Journal
TECTONOPHYSICS
Volume 617, Issue -, Pages 31-43Publisher
ELSEVIER
DOI: 10.1016/j.tecto.2014.01.011
Keywords
Qinling Mountain; Age-elevation-relationship; Thermochronology; Yanshanian orogeny; Tibetan Plateau uplift
Categories
Funding
- Eurasia-Pacific Uninet
- Austrian Science Fund FWF [P22110]
- NSFC [41190074, 41225008]
- Austrian Science Fund (FWF) [P22110] Funding Source: Austrian Science Fund (FWF)
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The western sector of the Qinling-Dabie orogenic belt plays a key role in both Late Jurassic to Early Cretaceous Yanshanian intracontinental tectonics and Cenozoic lateral escape triggered by India-Asia collision. The Taibai granite in the northern Qinling Mountains is located at the westernmost tip of a Yanshanian granite belt. It consists of multiple intrusions, constrained by new Late Jurassic and Early Cretaceous U-Pb zircon ages (156 +/- 3 Ma and 124 +/- 1 Ma). Applying various geochronometers (40Ar/39Ar on hornblende, biotite and K-feldspar, apatite fission-track, apatite [U-Th-Sm]/He) along a vertical profile of the Taibai Mountain refines the cooling and exhumation history. The new age constraints record the prolonged pre-Cenozoic intracontinental deformation as well as the cooling history mostly related to India-Asia collision. We detected rapid cooling for the Taibai granite from ca. 800 to 100 degrees C during Early Cretaceous (ca. 123 to 100 Ma) followed by a period of slow cooling from ca. 100 Ma to ca. 25 Ma, and pulsed exhumation of the low-relief Cretaceous peneplain during Cenozoic times. We interpret the Early Cretaceous rapid cooling and exhumation as a result from activity along the southern sinistral lithospheric scale tear fault of the recently postulated intracontinental subduction of the Archean/Palaeoproterozoic North China Block beneath the Alashan Block. A Late Oligocene to Early Miocene cooling phase might be triggered either by the lateral motion during India-Asia collision and/or the Pacific subduction zone. Late Miocene intensified cooling is ascribed to uplift of the Tibetan Plateau. (C) 2014 The Authors. Published by Elsevier B.V.
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