NDLI: Chronological and genetic relationships between intrusive rocks of the Berdyaush pluton, South Urals, in light of new U-Pb and Sm-Nd isotopic data

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Chronological and genetic relationships between intrusive rocks of the Berdyaush pluton, South Urals, in light of new U-Pb and Sm-Nd isotopic data

Content Provider	Springer Nature Link
Author	Krasbaev, A. A. Popov, V. S. Belyatsky, B. V.
Copyright Year	2011
Abstract	Geological observations in combination with previously published and new isotopic data allowed us to reconstruct the history of geological events that eventually gave rise to the formation of the Berdyaush pluton situated on the western slope of the South Urals: (1) emplacement of gabbro into Lower Riphean sedimentary rocks (1410–1390 Ma); an enriched mantle source of gabbro arising in the Archean or Paleoproterozoic; (2) formation of granitic melt in the lower crust; Archean TTG association subsequently enriched in K and correlative elements as a result of interaction with enriched mantle-derived magmas and related fluids was a magma source; mixing of mantle and crustal magmas in the course of their synchronous ascent with formation of hybrid intrusive rocks; injections of mafic and hybrid melts into incompletely solidified granite; fragmentation of such injections with the formation of melanocratic nodules; emplacement of basic dikes into the cooled granite—all these events took place 1410–1360 Ma ago; (3) discrete episodes of partial melting of enriched mantle source with waning intensity; formation of minor volumes of melt, which solidified under auto- and paraautochthonous conditions as local domains highly enriched in incompatible elements (1360–1270 Ma); (4) partial melting of those domains resulting in the formation of minor nepheline syenite intrusions (915–800 Ma), containing relict zircon grains dated at >1270 Ma; (5) injections of mantle-derived alkaline melt contaminated with crustal granitic material as microsyenite and syenite porphyry dikes (700–500 Ma ?). Thus, the Berdyaush pluton is a projection of a local domain of mantle and crustal magma generation, which periodically resumed its activity over almost a billion years.
Starting Page	723
Ending Page	734
Page Count	12
File Format	PDF
ISSN	10757015
Journal	Geology of Ore Deposits
Volume Number	53
Issue Number	8
e-ISSN	15556476
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-01-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geology Economic Geology Geochemistry and Petrology

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