Allochthonous metamorphic blocks on the Hebridean passive margin, Scotland

被引:36
作者
Bluck, BJ [1 ]
Dempster, TJ [1 ]
Rogers, G [1 ]
机构
[1] SCOTTISH UNIV RES & REACTOR CTR,ISOTOPE GEOSCI UNIT,GLASGOW G75 0QF,LANARK,SCOTLAND
关键词
Laurentia; Moine Thrust zone; Caledonian Orogeny; allochthons; passive margins;
D O I
10.1144/gsjgs.154.6.0921
中图分类号
P [天文学、地球科学];
学科分类号
07 [理学];
摘要
Radiometric age determinations on syn-orogenic intrusive rocks coupled with evidence from field relationships, indicate that metamorphism and ductile deformation was taking place in the Scottish metamorphic blocks coeval with extension on the Hebridean foreland. Consequently metamorphic rocks now found east and south of the Moine Thrust are regarded as substantially allochthonous, being located within the region where there was formerly a Cambrian-Early Ordovician passive margin sequence and its attendant oceanic crust. We regard these blocks as displaced terranes which acquired their metamorphic and structural signatures outside of the present Hebridean foreland regime. This may have occurred initially at the time of megacontinent splitting and later on the destructive margin which was initiated in Laurentia.
引用
收藏
页码:921 / 924
页数:4
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