Vendian stage in formation of the Early Caledonian superterrane in Central Asia

Козаков, И. К.; Сальникова, Е. Б.; Ковач, В. П.; Yarmolyuk, V. V.; Anisimova, I. V.; Kozlovskii, A. M.; Plotkina, Yu. V.; Мыскова, Т. А.; Fedoseenko, A. M.; Yakovleva, S. Z.; Сугоракова, А. М.

doi:10.1134/s0869593808040023

Cited by 37 publications

(23 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A peculiarity of spatial position of Paleozoic metamorphic belts is their con finement to an external framing of a group of Precam brian blocks. From this standpoint we can suggest that coupling of diachronous fragments of Precambrian continental crust took place in the terminal Late Riphean-Vendian, which is, for instance, evidenced by the formation of Vendian South Hangay metamor phic belt located in the inner part of the Precambrian Hangay group of blocks (Kozakov et al, 2008(Kozakov et al, , 2012. It is believed that the latter had completed as a whole its consolidation by the end of the Vendian and occurred within the Vendian-Cambrian Paleoasian ocean as a composite terrane.…”

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 93%

“…An important feature of the evolution of the Pre cambrian Hangay group of blocks is that its history does not register an imposition of Late Precambrian and Early Paleozoic regional metamorphism on the Early Precambrian units of the Baidarik and Tarbag atai blocks (Kozakov et al, 2008). Manifestation of Vendian and Early Paleozoic metamorphism associ ated with Early Baikalian orogeny in rocks of the Tar bagatai and Songino blocks is also not recorded.…”

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 96%

“…Thus, their assignment to a single rock complex of the cover is still an open ques tion. We can believe that the consolidation of Late Precambrian units of the Dzabkhan Mandal zone and Early Precambrian complexes of DM occurred either during the Early Baikalian orogeny or later, in the Ven dian, owing to convergent processes within the Pale oasian Ocean (Kozakov et al, 2008(Kozakov et al, , 2010(Kozakov et al, , 2012). …”

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 97%

“…The U Pb dating and Sm Nd and Pb Pb isotope studies conducted in recent years indicate the occurrence of pre Riphean complexes only in the Baidarik and Tarbagatai blocks and in the "Gargan block" assigned by Il'in (1982) to TMM. It was therewith revealed that the southeastern part of the Baidarik block basement of DM is represented by Late and not by Early Precambrian crystalline forma tions of the Tatsaingol complex associated with the Late Baikalian orogeny (Kozakov et al, 2008). It was also noted that the western part of the Tarbagatai block and a significant part of the Songino block were formed during the Early Baikalian orogeny (Kozakov et al, 2011).…”

Section: Introductionmentioning

confidence: 95%

See 3 more Smart Citations

The Early Baikalian crystalline complex in the basement of the Dzabkhan microcontinent of the Early Caledonian orogenic area, Central Asia

Козаков

Yarmolyuk

Ковач

et al. 2012

Stratigr. Geol. Correl.

Self Cite

View full text Add to dashboard Cite

Fragments of continental blocks or microcontinents are represented in the Early Caledonian oro genic area of Central Asia (or Early Caledonian superterrane); the largest of these are the Dzabkhan and Tuva Mongolian microcontinents, with Early and Late Precambrian crystalline basements, respectively. In the linkage zone of these microcontinents, crystalline rocks of the Tarbagatai and Songino blocks that are considered as units of the Early Precambrian ensialic basement of the superterrane are also known. They are composed of strongly metamorphosed rocks formed during the Early Baikalian orogeny about 790 to 820 Ma. U Pb zircon dating and Nd isotope studies revealed, within the northwestern Dzabkhan microcontinent, the Dzabkhan Mandal zone of crystalline rocks associated with the Riphean crust forming process. The age of the gneiss substrate of this zone is estimated as 1.3 to 0.86 Ga. An early episode of metamorphism is dated at about 856 ± 2 Ma. The data available so far indicate a heterogeneous structure of the Dzabkhan microconti nent basement represented by Early Precambrian and Early and Late Baikalian crystalline formations.

show abstract

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 93%

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 96%

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

The Early Baikalian crystalline complex in the basement of the Dzabkhan microcontinent of the Early Caledonian orogenic area, Central Asia

Козаков

Yarmolyuk

Ковач

et al. 2012

Stratigr. Geol. Correl.

Self Cite

View full text Add to dashboard Cite

show abstract

“…with Early Precambrian crystalline complexes devel oped in the northwestern part and Late Precambrian complexes in the southeastern part. The latters were recognized in the Tatsaingol block, where they were distinguished as the Tatsaingol complex (Kozakov et al, 2008(Kozakov et al, , 2012a. Thus, it was established that the Hangay structures contain an "agglomerate" of Early and Late Precambrian crystalline blocks.…”

Section: Introductionmentioning

confidence: 99%

Main stages in the evolution and geodynamic setting of the South Hangay metamorphic belt, Central Asia

et al. 2015

Self Cite

View full text Add to dashboard Cite

This paper reports new geological, geochronological (U Pb method) and Sm Nd isotope geochemical data on the metamorphic and magmatic complexes of the South Hangay metamorphic belt located in the southern part of the Hangay group of the Precambrian blocks, along the junction zone between the Baidarik block and the Vendian-Late Riphean ophiolite complex of the Bayanhongor zone. A lower age limit of the early metamorphic episode of the disthene-sillimanite facies series (M 2 ) is provided by the age of 603 ± 3 Ma obtained for gabbroids of the island arc association distinguished in the Tatsaingol complex. An upper age limit is determined by granites with ages of 562 ± 2, 564 ± 5, and 571 ± 9 Ma. Later superimposed metamorphism of the andalusite-sillimanite facies series (M 2 ) was established in the southeastern part of the belt. The lower boundary of this metamorphism is constrained by the emplacement of quartz diorites at 552 ± 2 Ma, while the upper boundary is marked by postkinematic granites of the Tatsaingol pluton with an age of 545 ± 5 Ma. The protoliths of high grade metamorphic rocks contained Early and Late Precambrian rocks. The former could belong to the basement of the Baidarik block and/or its shelf, while the latter, to the rocks of the oceanic and island arc complexes of the Bayanhongor paleobasin. Virtually, the continental crust, fragments of which are represented in the Tatsaingol complex, was formed within an interval around 610-560 Ma. The final stages in the formation of the South Hangay metamorphic belt coincided with the initiation of the Vendian-Early Paleozoic paleoocenic basins, volcanic islands, and island arcs in the Early Caledonian framing of the Precambrian Hangay block structure in the Late Vendian. By the time of amal gamation of structures of the Early Caledonian superterrane of Central Asia in the Late Cambrian-Early Ordovician (500-470 Ma), an "agglomerate" of the Precambrian Hangay blocks has been already formed.

show abstract

Neoproterozoic‐Early Paleozoic Peri‐Pacific Accretionary Evolution of the Mongolian Collage System: Insights From Geochemical and U‐Pb Zircon Data From the Ordovician Sedimentary Wedge in the Mongolian Altai

et al. 2017

View full text Add to dashboard Cite

Neoproterozoic to early Paleozoic accretionary processes of the Central Asian Orogenic Belt have been evaluated so far mainly using the geology of ophiolites and/or magmatic arcs. Thus, the knowledge of the nature and evolution of associated sedimentary prisms remains fragmentary. We carried out an integrated geological, geochemical, and zircon U‐Pb geochronological study on a giant Ordovician metasedimentary succession of the Mongolian Altai Mountains. This succession is characterized by dominant terrigenous components mixed with volcanogenic material. It is chemically immature, compositionally analogous to graywacke, and marked by significant input of felsic to intermediate arc components, pointing to an active continental margin depositional setting. Detrital zircon U‐Pb ages suggest a source dominated by products of early Paleozoic magmatism prevailing during the Cambrian‐Ordovician and culminating at circa 500 Ma. We propose that the Ordovician succession forms an “Altai sedimentary wedge,” the evolution of which can be linked to the geodynamics of the margins of the Mongolian Precambrian Zavhan‐Baydrag blocks. This involved subduction reversal from southward subduction of a passive continental margin (Early Cambrian) to the development of the “Ikh‐Mongol Magmatic Arc System” and the giant Altai sedimentary wedge above a north dipping subduction zone (Late Cambrian‐Ordovician). Such a dynamic process resembles the tectonic evolution of the peri‐Pacific accretionary Terra Australis Orogen. A new model reconciling the Baikalian metamorphic belt along the southern Siberian Craton with peri‐Pacific Altai accretionary systems fringing the Mongolian microcontinents is proposed to explain the Cambro‐Ordovician geodynamic evolution of the Mongolian collage system.

show abstract

Vendian stage in formation of the Early Caledonian superterrane in Central Asia

Cited by 37 publications

References 15 publications

The Early Baikalian crystalline complex in the basement of the Dzabkhan microcontinent of the Early Caledonian orogenic area, Central Asia

The Early Baikalian crystalline complex in the basement of the Dzabkhan microcontinent of the Early Caledonian orogenic area, Central Asia

Main stages in the evolution and geodynamic setting of the South Hangay metamorphic belt, Central Asia

Neoproterozoic‐Early Paleozoic Peri‐Pacific Accretionary Evolution of the Mongolian Collage System: Insights From Geochemical and U‐Pb Zircon Data From the Ordovician Sedimentary Wedge in the Mongolian Altai

Contact Info

Product

Resources

About