Neogene upper-crustal cooling of the Olympus range (northern Aegean): major role of Hellenic back-arc extension over propagation of the North Anatolia Fault Zone

作者：Coutand Isabelle^*; Walsh Michael; Louis Bertha; Chanier Frank; Ferriere Jacky; Reynaud Jean Yves

来源：Terra Nova, 2014, 26(4): 287-297.

DOI：10.1111/ter.12099

The North Anatolian Fault Zone (NAFZ) is one of the most hazardous active faults on Earth, yet its Pliocene space-time propagation across the north Aegean domain remains poorly constrained. We use low-temperature multi-thermochronology and inverse thermal modelling to quantify the cooling history of the upper crust across the Olympus range. This range is located in the footwall of a system of normal faults traditionally interpreted as resulting from superposed Middle-Late Miocene N-S stretching, related to the back-arc extension of the Hellenic subduction zone, and a Pliocene-Quaternary transtensional field, attributed to the south-westward propagation of the NAFZ. We find that accelerated exhumational cooling occurred between 12 and 6 Ma at rates of 15-35 degrees C Ma(-1) and decreased to %26lt;3 degrees C Ma(-1) by 8-6 Ma. The absence of significant Plio-Pleistocene cooling across Olympus suggests that crustal exhumation there is driven by late Miocene back-arc extension, while the impact of the NAFZ remains limited.

• 出版日期2014-8