40Ar/39Ar dating of alkaline lamprophyres from the Polish Western Carpathians

被引：0
|
作者：
Lucinska-Anczkiewicz, A
Villa, IM
Anczkiewicz, R
Slaczka, A
机构：
[1] Jagiellonian Univ, Inst Geol, Krakow, Poland
[2] Univ Bern, Mineral Petrog Inst, Lab Isotopengeol, CH-3012 Bern, Switzerland
[3] Polish Acad Sci, Krakow Res Ctr, Inst Geol Sci, PL-31002 Krakow, Poland
来源：
GEOLOGICA CARPATHICA | 2002年 / 53卷 / 01期
关键词：
Early Cretaceous; Western Carpathians; teschenites; lamprophyres; 40Ar/39Ar geochronology;
D O I：
暂无
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Amphiboles from two types of alkaline lamprophyres from the Silesian Nappe in the Polish Western Carpathians were dated by 40Ar/39Ar stepwise heating technique. Three teschenite samples representing mesocratic type of lamprophyres yielded similar ages of 122.3 +/- 1.6 Ma, while leucocratic lamprophyre represented by a syenite dyke gave 120.4 +/- 1.4 Ma date. These ages are interpreted as the time of magmatic emplacement during Early Cretaceous extensional episode within the Silesian Basin. Ages for both types of lamprophyres are identical within error limits, which points to fast (probably ca. 5 Ma) magma evolution from meso to leucocratic stage.
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页码：45 / 52
页数：8
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