Post-peak (<530 Ma) thermal history of Lützow-Holm Complex, East Antarctica, based on Rb–Sr and Sm–Nd mineral chronology-Reference-Cited by-同舟云学术

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

Published:2008 Issue:1 Volume:308 Page:165-181
ISSN:0305-8719
Container-title:Geological Society, London, Special Publications
language:en
Short-container-title:Geological Society, London, Special Publications

Author:

Miyamoto Tomoharu¹,Satish-Kumar M.²,Dunkley Daniel J.³,Osanai Yasuhito⁴,Yoshimura Yasutaka⁵,Motoyoshi Yoichi³,Carson Christopher J.⁶

Affiliation:

1. Department of Earth and Planetary Sciences, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan (e-mail: miyamoto@geo.kyushu-u.ac.jp)

2. Institute of Geosciences, Faculty of Science, Shizuoka University, 836 Oya, Suruga-ku, Shizuoka, 422-8529, Japan

3. National Institute of Polar Research, 9-10, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan

4. Division of Evolution of Earth Environment, Graduate School of Social and Cultural Studies, Kyushu University, 4-2-1 Ropponmatsu, Chuo-ku, Fukuoka, 810-8560, Japan

5. Department of Geology, Kochi University, 5-1, 2-chome, Akebono-cho, Kochi 780-8520, Japan

6. GA Geochronology Laboratory, Geoscience Australia, PO Box 378, Canberra, A.C.T. 2601, Australia

Abstract

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.

Publisher

Geological Society of London

Subject

Geology,Ocean Engineering,Water Science and Technology

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