Post-peak (<530 Ma) thermal history of Lützow-Holm Complex, East Antarctica, based on Rb-Sr and Sm-Nd mineral chronology

Tomoharu Miyamoto, M. Satish-Kumar, Daniel J. Dunkley, Yasuhito Osanai, Yasutaka Yoshimura, Yoichi Motoyoshi, Christopher J. Carson

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Abstract

Rb-Sr and Sm-Nd mineral dating of metamorphic rocks from Skallen, Skallevikshalsen and Rundvågshetta, in the southwestern part of the Lützow-Holm Complex, Dronning Maud Land, assists in constructing a thermal history after peak metamorphism. The results fall into two groups: (1) a record of regional cooling after peak metamorphism (524-488 Ma); (2) local resetting 50-80 Ma after peak metamorphism (474-446 Ma). This grouping is consistently observed in published ages from various localities in the Lützow-Holm Complex. A Sm-Nd age of 524 Ma is indistinguishable from published zircon and monazite ages. Ages of 511 and 488 Ma are related to cooling after peak metamorphism. The younger age group overlaps with ages of post-metamorphic magmatism and related hydrothermal activity reported from localities throughout East Antarctica. This intracontinental, post-orogenic igneous activity continued after the tectonic assembly of Gondwana.

Original languageEnglish
Pages (from-to)165-181
Number of pages17
JournalGeological Society Special Publication
Volume308
DOIs
Publication statusPublished - Dec 1 2008

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All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Geology

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