Provenance and origins of a Late Paleozoic accretionary complex within the Khangai–Khentei belt in the Central Asian Orogenic Belt, central Mongolia

Hara, Hidetoshi; Kurihara, Toshiyuki; Tsukada, Kazuhiro; Kon, Yoshiaki; Uchino, Takayuki; Suzuki, Toshiya; Takeuchi, Makoto; Nakane, Yuki; Nuramkhaan, Manchuk; Minjin, Chuluun

doi:10.1016/j.jseaes.2013.07.019

Cited by 25 publications

(14 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The NKGB is considered to have formed by granitoid intrusive activity during the final closure of the Mongol-Okhotsk Ocean by the collision along the Mongol-Okhotsk belt in the middle Triassic to middle Jurassic (Zorin et al, 2001;Dril et al, 2010;Gordienko et al, 2012;Goldfarb et al, 2013;Hara et al, 2013). The NE trending NKGB is hosted in the Haraa terrane, which is bounded by the Bayangol and the Yeroogol fault systems (Fig.…”

Section: Geological Outline 21 Regional Geologymentioning

confidence: 99%

Gold Mineralization of the Gatsuurt Deposit in the North Khentei Gold Belt, Central Northern Mongolia

et al. 2014

View full text Add to dashboard Cite

Mineral assemblages, chemical compositions of ore minerals, wall rock alteration and fluid inclusions of the Gatsuurt gold deposit in the North Khentei gold belt of Mongolia were investigated to characterize the gold mineralization, and to clarify the genetic processes of the ore minerals. The gold mineralization of the deposit occurs in separate Central and Main zones, and is characterized by three ore types: (i) low-grade disseminated and stockwork ores; (ii) moderate-grade quartz vein ores; and (iii) high-grade silicified ores, with average Au contents of approximately 1, 3 and 5 g t −1 Au, respectively. The Au-rich quartz vein and silicified ore mineralization is surrounded by, or is included within, the disseminated and stockwork Au-mineralization region. The main ore minerals are pyrite (pyrite-I and pyrite-II) and arsenopyrite (arsenopyrite-I and arsenopyrite-II). Moderate amounts of galena, tetrahedrite-tennantite, sphalerite and chalcopyrite, and minor jamesonite, bournonite, boulangerite, geocronite, scheelite, geerite, native gold and zircon are associated. Abundances and grain sizes of the ore minerals are variable in ores with different host rocks. Small grains of native gold occur as fillings or at grain boundaries of pyrite, arsenopyrite, sphalerite, galena and tetrahedrite in the disseminated and stockwork ores and silicified ores, whereas visible native gold of variable size occurs in the quartz vein ores. The ore mineralization is associated with sericitic and siliceous alteration. The disseminated and stockwork mineralization is composed of four distinct stages characterized by crystallization of (i) pyrite-I + arsenopyrite-I, (ii) pyrite-II + arsenopyrite-II, (iii) galena + tetrahedrite + sphalerite + chalcopyrite + jamesonite + bournonite + scheelite, and iv) boulangerite + native gold, respectively. In the quartz vein ores, four crystallization stages are also recognized: (i) pyrite-I, (ii) pyrite-II + arsenopyrite + galena + Ag-rich tetrahedrite-tennantite + sphalerite + chalcopyrite + bournonite, (iii) geocronite + geerite + native gold, and (iv) native gold. Two mineralization stages in the silicified ores are characterized by (i) pyrite + arsenopyrite + tetrahedrite + chalcopyrite, and (ii) galena + sphalerite + native gold. Quartz in the disseminated and stockwork ores of the Main zone contains CO2-rich, halitebearing aqueous fluid inclusions with homogenization temperatures ranging from 194 to 327°C, whereas quartz in the disseminated and stockwork ores of the Central zone contains CO2-rich and aqueous fluid inclusions with homogenization temperatures ranging from 254 to 355°C. The textures of the ores, the mineral assemblages present, the mineralization sequences and the fluid inclusion data are consistent with orogenic classification for the Gatsuurt deposit.

show abstract

Section: Geological Outline 21 Regional Geologymentioning

confidence: 99%

Gold Mineralization of the Gatsuurt Deposit in the North Khentei Gold Belt, Central Northern Mongolia

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The sandstones of the accretionary complex and overlying formation in the Ulaanbaatar terrane (Fig. 5a, b, e.g., Bussien et al 2011;Hara et al 2013;Suzuki et al 2012) are located in the "Basement uplift" and "Volcanic arc" fields in the Q-F-Lt diagram (Dickinson et al 1983), as is the coeval sandstone of the Örmögtei Formation in the Haraa terrane. The sandstone of the Örmögtei Formation includes detrital zircon, most of which yields an U-Pb age of ~360-330 Ma Kelty et al 2008).…”

Section: Tectonic Implication Of the Low-angle Southward-dipping Thrustmentioning

confidence: 99%

“…The Ulaanbaatar terrane is a late Devonian-Early Carboniferous accretionary complex (Kurihara et al 2009). Several authors (e.g., Zorin 1999;Dorjsuren et al 2006;Kurihara et al 2009;Bussien et al 2011;Gordienko et al 2012;Takeuchi et al 2012;Hara et al 2013;Purevjav and Roser 2013;Ruppen et al 2013;Tsukada et al 2013) have been studied the lithology, stratigraphy, geological structure, geochemistry, and age of the rocks in the Paleozoic accretionary complexes of the HD belt. Detrital zircons in the sandstone of the accretionary complex of the Ulaanbaatar terrane mostly yield U-Pb ages of ~350-320 Ma (e.g., Kröner et al 2007;Kelty et al 2008;Bussien et al 2011;Hara et al 2013).…”

Section: Tectonic Implication Of the Low-angle Southward-dipping Thrustmentioning

confidence: 99%

“…Several authors (e.g., Zorin 1999;Dorjsuren et al 2006;Kurihara et al 2009;Bussien et al 2011;Gordienko et al 2012;Takeuchi et al 2012;Hara et al 2013;Purevjav and Roser 2013;Ruppen et al 2013;Tsukada et al 2013) have been studied the lithology, stratigraphy, geological structure, geochemistry, and age of the rocks in the Paleozoic accretionary complexes of the HD belt. Detrital zircons in the sandstone of the accretionary complex of the Ulaanbaatar terrane mostly yield U-Pb ages of ~350-320 Ma (e.g., Kröner et al 2007;Kelty et al 2008;Bussien et al 2011;Hara et al 2013). The rocks of the accretionary complex are unconformably overlain by formations yielding Carboniferous brachiopods (e.g., Minjin et al 2006;Kurihara et al 2009;Takeuchi et al 2012), and it can thus be inferred from the ages of the detrital zircon and overlying formation that the clastic rocks of the accretionary complex should be assigned to the Carboniferous.…”

Section: Tectonic Implication Of the Low-angle Southward-dipping Thrustmentioning

confidence: 99%

“…These have been interpreted as showing that the folds and thrusts in these terranes were formed in relation to northward subduction of the previous oceanic plate beneath the continental crust (e.g., Kurihara et al 2009;Gordienko et al 2012;Takeuchi et al 2012;Ruppen et al 2013). Kurihara et al (2009) proposed that the accretion process may have taken place between the late Devonian and Early Carboniferous, and Hara et al (2013) inferred the accretion age of the clastic rocks as Early Carboniferous, based on the U-Pb age of detrital zircon in the Ulaanbaatar terrane. Early Permian mafic-to-felsic dikes cut the folded clastic rocks of the accretionary complex of the Ulaanbaatar terrane (Khishigsuren et al 2009).…”

Section: Tectonic Implication Of the Low-angle Southward-dipping Thrustmentioning

confidence: 99%

See 2 more Smart Citations

Late Paleozoic low-angle southward-dipping thrust in the Züünharaa area, Mongolia: tectonic implications for the geological structures in the Sayan-Baikal and Hangai-Daur belts

Gantumur

Tsukada

2017

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

low-angle southward-dipping thrusts, similar to the present study, are widely distributed in the Haraa terrane of the Hangai-Daur belt and in terranes of the Sayan-Baikal belt. Whereas, the contemporaneous southeast-verging composite folds and northward-dipping thrusts are developed in the accretionary complexes, which are exposed at south of the Haraa terrane. These contrasting structures suggest a couple of "landward-verging" and "oceanward-verging" structures and may correspond to the "doubly vergent asymmetric structure" of Alpine-type compressional orogen.

show abstract

The crustal structure of south central Mongolia using receiver functions

Sandvol

et al. 2016

Tectonics

View full text Add to dashboard Cite

The crustal thickness H and average crustal velocity ratio k (Vp/Vs) beneath south central Mongolia are investigated using the H-k stacking method based on teleseismic radial receiver functions. Our primary results reveal that the local crustal thickness varies from 38 to 46 km with an average value of 43 km. Thicker crust is found beneath the western Hentey Mountains, while thinner crust is located in the southern area of the Zuunbayan fault zone. The Bouguer gravity anomalies exhibit a strong correlation with the overall crustal thickness pattern throughout most of our study regime. Moreover, a new approach which integrates the Bouguer anomaly gradient and the receiver function-derived crustal thickness is adopted to calculate the density of the lower crust underneath central Mongolia. Fairly dense lower crust of approximately 3000 kg/m 3 is found in the Middle Gobi Desert. The measured crustal Vp/Vs ratio ranges from 1.68 to 1.83 with an average value of 1.74. Low Vp/Vs ratio is found beneath the western Hentey Mountains. In general, low Vp/Vs ratios correlate well with regions of quartz-rich crust and high heat flow. High Vp/Vs ratios occur in the Middle Gobi volcanic regions and the Mesozoic Southern Gobi Basin.

show abstract

Provenance and origins of a Late Paleozoic accretionary complex within the Khangai–Khentei belt in the Central Asian Orogenic Belt, central Mongolia

Cited by 25 publications

References 72 publications

Gold Mineralization of the Gatsuurt Deposit in the North Khentei Gold Belt, Central Northern Mongolia

Gold Mineralization of the Gatsuurt Deposit in the North Khentei Gold Belt, Central Northern Mongolia

Late Paleozoic low-angle southward-dipping thrust in the Züünharaa area, Mongolia: tectonic implications for the geological structures in the Sayan-Baikal and Hangai-Daur belts

The crustal structure of south central Mongolia using receiver functions

Contact Info

Product

Resources

About