New insights through LA-ICP-MS and sulphur isotope investigations into the occurrence of gold in the Sepon gold deposits, Laos

Cromie, Paul; Smith, Sean G. W.; Zaw, Khin

doi:10.1071/aseg2006ab028

Cited by 7 publications

(15 citation statements)

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“…Geochronological and geochemical analyses indicate that mineralization-related volcano-plutonic rocks were formed ca. 270-300 Ma, showing calc-alkaline affinity (Tate, 2005;Cromie et al, 2006;Hotson, 2009;Li, 2012;Manaka et al, 2008Manaka et al, , 2014Wang et al, 2013;Zaw et al, 2014). Kamvong et al (2014) concluded that incipient arc magmatism in the Truong Son terrane was one of the intense driving forces for the formation of largest metal deposits in the region.…”

Section: Tectono-magmatic-metallogenic Evolution In the Truong Son Tementioning

confidence: 92%

“…1; Table 3). Geochemical research results of the mineralization-related intrusions indicate a continental arc setting and those deposits mainly controlled by cal-alkaline volcano-intrusive magmatism (Backhouse, 2004;Cromie et al, 2006Cromie et al, , 2010Manaka et al, 2008;Li, 2012;Kamvong et al, 2014).…”

Section: Geochronological Framework Of the Truong Son Magmatic Beltmentioning

confidence: 96%

“…1), where basic geological survey is relatively lower than Vietnam, and were concentrated on the large-scale metal deposits which associated with magmatism, metamorphism and tectonic deformation. For example, the U-Pb zircon and Re-Os ages of diorite intrusions from the KTL-Bohr Thong-Tharkhek and the Phu Kham Cu-Au mine area are 277-290 Ma (Hotson, 2009) and 299-306 Ma (Backhouse, 2004;Tate, 2005;Kamvong et al, 2014), respectively in central Laos; Granodiorite porphyry developed in the Sepon Cu-Au mine area was at the U-Pb age of 290 Ma (Cromie et al, 2006); mozongranite and granodiorite from the Pha Lek Fe mine area was at the U-Pb age of 280-317 Ma (Li, 2012;Wang et al, 2013); and feldspar-phyric andesite and crystal-rich volcanic breccia from the Ban Houayxai Au-Ag mine area gained a U-Pb age of 260-290 Ma (Fig. 1; Table 3).…”

Section: Geochronological Framework Of the Truong Son Magmatic Beltmentioning

confidence: 98%

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Zircon U–Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications

Shi

Lin

et al. 2015

Journal of Asian Earth Sciences

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Section: Tectono-magmatic-metallogenic Evolution In the Truong Son Tementioning

confidence: 92%

Section: Geochronological Framework Of the Truong Son Magmatic Beltmentioning

confidence: 96%

Section: Geochronological Framework Of the Truong Son Magmatic Beltmentioning

confidence: 98%

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Zircon U–Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications

Shi

Lin

et al. 2015

Journal of Asian Earth Sciences

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“…The infered Permian age of gold mineralization at both Sepon and Ban Bak is noticably older than all other SHG deposits in Southeast Asia, which are Neogene (5–20 Ma) in age. Geochronology studies at Sepon indicate an age of 280–287 Ma for intrusion‐related mineralization spacially associated with the SHG deposits (Cromie, ).…”

Section: Deposit Examples: Laosmentioning

confidence: 99%

“…These include Lascogon (Maglambayan et al, ) and Hijo (Culala, ; Sajona, ; Kirwin, ), eastern Mindanao, Abong (McLean, 2008, written comm.) and Pungkut (http://www.sihayogold.com/), Sumatra, Mesel, Sulawesi (Farmer & Hendri, ), Jugan and Tai Parit, and Sarawak (Shuch, ) and Sepon, Laos (Cromie, ). At other deposits, such as Kyaukpahto, Gegalaw, and Taungzaw, Myanmar (Mitchell et al, ; Gardiner et al, ), and Ban Bak, Laos (Birt and Owler, 2013, written comm.…”

Section: Introductionmentioning

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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Geochemistry of Au-bearing pyrite from the Sepon Mineral District, Laos DPR, Southeast Asia: Implications for ore genesis

Cromie

Makoundi

Zaw

et al. 2018

Journal of Asian Earth Sciences

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New insights through LA-ICP-MS and sulphur isotope investigations into the occurrence of gold in the Sepon gold deposits, Laos

Cited by 7 publications

References 0 publications

Zircon U–Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications

Zircon U–Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications

Sediment‐Hosted Gold Deposits in Southeast Asia

Geochemistry of Au-bearing pyrite from the Sepon Mineral District, Laos DPR, Southeast Asia: Implications for ore genesis

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