Permo-Carboniferous volcanism in Europe and northwest Africa: a superplume exhaust valve in the centre of Pangaea?

被引：53

作者：

Doblas, M ^{[1
]}

Oyarzun, R ^{[1
]}

Lopez-Ruiz, J ^{[1
]}

Cebria, JM ^{[1
]}

Youbi, N ^{[1
]}

Mahecha, V ^{[1
]}

Lago, M ^{[1
]}

Pocovi, A ^{[1
]}

Cabanis, B ^{[1
]}

机构：

[1] CSIC, Museo Nacl Ciencias Nat, E-28006 Madrid, Spain

来源：

JOURNAL OF AFRICAN EARTH SCIENCES | 1998年 / 26卷 / 01期

关键词：

D O I：

10.1016/S0899-5362(97)00138-3

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Permo-Carboniferous transition in the European-northwest African province was characterised by widespread volcanism (calc-alkaline with crustal and/or mantle lithospheric characteristics followed by alkaline/subalkaline with HIMU-type signature) with a maximum in the Stephanian-Autunian (Late Pennsylvannian to Early Permian). Extrusion of volcanics was accompanied by massive S-type synextensional granitic intrusions and hydrothermal mineralisation. The geotectonic framework involved the gravitational collapse of the Variscan Belt by extensional detachment tectonics, and its final disruption by wrench faulting. The characteristics of this volcanism are explained within progressively evolving extensional processes. It is suggested that this Permo-Carboniferous Pangaean volcanic province might be interpreted in terms of a superplume impinging on the base of the lithosphere. This model envisages that magmatism acted as an exhaust valve releasing the heat accumulated beneath the Pangaean supercontinent by insulation and blanketing processes which triggered large-scale mantle-wide upward convection and general instability of the supercontinent. (C) 1998 Elsevier Science Limited.

引用

页码：89 / 99

页数：11

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