Ar-Ar ages of gold deposits in the Song Hien domain (NE Vietnam): Tectonic settings and comparison with Golden Triangle in China in terms of a single metallogenic province

Nevolko, Peter A.; Tran, Tri; Yudin, D. S.; Ngo, Thi Phuong

doi:10.1016/j.oregeorev.2017.07.004

Cited by 22 publications

(10 citation statements)

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“…Abbreviations: DBPF: Dien Bien Phu Fault; NSZ: Nan Suture Zone; PKSZ: Poko Suture Zone; RRF: Red River Fault; SCF: Song Ca Fault; TKPSSZ: Tamky‐Phuoc Son Suture Zone. Metal deposits and reference 1: Song Hien (Au; Nevolko et al ., 2017); 2: Ban Huayxay (Au–Ag); 3: Phukham (Cu–Au; Kamvong et al ., 2014); 4: Phu Lon (Cu–Au); 5: Phu Thap Fa (Au; Kamvong et al ., 2014); 6: Phu Thep (Cu–Au; Kamvong et al ., 2014); 7: Chatree (Au–Ag; Salam et al ., 2014); 8: Sepon (Cu–Au; Cromie, 2010); 9: Phuoc Son (Au; Manaka, 2014); 10: Bong Mieu (Au; Tran et al ., 2014); 11: Xekong (Au); 12: Vangtat (Au)…”

Section: Introductionmentioning

confidence: 99%

“…Abbreviations: DBPF: Dien Bien Phu Fault; NSZ: Nan Suture Zone; PKSZ: Poko Suture Zone; RRF: Red River Fault; SCF: Song Ca Fault; TKPSSZ: Tamky-Phuoc Son Suture Zone. Metal deposits and reference 1: Song Hien (Au; Nevolko et al, 2017); 2: Ban Huayxay (Au-Ag); 3: Phukham (Cu-Au; Kamvong et al, 2014); 4: Phu Lon (Cu-Au); 5: Phu Thap Fa (Au; Kamvong et al, 2014); 6: Phu Thep (Cu-Au; Kamvong et al, 2014); 7: Chatree (Au-Ag; Salam et al, 2014); 8: Sepon (Cu-Au; Cromie, 2010); 9: Phuoc Son (Au; Manaka, 2014); 10: Bong Mieu (Au; Tran et al, 2014); 11: Xekong (Au); 12: Vangtat (Au) suture zone and associated structures (Lepvrier et al, 2004; Figure 1), including the Vangtat shear zone (Figure 2), which is the subject of this study as the host of a recently discovered orogenic gold belt in southeastern Laos (Figure 1; Bounliyong et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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K–Ar geochronology of orogenic gold mineralization in the Vangtat gold belt, southeastern Laos: Effect of excess argon in hydrothermal quartz

et al. 2021

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The Thongkai‐Ok gold deposit is one of several actively mined deposits in a newly discovered orogenic gold belt in southeastern Laos. At a district scale, gold mineralization occurs within the Vangtat shear zone, one of the tectonic structures of the Poko suture zone that marks the collision between the Indochina Terrane and the Kontum Massif in southern Laos‐central Vietnam. High grade gold mineralization is associated with quartz–pyrite–white mica veins and silicified zones up to 10 m thick, hosted by strongly deformed and sheared pelitic schist. Lower‐grade gold mineralization occurs in a graphite–carbonate–quartz–sulfide hydrothermal alteration envelope that grades into sub‐economic/barren altered pelitic schist. The objective of this study is to establish the age of mineralization in the Vangtat orogenic gold belt by K–Ar dating of hydrothermal white mica in the gold‐bearing quartz‐sulfide veins in order to better understand its spatial and temporal relation to other gold deposits in Southeast Asia and to regional tectonic events. Three‐white mica bearing quartz–pyrite samples were collected from the open pit at Thongkai‐Ok. The dominant white mica phase in the samples is 2M1 muscovite and the K2O content measured by electron microprobe techniques in individual white mica crystals ranged between 8.61 and 9.79 wt%. Two of the three vein samples were separated by gravity settling into four size fractions, <2, 2–4, 4–10, and 10–40 μm, respectively. The results of potassium measurements by flame photometry in the K–Ar sample aliquots show a range in potassium content which reflects the amount of quartz present in each sample as an impurity. With one exception, a correlation was observed between potassium concentration in the samples, including the size fraction separates, and the calculated K–Ar age. The large range of calculated ages, from 348 to 206 Ma, is interpreted to reflect excess argon contained in fluid inclusions in the hydrothermal quartz present in the analyzed samples. We interpret the youngest age of the quartz‐free samples, 206 ± 4 Ma, as closest to the age of mineralization in the Vangtat gold belt. The age could be as young as ~170 Ma if the age versus potassium content relation is extrapolated to the average potassium content of white mica in the samples analyzed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

K–Ar geochronology of orogenic gold mineralization in the Vangtat gold belt, southeastern Laos: Effect of excess argon in hydrothermal quartz

et al. 2021

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“…These field relationships indicate that the Carlin-like gold deposits in the Youjiang Basin formed between Early Jurassic and Late Cretaceous [13]. Consistent with these crosscutting relationships, various hydrothermal minerals isotopic dating data constrain the age of the gold mineralization to a wide range between 193 Ma and 141 Ma [10,18,75,76]. As mentioned above, the gold mineralization in the Youjiang Basin has long been considered to be related to the deep magmatism, either the ore-forming elements derived from magma or the ore-forming hydrothermal fluid was driven by magma [9,12,13,16].…”

Section: Implications For the Carlin-like Gold Mineralization In The ...mentioning

confidence: 71%

“…(a) Tectonic framework of East Asia (revised after[17]). (b) Simplified regional geological map of the Youjiang Basin and adjacent areas (after[10,18]) and 1:500,000 geological map of central South China made by the Chinese Academy of Geological Sciences in 2012). YJB = Youjiang Basin.…”

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confidence: 99%

Early Jurassic Mafic Intrusions in the Southern Youjiang Basin, SW China: Petrogenesis, Tectonic and Metallogenic Implications

et al. 2019

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A suite of mafic intrusions, composed of diabase and micro-gabbro outcrops in the Jingxi area of southern Youjiang Basin, SW China. This study conducts geochronological, geochemical, and Sr–Nd isotopic analyses on the mafic intrusions in Jingxi with the aim of determining their petrogenesis, tectonic setting, and metallogenic implications. Zircon U–Pb dating for the mafic intrusions yielded an age of 183 ± 3 Ma (MSWD = 2.3), which is coeval with the Carlin-like gold mineralization in the Youjiang Basin. The mafic intrusions are alkaline in composition and characterized by low TiO2 (1.25–1.87 wt %) contents and low Ti/Y ratios (410–550). They exhibit OIB-like patterns of trace element distribution and they have low (87Sr/86Sr)i ratios of 0.704341 to 0.705677, slightly negative εNd(t) values of −0.30 to −2.16, low La/Ta (11.57–15.66) and La/Nb (0.77–1.06) ratios, with [La/Yb]N = 6.52–10.63. The geochemical characteristics, combined with regional considerations, suggest that the mafic intrusions originated from partial melting of upwelling asthenosphere within the garnet-spinel transition zone, as a result of intracontinental back-arc extension triggered by the steep subduction of the Paleo-Pacific plate beneath the South China Block. Moreover, the new data not only suggest Early Jurassic magma was a possible heat source, but also support a magmatism-related model for the Carlin-like gold mineralization in the Youjiang Basin.

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“…Some deposits that have been described as SHG type, such as Selingsing, Malaysia (Makoundi et al, ); Langu in southern Thailand (Wilkinson, ); the Thai antimony‐gold occurrences around Lampang and Rayong (Gardiner, ; Shawe, ; Dill et al, ); and the central and northern Vietnamese examples at Lang Vai, Ta Nang, Bo Va, Khung Khaong, and Tham Riem (Hoa et al, , Anh et al ., ; Nevolko et al, , b, ), are thought to be orogenic mineralization styles. Thus, they are not considered to have the same specific characteristics as the SHG examples documented in this paper.…”

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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Ar-Ar ages of gold deposits in the Song Hien domain (NE Vietnam): Tectonic settings and comparison with Golden Triangle in China in terms of a single metallogenic province

Cited by 22 publications

References 56 publications

K–Ar geochronology of orogenic gold mineralization in the Vangtat gold belt, southeastern Laos: Effect of excess argon in hydrothermal quartz

K–Ar geochronology of orogenic gold mineralization in the Vangtat gold belt, southeastern Laos: Effect of excess argon in hydrothermal quartz

Early Jurassic Mafic Intrusions in the Southern Youjiang Basin, SW China: Petrogenesis, Tectonic and Metallogenic Implications

Sediment‐Hosted Gold Deposits in Southeast Asia

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