Chapter 8 Scottish mineral Geological Conservation Review sites - Replacement minerals

被引：0
|
作者：
Smith, C. G. [1 ]
Highton, A. J. [1 ]
Livingstone, A. [2 ]
MacFadyen, C. C. J. [3 ]
机构：
[1] Border Geosci, Elsrickle, Scotland
[2] Natl Museums Scotland, Formerly Dept Geol, Edinburgh, Scotland
[3] NatureScot, Silvan House,231 Corstorphine Rd, Edinburgh EH12 7AT, Scotland
来源：
PROCEEDINGS OF THE GEOLOGISTS ASSOCIATION | 2022年 / 133卷 / 4-5期
关键词：
IRONSTONE-GOSSAN DISCRIMINATION; SIMPLE GEOCHEMICAL APPROACH; SHETLAND ISLANDS; CALEDONIDES IMPLICATIONS; METASOMATIC DEVELOPMENT; SOUTH ISLAND; HAAST SCHIST; OPHIOLITE; UNST; HYDROHONESSITE;
D O I：
10.1016/j.pgeola.2022.05.004
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
This is, the eighth and final paper of a series that describes the Scottish mineral Geological Conservation Review (GCR) sites within both mainland Scotland and the associated Isles. It features locations where the mineralogy of the original rock unit has been either largely or completely replaced as a consequence of their interaction with either fluids or gaseous components derived from external sources. At both Lunda Wick and the Queyhouse Quarry, Unst, deformation of ultrabasic rocks located within or close to Cambrian-age obduction-related shear zones has resulted in the formation of new mineral species including talc, actinolite, chlorite and biotite. Within the former mine site at Craignure, copper and nickel mineralisation is a consequence of the metasomatic alteration of metabasic igneous intrusions within the youngest part of the Dalradian Supergroup sequence resulting in the formation of pyrrhotite, pentlandite and chakopyrite. The Lecht Mine site involves Dalradian and younger rocks, where iron and manganese oxides, derived from the metamorphic host rocks, have replaced both clasts and matrix within Devonian-age intrusive brecda pipes. The predominant replacement mineral within this setting is cryptomelane, but also includes ramsdellite, pyrolusite, chalcophanite, lithiophorite, woodruffite and caconexite. These replacement minerals also contain enhanced concentrations of barium, zinc, thallium, molybdenum and silver. (C) 2022 Published by Elsevier Ltd on behalf of The Geologists' Association.
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收藏
页码：445 / 456
页数：12
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