Journal
TECTONOPHYSICS
Volume 599, Issue -, Pages 97-106Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tecto.2013.04.005
Keywords
Eastern Kunlun Range; (U-Th)/He themchronology; Exhumation history; Kunlun Fault
Categories
Funding
- National Basic Research Program of China [2012CB822000]
- 111 Project of China [B07011]
- Directorate For Geosciences
- Division Of Earth Sciences [0819709] Funding Source: National Science Foundation
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To understand the magmatic and tectonic events in the Eastern Kunlun Range, we conducted systematic zircon U-Pb geochronology, and paired zircon (ZHe) and apatite (AHe) (U-Th)/He themchronology investigations in the central and eastern segments of this range. Zircon U-Pb ages show two-stage magmatic events of Late Silurian and latest Permian-Early Jurassic. ZHe and AHe ages and multi-system thermochronometers reveal multi-stage rapid cooling events. From a combination of these data with previously published geochronological and thermochronological ages, and regional geological setting, we confirm several important Phanerozoic tectono-magmatic events in this region. Whereas the Silurian granites might be related to a small paleo-ocean subduction and subsequent collision, the latest Permian-Early Triassic granitoids were produced by northward subduction of the Songpan-Ganzi Paleo-Tethyan ocean. The Late Triassic-earliest Jurassic granitoids and Late Triassic-Early Jurassic exhumation are interpreted as response to the collision between Kunlun-Qaidam and Qiangtang. Samples close to the Kunlun Fault show rapid Late Oligocene-Early Miocene exhumation (1.3-1.6 km/Ma), whereas those from the northern part of central segment display extremely low exhumation rates (0.02-0.05 km/Ma). This heterogeneous denudation during 30-20 Ma between northern and southern part of the central segment requires that crustal thickening was completed by lower-crustal underthrusting with little exhumation or crustal thickening in pre-Cenozoic times, The activity of the Kunlun Fault and associated normal faulting component were probably responsible for this stage of rapid exhumation in the southern part. The complex tectono-magmatic evolution of the Eastern Kunlun Range is controlled by pre-Cenozoic paleo-ocean subductions and subsequent continent collisions and Paleogene India-Asia collision. (C) 2013 Elsevier B.V. All rights reserved.
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