Thermochronology of Alkali Feldspar and Muscovite at T > 150 °C Using the 40Ar/39Ar Method: A Review

被引:13
作者
Spikings, Richard A. [1 ]
Popov, Daniil V. [2 ]
机构
[1] Univ Geneva, Dept Earth Sci, CH-1205 Geneva, Switzerland
[2] Open Univ, Sch Environm Earth & Ecosyst Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England
基金
瑞士国家科学基金会;
关键词
40Ar/39Ar; thermochronology; diffusion; K-feldspar; muscovite; in situ dating; ARGON DIFFUSION DOMAINS; IN-VACUO RELEASE; K-FELDSPAR; COOLING HISTORY; WHITE MICA; P-T; SYSTEMATIC VARIATIONS; HEATING EXPERIMENTS; ISOTOPE RECORDS; THERMAL HISTORY;
D O I
10.3390/min11091025
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The 40Ar/39Ar method applied to K-feldspars and muscovite has been often used to construct continuous thermal history paths between similar to 150-600 degrees C, which are usually applied to structural and tectonic questions in many varied geological settings. However, other authors contest the use of 40Ar/39Ar thermochronology because they argue that the assumptions are rarely valid. Here we review and evaluate the key assumptions, which are that (i) 40Ar is dominantly redistributed in K-feldspars and muscovite by thermally-driven volume diffusion, and (ii) laboratory experiments (high temperatures and short time scales) can accurately recover intrinsic diffusion parameters that apply to geological settings (lower temperatures over longer time scales). Studies do not entirely negate the application of diffusion theory to recover thermal histories, although they reveal the paramount importance of first accounting for fluid interaction and secondary reaction products via a detailed textural study of single crystals. Furthermore, an expanding database of experimental evidence shows that laboratory step-heating can induce structural and textural changes, and thus extreme caution must be made when extrapolating laboratory derived rate loss constants to the geological past. We conclude with a set of recommendations that include minimum sample characterisation prior to degassing, an assessment of mineralogical transformations during degassing and the use of in situ dating.
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页数:25
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