Late Triassic volcanic activity in South-East Asia: New stratigraphical, geochronological and paleontological evidence from the Luang Prabang Basin (Laos)

Blanchard, Sébastien; Rossignol, Camille; Bourquin, Sylvie; Dabard, Marie‐Pierre; Hallot, Erwan; Nalpas, Thierry; Poujol, Marc; Battail, Bernard; Jalil, Nour‐Eddine; Steyer, Jean‐Sébastien; Vacant, Renaud; Véran, Monette; Bercovici, Antoine; Diez, José B.; Paquette, Jean‐Louis; Khenthavong, Bounxou; Vongphamany, Sotsy

doi:10.1016/j.jseaes.2013.02.024

Cited by 20 publications

(12 citation statements)

References 30 publications

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“…Qian et al (2016) presented new geochronological and geochemical data from the Luang Prabang zone that indicates that the mafic rocks in this zone are Carboniferous in age (335.5 ± 3.3 Ma for a diabase dyke and 304.9 ± 3.9 Ma for basalt) and that the mafic rocks represent a continental back-arc basin which they correlate with the Nan-Uttaradit suture to the SW and the Jinshajiang-Ailaoshan suture zone to the north. Blanchard et al (2013) and Rossignol et al (2016) present evidence from the Luang Prabang Basin in Laos for a Triassic magmatic arc and they correlate the Luang Prabang Suture with the Nan-Uttaradit Suture. Rossignol et al (2016) also indicate that the Luang Prabang Suture is contiguous with the Ailaoshan Suture in Yunnan and considered the Sukhothai Arc of Sone & Metcalfe (2008) to be part of the Simao Block.…”

Section: Luang Prabang Suture Zonementioning

confidence: 90%

Tectonic evolution of Sundaland

Metcalfe¹

2017

BGSM

193

139

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Section: Luang Prabang Suture Zonementioning

confidence: 90%

Tectonic evolution of Sundaland

Metcalfe¹

2017

BGSM

193

139

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“…Volcaniclasts, occurring either as polyphazed rock fragments (glass ± crystals ± vesicles) or as individual fragments made by a single phase (glass or crystal), commonly contain minerals suitable for radiometric dating, such as zircon. Consequently, volcaniclastic rocks are widely used to provide radiometric ages for sedimentary series and/or to calibrate the temporal extent of fossils (biozones) and generate chronostratigraphic charts (e.g., Lehrmann et al, 2006;Ovtcharova et al, 2006;Yu et al, 2008;Shen et al, 2011;Blanchard et al, 2013;Rubidge et al, 2013;Gastaldo et al, 2015;Metcalfe et al, 2015;Schoene et al, 2015;Baresel et al, 2017). However, linking a radiometric age obtained from a volcaniclastic rock with the age of sedimentation is not straightforward.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…one sample every ten meters) would result in smaller reworking durations. However, as sedimentation rates in volcaniclastic environments are highly variable, ranging from a few meters to thousands of meters per Ma (e.g., Allen et al, 2007;Xie and Heller, 2009;Blanchard et al, 2013)…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Using volcaniclastic rocks to constrain sedimentation ages: To what extent are volcanism and sedimentation synchronous?

Rossignol

Hallot

Bourquin

et al. 2019

Sedimentary Geology

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“…The Late Permian to Early Triassic volcanic rocks are exposure around Luang Prabang [38], and to the west of Phetchabun [33]. The Middle-Late Triassic volcanic rocks are confined to the southwest of Luang Prabang [39], or around Luang Prabang [40]. The intrusive rocks, dominated by Triassic island arc I-type granitoids [32,41], are normally distributed to the northeast of Luang Prabang and around Pak Lay in Laos, and in Loei Province of Thailand.…”

Section: Regional Geologymentioning

confidence: 99%

Rare Earth Elements Geochemistry and C–O Isotope Characteristics of Hydrothermal Calcites: Implications for Fluid-Rock Reaction and Ore-Forming Processes in the Phapon Gold Deposit, NW Laos

et al. 2018

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The Phapon gold deposit is located in the northern Laos and the northern segments of the Luang Prabang–Loei metallogenic belt. The lode-gold orebodies consist of auriferous calcite veins in the middle, and the surrounding siderite alteration and hematite alteration zones in red color. This deposit is hosted in Lower Permian limestone and controlled by a NE-trending ductile–brittle fault system, and it is characterized by the wallrock alteration of carbonatization and lack of quartz and metal sulfides. The hydrothermal calcite from auriferous calcite veins and red alteration zone, as well as the wall rocks of limestone and sandstone were selected for rare earth elements (REE) and C–O isotope analyses. The two types of calcite and limestone have generally consistent REE patterns and δEu and δCe values, which are completely different from those of sandstone. Calcites from the auriferous vein show slight light rare earth elements (LREE)-depleted patterns and higher Tb/La and Sm/Nd ratios than the ones from the red alteration zone with slight LREE-enriched patterns. These values indicate that the calcites from the auriferous veins and the red alteration zones are products of homologous fluids, but the former ones are generally likely to form later than the latter ones. The hydrothermal calcites have C–O isotope compositions within the range of marine carbonate, and markedly different from the magmatic or mantle reservoir values. Taking the Y/Ho–La/Ho and Tb/Ca–Tb/La variations into consideration, we believe the hydrothermal calcites could be formed from remobilization and recrystallization of the ore-hosted limestone, and the fluid-wallrock interaction played a major role in the gold mineralization in Phapon. In combination with the regional and local geology, the ore-forming process is suspected to be primarily associated with dehydration and decarbonisation of the Lower Permian limestone and Middle–Upper Triassic sandstones. The Phapon gold deposit could have been formed during the Late Triassic–Jurassic regional dynamic metamorphism driven by Indochina–Sibumasu post-collisional magmatism. A number of features in Phapon are similar to epizonal orogenic deposit, but it is still a unique calcite vein type gold deposit in the Luang Prabang-Loei metallogenic belt.

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Late Triassic volcanic activity in South-East Asia: New stratigraphical, geochronological and paleontological evidence from the Luang Prabang Basin (Laos)

Cited by 20 publications

References 30 publications

Tectonic evolution of Sundaland

Tectonic evolution of Sundaland

Using volcaniclastic rocks to constrain sedimentation ages: To what extent are volcanism and sedimentation synchronous?

Rare Earth Elements Geochemistry and C–O Isotope Characteristics of Hydrothermal Calcites: Implications for Fluid-Rock Reaction and Ore-Forming Processes in the Phapon Gold Deposit, NW Laos

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