The chemistry of some granitic veins from the Lewisian of Coll and Tiree, Argyllshire, Scotland

Drury, S. A.

doi:10.1016/0009-2541(72)90055-1

Cited by 16 publications

(7 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1) showing outcrops of basic orthogneisses and metasediments, and the location of samples discussed in the text. From Westbrook (1972) (Drury, 1972;Westbrook, 1972). The formation of a foliation defined by the granulite facies minerals, and centimetre-to metre-scale intrafolial folds occurred close to the peak of granulite facies metamorphism in D1.…”

Section: Geology Of Tireementioning

confidence: 98%

“…Many of the metasediments and metatonalites contain felsic veins that cross-cut the earliest fabrics (Drury, 1972;Westbrook, 1972); these veins may be the products of local anatexis during granulite facies metamorphism.…”

Section: Partial Melting In Tonalitic Gneisses and Metasedimentsmentioning

confidence: 99%

“…Most rocks have been affected by arnphibolite facies retrogression; however, relict granulite parageneses are occasional!y preserved, especially in the garnet metabasic bodies. By analogy with the mainland Lewisian, Drury (1972) and Westbrook (1972) proposed that the Tiree rocks were formed at c. 2.95 Ga, and considered that the granulite metamorphism took place in Mineral abbrcviations: Ap = apatite; Act = actinolitic amphibole; Bt = biotite; Cc = calcite; Chl = chlorite; Cpx = clinopyroxene; Ep = epidotc; Gnt = garnet; Hbl = hornblende; Ksp = K-feldspar; Mnt = magnetite; Mus = muscovite; Ilm = ilmenite; Opx = orthopyroxcnc; Plg = plagioclase fcldspar; Qtz = quartz; Scp = scapolite; Sil = sillimanitc; Zir = zircon. the 2.7 G a Badcallian event.…”

Section: Geology Of Tireementioning

confidence: 99%

“…The gneisses are cut by basic dykes which, where unaltered, comprise clinopyroxene + plagioclase f orthopyroxene f quartz f garnet. From relationships to mineral fabrics, Drury (1972) proposed that these dykes pre-dated the granulite facies metamorphism and were intruded between 2.9 and 2.7Ga. However, these dykes yield Sm-Nd mineral and Nd model ages of 2.4Ga (R. Muir, pers.…”

Section: Geology Of Tireementioning

confidence: 99%

See 3 more Smart Citations

Archaean granulite facies metamorphism of the Lewisian of Tiree, Inner Hebrides, north‐west Scotland

Cartwright

1992

Journal Metamorphic Geology

View full text Add to dashboard Cite

The Lewisian of Tiree, north-west Scotland, underwent granulite facies metamorphism prior to 2.4 Ga. The temperatures and pressures estimated from garnet-clinopyroxene, garnet-orthopyroxene, hornblende-plagioclase and garnet-biotite geothermometers and clinopyroxene-plagioclase-garnetquartz and orthopyroxene-plagioclase-garnet-quartz geobarometers are 810 f 50" C and 10.5 f 1.5 kbar.The imprecision of pressure estimates stems largely from uncertainties in garnet activity models. Calculations of blocking temperatures for Fe-Mg interdiffusion in clinopyroxene and garnet suggest that these temperatures and pressures represent only slightly reset peak-metamorphic conditions. Down-temperature re-equilibration resulted in chemical zoning over the outer 50-100 pm of the mafic minerals. P -T paths calculated from this mineralogical zoning suggest nearly isobaric cooling. However, the growth of late sillimanite in metapelites requires that the retrograde P-T path had a significant decompression component, suggesting that the mineralogical zonation does not define the retrograde P-T path. The discrepancy between the P-T path calculated from mineralogical zonation and that implied by mineral reactions probably results from the net-transfer geobarometry reactions closing at higher temperatures than the exchange geothermometers.The Tiree rocks have a similar history to the mainland Scourian complex. Granulite facies metamorphism accompanied by partial melting occurred prior to the intrusion of the Scourie dykes at c. 2.4 Ga, and the rocks underwent retrogression both prior to and after dyke emplacement. However, peak metamorphic temperatures and pressures on Tiree were lower than those recorded in the Scourian complex, and the Tiree rocks may have been at a different crustal level at that time.

show abstract

Section: Geology Of Tireementioning

confidence: 98%

Section: Partial Melting In Tonalitic Gneisses and Metasedimentsmentioning

confidence: 99%

Section: Geology Of Tireementioning

confidence: 99%

Section: Geology Of Tireementioning

confidence: 99%

See 2 more Smart Citations

Archaean granulite facies metamorphism of the Lewisian of Tiree, Inner Hebrides, north‐west Scotland

Cartwright

1992

Journal Metamorphic Geology

View full text Add to dashboard Cite

show abstract

“…The affinity of the Primrose Hill rocks is therefore still problematic. Pegmatites with similar chemical features to the Primrose Hill Granite are found in other complexes (including the Malvernian; Lambert and Holland 1971 p. 242) and older formations such as the Lewisian (Drury 1972). Similarly, the formation of hybrid igneous rocks is not rare in igneous complexes and is a characteristic of the Malvern and Johnston Complexes.…”

Section: Presence Of Pre-late Proterozoic Basementmentioning

confidence: 91%

Aspects of magmatism and plate tectonics in the Precambrian of England and Wales

Thorpe

1974

Geological Journal

View full text Add to dashboard Cite

The geological features of igneous, metamorphic and sedimentary rocks comprising the Precambrian of England Forest). The features of these rocks indicate formation in a continental margin setting and this is consistent with features of the Rushton Schist and Primrose Hill "gneiss" which suggest that they predate the Late Proterozoic orogenic activity. This evidence is consistent with plate tectonic models involving oceanic plate subduction below the Mona Complex from an Ocean to the northwest, or from a small Ocean basinsoutheast ofthecomplex. The Warren House layas show some affinities to ocean floor basalts and are problematic with regard to the Precambrian history of the area.

show abstract

An archaean granulite-grade tonalite-trondhjemite-granite suite from scourie, NW Scotland: Geochemistry and origin

Rollinson

Windley

1980

Contr. Mineral. and Petrol.

View full text Add to dashboard Cite

The chemistry of some granitic veins from the Lewisian of Coll and Tiree, Argyllshire, Scotland

Cited by 16 publications

References 20 publications

Archaean granulite facies metamorphism of the Lewisian of Tiree, Inner Hebrides, north‐west Scotland

Archaean granulite facies metamorphism of the Lewisian of Tiree, Inner Hebrides, north‐west Scotland

Aspects of magmatism and plate tectonics in the Precambrian of England and Wales

An archaean granulite-grade tonalite-trondhjemite-granite suite from scourie, NW Scotland: Geochemistry and origin

Contact Info

Product

Resources

About