Abstract
Fission tracks are linear trails of intense radiation damage in the crystal structure of a mineral, produced by spontaneous fissioning of uranium-238 (238U) atoms. Detail information on the low-temperature thermal histories of rocks, below∼120 °C for tracks in apatite and below∼350 °C for zircon, can be provided by Fission-track (FT) analysis. The purpose of this article is to present apatite and zircon fission-track data, and U–Pb granite ages that provide information about the cooling histories of a rock which can be crucial in comprehending the exhumation episodes of the study area, in particular, and the region, in general. Granite samples were collected along the same vertical profile at different elevation, 178–944 m.a.s.l. These samples were used to determine Fission-Track and crystallization ages. HeFTy software was employed to interpret the cooling histories of the samples using forward and inverse models. The inverse model was an approach of reproducing the observed data, and it was carried out only for fission-track data from the apatite grains. And it was constructed after generating a number of forward models, where in each of these models the predicted apatite fission-track parameters were compared to the measured values. The apatite fission track (AFT) and zircon fission track (ZFT) data indicated expected age trends, i.e. the older ages at higher elevations and the younger ages at lower elevations. Similarly, the data shows that the apatite and zircon FT ages appear younger than the age of the rock crystallization. The U–Pb age in zircon consistently suggest the age of the granite is Late Triassic.
Highlights
Fission-track data and UePb dating of granites from Cameron Highland, Peninsular Malaysia: Evidence to comprehend exhumation episodes
It was constructed after generating a number of forward models, where in each of these models the predicted apatite fission-track parameters were compared to the measured values
The elevation difference between Sample CH-6 and Sample CH-10 is 766 m; the first sample was collected at an altitude of 944 m above sea level (a.s.l.), and subsequently the other samples were collected from elevations of 717 m, 577 m, 340 m, and 178 m (a.s.l.)
Summary
The study area is located in the Main Range granite of Kinta Valley, western part of Peninsular Malaysia. The valley is bounded by granite ranges; in the west by the Klendang Range and in the east by the Main Range It is characterized by remnant limestone hills, the rocks of which have been dated Silurian to Permian [4e6]. The Main Range Granite, which adjoins the Kinta Valley carbonate successions and forms the backbone watershed mountain range of the Peninsula, is the result of several large granitic batholiths [7]. This plutonic rock was emplaced by the activity related to the Late Triassic uplift from plate boundary stresses along the western edge of the Malay Peninsula [8]. Range granite has been a subject of debate; summary of most published data sets indicated that the Main Range granitoids are about 200e230 Ma old [2,9e11]
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