A geochemical and Sr–Nd isotopic study of the Vendian greenstones from Gorny Altai, southern Siberia: Implications for the tectonic setting of the formation of greenstones and the role of oceanic plateaus in accretionary orogen

Utsunomiya, Atsushi; Jahn, Bor‐ming; Ota, Tsutomu; Safonova, Inna

doi:10.1016/j.lithos.2009.05.020

Cited by 26 publications

(12 citation statements)

References 39 publications

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“…Similar conclusions concerning the relative immobility of Ti, REE and HFSE in ancient volcanic rocks that have experienced alteration under conditions of low water-rock ratios have been reached by workers in Phanerozoic accretionary complexes of Central Asia including Altai-Sayan (e.g., Simonov et al, 1994;Safonova, 2005;Utsunomiya et al, 2009), and in older Archean terranes (e.g., Polat et al, 1999;Jochum et al, 1991;Komiya et al, 2004). Thus, emphasis is placed on HFSE, REE and Th that are relatively immobile during secondary processes.…”

Section: Post-magmatic Alterationsupporting

confidence: 74%

“…If we boldly project the plotted point to the vertical axes we will find them within the HIMU/OIB field. The Sr and Nd isotopic compositions of similar rocks from the Altai-Sayan folded area (Yarmolyuk and Kovalenko, 2003;Utsunomiya et al, 2009) as well as from the Aruba oceanic plateau (White et al, 1999) also fall within the right-upper-quadrant range of our samples. Thus, if ignoring the post-magmatic alteration processes, the value of the Zasur'ya enriched samples overlap with the field defined by OIBtype lavas in terms of their Sr-Nd isotopic compositions.…”

Section: Sr-nd Isotopic Compositionssupporting

confidence: 65%

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Geochemical diversity in oceanic basalts hosted by the Zasur’ya accretionary complex, NW Russian Altai, Central Asia: Implications from trace elements and Nd isotopes

Safonova

Сенников

Komiya

et al. 2011

Journal of Asian Earth Sciences

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Section: Post-magmatic Alterationsupporting

confidence: 74%

Section: Sr-nd Isotopic Compositionssupporting

confidence: 65%

Geochemical diversity in oceanic basalts hosted by the Zasur’ya accretionary complex, NW Russian Altai, Central Asia: Implications from trace elements and Nd isotopes

Safonova

Сенников

Komiya

et al. 2011

Journal of Asian Earth Sciences

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“…14-16, sedimentary rocks of turbidite basins: 14, Charysh-Talitsa; 15, Anui-Chuya; 16, Kholzun-Chuya. Early Cambrian oceanic basalts are characterized by ε Nd (T) of +1 to +9, and the coeval island-arc volcanic and sedimentary rocks, by ε Nd (T) of +3.4 to +8.5 (Dobretsov et al, 2004;Kruk et al, 2010;Safonova et al, 2008Safonova et al, , 2011Utsunomiya et al, 2009). The widest variations in Nd isotope composition are observed in the Cambrian-Ordovician turbidities: ε Nd (T) = +4.0 to +5.3 in the Anui-Chuya terrane and ε Nd (T) = -4.0 to -4.6 in the Kholzun-Chuya terrane .…”

Section: Formation Of Primary Crust In Gorny Altaimentioning

confidence: 99%

“…Panteeva and V.V. Markova).In addition to our results of analyses, we used data fromBabin and Kruk (2011),Safonova et al (2008Safonova et al ( , 2011, andUtsunomiya et al (2009).…”

mentioning

confidence: 99%

Continental crust of Gorny Altai: stages of formation and evolution; indicative role of granitoids

Крук

2015

Russian Geology and Geophysics

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The composition and mechanisms of formation of continental crust in Gorny Altai and the role of granitoid magmatism in its evolution are considered. Geochemical and isotope data for major types of rocks of primary crust and for Early-Middle Paleozoic granitoids of the region are presented. The role of granitoids as indicators of the different stages of the continental-crust evolution is discussed. A review of the main models of continental crust formation is maid, and their applicability to the Gorny Altai segment of the Central Asian Fold Belt is shown. Based on the complex of geological, geochemical, isotope, and geochronological data, it has been established that the formation of continental crust in the Early and Late Caledonian terranes of Gorny Altai proceeded nearly synchronously (in the Middle-Late Devonian). In the Early Caledonian terranes, this process was the consequence of the multistage fractionation of primary juvenile crust of basic composition, and in the Late Caledonian ones it was the result of one-cycle intracrustal melting of hybrid andesitic crust rich in recycled material.

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“…8B-1, 8C), of which the basal part rests directly on the underlying pillow basaltic greenstone in which the geochemistry is similar to modern OIB rather than MORB (Safonova et al 2008;Utsunomiya et al 2009). This limestone partly possesses stromatolite or oolite-bearing horizons that suggest a shallow-marine origin (Fig.…”

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 geochemical and Sr–Nd isotopic study of the Vendian greenstones from Gorny Altai, southern Siberia: Implications for the tectonic setting of the formation of greenstones and the role of oceanic plateaus in accretionary orogen

Cited by 26 publications

References 39 publications

Geochemical diversity in oceanic basalts hosted by the Zasur’ya accretionary complex, NW Russian Altai, Central Asia: Implications from trace elements and Nd isotopes

Geochemical diversity in oceanic basalts hosted by the Zasur’ya accretionary complex, NW Russian Altai, Central Asia: Implications from trace elements and Nd isotopes

Continental crust of Gorny Altai: stages of formation and evolution; indicative role of granitoids

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

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