A Vendian-Cambrian Island Arc System of the Siberian Continent in Gorny Altai (Russia, Central Asia)

Buslov, M.M.; Watanabe, Tsutomu; Saphonova, I Y; Iwata, Keiji; Травин, А. В.; Akiyama, Morito

doi:10.1016/s1342-937x(05)70913-8

Cited by 96 publications

(39 citation statements)

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“…To the north of Chinese Altai, a large amount of Early Paleozoic to Neoproterozoic mafic rocks occur in Gorny Altay and West Mongolian, e.g. tholeiiteboninite series of island-arc complex and basalt-gabbro-pyroxeniteperidotite series of ophiolitic complex, which provide an ideal mafic source for the flysch sequence (Tomurtogoo, 1997;Buslov et al, 2002;Tomurtogoo, 2002;Dobretsov et al, 2004;Kruk et al, 2010). Therefore, geochemistry of the flysch sequence suggests a northward-derived mafic source, which, in combination with the old felsic sources, favors the interpretation of northward-derived multiple--sources suggested by our previous U-Pb dating of detrital zircons .…”

Section: A Northward-derived Pre-devonian Mafic Sourcementioning

confidence: 99%

“…In the CAOB, especially in the Chinese Altai and adjacent area, a huge Early Paleozoic flysch sequence occurs extensively ( Fig. 1) but little is known for the provenance and tectonic setting of the sequence, which is crucial to understand the crustal formation and tectonic evolution of the orogenic belt (Buslov et al, 2002;Chen and Jahn, 2002;Li et al, 2006;Long et al, 2007Long et al, , 2008Ota et al, 2007;Utsunomiya et al, 2009;Kröner et al, 2010b;Rojas-Agramonte et al, 2011). In the Chinese Altai, source composition and geochemical features of the flysch sequence have been poorly addressed (He et al, 1990;Chen and Jahn, 2002;Li et al, 2006;Long et al, 2007;Long et al, 2010), because previous studies in this orogen mostly focus on the age and petrogenesis of igneous rocks and are rarely related to the sedimentary sequence Xu et al, 2003;Zhang et al, 2003Zhang et al, , 2004Wang et al, 2006;Yuan et al, 2007;Sun et al, 2008;Wang et al, 2009;Cai et al, 2010;Wang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry and Nd isotopic composition of the Early Paleozoic flysch sequence in the Chinese Altai, Central Asia: Evidence for a northward-derived mafic source and insight into Nd model ages in accretionary orogen

et al. 2012

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Section: A Northward-derived Pre-devonian Mafic Sourcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochemistry and Nd isotopic composition of the Early Paleozoic flysch sequence in the Chinese Altai, Central Asia: Evidence for a northward-derived mafic source and insight into Nd model ages in accretionary orogen

et al. 2012

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“…В перифе-рийных частях блоков и в зонах рассланцевания амфиболы приобретают линейную форму локали-зации и представлены винчитом и барруазитом. Гранатовые амфиболиты, содержащие реликты эклогитов, являются результатом проявления регрессивного метаморфизма [Buslov, Watanabe, 1996;Buslov et al, 2002;Ota et al, 2007]. По результа-там минералогической геотермобарометрии пик метаморфизма для эклогитов отвечает условиям: Р=13-20 кбар и Т=590-660 °С, образование двух типов гранатовых амфиболитов происходило при Р=13-20 кбар, Т=570-610 °С; Р=7-10 кбар, Т=470-560 °С.…”

Section: методы и результаты исследованийunclassified

“…В пределах Горного Алтая выделяются следую-щие геодинамические комплексы, сформирован-ные в пределах Кузнецко-Алтайской островной ду-ги на окраине Сибирского континента в венде -раннем ордовике [Simonov, Kuznetsov, 1991;Dobretsov et al, 1992Dobretsov et al, , 2004aDobretsov et al, , 2004bBuslov et al, 1993Buslov et al, , 2001Buslov et al, , 2002Buslov et al, , 2013Simonov et al, 1994;Buslov, Watanabe, 1996] (рис. 1): 1) магматическая островная дуга с толеит-бонинитовыми и известково-щелочными сериями пород; 2) Курайская и Катунская аккреци-онные призмы, состоящие из различных фрагмен-тов океанической коры (офиолитов и палеоси-маунтов), серпентинитового меланжа с блоками высокобарических пород, олистостром, турбиди-тов; 3) Ануйско-Чуйский преддуговой прогиб, вы-полненный флишем.…”

Section: Introductionunclassified

Geochronology of the Metamorphic Rocks in the Kurai Accretionary Prism (South-Eastern Gorny Altai)

Kulikova¹,

Buslov²,

Травин³

2017

Geodin. tektonofiz.

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Abstract:The paper provides a review of the published and new geological and geochronological data on the metamorphic rocks in the Kurai accretionary prism, considering the evolution of the Kuznetsk-Altai island-arc paleosubduction channel of the Siberian continent. The following two stages are distinguished by 40 Ar/ 39 Ar and U/Pb dating: (1) 636-619 Ma and earlier: sinking of ophiolites into the subduction zone; (2) 604-585 Ma: sinking of the large bodies of oceanic uplifts into the subduction zone. These processes led to the exhumation of the high-pressure rocks and the hot Chagan-Uzun peridotites. The dynamo-thermal effect of the latter on the basalts is reflected in the inverted metamorphic zoning and the occurrence of garnet amphibolites and plagiogranite migmatites. It is probable that the paleo-seamounts collided with the island arc during the Vendian-Early Cambrian. The data reviewed in this paper give evidence of an active margin of the West Pacific type in the western Altai-Sayan folded region in the VendianCambrian.

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“…the Cambrian AC, Early Ediacaran (627-636 Ma) high-P/T metamorphosed AC, and serpentinite mélange, that were likely formed along the Kuznetsk-Altai island-arc system (Buslov et al 2002;Ota et al 2007;Safonova et al 2008; Fig. 8A).…”

Section: Neoproterozoic Mid-oceanic Atoll Complex and Its Biotamentioning

confidence: 99%

Memories of Pre-Jurassic Lost Oceans: How To Retrieve Them From Extant Lands

Isozaki

2014

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The information reflected in mid-oceanic sedimentary deposits provides critical constraints for reconstructing past global environmental changes. Available data from extant oceans, however, are limited to the Early Jurassic and younger ages, because older oceanic plates have been subducted. This article explains methods for obtaining information on pre-Jurassic mid-oceanic conditions by conducting fieldwork on older orogenic belts exposed on land. The key point is the identification of ancient accretionary complexes (AC), not along currently active margins but within older orogenic belts in continental domains, particularly by recognizing ocean plate stratigraphy (OPS) that contains mid-oceanic strata, as demonstrated by studies of on-land exposed ancient AC in Japan and elsewhere. In this paper, six examples of retrieved mid-oceanic sedimentary data are introduced, in which significant records on the following unique events in the pre-Jurassic world are archived: 1) the extinction-related Paleozoic–Mesozoic boundary superanoxia (based on data from the Jurassic AC in SW Japan); 2) the Permian Kamura cooling event in the mid-Panthalassa (ditto); 3) the Neoproterozoic snowball Earth evidence from the mid-Iapetus Ocean (based on data from the Neoproterozoic–Cambrian AC in Wales, UK); 4) the discovery of enigmatic Ediacaran (Neoproterozoic) microfossils from a mid-oceanic atoll complex (based on data from the Cambrian AC in southern Siberia, Russia); and 5) and 6) Early Archean (3.8 and 3.5 Ga) biogenic signatures in mid-oceanic deep-sea environments (based on data from the Eoarchean AC at Isua in Greenland, and the Paleoarchean one in Pilbara, Western Australia). These results demonstrate the great utility of OPS analysis for understanding pre-Jurassic lost oceans, including the early biological and environmental evolution of the globe. SOMMAIRELes informations enregistrées dans les dépôts sédimentaires médio-océaniques constituent des contraintes logiques qui permettent de reconstituer les changements environnementaux globaux. Cela dit, l’information sur de grands pans de fonds océaniques est limitée aux fonds océaniques Jurassiques précoces et plus jeunes, parce que les fonds océaniques plus anciens ont été subduits. Le présent article explique des méthodes permettant d’obtenir de l’information sur les milieux médio-océaniques pré-jurassiques par des levés de terrain sur des ceintures orogéniques affleurant sur terre. L’idée centrale consiste à circonscrire d’anciens complexes d’accrétion (AC), hors des marges actives actuelles, soit dans les ceintures orogéniques plus anciennes au sein des domaines continentaux, en y repérant des contextes stratigraphiques de plaques océaniques (OPS) qui renferment des strates médio-océaniques, comme ça a été fait lors études d’AC affleurant au Japon et ailleurs. Le présent document décrit six exemples de contextes stratigraphiques de plaques océaniques où on trouve des indices importants des événements pré-jurassiques uniques suivants : 1) l’extinction liée à la super-anoxie de la limite Paléozoïque-Mésozoïque (à partir des données d’un AC jurassique dans le sud-ouest du Japon); 2) l’épisode de refroidissement permien de Kamura du Panthalassa moyen; 3) l’épisode néoprotérozoïque de « Terre boule de neige » conservé par l’océan mi-japétien (selon les données de l’AC néoprotérozoïque-cambrien dans les Wales au Royaume-Uni); 4) la découverte de microfossiles édiacariens (Néoprotérozoïque) d’un complexe d’atolls médio-océaniques (selon les données d’un AC cambrien du sud-est sibérien, Russie); et 5 et 6) des signatures biogéniques de milieux médio-océaniques profonds de l’Archéen précoce (3,8 et 3,5 Ga) (selon les données d’un AC éoarchéen à Isua au Groenland, et d’un AC paléoarchéen à Pilbara, Australie). Ces résultats montrent la grande utilité de l'analyse de la stratigraphie des plaques océaniques pour comprendre les océans pré-Jurassique, de même que l'évolution des débuts de la vie et des milieux de vie sur Terre.

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A Vendian-Cambrian Island Arc System of the Siberian Continent in Gorny Altai (Russia, Central Asia)

Cited by 96 publications

References 6 publications

Geochemistry and Nd isotopic composition of the Early Paleozoic flysch sequence in the Chinese Altai, Central Asia: Evidence for a northward-derived mafic source and insight into Nd model ages in accretionary orogen

Geochemistry and Nd isotopic composition of the Early Paleozoic flysch sequence in the Chinese Altai, Central Asia: Evidence for a northward-derived mafic source and insight into Nd model ages in accretionary orogen

Geochronology of the Metamorphic Rocks in the Kurai Accretionary Prism (South-Eastern Gorny Altai)

Memories of Pre-Jurassic Lost Oceans: How To Retrieve Them From Extant Lands

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