Ultra-high Excess Argon in Kyanites: Implications for Ultra-high Pressure Metamorphism in Northeast Japan |
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| Institution: | 1. CARMA, Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Helmholtz Centre Potsdam, Telegrafenberg, D-14473 Potsdam, Germany;3. Department of Earth and Space Sciences, University of California, Los Angeles, Los Angeles, CA 90095-1567, USA;4. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;5. Department of Earth Sciences, The University of Hong Kong, Pokfulam, Hong Kong;6. Department of Applied Sciences, University of Quebec at Chicoutimi, Saguenay, Canada;1. Department of Geological Engineering, Fırat University, 23119 Elazığ, Turkey;2. Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan;3. Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan;1. Department of Geology, University of Otago, Leith St, Dunedin 9054, New Zealand;2. Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada;3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;4. Geology section, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen K, Denmark;1. Research and Development Center for Ocean Drilling Science, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan;2. Department of Geology, Faculty of Science, Cairo University, 12613 Giza, Egypt;3. Department of Earth Sciences, Kanazawa University, Kanazawa, Japan |
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| Abstract: | A laser fusion Ar-Ar technique applied on single crystals of kyanite from river sands of the Kitakami Mountain region of northeast Japan yielded ages of up to 16 Ga, more than three times the age of the earth. Although the age values are geologically meaningless, the ultra-high excess argon in kyanites is unique and hitherto unreported. We interpret this to be an artifact of ultra-high argon pressure derived from radiogenic argon in potassium-rich phases such as phengites during the Barrovian type retrogression of the ultra-high pressure rocks in this region. |
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