托云深源岩石包体计算波速与地震波速共同约束西南天山壳-幔过渡带

Translated title of the contribution: Crust-mantle transitional zone beneath SW Tianshan area constrained by the seismic and calculated velocities of the deep-seated xenoliths in Tuoyun basaltic rocks

Shu Juan Jiao*, Jian Ping Zheng

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The velocities of a series of deep-seated xenoliths in Late Mesozoic-Cenozoic basaltic rocks from Tuoyun basin, western Xinjiang (NW China), are calculated. These data, combined with the published seismic velocities for the area, are used to define the composition and structure of the crust-mantle transitional zone beneath southwestern Tianshan. The calculated velocities of peridotite and granulite xenoliths are 6.98-7.36 km/s and 7.96-8.47 km/s, respectively. The comparison of these data with the seismic velocities shows the presence of the crust-mantle transitional zone in 40-48 km beneath southwestern Tianshan. The zone consists of quartz granulite, pyroxene granulite and olivine/garnet granulite from top to bottom, and then transfers into the upper mantle mainly composed of spinel-facies lherzolite with or without volatile component minerals (phlogopite or amphibole). Such crust-mantle structure of lithosphere can be well explained by magma underplating and metamorphism.

Original languageChinese
Pages (from-to)313-319
Number of pages7
JournalDiqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences
Volume33
Issue number3
Publication statusPublished - May 2008
Externally publishedYes

Keywords

  • Crust-mantle transitional zone
  • Magma underplating
  • Southwestern Tianshan
  • Velocity
  • Xenolith

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