Preliminary result fot the Rb-Sr mineral isochron ages of granitic rocks from Cape Omega and Oku-iwa Rock, Prince Olav Coast, East Antarctica

P(論文) The granitic rocks of the Cape Omega, and Oku-iwa Rock, yield the age of 439.0±12.3 Ma with an initial Sr isotope ratio of 0.70609±0.00014 and 417.9±2.2 Ma with an initial Sr isotope ratio of 0.70646+0.00002, respectively. These ages represent the time when these granitic rocks cooled down to...

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Bibliographic Details
Main Authors: Nishi, Naoko, Kawano, Yoshinobu, Kagami, Hiroo
Language:English
Published: National Institute of Polar Research 1999
Subjects:
Rb-Sr mineral age
cooling rate
Cape Omega
Oku-iwa Rock
Liitzow-Holm Complex
East Antarctica
Prince Olav Coast
Oku-iwa
Antarc*
Antarctica
Polar geoscience
Online Access:https://nipr.repo.nii.ac.jp/record/3048/files/KJ00000044165.pdf
https://doi.org/10.15094/00003048
https://nipr.repo.nii.ac.jp/records/3048
Description
Summary:P(論文) The granitic rocks of the Cape Omega, and Oku-iwa Rock, yield the age of 439.0±12.3 Ma with an initial Sr isotope ratio of 0.70609±0.00014 and 417.9±2.2 Ma with an initial Sr isotope ratio of 0.70646+0.00002, respectively. These ages represent the time when these granitic rocks cooled down to the closure temperature of biotite and are consistent with previous reported K-Ar biotite ages (339-449 Ma) of granitic rocks in the Liitzow-Holm Complex. Calculated cooling rates of the Cape Omega and the Oku-iwa Rock areas are 5.3-4.1°C/Ma and 3.8-3.6°C/Ma, respectively. These results are consistent with cooling rates for the amphibolite facies terrain of the Liitzow-Holm Complex previously reported. departmental bulletin paper

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