title: Chapter 3. Postcollisional intrusions of the Alai Segment of South Tien Shan
metadata.name: dc.contributor.author
metadata.value: Konopelko, Dmitry L.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2020-12-01T17:26:44Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2020-12-01T17:26:44Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2020-07
metadata.lang: -
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/11701/9785288060250.04
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/21141
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The early Permian intrusions of the Alai Segment of the South Tien Shan comprise four geochemically contrasting intrusive series, including (1) I-type and (2) shoshonitic granitoids, (3) peraluminous granitoids including S-type leucogranites and (4) alkaline rocks and carbonatites, closely
  associated in space and time. New geochronological data indicate that diverse magmatic series of
  the Alai segment formed virtually coevally in a post-collisional setting. Five U-Pb zircon rock ages
  in the range 287 – 281 Ma, in combination with published ages, define the main post-collisional
  magmatic pulse at 290 - 280, which is similar to ages of post-collisional intrusions elsewhere in the South Tien Shan. The Sr-Nd-Pb-Hf isotopic compositions of the studied intrusions are consistent
  with the reworking of crustal material with 1.6 – 1.1 Ga average crustal residence times indicating
  the formation of the Alai segment of the South Tien Shan on a continental basement with Mesoproterozoic or older crust. It is suggested that position of the Alai microcontinent between two major
  sutures enabled delamination of its lithospheric mantle, which triggered the diverse post-collisional
  magmatism as a result of interaction of ascending asthenospheric material with lithospheric mantle
  and various crustal protoliths.
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: Alai range
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: shoshonitic granitoids
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.subject
metadata.value: Sr-Nd-Pb-Hf isotopic compositions
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Chapter 3. Postcollisional intrusions of the Alai Segment of South Tien Shan
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Book chapter
metadata.lang: en_GB
resources.filename: 70-101.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/21141/1/70-101.pdf
resources.format: Adobe PDF
resources.size: 6,65 MB