MONAZITE AGES BY THE CHEMICAL Th-U-TOTAL Pb ISOCHRON METHOD FOR PELITIC GNEISSES FROM THE EASTERN S∅R RONDANE MOUNTAINS, EAST ANTARCTICA
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概要
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Chemical Th-U-total Pb isochron (CHIME) ages were determined with an electron microprobe analyzer on 14 to 24 monazite grains in three garnet-biotite gneisses collected from separate outcrops in the eastern part of the S∅r Rondane Mountains, East Antarctica. On the basis of geologic and petrologic studies, investigators have inferred a two-stage metamorphic history for the S∅r Rondane : (1) an earlier regional granulite-facies event inferred from U-Pb zircon and Rb-Sr and Sm-Nd whole rock data to be ∿1000Ma in age, and (2) an amphibolite-facies overprint inferred to be ∿500Ma in age. PbO-ThO_2^* plots based on ThO_2,UO_2 and PbO contents of monazites yield a well-defined isochron for each gneiss, although both matrix grains in all gneiss samples and inclusions in garnet and pyrrhotite grains in a sample were analyzed. The isochrons give 536,534 and 534 Ma ages, indicating a single crystallization age (∿535Ma) for the monazites. This age is in good agreement with the ∿500Ma age currently assigned to the amphibolite-facies overprint. However, the high Pb retentivity reported for monazite, along with textural and mineralogical characteristics of the samples, constrains assignment of the monazite age to the granulite-facies metamorphism rather than to retrograde recrystallization. Our ∿535Ma ages give rise to a possibility of further westward extension of a Cambrian orogenic belt recently reported from the Lutzow-Holm and Yamato-Belgica Complexes, where a similar succession of metamorphic and plutonic activities has been recognized.
- 国立極地研究所の論文
著者
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Suzuki Kazuhiro
Department of Earth and Environmental Sciences, Nagoya University
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Adachi Mamoru
Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University
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Adachi Mamoru
Department Of Earth And Planetary Sciences Graduate School Of Science Nagoya University
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ASAMI Masao
Department of Geological Sciences, College of Liberal Arts, Okayama, University
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Asami M
Department Of Earth Sciences Faculty Of Science Okayama University
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Asami Masao
Department Of Geological Sciences College Of Liberal Arts Okayama University
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Suzuki Kazuhiro
Department Of Cardiovascular Surgery Yamaguchi Grand Medical Center
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Adachi Mamoru
Department Of Anesthesiology Fukushima Medical College
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Asami Masao
Department of Earth Sciences, Faculty of Science, Okayama University
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