title: Chapter 2. Postcollisional intrusions of the Kokshaal Segment of South Tien Shan
metadata.name: dc.contributor.author
metadata.value: Konopelko, Dmitry L.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2020-12-01T17:21:02Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2020-12-01T17:21:02Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2020-07
metadata.lang: -
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/11701/9785288060250.03
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/21140
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: Postcollisional granites of the Kokshaal Segment of South Tien Shan comprise about 20 postkinematic intrusions composed of biotite-amphibole granites, biotite granites and Li-F topaz-bearing
  leucogranites. The granites were emplaced coevally with tholeiitic mafic rocks and alkaline syenites.
  Geochemically the granites are classified as A-type and characterized by elevated Fe/(Fe+Mg) and
  K2O/Na2O values and high concentrations of Na2O+K2O, Rb, HFSE. On the discrimination diagrams Y-Nb and Rb-(Y+Nb) compositions of the granites plot into the field of intra-plate granites.
  On a regional scale, the compositional variations of the Kokshaal granites can be explained by
  fractionation of potassium feldspar and amphibole. The granites were probably derived from the
  crustal protoliths represented by Precambrian metamorphic rocks of the Tarim microcontinent.
  Crystallization ages of the Kokshaal granites, established utilizing U-Pb zircon dating, fall in the
  relatively narrow range between 280 and 295 Ma corresponding to the early Permian, which is in
  agreement with ages of postcollisional granites elsewhere in Tien Shan. Genesis of granites was
  related to trans-crustal shear zones.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: ru
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Kokshaal range
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: A-type granites
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: U-Pb zircon dating
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: geochemistry
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Chapter 2. Postcollisional intrusions of the Kokshaal Segment of South Tien Shan
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 35-69.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/21140/1/35-69.pdf
resources.format: Adobe PDF
resources.size: 8,69 MB