3,188 research outputs found
Late Neoproterozoic (<750 Ma) to Early Ordovician passive margin sedimentation along the Laurentian margin of Iapetus.
No full textProterozoic sedimentation, orogensis and magmatism on the Laurentian Craton (2500-750Ma).
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Early–Middle Ordovician Grampian orogenesis: ophiolite obduction and arc–continent collision
No full textScotland's geology: evolution, crustal structure and societal relevance
No full textScotland has a remarkably varied geology (Fig. 1.1). Onshore expo-
sures combined with offshore data incorporate rock units that
together represent all the major slices of geological time from
three billion years ago up to the Quaternary. In the first section of
this introduction to the 5th edition of The Geology of Scotland, we
present a summary of the geological framework and its evolution
as evidenced from the onshore rocks and offshore borehole cores
and seismic data. We present this evolution in terms of dynamic
Earth processes and highlight major global geological events. In
the second section, we draw together various independent lines of
research to reveal the heterogeneous nature and ancient pedigree
of the crust beneath Scotland, its current state of stress, and implica-
tions for earthquake risk and fault reactivation. In the final section, in
a change from previous editions, we present Scotland’s geological
resources in the context of their relevance to society and to the
underpinning of climate change mitigation and transition towards
net zero emissions
The Moine Supergroup of NW Scotland : insights into the analysis of polyorogenic supracrustal sequences
No full textThe Moine Supergroup of NW Scotland is a thick sequence of early Neoproterozoic sedimentary rocks, with minor igneous intrusions, that display evidence for multiple phases of regional deformation and metamorphism. The descriptions and interpretations of the ‘Moine Schists’ provided by the 1907 memoir (Peach et al. 1907) have been proved to be essentially correct and have laid the groundwork for a century of distinguished and influential research that has reached far beyond the confines of NW Scotland. The Survey workers recognized the sedimentary protoliths of these rocks, realized that they had been deposited unconformably on inliers of reworked basement gneisses that now occupy the cores of major folds, and understood the likely complexity of folding and the kinematic significance of mineral lineations. Further advances in understanding of the Moine rocks were mainly achieved through two techniques that were not available to the Survey workers of 100 years ago – geochronology and palaeomagnetism. Isotopic studies have confirmed the view of the Survey workers that the Moine rocks are of Precambrian age, and furthermore have demonstrated a complex, polyorogenic history
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