Age and provenance of the Chaung Magyi Group, Yeywa Dome, Myanmar, based on U-Pb dating of detrital zircons

Dew, Romana E.C.; Morley, Christopher; Myint, Tin Aung; Collins, Alan S.

doi:10.1016/j.jseaes.2019.103967

Cited by 12 publications

(5 citation statements)

References 17 publications

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“…For example, Xu et al (2013b) found that the Hf isotopic compositions of the 1200-900 Ma detrital zircons in the SCB are similar to the contemporaneous Hf isotopic compositions of zircons from northwestern Australia. Dew et al (2019Dew et al ( , 2021 used U-Pb and Hf signatures from Cambro-Ordovician detrital sequences in the Sibumasu Terrane to demonstrate Proterozoic Gondwanan provenance, which is also seen in the SCB. Additionally, the South China, Tarim, North China, Indochina and Sibumasu blocks all have Gondwanan Sino-Australian province faunas in the lower Palaeozoic strata, indicating these blocks were located on northeastern Gondwana adjacent to Australia (Metcalfe, 2011) The c. 1200-1000 Ma zircon grains are commonly found in Silurian-Ordovician sequences (Cawood & Nemchin, 2000;Markwitz et al 2017;Olierook et al 2019).…”

Section: A Provenance Of Upper Triassic and Lower Jurassic Samplesmentioning

confidence: 99%

U–Pb geochronology of Upper Triassic – Lower Jurassic detrital sequences from SE margin of the South China Block: implications for Palaeo-Pacific subduction and tectonic evolution

Kong

Tao

et al. 2022

Geol. Mag.

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We performed U–Pb dating of detrital zircons and conducted petrological and whole-rock geochemical analyses to assess the provenance of the Upper Triassic – Lower Jurassic clastic rocks in the southeastern margin of the South China Block. Detrital zircon U–Pb ages are mainly classified into age groups of 2000–1700, 900–700, 490–390 and 280–210 Ma, consistent with derivation from the Jiangnan orogenic belt, Nanling Belt, as well as Wuyi and Yunkai domains. Lower Jurassic samples yield a special main age population of 200–190 Ma, and these detrital zircon grains have low Th/U and Nb/Hf ratios and high Th/Nb and Hf/Th ratios, showing they are derived from a continental magmatic arc. However, the cross-correlation and likeness coefficients of kernel density estimates of Upper Triassic and Lower Jurassic sandstones are 0.8608 and 0.8403, indicating that their populations are highly similar. Since the tectonic setting is the key factor in controlling the relationship between source and sink, the stable supply of identical provenance suggests that the tectonic setting did not significantly change during Late Triassic – Early Jurassic time. Sandstone petrography, regional facies distribution and the detrital zircon age patterns all reflect a consistent tectonic setting for the South China Block during Late Triassic – Early Jurassic time. The Palaeo-Pacific subduction therefore did not control the tectonic evolution of the South China Block until after the Early Jurassic Epoch.

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Section: A Provenance Of Upper Triassic and Lower Jurassic Samplesmentioning

confidence: 99%

U–Pb geochronology of Upper Triassic – Lower Jurassic detrital sequences from SE margin of the South China Block: implications for Palaeo-Pacific subduction and tectonic evolution

Kong

Tao

et al. 2022

Geol. Mag.

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“…High‐grade regional metamorphic rocks comprising garnet + sillimanite gneisses and migmatites crop out to the SE of the Mogok valley but are poorly mapped. The surrounding rocks to the east comprise the Neoproterozoic‐Cambrian Chaung Magyi Group (Dew et al, 2019), although the nature of its contact with the Mogok metamorphic rocks is not known. Overlying the Chaung Magyi Group are the Cambrian‐Early Ordovician Pangyun Formation quartzites, sandstones, and siltstones and the Bawdwin volcanic series, which host the large Pb‐Zn‐(Cu‐Ag‐Ni) deposits at Bawdwin mine (Gardiner et al, 2017).…”

Section: Geology Of the Mogok Regionmentioning

confidence: 99%

Timing of Syenite‐Charnockite Magmatism and Ruby and Sapphire Metamorphism in the Mogok Valley Region, Myanmar

et al. 2020

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The Mogok metamorphic belt (MMB) extends for over 1,000 km along central Burma from the Andaman Sea to the East Himalayan syntaxis and represents exhumed lower and middle crustal metamorphic rocks of the Sibumasu plate. In the Mogok valley region, the MMB consists of regional high-grade marbles containing calcite + phlogopite + spinel + apatite ± diopside ± olivine and hosts world class ruby and sapphire gemstones. The coarse-grained marbles have been intruded by orthopyroxene-and clinopyroxene-bearing charnockite-syenite sheet-like intrusions that have skarns around the margins. Syenites range from hornblende-to quartz-bearing and frequently show layering that could be a primary igneous texture or a later metamorphic overprint. Calc-silicate skarns contain both rubies and blue sapphires with large biotites. Rubies occur in marbles with scapolite, phlogopite, graphite, occasional diopside, and blue apatite. Both marbles and syenites have been intruded by the Miocene Kabaing garnet-muscovite-biotite peraluminous leucogranite. New mapping and structural observations combined with U-Th-Pb zircon, monazite, and titanite geochronology from syenites, charnockites, leucogranites, meta-rhyolite-tuffs, and skarns have revealed a complex multiphase igneous and metamorphic history for the MMB. U-Pb zircon ages of the charnockite-syenites fall into three categories, Jurassic (170-168 Ma), latest Cretaceous to early Paleocene (~68-63 Ma), and late Eocene-Oligocene (44-21 Ma). New ages from five samples suggest that metamorphism in the presence of garnet and melt occurred between~45 and 24 Ma. U-Pb titanite ages from the ruby marbles and meta-skarns at Le Oo mine in the Mogok valley are 21 Ma, similar to titanite ages from an adjacent syenite (22 Ma). U-Th-Pb dating shows that all the metamorphic ages are Late Cretaceous-early Miocene and related to the India-Sibumasu collision.

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“…These granitoids are another possible source of Triassic zircons in sediments of the western Sibumasu Block in Myanmar. In addition, an active continental margin was developed along the northern part of the Sibumasu Block during the Neoproterozoic to Cambrian, based on detrital zircon study of metasedimentary rocks from the Chaung Magyi Group in Myanmar (Dew et al 2019). The granites and gneiss in the Sibumasu Block have inherited zircon core ages during the Proterozoic to Palaeozoic (particularly Neoproterozoic and Cambrian), suggesting the recycled material from protolith of granitoids (Dew et al 2018;Kanjanapayont et al 2020).…”

Section: C Sibumasu Block and Permian-triassic Hiatus In Igneous Activitymentioning

confidence: 99%

Revisiting the tectonic evolution of the Triassic Palaeo-Tethys convergence zone in northern Thailand inferred from detrital zircon U–Pb ages

et al. 2020

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Detrital zircon U–Pb ages for sediments in and around the Palaeo-Tethyan convergence zone in northern Thailand provide constraints for tectonic interpretations of the Indochina Block, the Sibumasu Block, the Inthanon Zone accretionary complex and the Nan Back-arc Basin during the Triassic. In sedimentary rocks of the Indochina Block, almost all of the Palaeozoic and Triassic zircons were sourced from the collision zone between the Indochina and South China blocks, and an active continental margin in the western Indochina Block. Sediments of the Sibumasu Block were supplied by erosion of Archaean basement and from the Grenville and the Pan African orogenies, but show no record of Permian to Triassic igneous activity. Accretionary complex sediments have provenances of both the Sukhothai Arc and the Indochina and South China blocks, with detrital zircons of various ages being supplied from crustal uplift and erosion related to the Indosinian I orogeny. Sedimentary rocks of the Nan Back-arc Basin are widely distributed not only in the Nan–Uttaradit but also in northern Sukhothai areas. The origin of the Pha Som Metamorphic Complex and associated formations can be traced to basin-filling sediments in the Nan Back-arc Basin. These detrital zircon U–Pb ages have also allowed identification of the changing tectonic setting in the Palaeo-Tethys convergence zone from the ‘erosion of Proterozoic continental basement’ to ‘Palaeozoic active continental margin in the western Indochina Block’ and ‘Palaeozoic, Permian to Triassic collision zone between the South China and Indochina blocks’ through to ‘Triassic active Sukhothai Arc’.

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Age and provenance of the Chaung Magyi Group, Yeywa Dome, Myanmar, based on U-Pb dating of detrital zircons

Cited by 12 publications

References 17 publications

U–Pb geochronology of Upper Triassic – Lower Jurassic detrital sequences from SE margin of the South China Block: implications for Palaeo-Pacific subduction and tectonic evolution

U–Pb geochronology of Upper Triassic – Lower Jurassic detrital sequences from SE margin of the South China Block: implications for Palaeo-Pacific subduction and tectonic evolution

Timing of Syenite‐Charnockite Magmatism and Ruby and Sapphire Metamorphism in the Mogok Valley Region, Myanmar

Revisiting the tectonic evolution of the Triassic Palaeo-Tethys convergence zone in northern Thailand inferred from detrital zircon U–Pb ages

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