'Institute of Geological Sciences of the National Academy of Sciences of Ukraine'
Abstract
The Lunedale Fault is a growth fault forming the northern edge of a deep
Carboniferous sedimentary basin, the Stainmore Trough, which is a potential
source of brines and in which thick limestones provide suitable host rocks
for mineralisation in favourable structural traps.
The geology of the area therefore resembles that of areas containing some of
the large Pb-Zn sulphide deposits in Ireland, and the presence of baryte in
commercial quantities at Closehouse encourages the search for sulphides.
The Lundale Fault,.. including the area around Closehouse Mine, .was investigated
by an airborne geophysical survey consisting of magnetic, electromagnetic
and radiometric recordings. The magnetic data are of unusual
interest for exploration in this area because the Whin dolerite, occurring
as sills and dykes, gives rise to pronounced magnetic features, of which
some indicate previously unknown intrusions. The baryte deposit in the
Closehouse Mine is closely related to the distribution and alteration of the
Whin dykes, suggesting that a ground investigation of the aeromagnetic
anomalies could be of value in further exploration. The electromagnetic
maps do not indicate mineralisation of immediate interest and the amount
of ground follow-up work was limited by access problems
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