Late- to post-orogenic exhumation of the Central Pyrenees revealed through combined thermochronological data and modelling期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Late- to post-orogenic exhumation of the Central Pyrenees revealed through combined thermochronological data and modelling

Authors:	M Gibson H D Sinclair G J Lynn † F M Stuart‡

Institution:	School of GeoSciences, Grant Institute, The University of Edinburgh, Edinburgh, UK; Shell UK Ltd., Nigg, Aberdeen, UK; Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride, Glasgow, UK

Abstract:	Apatite (U–Th)/He and fission track thermochronometry have been combined with 3D thermal modelling to constrain the late- to post-orogenic exhumation history of the Central Pyrenees, Spain. Data from four massifs immediately north and south of the present drainage divide of the mountain belt reveal a diachroneity in the transition from syn- to post-orogenic forcing of exhumation. Immediately south of the drainage divide, rapid exhumation of ～1.5 mm year^?1 decelerated after ～30 Ma to ～0.03 mm year^?1. A similar transition occurred immediately north of the drainage divide at the same time. Further south, in the core of the Axial Zone antiformal stack of the Pyrenees, rapid (～1 mm year^?1), syn-orogenic exhumation continued to ～20 Ma, but slowed to ～0.1–0.2 mm year^?1 soon after that time. This order of magnitude decrease in exhumation rates across the orogen records the diachronous transition into a post-orogenic state for the mountain belt. These data do not record rejuvenation of exhumation in Late Miocene or Pliocene times driven either by large-scale base-level change or an evolution to more erosive climatic conditions.

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