Seismic properties of peridotite xenoliths as a clue to imaging the lithospheric mantle beneath NE Tasmania, Australia

K. Michibayashi*, Y. Kusafuka, T. Satsukawa, S. J. Nasir

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةArticleمراجعة النظراء

10 اقتباسات (Scopus)

ملخص

Peridotite xenoliths from Northeast Tasmania, Australia, consist of spinel lherzolites and minor dunites that originated from the uppermost mantle at depths of less than 40. km, based on the geothermal gradient beneath Tasmania, where the depth of the Moho is 29. km. The crystal preferred orientations (CPOs) of olivine and pyroxene were measured in 5 of 13 collected samples (1 dunite and 4 lherzolites) that were large enough to enable measurements. Olivine CPOs indicate the dominance of (010) [100] slip. Geothermobarometric analyses of the xenoliths yield temperatures of 950-1050. °C and pressures of 0.7-1.1. GPa. Using these data, we calculated changes in the seismic properties of a rock with ideal volume fractions of olivine and pyroxene under conditions of 1000. °C and 1. GPa, for various orientations of the structural reference frame in the case of three geodynamic models (extension, shear, and upwelling). The model of horizontal extension performs best in explaining the structure of the uppermost lithospheric mantle beneath Northeast Tasmania.

اللغة الأصليةEnglish
الصفحات (من إلى)218-223
عدد الصفحات6
دوريةTectonophysics
مستوى الصوت522-523
المعرِّفات الرقمية للأشياء
حالة النشرPublished - فبراير 5 2012

ASJC Scopus subject areas

  • ???subjectarea.asjc.1900.1908???
  • ???subjectarea.asjc.1900.1904???

بصمة

أدرس بدقة موضوعات البحث “Seismic properties of peridotite xenoliths as a clue to imaging the lithospheric mantle beneath NE Tasmania, Australia'. فهما يشكلان معًا بصمة فريدة.

قم بذكر هذا