Geochemical and geochronological constraints on distinct Early-Neoproterozoic and Cambrian accretionary events along southern margin of the Baydrag Continent in western Mongolia

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F17%3A10363694" target="_blank" >RIV/00216208:11310/17:10363694 - isvavai.cz</a>

Alternative codes found

RIV/00025798:_____/17:00000028

Result on the web

<a href="http://dx.doi.org/10.1016/j.gr.2016.09.008" target="_blank" >http://dx.doi.org/10.1016/j.gr.2016.09.008</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gr.2016.09.008" target="_blank" >10.1016/j.gr.2016.09.008</a>

Result language

angličtina

Original language name

Geochemical and geochronological constraints on distinct Early-Neoproterozoic and Cambrian accretionary events along southern margin of the Baydrag Continent in western Mongolia

Original language description

New geological, geochemical and geochronological data characterize architecture and geodynamic evolution of the southern Baydrag continental margin in Mongolia. The structurally deepest Zamtyn Nuruu Complex is composed of highly deformed orthogneisses and amphibolites intruded by syn-tectonic diorites and gabbros. Geochemical affinity of the amphibolites varies from continental-arc to within-plate tholeiites, while the Grenvillean (948 +/- 6 and 941 +/- 11 Ma) orthogneisses show features typical of magmatic-arc origin. The syn-metamorphic gabbros and diorites intruded coevally with the regional thermal event at 542 +/- 4 Ma. Zircon Hf isotope and whole-rock geochemical data point to a primitive source of mafic rocks, most likely formed in Early Cambrian arc developed on Grenvillean basement. The overlying Alag Khadny subduction melange contains eclogites and amphibolites with MORB affinity while lenses of orthogneisses (953 +/- 12 Ma: zircon, 939 +/- 5 Ma: monazite) reveal late-to post-collisional signature. The subduction event is dated by zircon at ca. 538 +/- 20 Ma. The matrix of the melange consists of metapelites and carbonates, most likely fragments of Neoproterozoic to Early Cambrian carbonate platform scrapped off the subducting plate during the mid-Cambrian accretion. The hanging-wall Khan-Taishir-Erdene Uul ophiolite is formed by Neoproterozoic pillow lavas, red cherts and associated ultramafic rocks, with gabbros dated at 973 +/- 12 Ma. Taken together, the Zamtyn Nuruu Grenvillean arc is interpreted as a result of Mirovoi Ocean subduction beneath Rodinian margin, while the Early Cambrian diorites and gabbros testify initiation of supra-subduction magmatism of Palaeo-Pacific plate beneath continental fragment of Gondwanan, most likely Tarim affinity. These two events were separated by the development of Neoproterozoic passive margin probably associated with Rodinia fragmentation.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GAP210%2F12%2F2205" target="_blank" >GAP210/12/2205: Crustal growth and construction of continental crust exemplified by Central Asian Orogenic Belt</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Gondwana Research

ISSN

1342-937X

e-ISSN

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Volume of the periodical

47

Issue of the periodical within the volume

July 2017

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

28

Pages from-to

200-227

UT code for WoS article

000400971500011

EID of the result in the Scopus database

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