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Rate of erosion and exhumation of crystalline rocks in the Hunza Karakoram defined by apatite fission track analysis
- 1.0432583 - GLÚ 2015 RIV CZ eng J - Journal Article
Kořínková, Dagmar - Svojtka, Martin - Kalvoda, J.
Rate of erosion and exhumation of crystalline rocks in the Hunza Karakoram defined by apatite fission track analysis.
Acta geodynamica et geomaterialia. Roč. 11, č. 3 (2014), s. 235-253. ISSN 1214-9705. E-ISSN 2336-4351
Institutional research plan: CEZ:AV0Z30130516
Institutional support: RVO:67985831
Keywords : apatite fission-track analysis * erosion * exhumation of rocks * Karakoram
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 0.389, year: 2014
Rapid exhumation of rock massifs in the Hunza Karakoram has been caused by collision orogeny as well as intensive and variable climate-morphogenetic processes during the late Cenozoic. Apatite fission-track dating of crystalline rocks gave AFT-ages between 3.9 ± 0.2 Ma to 9.9 ± 0.4 Ma and constrained the period of a rapid exhumation and unroofing as Upper Miocene to Quaternary. Time-temperature curves of the samples show two trends of exhumation rate: the Upper Miocene to Pliocene period of a slow rate of ca. 0.1 km/Ma followed by the Quaternary period of a relative rapid rate of ca. 2.6 km/Ma. The erosion rate reached up to a maximum of ca. 4000 m from the Upper Miocene to the present. The high intensity of recent denudation and transport of weathered and eroded material suggest their long-term influence on the exhumation of deeper parts of the rock massifs during active orogenetic processes in the Hunza Karakoram.
Permanent Link: http://hdl.handle.net/11104/0236940
Number of the records: 1