Middle Paleozoic-Mesozoic boundary of the North Asian craton and the Okhotsk terrane: new geochemical and geochronological data and their geodynamic interpretation

Prokopiev, A. V.; Toro, Jaime; Hourigan, J. K.; Bakharev, A. G.; Miller, Elizabeth L.

doi:10.5194/smsps-4-71-2009

Cited by 28 publications

(17 citation statements)

References 14 publications

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“…As a result, a small bay of the South Anyui ocean was closed; thrust faults were formed; and granitoids of the Northern belt were emplaced at the northwestern flank of the microcontinent (Teknonika …, 2001;Prokopiev and Oxman, 2009). Granitic plutons of the transverse belts in the western Verkhoyansk region and batholiths of the southern Verkhoyansk region were formed contemporaneously (Prokop'ev et al, 2003).…”

Section: Regional Geodynamic and Metallogenic Evolutionmentioning

confidence: 98%

The Sarylakh and Sentachan gold-antimony deposits, Sakha-Yakutia: A case of combined mesothermal gold-quartz and epithermal stibnite ores

et al. 2010

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New mineralogical, thermobarometric, isotopic, and geochemical data provide evidence for long and complex formation history of the Sarylakh and Sentachan Au-Sb deposits conditioned by regional geo dynamics and various types of ore mineralization, differing in age and source of ore matter combined in the same ore localizing structural units. The deposits are situated in the Taryn metallogenic zone of the East Yakutian metallogenic belt in the central Verkhoyansk-Kolyma Fold Region. They are controlled by the regional Adycha-Taryn Fault Zone that separates the Kular-Nera Terrane and the western part of the Verkhoyansk Fold-Thrust Belt. The fault extends along the strike of the northwest trending linear folds and is deep rooted and repeatedly reactivated. The orebodies are mineralized crush zones accompanied by sulfi dated (up to 100 m wide) quartz-sericite metasomatic rocks and replacing dickite-pyrophyllite alteration near stibnite veinlets. Two stages of low sulfide gold-quartz and stibnite mineralization are distinguished. The formation conditions of the early milk white quartz in orebodies with stibnite mineralization at the Sary lakh and Sentachan deposits are similar: temperature interval 340-280°C, salt concentration in fluids 6.8-1.6 wt % NaCl equiv, fluid pressure 3430-1050 bar, and sodic bicarbonate fluid composition. The ranges of fluid salinity overlapped at both deposits. In the late regenerated quartz that attends stibnite mineralization, fluid inclusions contain an aqueous solution with salinity of 3.2 wt % NaCl equiv and are homogenized into liquid at 304-189°C. Syngenetic gas inclusions contain nitrogen 0.19 g/cm 3 in density. The pressure of 300 bar is estimated at 189°C. The composition of the captured fluid is characterized as K-Ca bicarbonatesulfate. The sulfur isotopic composition has been analyzed in pyrite and arsenopyrite from ore and metaso matic zones, as well as in coarse , medium , and fine grained stibnite varieties subjected to dynamometa morphism. The following δ 34 S values, ‰ have been established at the Sarylakh deposit: -2.0 to -0.9 in arse nopyrite, -5.5 to -1.1 in pyrite, and -5.5 to -3.6 in stibnite. At the Sentachan deposit: -0.8 to +1.0 in arse nopyrite, +0.5 to +2.6 in pyrite, and -3.9 to +0.6 in stibnite. Sulfides from the Sentachan deposit is somewhat enriched in 34 S. The 18 O of milk white quartz at the Sarylakh deposit varies from +14.8 to 17.0‰ and from +16.4 to + 19.3‰ at the Sentachan. The δ 18 O of regenerated quartz is +16.5‰ at the Sarylakh and +17.6 to +19.8‰ at the Sentachan. The δ 18 O of carbonates varies from +15.0 to 16.3% at the Sarylakh and from +16.7 to +18.2‰ at the Sentachan. The δ 13 C of carbonates ranges from -9.5 to -12.1‰ and -7.8 to -8.5‰, respectively. The calculated δ 18 O H 2 O of the early fluid in equilibrium with quartz and dolomite at 300°C are +7.9 to +10.1‰ for the Sarylakh deposit and +9.5 to +12.4‰ for the Sentachan deposit (+4.9 and 6.0‰ at 200°C for the late fluid, respectively). Most estimates fall into the interval characteristic o...

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Section: Regional Geodynamic and Metallogenic Evolutionmentioning

confidence: 98%

The Sarylakh and Sentachan gold-antimony deposits, Sakha-Yakutia: A case of combined mesothermal gold-quartz and epithermal stibnite ores

et al. 2010

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“…1). The geological evolution of the synclinorium and the area of the Nezhdaninsky deposit, in particular, was related to accretion along the Okhotsk active continental margin (Prokop'ev et al, 2003).…”

Section: Regional Geologymentioning

confidence: 99%

Fluid composition and origin in the hydrothermal system of the Nezhdaninsky gold deposit, Sakha (Yakutia), Russia

et al. 2007

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Petrochemical characteristics of igneous, sedimentary, and metasomatic rocks; chemical and isotopic compositions of minerals and fluids; and PT parameters of mineral formation at the Nezhdaninsky deposit are reported. A model of hydrothermal system formation is developed on this basis. In addition to decreasing Ba/Rb and Li/Mg ratios in the course of the hydrothermal process, resulting in the formation of ore-bearing metasomatic rocks, increasing K/Ba and diminishing K/Cs ratios indicate the probable participation of magmatic fluid in the ore deposition. The agreement of the K/Rb and K/Ba ratios with the values typical of the main trend of igneous rocks (MT) implies that the K, Rb, and Ba contents were distributed in the ore-forming hydrothermal fluid according to the ratios in the source magmatic chamber. The K/Rb ratios in metasomatic rocks correspond to the MT and approach the pegmatitic-hydrothermal trend and the composition of orthomagmatic fluid of Mo-W greisen. Similar REE patterns of igneous and terrigenous rocks do not allow the REE source to be constrained unequivocally. The lithological control of lithophile element distribution testifies to the supply of host rock components to the hydrothermal system. All studied rocks and minerals are enriched in LREE. The REE total and the contribution of HREE decrease from preore to synore metasomatic rocks, from preore to regenerated carbonates, and from older to younger scheelite. A similar tendency is noted in granitoids of the Kurum pluton. The δ 18 O values of quartz range from +10.3 to +12.6 ‰ in Au-Mo-W zones, from +15.9 to +16.4 ‰ in metasomatic rocks, from +14.8 to +16.6 ‰ in gold-ore veins, and from +13.5 to +16.9 ‰ in silverbase-metal ore mineralization. The estimates of δ suggest that water was supplied from a magmatic source ( δ 18 O = +(5.5-9.0‰)) and as a product of sedimentary rock dehydration. High-temperature (up to 390°C ) and highly concentrated (up to 31 wt % NaCl equiv) fluids participated in the mineral formation. The phase separation of the fluid into H 2 O-CO 2 liquid and predominantly carbon dioxide gas was combined with mixing of a high-temperature and relatively highly concentrated chloride solution with a low-temperature and poorly mineralized fluid. The redox conditions varied from equilibrium with CH 4 -bearing fluid at the goldmolybdenum-tungsten stage to equilibrium with CO 2 -bearing fluid during the gold-ore stage.

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“…The Kolyma-Omolon MC is located between the Verkhoyansk and Okhotsk-Chukotka orogenic belts and consists of Archaean basement and overlapping Middle Jurassic-Early Cretaceous passive margin, island arc, and accretionary complexes (Parfenov and Natal'in 1986). The Okhotsk MC is located east of the Verkhoyansk and its basement consists of Archaean and early Proterozoic schists and gneisses (Prokopiev et al 2009). The Bureya-Jiamisu MC is located in the Russian Far East and northeastern China, between the Siberian and North China cratons, and consists of Archaean-Proterozoic metamorphic basement and Neoproterozoic-early Cambrian carbonate and terrigeneous deposits (Cao et al 1992).…”

Section: Microcontinentsmentioning

confidence: 97%

“…A probable modern analogue of the Tethys (PalaeoTethys in Asia) is the modern Atlantic Ocean, which is surrounded by passive continental margins. The Verkhoyansk and Okhotsk-Chukotka orogens of NorthEast Asia are also C-type belts formed by the collision of the Kolyma-Omolon and Okhotsk MCs with the Siberian Craton during Mesozoic time (Parfenov et al 2006;Prokopiev et al 2009). …”

mentioning

confidence: 98%

Asia: a frontier for a future supercontinent Amasia

Safonova

Maruyama

2014

International Geology Review

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Asia is the world's largest but youngest continent, in which Pacific-type (P-type) and collision-type (C-type) orogenic belts coexist with numerous amalgamated continental blocks. P-type orogens represent major sites of continental growth through tonalite-trondhjemite-granodiorite type (TTG-type) juvenile granitoid magmatism and accretion of oceanic crust and intraoceanic arcs. The Asian continent includes several P-type orogenic belts, of which the largest are the Central Asian and Western Pacific. The Central Asian Orogenic Belt is dominated by P-type fossil orogens arranged with a regular northward subduction polarity. The Western Pacific is characterized by ongoing P-type orogeny related to the westward subduction of the Pacific plate. Asia has a multi-cratonic structure and its post-Palaeozoic history has witnessed amalgamation of the Laurasia composite continent and Pangaea supercontinent. Nowadays, Asia is surrounded by double-sided subduction zones, which generate new TTG-type crust and supply oceanic crust and microcontinents to its active margins. The TTGcrust can be tectonically eroded and subducted down to the mantle transition zone to form a 'second' continent, which may generate mantle upwelling, plumes, and extensive intra-plate volcanism. Moreover, recent plate movements around Asia are dominated by northward directions, which resulted in the India-Eurasia and Arabia-Eurasia collisions beginning at 50-45 and 23-20 Ma, respectively, and will result in Africa-Eurasia collision in the near future. Therefore, Asia is the best candidate to serve as the nucleus for a future supercontinent 'Amasia', likely to form 200-250 Ma in the future. In this paper we unravel a puzzle of continental growth in Asia through P-type orogeny by discussing its tectonic history and geological structure, subduction polarity in P-type orogens, tectonic erosion of TTG-type crust and arc subduction at convergent margins, generation of mantle plumes, and prospects of Asia growth and overgrowth.

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Middle Paleozoic-Mesozoic boundary of the North Asian craton and the Okhotsk terrane: new geochemical and geochronological data and their geodynamic interpretation

Cited by 28 publications

References 14 publications

The Sarylakh and Sentachan gold-antimony deposits, Sakha-Yakutia: A case of combined mesothermal gold-quartz and epithermal stibnite ores

The Sarylakh and Sentachan gold-antimony deposits, Sakha-Yakutia: A case of combined mesothermal gold-quartz and epithermal stibnite ores

Fluid composition and origin in the hydrothermal system of the Nezhdaninsky gold deposit, Sakha (Yakutia), Russia

Asia: a frontier for a future supercontinent Amasia

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