Improved Confidence in (U-Th)/He Thermochronology Using the Laser Microprobe: An Example from a Pleistocene Leucogranite, Nanga Parbat, Pakistan
نویسندگان
چکیده
منابع مشابه
Mazeno Pass Pluton and Jutial Pluton, Pakistan Himalaya: age and implications for entrapment mechanisms of two granites in the Himalaya
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 mona...
متن کاملNeotectonics and glacial deformation in the Karakoram Mountains and Nanga Parbat Himalaya
Owen, L.A. 1989. Neotectonics and deformation in the Karakoram Mountains and Nanga Parbat Himalaya. In: N.-A. Momer and J. Adams (Editors), Paleoseismicity and Neotectonics. Tectonophysics, 163: 227-265. The Karakoram Mountains and the Nanga Parbat Himalaya are one of the most rapidly rising mountain areas in the world with uplift rates in the order of 2 mm/yr. Large-scale regional warping is t...
متن کاملGeochronologic Constraints on the Tectonic Evolution and Exhumation of Nanga Parbat, Western Himalaya Syntaxis, Revisited
We examine the timing of deformation and exhumation of the Nanga Parbat-Haramosh massif in the western syntaxis of the Himalaya. This study presents geochronologic and thermochronologic data obtained from basement, shear zone, and intrusive units within the massif to reveal the Cenozoic tectonic evolution of the massif and to document the extent of the Plio-Pleistocene tectonic activity. These ...
متن کاملLaser microprobe (U–Th)/He geochronology
A new analytical method had been developed to enable high-spatial-resolution (U–Th)/He dating of accessory minerals. It involves the use of a focused ArF excimer to ablate pits in a polished grain surface, with the evolved gases spiked for isotope-dilution measurement of radiogenic He. These data are converted to concentrations by precise measurement of each pit using an optical interferometric...
متن کاملDenudation of Small Alpine Basins , Nanga Parbat Himalaya , Pakistan
Thirty-three debris fans and five small alpine basins on the south side of the rapidly uplifting Nanga Parbat Himalaya of northern Pakistan were assessed to determine how much alpine processes contribute to the overall denudation of the massif. A high-resolution digital elevation model was used to measure the volume of the small alpine fans and a few basins in the Rupal valley. These volumetric...
متن کامل