CONDITIONS OF HIGH-GRADE METAMORPHISM IN THE DALRADIAN OF CONNEMARA, IRELAND

被引：27

作者：

BARBER, JP

YARDLEY, BWD

机构：

[1] School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom

来源：

JOURNAL OF THE GEOLOGICAL SOCIETY | 1985年 / 142卷 / JAN期

关键词：

Erosion - Silicate minerals;

D O I：

10.1144/gsjgs.142.1.0087

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

In E Connemara, Ireland, Dalradian metasediments were initially metamorphosed to kyanite-staurolite grade at pressures above 7 kbar. The subsequent emplacement of basic to intermediate magmas, accompanied by uplift and erosion, produce a steepening of the geothermal gradient and led to the formation of migmatitic garnet-cordierite-sillimanitegneisses in the highest grade regions in the S. Cation exchange equilibria between coexisting mineral pairs suggest that partial melting took place under high temperatures (=750°C) and moderate pressures (4.5-6 kbar). Fluid inclusion studies and andalusite occurrences from migmatite leucosomes suggest that crystallization of the melts occurred at lower pressures (

引用

页码：87 / 96

页数：10

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