo

Academia Sinica Geologic map of Asia Beijing 1975.

Earth Sciences Research Division Geological map of Burma Burma 1977.

10.1144/gsjgs.136.5.0529

Bignell J. D. H. J.Snelling Geochronology of Malayan granites Overseas Geol. Miner. Resour. 47 72 1977.

10.1080/00167616608728608

Bunopas S., 1978, Proceedings of the Third Regional Conference, Conference on Geological and Mineral Resources of Southeast Asia

10.1029/JB083iB06p02825

Chhibber H. L., 1934, Geology of Burma

10.1007/978-3-662-01141-6_45

Curray J. R., 1978, Geological and Geophysical Investigations of Continental Margins, 189

10.1007/978-1-4615-8038-6_9

10.1016/0040-1951(79)90100-8

10.1029/JB075i014p02699

10.1029/JB077i023p04432

Gutenberg B., 1954, Seismicity of the Earth and Associated Phenomena

10.1029/ME001p0015

Hamilton W. Tectonics of the Indonesian region U.S. Geol. Surv. Prof. Pap. 1078 345 1979.

Institute of Geophysics Brief records of strong shocks of China and map of epicenters of strong shocks of China Academia Sinica Beijng 1976.

10.1029/RG009i001p00103

Thein Maung, 1973, A preliminary synthesis of the geological evolution of Burma with reference to the tectonic development of southeast Asia, Bull. Geol. Soc. Malays., 6, 87, 10.7186/bgsm06197307

10.1029/JB083iB11p05331

Mitchell A. H. G., 1976, Southeast Asian tin granites: Magmatism and mineralization in subduction and collision related setting, Newsl. United Nations Committee for Coordination of Offshore Prospecting, 3, 10

Mitchell A. H. G., 1977, Tectonic settings for emplacement of southeast Asian tin granites, Bull. Geol. Soc. Malays., 9, 123, 10.7186/bgsm09197710

10.1144/gsjgs.138.2.0109

10.1130/0016-7606(1975)86<305:AEOTBO>2.0.CO;2

10.1126/science.189.4201.419

10.1016/0012-821X(73)90104-0

Molnar P., 1977, Himalaya: Sciences de la Terre, 267

Padang Neuman, 1963, Arabia and the Indian Ocean, 25

Richter C. F., 1958, Elementary Seismology

10.1130/0016-7606(1969)80[1203:BAMGOT]2.0.CO;2

Santo T., 1969, Regional study of the characteristic seismicity of the world, II, From Burma down to Java, Bull. Earthquake. Res. Inst. Tokyo Univ., 47, 1049

10.1029/GD003p0215

Sengör A. M. C. Outline of Tethyan evolution in the Tibetan Himalayan segment of the Eurasiatic Alp idesProceedings of the Qinghai Xizang International SymposiumAcademia SinicaBeijing 1981.

10.1144/gsjgs.137.1.0001

10.1038/264319a0

10.1029/JB082i020p02905

10.1029/JB084iB07p03425

10.1038/294410a0

Verma R. K., 1976, Seismicity, gravity and tectonic features of northeastern India and northern Burma, Bull. Seismol. Soc. Am., 66, 1683, 10.1785/BSSA0660051683

10.2475/ajs.s5-7.42.441

Warsi W. E. K., 1977, Himalaya: Sciences de la Terre, 463

10.1130/0091-7613(1983)11<279:LDAMVE>2.0.CO;2

Swe Win, 1972, Regional Conference on the Geology of Southeast Asia, 59

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American Geophysical Union (AGU)

Tập 89 Số B1

453-472

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