S. Webb, T. Torvela, R. Chapman, D. Selby, R. Gooday
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A reinterpretation of the mineralisation processes involved in the formation of the Tomnadashan sulphide deposit, Loch Tay, Scotland, UK
The Tomnadashan sulphide deposit, which is located on the southern margin of Loch Tay (Scotland, UK), was mined for copper during the 19
th
century. The genetic processes at Tomnadashan remain poorly understood, and the mineralisation has never been dated. To gain an improved understanding of this mineral system, we have dated the molybdenite at Tomnadashan using the Re-Os chronometer. Furthermore, we have contextualised these ages within a paragenetic interpretation.
Our results show that the molybdenite is ca. 423-419 Ma, and it occurs early in the paragenesis (the second stage out of six). Based on the paragenesis of molybdenite, this age is likely to reflect the initial Caledonian mineralisation event at Loch Tay. Our new data and literature review suggest that whilst Tomnadashan is a magmatic-related ore deposit, the outcropping porphyry is unlikely to have provided the mineralising fluids associated with the mineralisation. A concealed intrusion or granitic dykes within the porphyry may be the source of the magmatic-hydrothermal fluids. The age data indicate that the Tomnadashan mineralisation is coeval with gold mineralisation at Cavanacaw in Northern Ireland, giving rise to the possibility of a previously unrecognised mid-Silurian magmatic-hydrothermal episode of gold and base metal mineralisation throughout the Grampian Terrane.
Thematic collection:
This article is part of the Early Career Research collection available at:
https://www.lyellcollection.org/topic/collections/early-career-research
期刊介绍:
Although published only since 1965, the Scottish Journal of Geology has a long pedigree. It is the joint publication of the Geological Society of Glasgow and the Edinburgh Geological Society, which prior to 1965 published separate Transactions: from 1860 in the case of Glasgow and 1863 for Edinburgh.
Traditionally, the Journal has acted as the focus for papers on all aspects of Scottish geology and its contiguous areas, including the surrounding seas. The publication policy has always been outward looking, with the Editors encouraging review papers and papers on broader aspects of the Earth sciences that cannot be discussed solely in terms of Scottish geology.
The diverse geology of Scotland continues to provide an important natural laboratory for the study of earth sciences; many seminal studies in geology have been carried out on Scottish rocks, and over the years the results of much of this work had been published in the Journal and its predecessors.
The Journal fully deserves its high reputation worldwide and intends to maintain its status in the front rank of publications in the Earth sciences.