skip to main content
Tipo de recurso Mostra resultados com: Mostra resultados com: Índice

Generation of continental adakitic rocks: Crystallization modeling with variable bulk partition coefficients

Dai, Hong-Kun ; Zheng, Jianping ; Zhou, Xiang ; Griffin, W.L.

Lithos, 02/2017, Vol.272-273, C, pp.222-231 [Periódico revisado por pares]

Texto completo disponível

Ver todas as versões
Citações Citado por
  • Título:
    Generation of continental adakitic rocks: Crystallization modeling with variable bulk partition coefficients
  • Autor: Dai, Hong-Kun ; Zheng, Jianping ; Zhou, Xiang ; Griffin, W.L.
  • Assuntos: Continental Adakitic Rocks ; Variable Bulk Partition Coefficients ; Continental Crustal Thickness ; North China Craton
  • É parte de: Lithos, 02/2017, Vol.272-273, C, pp.222-231
  • Descrição: The geochemical signatures (i.e., high Sr/Y and La/Yb ratios) of adakitic rocks in continental settings, which are derived from the continental lower crust rather than from subducted slabs, may reflect high-pressure melting in the lower crust or may be inherited from their sources. The North China Craton (NCC) is an ideal place for investigation of this type of adakites due to its ubiquitous distribution. As an example, we explore the petrogenesis of the Jurassic (~163Ma) adakitic rocks in western Liaoning, in the NE part of the NCC, using elemental and Sr–Nd isotopic analysis and crystallization modeling based on Rhyolite-MELTS. The modeling demonstrates that adakitic signatures can be generated by fractional crystallization of magmas within crust of normal thickness (i.e., 33km). Partial-melting modeling based on the composition of the lower continental crust shows that only the adakitic rocks from orogenic belts require a thickened crust (i.e., 45km). We suggest that continental adakitic rocks are not necessarily linked to high-pressure processes and their use as an indicator of thickened/delaminated continental crust should be regarded with caution. •The role of fractional crystallization played in the generation of C-type adakites•Geochemical modeling using variable bulk partition coefficients•Mafic enclaves in the host granodiorite generated by fractional crystallization•The ambiguity of C-type adakites as an indicator of specific geodynamic situations
  • Idioma: Inglês

Buscando em bases de dados remotas. Favor aguardar.