Constraining the links between the Himalayan belt and the Central Myanmar Basins during the Cenozoic: An integrated multi-proxy detrital geochronology and trace-element geochemistry study

Arboit, Francesco; Ratschbacher, Lothar; Chew, David; Mitchell, A. H. G.; Drost, Kerstin; Badenszki, Eszter; Daly, J. Stephen

doi:10.1016/j.gsf.2020.05.024

Cited by 20 publications

(27 citation statements)

References 113 publications

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“…For these reasons, we propose that the exhuming northernmost perpetuation of the WPA, forming a segment of the Trans-Tethyan Arc in the Greater Burma region, should have significantly contributed to the late Eocene sediment supply of central Myanmar alongside the Wuntho Ranges (Figure 11a). 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).…”

Section: Sedimentary Provenance 531 Yaw Formationmentioning

confidence: 99%

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: 99%

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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“…(2013, 2018), Arboit et al. (2021), Bender (1983), Htut (2017), and Zhang et al. (2021) and References therein.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Hf‐isotope characterization of these Mesozoic‐Cenozoic grains allows for discrimination between zircons from the WPA, which have positive εHf values, as opposed to grains of similar age from the MMB, which have negative values (Wang et al., 2014). Other techniques have included rutile U‐Pb analyses, with Cenozoic grains interpreted as derived from the MMB (Zhang et al., 2021), and rutile geochemistry to assess metamorphic grade (Arboit et al., 2021). Arboit et al.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Arboit et al. (2021) additionally suggest the possibility of some Himalayan input, delivered by the Bengal Fan/longshore drift.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…First we research the provenance of the CMB, using it to determine when Asian material first arrived on the WBT and thus place constraints on when the two blocks collided. Previous work has proposed first arrival of Asian material into the CMB in late Eocene times (Licht et al., 2018), Oligocene times (Arboit et al., 2021; Zhang et al., 2021) or not until the Miocene (Westerweel et al., 2020). Second, we determine the timing of uplift of the IBR, exhumation of which has been debatably linked to collision of the WBT with India (e.g., Aitchison et al., 2007; Morley, 2009; Morley et al., 2020; Verard et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

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The Timing of Collision Between Asia and the West Burma Terrane, and the Development of the Indo‐Burman Ranges

Najman

Sobel

Millar³

et al. 2022

Tectonics

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The West Burma Terrane (WBT) is a small terrane bounded to the east by the Asian Sibumasu Block and to the west by the Indo‐Burman Ranges (IBR), the latter being an exhumed accretionary prism that formed during subduction of Indian oceanic lithosphere beneath Asia. Understanding the geological history of the WBT is important for reconstruction of the closure history of the Tethys Ocean and India‐Asia collision. Currently there are major discrepancies in the proposed timings of collision between the WBT with both India and Asia; whether the WBT collided with India or Asia first is debated, and proposed timings of collisions stretch from the Mesozoic to the Cenozoic. We undertook a multi‐technique provenance study involving petrography, detrital zircon U‐Pb and Hf analyses, rutile U‐Pb analyses and Sr‐Nd bulk rock analyses on sediments of the Central Myanmar Basins of the WBT. We determined that the first arrival of Asian material into the basin occurred after the earliest late Eocene and by the early Oligocene, thus placing a minimum constraint on the timing of WBT‐Asia collision. Our low temperature thermochronological study of the IBR records two periods of exhumation, in the early‐middle Eocene, and at the Oligo‐Miocene boundary. The Eocene event may be associated with the collision of the WBT with India. The later event at the Oligo‐Miocene boundary may be associated with changes in wedge dynamics resulting from increased sediment supply to the system; however a number of other possible causes provide equally plausible explanations for both events.

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Timing and tectonic setting of tin mineralization in southern Myanmar: constraints from cassiterite and wolframite U–Pb ages

Zhang

Zhao

et al. 2021

Miner Deposita

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The southern Myanmar tin ore district is an important part of the well-known Southeast Asia tin belt (SATB), and hosts numerous economically important primary tin-tungsten ore deposits.However, the timing of formation of these deposits is unclear due to the scarcity of robust age data. The tectonic setting of tin mineralization in this area also needs to be further constrained.Most of the primary tin-tungsten ore deposits in southern Myanmar are typical hydrothermal quartz vein-type, with cassiterite and wolframite as the main ore minerals. Here, we present in situ U-Pb ages of cassiterite and wolframite from nine granite-related hydrothermal Sn-W deposits in southern Myanmar. Cassiterite samples from the Hermyingyi, Thitkhatoe, Thaling Taung, Kalonta, Taungphila, Pagaye, Bawapin, Kanbauk, and Letha Taung deposits yield common lead-corrected weighted mean 206Pb/238U ages of 61.

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Constraining the links between the Himalayan belt and the Central Myanmar Basins during the Cenozoic: An integrated multi-proxy detrital geochronology and trace-element geochemistry study

Cited by 20 publications

References 113 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)

The Timing of Collision Between Asia and the West Burma Terrane, and the Development of the Indo‐Burman Ranges

Timing and tectonic setting of tin mineralization in southern Myanmar: constraints from cassiterite and wolframite U–Pb ages

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