Evidences for cessation of Indian Plate Subduction in the Burmese Arc Region

Rao, N. Purnachandra; Kumar, M. Ravi

doi:10.1029/1999gl005396

Cited by 67 publications

(38 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The earlier seismologic studies suggested the cessation of subduction beneath the Burma Plate in the western Myanmar (e.g., Rao and Kumar, 1999) and no evidence of present-day active subduction to the north of the Andaman Islands, as it is shown by Table 1 Stratigraphy of the southern Chindwin Sub-Basin in the Central Myanmar Basin, and the stratigraphic intervals of the analyzed samples (modified after Aung Khin and Kyaw Win, 1969;Bender, 1983 Fossil rare, a palynological assemblage zone indicates the early Miocene (Reimann and Aye Thaung, 1981;Engelhardt, 1993) -…”

Section: Western Myanmar Subduction Zone: Andaman-arakan Trenchmentioning

confidence: 98%

Provenance of the Eocene sandstones in the southern Chindwin Basin, Myanmar: Implications for the unroofing history of the Cretaceous–Eocene magmatic arc

Oo¹,

Zaw

Meffre

et al. 2015

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

Section: Western Myanmar Subduction Zone: Andaman-arakan Trenchmentioning

confidence: 98%

Provenance of the Eocene sandstones in the southern Chindwin Basin, Myanmar: Implications for the unroofing history of the Cretaceous–Eocene magmatic arc

Oo¹,

Zaw

Meffre

et al. 2015

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

“…In Myanmar, east of the Arakan Trench, the Arakan accretionary wedge is affected by shallow seismicity [ Dasgupta et al , 2003; Rao and Kumar , 1999; Satyabala , 2003] along large N/S strike‐slip faults [ Bender , 1983; Guzman‐Speziale and Ni , 1996; Socquet et al , 2002]. The Myanmar Central Basins bound this mountain belt to the east [ Bender , 1983; Pivnik et al , 1998; Rangin et al , 1999].…”

Section: Geodynamic Settingmentioning

confidence: 99%

India and Sunda plates motion and deformation along their boundary in Myanmar determined by GPS

et al. 2006

View full text Add to dashboard Cite

[1] Using a regional GPS data set including $190 stations in Asia, from Nepal to eastern Indonesia and spanning 11 years, we update the present-day relative motion between the Indian and Sundaland plates and discuss the deformation taking place between them in Myanmar. Revisiting measurements acquired on the Main Boundary Thrust in Nepal, it appears that points in southern Nepal exhibit negligible deformation with respect to mainland India. Including these points, using a longer time span than previous studies, and making an accurate geodetic mapping in the newest reference frame allows us to refine the present-day Indian motion. Our results confirm that the current motion of India is slower than predicted by the NUVEL-1A model, and in addition our India-Eurasia motion is significantly ($5 mm/yr) slower than previous geodetic determinations. This new Indian motion, combined with a refined determination of the Sundaland motion, gives way to a relative India-Sunda angular velocity of 20.2°N, 26.1°E, 0.370°/Myr in ITRF2000, predicting a relative motion of 35 mm/yr oriented N10°at the latitude of Myanmar. There, the Sagaing Fault accommodates only 18 mm/yr of right-lateral strike slip, only half of the shear component of motion. We present two models addressing how and where the remaining deformation may occur. A first model of distributed deformation implies convergence on the Arakan subduction (the northern continuation of the now famous Sumatra-Andaman Trench) and wrench faulting in the Arakan wedge. The second model uses localized deformation, where deformation observed west of the Sagaing Fault is entirely due to elastic loading on a faster and oblique Arakan subduction (23 mm/yr). This latter model predicts that a major earthquake of M w 8.5 may occur every century on this segment of the subduction.

show abstract

“…Popa in Myanmar; both of which are believed to be either dormant or extinct (Curray 2005). Limited volcanic activity in this arc has been attributed either to the oblique nature of the subduction or to its complete cessation (e.g., Hurukawa et al 2012;Rao and Kumar 1999). From the volcanic history of the region, it is apparent that Barren Island volcano is the last of the active magmatic centers in the northern sector of the southwardly locking Sunda-Andaman subduction zone.…”

Section: Introductionmentioning

confidence: 96%

40Ar/39Ar geochronology of subaerial lava flows of Barren Island volcano and the deep crust beneath the Andaman Island Arc, Burma Microplate

2015

View full text Add to dashboard Cite

Little was known about the nature and origin of the deep crust beneath the Andaman Island Arc in spite of the fact that it formed part of the highly active Indonesian volcanic arc system, one of the important continental crust forming regions in Southeast Asia. This arc, formed as a result of subduction of the Indian Plate beneath the Burma Microplate (a sliver of the Eurasian Plate), contains only one active subaerial magmatic center, Barren Island volcano, whose evolutional timeline had remained uncertain. In this work, we present results of the first successful attempt to date crustal xenoliths and their host lava flows from the island, by incremental heating 40 Ar/ 39 Ar method, in an attempt to understand the evolutionary histories of the volcano and its basement. Based on concordant plateau and isochron ages, we establish that the oldest subaerial lava flows of the volcano are 1.58±0.04 (2σ) Ma, and some of the plagioclase xenocrysts have been derived from crustal rocks of 106±3 (2σ) Ma. Mineralogy (anorthite + Cr-rich diopside + minor olivine) and isotopic compositions ( 87 Sr/ 86 Sr<0.7040; ε Nd >7.0) of xenoliths not only indicate their derivation from a lower (oceanic) crustal olivine gabbro but also suggest a genetic relationship between the arc crust and the ophiolitic basement of the Andaman accretionary prism. We speculate that the basements of the forearc and volcanic arc of the Andaman subduction zone belong to a single continuous unit that was once attached to the western margin of the Eurasian Plate.

show abstract

Evidences for cessation of Indian Plate Subduction in the Burmese Arc Region

Cited by 67 publications

References 17 publications

Provenance of the Eocene sandstones in the southern Chindwin Basin, Myanmar: Implications for the unroofing history of the Cretaceous–Eocene magmatic arc

Provenance of the Eocene sandstones in the southern Chindwin Basin, Myanmar: Implications for the unroofing history of the Cretaceous–Eocene magmatic arc

India and Sunda plates motion and deformation along their boundary in Myanmar determined by GPS

40Ar/39Ar geochronology of subaerial lava flows of Barren Island volcano and the deep crust beneath the Andaman Island Arc, Burma Microplate

Contact Info

Product

Resources

About