Rate of erosion and exhumation of crystalline rocks in the Hunza Karakoram defined by apatite fission track analysis

0432583 - GLÚ 2015 RIV CZ eng J - Článek v odborném periodiku
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
Výzkumný záměr: CEZ:AV0Z30130516
Institucionální podpora: RVO:67985831
Klíčová slova: apatite fission-track analysis * erosion * exhumation of rocks * Karakoram
Kód oboru RIV: DB - Geologie a mineralogie
Impakt faktor: 0.389, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0236940