Chapter 8 The Eastern (Back-arc) Basin of Central Myanmar: Basement rocks, lithostratigraphic units, palaeocurrents, provenance and developmental history

Thein, Myint; Maung, Maung

doi:10.1144/m48.8

Cited by 16 publications

(5 citation statements)

References 18 publications

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“…Similarly, pre-Cretaceous zircons in the Yaw Formation could have been supplied by exhuming basement rocks in the Greater Burma region to the north, because the Eocene Phokphur conglomerates in the northern IBR (Aitchison et al, 2019;Cai et al, 2019) and Eocene sediments in the northernmost Chindwin Basin (Arboit et al, 2020) have comparable pre-Cretaceous age peaks as the Yaw Formation suggesting similar sourcing (Figure 8). Yaw Formation sourcing from north of the BT could have occurred in the Burmese backarc where sparse paleocurrent measurements suggest southward directed drainage systems since the late Eocene (Figure 11a; Thein & Maung, 2017). In any case, apatite U-Pb and AFT ages for the Yaw Formation are up to~30 Ma older than the depositional age of the unit, suggesting that the Yaw Formation sources were just starting to get exhumed and that deeply buried rocks had not been exposed yet.…”

Section: Sedimentary Provenance 531 Yaw Formationmentioning

confidence: 94%

“…The Paleogene deposits in the Shwebo Basin are exclusively continental with southward prograding fluvio-deltaic sequences (Thein & Maung, 2017), while those in the Pegu Basin have not been described. Since the Neogene, both basins were characterized by southward prograding tidal-influenced estuarian sequences, before being overlain by fluvial deposits of the Quaternary Irrawaddy Formation (Bender, 1983;Khin, 1999;Pivnik et al, 1998;Thein & Maung, 2017). The Burmese forearc basins are commonly subdivided into the Minbu (or Salin) Basin in the south, which has been relatively well documented due to its hydrocarbon potential (Pivnik et al, 1998), and the less well-documented Chindwin Basin in the north (Figure 1a).…”

Section: Central Myanmar Basinsmentioning

confidence: 99%

“…The Burmese backarc consists of the Shwebo Basin in the north and the Pegu Basin in the south (Figure 1a). The Paleogene deposits in the Shwebo Basin are exclusively continental with southward prograding fluvio-deltaic sequences (Thein & Maung, 2017), while those in the Pegu Basin have not been described. Since the Neogene, both basins were characterized by southward prograding tidal-influenced estuarian sequences, before being overlain by fluvial deposits of the Quaternary Irrawaddy Formation (Bender, 1983;Khin, 1999;Pivnik et al, 1998;Thein & Maung, 2017).…”

Section: Central Myanmar Basinsmentioning

confidence: 99%

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Burma Terrane Collision and Northward Indentation in the Eastern Himalayas Recorded in the Eocene‐Miocene Chindwin Basin (Myanmar)

et al. 2020

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The Burma Terrane (Myanmar) played an important role in the India-Asia collision and moved over 2,000 km northward on the Indian Plate during the Cenozoic, before colliding with the Asian margin. However, the timing of this collision and its correlation to regional uplift phases, sedimentary provenance, and basin development remain poorly constrained. We report sedimentological, paleomagnetic, and geochronological data from the late Eocene to early Miocene strata of the Chindwin Basin in the Burmese forearc, constraining the paleogeographic evolution of the Burma Terrane and the Eastern Himalayan orogen. Our results highlight two unconformities of late Eocene-middle Oligocene and latest Oligocene-early Miocene age, revealing a two-stage interaction of the Burma Terrane with the Asian margin during its northward translation. The first unconformity follows rapid~0.6 m/ky subsidence in the Burmese forearc, as shown by magnetostratigraphy. The transition to a fluvial depositional environment and the occurrence of reworked sediments at this first unconformity likely records the commencing collision of India and the northern extent of the Burma Terrane with the Asian margin. The second unconformity shows drastic changes in magnetic properties, mineralogy, and provenance, with high-grade metamorphic grains and early Miocene apatite U-Pb and fission-track ages indicating that it is coeval to a major deformation phase in Myanmar and the Eastern Himalayan orogen. It likely records the indentation of the Burma Terrane into the Eastern Himalayan collision zone, forming the modern Eastern Himalayan Syntaxis.

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Section: Sedimentary Provenance 531 Yaw Formationmentioning

confidence: 94%

Section: Central Myanmar Basinsmentioning

confidence: 99%

Section: Central Myanmar Basinsmentioning

confidence: 99%

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Burma Terrane Collision and Northward Indentation in the Eastern Himalayas Recorded in the Eocene‐Miocene Chindwin Basin (Myanmar)

et al. 2020

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“…The basin's sediments are primarily derived from the eastern part of the Indo-Myanmar Ranges (IMR), which experienced collision and uplift. These sediments were transported by various major river systems, including the Irrawaddy River, as the Indian Plate migrated from the east to the north [20] . The Pre-rift sediments of the Salin basin include limestone, shale, and sandstone of KB Formation (Late Cretaceous).…”

Section: Tectonic Setting and Regional Geologymentioning

confidence: 99%

Seismic stratigraphy and structural analysis in the determination of petroleum play within Salin basin, Myanmar

Aung,

Maw,

Moe

et al. 2023

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<p>This study presents a new interpretation of the seismic stratigraphic unit equivalent to the Late Cretaceous to Pliocene formations in the Salin basin. Many researchers investigated the outcrops of the stratigraphic succession of the Salin basin but there is a lack of comprehensive analysis by seismic interpretation. This study provides a comprehensive description of the structural development within the Salin basin, enhancing our comprehension of the regional stratigraphic evolution of the examined region. Seismic sequences were delineated using a combination of horizon mapping, internal reflection configuration, termination patterns, and thickness analysis. We identified two distinct mechanisms for lateral fault seals: (1) primary juxtaposition seals and (2) secondary fault rock seals (also known as membrane seals). Once the hydrocarbons are matured within the source formations (Late Cretaceous to Early Oligocene shales units): Kabaw (KB); Laungshe (LA); Tabyin (TA); Pondaung (PO); Yaw (YA); and Shwezettaw (SZT), they are migrated towards the reservoir formations (Pondaung (PO), Shwezettaw (SZT), Padaung (PA), Okhmintaung (OHK), and Kyaukkok (KK)) through these predicted paths. Generally, the primary migration takes place along the fault or fractured planes or pores within rock units. In the southwestern limb of the Yenangyaung anticline, the disharmonic folding and upward bending of the KK, PY, OHK, and PA formations resulted in the deformation of ductile strata within the PA Formation, forcing them towards the peripheral synclines. The main deep fore-thrust in the southwestern limb of the Chauk anticline rooted within the PA Formation flattened up while approaching the OHK and PY formations. Chauk anticlinal axis above the PY and OHK detachment level are more migrated toward the northeast. As a result, above the crest of the deep anticline, the shallow low-angle fore-thrust pushed up into the growth strata, leading to the uplift of the YA and SZT formations within the Letpando anticline. YA Formation crops out locally along the axis of the structure and is the major seal, with sandstones in the underlying Eocene PO Formation being the main reservoir.</p>

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“…To the east of the Indo-Myanmar Ranges in Myanmar the Central Lowlands (Naing Maw Than et al 2017;Myint Thein & Maung Maung 2017), with a crystalline continental basement, are intruded by the Mesozoic-Cenozoic WunthoSalingyi-Popa Volcanic Arc . The basement is overlain by Cenozoic sediments, divided between forearc and back-arc basins by a line of volcanic crater lakes and eroded cinder cones with Mount Popa in the south and Taungthonlon in the north, representing part of a Quaternary volcanic arc which can be traced southwards through the Andaman Sea in the Narcondam and Barren islands into the Sunda Volcanic Arc in Sumatra and Java.…”

Section: Tectonic Setting Of Myanmarmentioning

confidence: 99%

Chapter 1 Introduction to the geology of Myanmar

Zaw

Swe

Barber³

et al. 2017

Memoirs

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Chapter 8 The Eastern (Back-arc) Basin of Central Myanmar: Basement rocks, lithostratigraphic units, palaeocurrents, provenance and developmental history

Cited by 16 publications

References 18 publications

Burma Terrane Collision and Northward Indentation in the Eastern Himalayas Recorded in the Eocene‐Miocene Chindwin Basin (Myanmar)

Burma Terrane Collision and Northward Indentation in the Eastern Himalayas Recorded in the Eocene‐Miocene Chindwin Basin (Myanmar)

Seismic stratigraphy and structural analysis in the determination of petroleum play within Salin basin, Myanmar

Chapter 1 Introduction to the geology of Myanmar

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