3 edition of Fractures and mineralisation in the Scottish Dalradian found in the catalog.
Fractures and mineralisation in the Scottish Dalradian
David Gordon Smith
|Contributions||University of Manchester. Department of Geology.|
|The Physical Object|
|Number of Pages||512|
Towards a genetic model for targeting gold mineralisation in the Scottish Dalradian. Applied Earth Science (Trans. Inst. Min. Metall. B) v. , p Abstracts from the Annual Winter Meeting of the Mineral Deposit Studies Group 5th–7th January at the Natural History Museum, London. ABSTRACT: Vein-hosted gold mineralisation occurs throughout the Dalradian supergroup in Scotland. The formation mechanisms of the Cononish deposit are unclear and poorly defined. To help constrain the genesis of gold mineralisation a number of new showings have been identified near to .
In the Scottish case, the folded Dalradian metasediments have a number of syn-sedimentary sulfide-bearing horizons located at depth that may also have contributed to mineralisation. The voluminous post-collisional granites located through the Caledonides are commonly spatially and temporally associated with appinite intrusions. Above the Andalusite+K-feldspar isograd the rocks are hornfelses, but relict features of S2 persist. Rocks of the upper Spinel and Sillimanite zones are agmatic/stromatic migmatites which preserve evidence of local partial melting in the form of S2-parallel leucosomes and thin fracture-filling vein leucosomes. All leucosomes are K-feldspar-rich.
Metalliferous mineralisation - introduction . Many occurrences of precious and base metals and of baryte have been discovered in the Grampian Highlands over the last quarter of a century as geochemical and other modern exploration techniques have been applied to the region; these add to the old records of metalliferous mineralisation (Wilson and Flett, ). Copper-molybdenum sulphide mineralization is present in a small diorite body that intrudes Dalradian rocks on the south side of Loch Tay (), close to the line of the Loch Tay is one of the few well-exposed examples of porphyry-style mineralization in Scotland and is renowned for its well-formed crystals of tetrahedrite-tennantite.
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Geological setting and new occurrences. • The Dalradian supergroup, comprising marine clastic sedimentary rocks and some volcanic units, underwent deformation during closure of the Iapetus ocean between and Ma. • Between and Ma large granite plutons were emplaced with a series of associated dyke and sill swarms.
• Gold mineralisation is found throughout the Dalradian. Mineralisation in the Dalradian of Scotland includes stratabound Zn–Pb mineralisation in the Argyll Group (Gunn et al.,Scott et al., ), base metal vein mineralisation that occurs throughout the Dalradian but in particular in the SW Highland and on Islay (Anderson et al.,Baron and Parnell,Gunn et al., ), Au vein mineralisation such as at the Cononish Mine near Tyndrum (Fig.
Cited by: Metamorphic rocks types of the Scottish Dalradian (Barrow's and Buchan zones) in outcrop and thin section. 1 Chlorite-zone metabasite Competent (epidote-bearing?) lens in fissile greenschist, chlorite zone, Knapdale, Argyll. 2 River N Esk, near garnet isograd.
These veins are concentrated in dilational zones in fold hinges, but apophyses follow schistosity and fold axial surface fractures.
The veins are most common in the cores of regional structures, especially the Dalradian Downbend and consist of quartz, calcite, chlorite and metallic sulphides and by: Vein-hosted gold mineralisation occurs throughout the Dalradian supergroup in Scotland.
The formation mechanisms of the Cononish deposit are unclear and poorly defined. The metamorphism of the Dalradian rocks of Scotland is reviewed and commented on, attention being paid to the nature and spatial distribution of the zones and their significance in PT modelling.
Reactions defining Barrovian and Buchan isograds are listed and figured and the importance of textural and chemical disequilibrium discussed. The effect of rock composition on the isograds is examined. Fractures and mineralisation in the Scottish Dalradian book Fluid Flow and Gold Mineralization in the Dalradian of the Sperrin Mountains, Northern Ireland Article in Economic Geology 95(7) November with Reads.
The geographical distribution of the minerals kyanite, andalusite, chloritoid, staurolite, cordierite (and garnet) in the eastern Dalradian is discussed in the light of their pressure–temperature relations.
It is established that major regional features of index mineral distribution, such as the westerly restrictions of the chloritoid zone, can be explained solely in terms of pressure. The Dalradian rocks, together with Caledonian intrusive igneous rocks, form the bedrock to most of the Grampian Highlands of Scotland and the islands of the Inner Hebrides between the Highland Boundary and Great Glen faults.
Pre-Dalradian basement crops out in parts of the northern Grampian Highlands and on the Isle of Islay. Several formations within the lower part of the Dalradian Appin Group are characterised by calcareous and calc-silicate lithologies.
Amphibole occurs in these metasedimentary units in a variety of habits, from fine-grained disseminated crystals, through radiating aggregates permeating the whole rock, to dark green layers consisting of over 90% amphibole.
cupriferous pyrite, and the Ben Lui Schist, at the midway along the Scottish Dalradian Belt which base of which a chromiferous horizon is stretches for km between Islay and Portsoy developed. (Figure 1). East of Tyndrum metasedimentary The distribution of mineralisation over some 9 km.
PDF | The Dalradian Supergroup of Britain and Ireland is mineralised by gold-tellurium vein deposits. The host succession includes carbonaceous, pyritic | Find, read and cite all the research. Kintyre Peninsula, a brief survey was conducted by the Mineral Reconnaissance Programme (MRP) to study the distribution of gold in south Knapdale and to assess the prospectivity of known base-metal veins in the area as sources of economic gold mineralisation.
Contact-metamorphic mineral assemblages are described from Dalradian non-graphitic pelites and semipelites in the southern sector of the Etive thermal aureole, adjacent to the Quarry Diorite ring intrusion.
Six metamorphic zones were mapped on the basis of incoming index minerals: I, Biotite; II, Cordierite; III, Andalusite+K-feldspar; IV, Corundum; V, Spinel; VI, Sillimanite.
Garnet and. The orthotectonic zone of the British Caledonides lies on the northern margin of the orogen and consists of a varied sequence of late Middle Proterozoic to Cambrian metasediments and meta-igneous.
The clay mineralogy of the Scottish Dalradian meta-limestones has been studied mainly by X-ray diffraction.
In the samples from the north-east part of the Dalradian outcrop, which often show evidence of intense metamorphism, clay minerals found include saponite, regularly and irregularly interstratified smectite-chlorite, swelling chlorite, normal chlorite, illite and kaolinite. Gold-bearing mineral deposits occur over a strike distance of > km within the Grampian Terrane of Scotland and Ireland.
This terrane consists of Neoproterozoic–Lower Ordovician rocks of the Dalradian Supergroup that were polyphase deformed and metamorphosed during the c. Ma Grampian Orogeny. Sulphide-rich Au–Ag deposits occur in Scotland at Calliachar–Urlar Burn, Tombuie. These comprise a series of gneissic lithologies (e.g.
the Annagh Gneiss Complex, which crops out in the west of Ireland) and a series of Dalradian inliers as well as accretionary arc lithologies. PDF | This mineralization occurs as veins and vein breccias in fractures associated with the Tyndrum-Glen Fyne fault.
°c Mineral Data Publishing, version Crystal Data: Monoclinic. Point Group: 2=m: As short prismatic to acicular crystals with large prism faces, to 2 cm; commonly massive.
Twinning: Simple twins according to the Manebach, Baveno, or Carlsbad laws. Physical Properties: Cleavage: Perfect on fg, good on fg, and poor on fg. Two horizons of low-grade stratabound sulphide mineralisation occur east of Tyndrum in the Ben Challum Quartzite, a newly recognised formation in the Argyll Group (Middle Dalradian).
The lower horizon exceeds 9 km along strike and averages ppm Zn and ppm Cu over an 80 m intersection. The upper extends for 4 km and locally contains up to % Zn over 1 m.Gold mineralisation in the Dalradian rocks of Knapdale Kintyre, south-west Highlands, Scotland Geochemical survey of gold mineralisation in the Dalradian rock of the Kintyre peninsula.
[Adobe Acrobat PDF MB] download now more information.Analysis of carbonate and pelitic mineral assemblages at the base of the Dalradian Series near Spean Bridge, Inverness-shire, leads to the conclusion that the temperature at the peak of regional metamorphism reached °C at a depth of Km.
In the light of the general parallelism of the garnet isograd (taken as nearly isothermal) and the base of the Dalradian, the thermal event is.