Introduction

Winchester, J. A.

doi:10.1007/978-1-4615-7344-9_1

Later Proterozoic Stratigraphy of the Northern Atlantic Regions 1988

DOI: 10.1007/978-1-4615-7344-9_1

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Introduction

J. A. Winchester¹

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Cited by 2 publications

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Chemostratigraphic correlation, structure and sedimentary environments in the Dalradian' of the NW Co. Mayo inlier, NW Ireland

Winchester

Max

1996

JGS

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A thorough geochemical survey of the Dalradian rocks in the NW Mayo inlier has shown that each formation has a characteristic geochemical signature, within regional geochemical trends that vary systematically with stratigraphic age. This geochemical characterization enables correlation between geographically and tectonically isolated stratigraphic successions in the NW Mayo inlier. An almost complete succession of late Proterozoic Grampian. Appin and Argyll Group Dalradian rocks structurally overlies earlier basement Annagh Division gneisses in structural blocks bounded by Caledonian thrusts, extensional low-angle faults, and steeply dipping faults. Grampian–Appin Group relationships are better seen here than anywhere else in Scotland or Ireland. but no Tayvallich Subgroup or Southern Highland Group Dalradian rocks are present. Comparison with chemostratigraphic data from Scottish Dalradian rocks reveals broadly similar chemical trends with time. suggesting that the geological evolution of the Dalradian took place in a related depositional environment, probably an unbroken continental margin, along the entire Dalradian outcrop seen in both Scotland and Ireland.

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Chemostratigraphic correlation, structure and sedimentary environments in the Dalradian' of the NW Co. Mayo inlier, NW Ireland

Winchester

Max

1996

JGS

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The Green Beds of the SW Highlands: deposition and origin of a basic igneous-rich sedimentary sequence in the Dalradian Supergroup of Scotland

Pickett

Hyslop

Petterson

2006

SJG

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Synopsis The Green Beds are distinctive chlorite- and epidote-rich metasedimentary rocks, which collectively represent a series of important lithostratigraphical marker units in the Southern Highland Group of the dominantly late Precambrian Dalradian Supergroup of Scotland. In a recent re-evaluation of the nature and origin of the Green Beds, integrated mapping, sedimentological, petrological and geochemical studies have been carried out. The Green Beds form relatively thin but laterally extensive units within thick sequences of siliciclastic metasedimentary rocks, and were deposited from high-density turbidity currents and debris flows in a deep-sea slope apron or ramp setting. They comprise a physical mixture of basic and siliciclastic material, representing periodic influxes of basic igneous detritus into the ‘background’ siliciclastic sedimentary system. The mineralogy of the Green Beds is largely the result of metamorphism, although rare relict detrital minerals from both granitic and basic sources are preserved. Geochemical studies show that the Green Beds and other Southern Highland Group metasedimentary rocks have a similar trace element signature, indicating a common siliciclastic source area. Two suites of Dalradian lavas, the Tayvallich and Loch Avich pillowlavas, were also analysed. Although it is unlikely that these particular volcanic units were the source of the Green Bed basic material, it is believed that the mafic component of the Green Beds was derived from episodes of near-contemporaneous volcanic activity.

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Introduction

Cited by 2 publications

References 53 publications

Chemostratigraphic correlation, structure and sedimentary environments in the Dalradian' of the NW Co. Mayo inlier, NW Ireland

Chemostratigraphic correlation, structure and sedimentary environments in the Dalradian' of the NW Co. Mayo inlier, NW Ireland

The Green Beds of the SW Highlands: deposition and origin of a basic igneous-rich sedimentary sequence in the Dalradian Supergroup of Scotland

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