【摘要】 碎屑矿物热年代学是以沉积物中未遭受热重置的碎屑矿物颗粒为研究对象,将造山带抬升、剥露和盆地沉积联系起来的年代学方法。在物源分析、源区构造热历史、古地形恢复和约束地层年龄等方面有广泛的应用。在概述其基本原理的基础上,从造山带剥露历史分析、物源分析中多种技术的联合运用和现代汇水区侵蚀速率计算3个方面介绍了这一方法近年来的研究进展。更多还原

【Abstract】 Single-grain age dating of detrital sediments can provide imprortant record on provenance and thermal/tectonic history of the source area.A popular approach to extracting such information is the U/Pb dating of detrital zircon.However,the refractory nature of U/Pb zircon system means that it is less useful for understanding the thermal and exhumation history of the hinterland than other systems.Low temperature thermochronometers(40Ar/39Ar,fission track,and(U-Th)/He) are particularly sensitive to the movement of rocks through the upper crust due to their relative low effective closure temperatures.In recent years,detrital thermochronology has been extensively used to identify the provenance of sediments from source regions with distinct thermal history,to determine the history and rate of exhumation of the source region,to reconstruct the palaeorelief,and to provide an upper limit of the sediment age.Here we review the principles of detrital thermochronology and illustrate the recent advances of this method in the following fields: a) using synorogenic sediments to constraint the exhumation history of orogen,b) A combination of low temperature thermochronometers with U/Pb system and other provenance analysis techniques,c) estimating the long-term averaged erosion rate of modern catchment.更多还原