Mazeno Pass Pluton and Jutial Pluton, Pakistan Himalaya: age and implications for entrapment mechanisms of two granites in the Himalaya |
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| Authors: | D A Schneider M A Edwards P K Zeitler C D Coath |
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| Institution: | (1) Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, Pennsylvania, 18105, USA e-mail: dasd@lehigh.edu; pkz0@lehigh.edu, US;(2) Department of Earth and Atmospheric Sciences, State University of New York, Albany, New York, 12222, USA, US;(3) Department of Earth and Space Sciences, University of California, Los Angeles, California, 90095, USA e-mail: coath@oro.ess.ucla.edu, US |
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| Abstract: | Zircon and monazite U-(Th)-Pb ion microprobe analysis were performed on the Mazeno Pass pluton and the Jutial pluton, two
leucogranite bodies within the Nanga Parbat-Haramosh massif (NPHM), Pakistan Himalaya. Zircon rim ages and monazite ages indicate
the Mazeno Pass pluton in southwest NPHM intruded at 1.40 ± 0.05 Ma; the Jutial pluton, to the north, similarly yields concordant
zircon and monazite ages suggesting crystallization at 9.45 ± 0.06 Ma. The Jutial pluton was subsequently intruded by leucogranite
dikes at 5.3 Ma, as revealed by monazite ages. Concordancy of U-Pb and Th-Pb accessory mineral ages demonstrates the robustness
of the technique on young rocks. Both plutons, some of the youngest in the Himalaya, have a general association with nearby
shear zones that we interpret to have played an integral role in granite evolution and emplacement setting (`deformation enhanced
ascent'). Together with new field observations, these results provide an insight on the spatial and temporal relationship
between plutonism and deformation relating to the development of the massif.
Received: 31 August 1998 / Accepted: 10 March 1999 |
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