40AR/39AR LASER-PROBE DATING BY STEP HEATING AND SPOT FUSION OF PHENGITES FROM THE DORA-MAIRA NAPPE OF THE WESTERN ALPS, ITALY

被引：0
|
作者：
SCAILLET, S
FERAUD, G
LAGABRIELLE, Y
BALLEVRE, M
RUFFET, G
机构：
[1] UNIV BRETAGNE OCCIDENTALE, GIS OCEANOL & GEODYNAM, F-29287 BREST, FRANCE
[2] FAC SCI RENNES, CTR ARMORICAIN ETUD STRUCT SOCLES, F-35042 RENNES, FRANCE
来源：
GEOLOGY | 1990年 / 18卷 / 08期
关键词：
D O I：
10.1130/0091-7613(1990)018<0741:AALPDB>2.3.CO;2
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
40 Ar/ 39 Ar laser-probe dating of phengitic micas has been carried out by step-heating and spot-fusion procedures. These micas represent successive deformation stages in the structural evolution of the internal Dora Maira nappe, western Alps. Data suggest a deformation control on Ar migration during recrystallization processes, and they are consistent with the timing of the collisional evolution previously reported for southern Dora Maira units. This study shows that the 40 Ar/ 39 Ar continuous laser-probe dating technique produces data accurate enough to discriminate several tectonometamorphic episodes recorded in single hand samples. -from Authors
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页码：741 / 744
页数：4
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