Evidence for Ordovician subduction-related magmatism in the Truong Son terrane, SE Laos: Implications for Gondwana evolution and porphyry Cu exploration potential in SE Asia

Gardner, C. J.; Graham, Ian T.; Белоусова, Е. А.; Booth, G.W.; Greig, Alan

doi:10.1016/j.gr.2016.11.003

Cited by 39 publications

(33 citation statements)

References 34 publications

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“…Diorite and rhyolitic tuff yields zircon U-Pb ages of 470 ± 2 Ma and 476 ± 1.5 Ma, respectively (Gardner et al, 2017). West of Quang Binh province near the Vietnam-Laos boundary, arcaffinity calc-alkaline granodiorite and granite of the Vit Thu Lu complex with zircon U-Pb age of 475 ± 5 Ma intruded into the Long Dai Fm.…”

Section: Indochina Composite Terranementioning

confidence: 99%

“…About 50 km west of the Po Ko fault in Laos, diorite and rhyolitic rocks were mapped in the Donken area ( Figure 1) with whole-rock geochemistry compatible with an island arc setting. These rocks are dated as 477-470 Ma (Early Ordovician) using zircon U-Pb Q-ICP-MS (Gardner et al, 2017). Gardner et al (2017) interpreted their occurrence to be associated with bivergent subduction of the Tam Ky Phuoc Son ocean under both the Kon Tum terrane and the Viet-Lao terrane.…”

Section: Po Ko Suturementioning

confidence: 99%

“…The subduction might also have been directed southward, as suggested by the Nui Vu and Phong Hanh volcano-plutonic arc complex (Figures. 2, 3 & 12B) (Gardner et al, 2017;Tran et al, 2014., Tran, 1998Tran and Vu, 2011, pp. 59-60).…”

Section: Middle Cambrian-early Ordovician Evolutionmentioning

confidence: 99%

“…In the Indochina composite terrane, possible bivergent subduction of the Tam Ky-Phuoc Son ocean underneath the Kon Tum terrane, Viet-Lao terrane, and Viet-Cambodia terrane (470-450 Ma) has been suggested (Gardner et al, 2017). This was followed by an Ordovician continental collision (450-425 Ma) that caused high-grade metamorphism and widespread migmatisation in the Kon Tum massif.…”

Section: Middle Ordovician-silurian Evolutionmentioning

confidence: 99%

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Neoproterozoic to Early Triassic tectono-stratigraphic evolution of Indochina and adjacent areas: A review with new data

Tran

Faure

Nguyen

et al. 2020

Journal of Asian Earth Sciences

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Section: Indochina Composite Terranementioning

confidence: 99%

Section: Po Ko Suturementioning

confidence: 99%

Section: Middle Cambrian-early Ordovician Evolutionmentioning

confidence: 99%

Section: Middle Ordovician-silurian Evolutionmentioning

confidence: 99%

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Neoproterozoic to Early Triassic tectono-stratigraphic evolution of Indochina and adjacent areas: A review with new data

Tran

Faure

Nguyen

et al. 2020

Journal of Asian Earth Sciences

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“…To the north, an east–west‐trending regional thrust, known as the Danang‐Khe Sanh suture zone, separates two major tectonic blocks: the Truong Son and Xekong‐Attapeu fold belts (Lepvrier et al, ). The Xekong‐Attapeu fold belt may be an offset extension of the Truong Son fold belt (Gardiner et al, ). Small sericite‐altered quartz porphyry stocks and dykes occur throughout the Ban Bak area.…”

Section: Deposit Examples: Laosmentioning

confidence: 99%

Sediment‐Hosted Gold Deposits in Southeast Asia

Kirwin

Royle²

2018

Resource Geology

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Sediment-hosted gold (SHG) deposits are becoming more widely recognized in the Southeast Asian region. They are characterized by very fine-grained gold, typically occurring in stratabound jasperoid replacement and structurally controlled orebodies in calcareous or carbonaceous sedimentary rocks, which are commonly distal to porphyry copper-gold deposits. Gold mineralization is associated with anomalous As-Sb-Hg-Tl and is normally concentrated in the arsenic-rich rims of pyrite and arsenopyrite grains (commonly refractory). The examples discussed in this paper are located in Southeast Asian countries, and all occur in island or continental arc terrains. SHG deposits have many features comparable to the Carlin deposits in Nevada; however, they differ in tectonic setting, their shallow level of emplacement, fluid composition, and probable metal source. As such, the Southeast Asian examples described in this compilation may be classified as "Carlin-like" but not "Carlin-type." Furthermore, they appear to represent a subclass of low-temperature epithermal deposits, with most occurrences showing late-stage colloform quartz vein events. Indeed, they are better described as sediment-hosted epithermal gold deposits. Several examples are multimillion ounce deposits, such as Sepon, Laos, with its endowment of more than 4 million ounces of gold. Mesel, Sulawesi, and Bau (Jugan and Tai Parit), Sarawak, also possessed multimillion ounce resources prior to mining. Two centuries of Chinese alluvial and eluvial mining at Buduk in northwest Kalimantan has produced a significant unrecorded amount of gold. Structurally controlled feeder zones frequently contain higher-grade gold mineralization (e.g. Mesel), and constitute valid exploration targets. More recently discovered deposits, such as those in Myanmar (Gegalaw, Taungzaw, and Katsena) and the Philippines (Hijo and Las Cogon), remain to be thoroughly explored. Most of the deposits (Sepon, Mesel, Abong, Sihayo, Jugan, Tai Parit, Hijo, and Lascogon) can be directly linked spatially and genetically to gold-copper porphyry intrusive centers. It is postulated that localities with no obvious connection to known porphyry deposits (Buduk, Ban Bak, Kyaukpahto, Gegalaw, Taungzaw, and Katsena) may represent district-scale exploration targets for porphyry copper-gold deposits. In terms of discovery techniques, of the 13 SHG deposits discussed here, several were sites of historical mining (Mesel, Bau, and Kyaukpahto). The majority, however, are virgin deposits discovered in the past 25 years by intuitive area selection followed by systematic regional geochemical exploration programs and routine geological inspections. At the project scale, electrical resistivity techniques, such as controlled-source audio frequency magnetotellurics (CSAMT) and induced polarization (IP), have proven to be useful for mapping blind jasperoid bodies and associated feeder zones and silicified structures. Traditional field mapping and stream float sampling in tropical regions are also effective exploration tools. ...

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Ordovician continental arc magmatism in the Tam Ky‐Phuoc Son Suture Zone, Central Indochina Block, Southeast Asia

et al. 2022

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The Indochina Block is considered as a part of the Indian and Australian margins of Gondwana, and the Tam Ky-Phuoc Son Suture Zone (TPSZ) lies in its central region as the boundary between the Truong Son Belt and Kon Tum Massif (KTM). However, the early Palaeozoic tectonic nature and timing of magmatism within the TPSZ are still controversial. To tackle the issue, we present herein the zircon U-Pb ages with their trace-element compositions of five dioritic-granitic granitoids in the TPSZ.U-Pb age dating of magmatic zircons from them suggests emplacement ages of ca. 447-450 Ma. Whole-rock geochemistry of the samples shows low TiO 2 contents (0.36-1.18 wt%) and Mg# (42.04-53.07). They display enrichment in light rare earth elements ([La/Yb] N = 4.10-15.19), pronounced negative Nb, Ta and Ti anomalies relative to the chondrite-normalized rare earth element patterns and primitive mantlenormalized trace-element distribution diagrams. The whole-rock geochemical characteristics together with zircon trace-element compositions from the same samples revealed their petrogenesis of a continental arc tectonic setting. Combining the results from this study together with available data from the TPSZ and its neighbouring units, we suggest accretionary orogenesis was responsible for generation of the Ordovician magmatic arc in the KTM, which will provide better understanding of the Early Palaeozoic evolution of the eastern Indochina Block.

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Evidence for Ordovician subduction-related magmatism in the Truong Son terrane, SE Laos: Implications for Gondwana evolution and porphyry Cu exploration potential in SE Asia

Cited by 39 publications

References 34 publications

Neoproterozoic to Early Triassic tectono-stratigraphic evolution of Indochina and adjacent areas: A review with new data

Neoproterozoic to Early Triassic tectono-stratigraphic evolution of Indochina and adjacent areas: A review with new data

Sediment‐Hosted Gold Deposits in Southeast Asia

Ordovician continental arc magmatism in the Tam Ky‐Phuoc Son Suture Zone, Central Indochina Block, Southeast Asia

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