caa a22 4500 386384517 CHVBK 20180307112054.0 cr unu---uuuuu 161130s1989 xx s 000 0 eng 10.1017/S0263593300014437 doi S0263593300014437 pii (NATIONALLICENCE)cambridge-10.1017/S0263593300014437 The Dalradian rocks of the Lecht, NE Scotland: stratigraphy, faulting, geochemistry and mineralisation [Elektronische Daten] Air photo interpretation and geochemistry have been used to supplement sparse field data in compiling a reconnaissance geological map of the area around the Lecht. Upper Appin and lower Argyll Group rocks are exposed, the best marker horizons being correlatives of the Appin and Jura Quartzites. Scatter plots, Q mode factor analysis and Pearson correlation coefficients of geochemical data were successfully used in the correlation of the pelite and limestone outcrops. The presence of major recumbent folds is inferred. The area is cut by numerous minor faults which are thought to be related to a major transcurrent fault, the probable north-eastern continuation of the Loch Tay fault, which was active in Lower Old Red Sandstone times. The Lecht manganiferous ironstone is a seepage-bog ore type deposit derived by weathering of the local Dalradian sequence. Despite intensive leaching, this sequence still shows anomalously high levels of several elements, particularly Mn, Ba and Zn. In addition, stratiform sphalerite and manganiferous garnet are present in Blair Atholl Subgroup limestone and pelite horizons, respectively. Mineralogical and geochemical evidence suggests the presence of Zn-Pb-(Ag)-(?Au) exhalative mineralisation within the upper Appin Group Dalradian of the region, of which the Lecht represents the distal manganiferous expression. Copyright © Royal Society of Edinburgh 1989 Appin Group nationallicence Argyll Group nationallicence base metals nationallicence geochemical correlation nationallicence gold nationallicence ironstone nationallicence Nicholson K. Geothermal Institute, University of Auckland, Private Bag, Auckland, New Zealand. Anderton R. BP Petroleum Development Limited, 301 St Vincent Street, Glasgow, G2 5DD, Scotland, U.K. Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 80/2(1989), 143-157 0263-5933 80:2<143 1989 80 TRE https://doi.org/10.1017/S0263593300014437 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0263593300014437 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nicholson K. Geothermal Institute, University of Auckland, Private Bag, Auckland, New Zealand NATIONALLICENCE 700 1- Anderton R. BP Petroleum Development Limited, 301 St Vincent Street, Glasgow, G2 5DD, Scotland, U.K NATIONALLICENCE 773 0- Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 80/2(1989), 143-157 0263-5933 80:2<143 1989 80 TRE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge