The Weaklaw Vent, SE Scotland: Metasomatism of eruptive products by carbo-hydro-fluids of probable mantle origin

Abstract

The Weaklaw vent in SE Scotland (East Lothian coast), inferred to be Namurian, produced lava spatter and volcanic bombs. The latter commonly contained ultramafic xenoliths. All were metasomatised by carbonic fluids rich in incompatible elements. The lavas and xenoliths are inferred to have been basanites and lherzolites prior to metasomatism. The abundance and size of (carbonated) peridotite xenoliths at Weaklaw denotes unusual rapidity of magma ascent and high-energy eruption making Weaklaw exceptional in the British Isles. The lavas and xenoliths were altered subsequently by low-temperature (

Keywords

faulting; basanite; spinel lherzolite xenolith; metasomatism; chrome-rich smectite; tuffisite; rare-element transport; mantle de-gassing

Published in

Mineralogical Magazine
2019, volume: 83, number: 6, pages: 855-867
Publisher: MINERALOGICAL SOC

SLU Authors

• Hillier, Stephen

  • Department of Soil and Environment, Swedish University of Agricultural Sciences
    
  • The James Hutton Institute

UKÄ Subject classification

Geology

Publication identifier

• DOI: https://doi.org/10.1180/mgm.2019.67

Permanent link to this page (URI)

https://res.slu.se/id/publ/104397