K-Ar biotite ages from Miocene post-collisional Garam Chashma leucogranite, eastern Hindukush Range (Trans-Himalayas), northwestern Pakistan.

ZAFAR Mohammad, MURATA Mamoru, KHAN Tahseenullah, OZAWA Hiroaki, NISHIMURA Hiroshi

doi:10.2465/jmps.95.101

K-Ar biotite ages from Miocene post-collisional Garam Chashma leucogranite, eastern Hindukush Range (Trans-Himalayas), northwestern Pakistan.

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ZAFAR Mohammad

Department of Geosciences, Faculty of Science, Naruto University of Education
MURATA Mamoru

Department of Geosciences, Faculty of Science, Naruto University of Education
KHAN Tahseenullah

Geoscience Laboratory, Geological Survey of Pakistan
OZAWA Hiroaki

Department of Geosciences, Faculty of Science, Naruto University of Education
NISHIMURA Hiroshi

Department of Geosciences, Faculty of Science, Naruto University of Education

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説明

Garam Chashma granitic rocks intrude discordantly into the Hindukush metamorphic complex on the southern margin of the Asian plate, Trans-Himalayas, northwestern Pakistan. The rocks are fine to coarse-grained, two-mica leucogranite. K-Ar biotite analyses of four samples from the Garam Chashma pluton yield 18-20 Ma ages. These ages are younger than those of the other post-collisional granitic rocks in Trans-Himalayas of Pakistan and resemble those of the Higher Himalayan granitic rocks.