V.—
            <b>The late structural and petrological history of the Lewisian rocks of the Meall Deise area, north of Gairloch, Ross-shire</b>

Bhattacharjee, C. C.

doi:10.1144/transglas.25.1.31

Cited by 12 publications

(5 citation statements)

References 7 publications

(1 reference statement)

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“…The sequence of events in the metasedimentarj schist regime (Table 3) shows the effects of polyphase deformation during the Laxfordian episode on sediments deposited c. 2.1 b.y. ago (Bhattacharjee 1963(Bhattacharjee , 1968Keppie 1969;Bikerman et al 1975). The dominant fold-forming phase (F3) corresponds with the dominant fold-forming phase in the gneisses with which c. 1740 m.y.…”

Section: Scotlandmentioning

confidence: 99%

Scotland–Finland Precambrian correlations

Bowes¹

1975

Bull Geol Soc Finland

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Isotopic age determinations indicate the generally co-eval nature of major episodes of earth history shown by the Precambrian rocks of Scotland and Finland, viz. (1) the c. 2 800-2 600 m.y. Scourian and Presvecokarelidic episodes, (2) the c. 2 200 m.y. Inverian episode and the c. 2 300 m.y. episode in Finland, (3) the c. 2.1 b.y. deposition of the Loch Maree Group in Scotland and the Jatulian quartzite, Karelian schists and related geosynclinal deposits in Finland, and (4) the c. 1 975-1 700 m.y. Laxfordian and Svecokarelian episodes. The existence of spatially connected belts in Precambrian times is suggested by the correspondence in both the sequence of development and the orientations of structural elements resulting from polyphase deformation in the successively formed Precambrian orogenic belts. This matching of complex structural frameworks implies that, before the initiation of the British-Scandinavian Caledonides, the Baltic Shield extended westward to include northwestern Britain and the continental shelf of the eastern North Atlantic Ocean. The Caledonian belt would then have developed on a plate of continental crust, or between the separated parts of a rifted continental crustal segment.

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Section: Scotlandmentioning

confidence: 99%

Scotland–Finland Precambrian correlations

Bowes¹

1975

Bull Geol Soc Finland

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“…the main phase during which the autochthonous granitic rocks were formed and the mid phase during which the dominant foliation of the gneisses was folded and structures, including the Tollie anticline, whose axial planes act as a structural control for the uprise of the intrusive granitic rocks were developed (Bhattacharjee, 1963a). Subsequently they and the host rocks were affected by brittle deformation in the late phase (Bhattacharjee, 1963b). The time relations and geological occurrence of the intrusive granitic rocks in the Loch-Laxford-Ben-Stack district (cf.…”

Section: Intrusive Granitic Rocks (Fig 4)mentioning

confidence: 99%

The petrochemistry of some Lewisian granitic rocks

Bowes

1967

Mineral. mag. j. Mineral. Soc.

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Summary. The chemical compositions of eighty granitic rocks from the Lewisian of the North-West Highlands of Scotland, particularly from the Gairloch district, are set out in relation to geological occurrence and their normative proportions of albite, orthoclase, quartz, and anorthite compared with experimental data relating to the systems NaA1Si30s-KA1Si30s-SiO2-H20 and KA1SiaOs-NaA1SiaOsCaA12Si~Os-SiO2. The field of composition for these Lewisian rocks moves from Ab Q-rich for autochthonous granites to Ab = Or = Q (approximately) for parautochthonous granites to Or-rich for intrusive granites. This trend is related to the varying roles of mineral solubility under stress, selective melting, and potassium metasomatism. RANITIC rocks comprise a considerable proportion of theLewisian complex of the North-West Highlands of Scotland. Much of the rock cropping out between Cape Wrath, Durness and the Loeh Laxford district, and from Gruinard Bay to Loch Torridon and Raasay, is quartzo-feldspathie gneiss with hornblende and biotite, while dykes and sills of granite and pegmatite occur in these regions, being particularly common in the Loch Laxford and Ben Stack district (Peach et al., 1907, pp. 37-40). The origin of the quartzo-feldspathic gneisses was ascribed by Peach et al. (1907, p. 35) to the 'plastic deformation' of an assemblage of igneous rocks, and Phemister (1948, pp. 10-11) refers to them as orthogneiss.Recent investigations of the Lewisian gneisses and associated rocks in the Loch Tollie district, north of Gairloeh, Ross-shire (Bhattacharjee, 1963a), in the Gairloch district (Park, 1964) and in the district south of Gairloch (Ghaly, 1965) have related geological occurrence and structural history to the nature of the rock types. This detailed work provides a basis for the comparison of the petrochemistry of naturally occurring granitic rocks with the results of phase equilibrium studies of systems with compositions resembling those of granitic rocks. Other investigations in the Lewisian that have provided information concerning geological occurrence and structural history (e.g. Nisbet, 1961 ; Bowes, Wright, and Park, 1964) further assist relevant comparison of petrochemical and experimental data.

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“…The three periods of preTorridonian movements in the Gairloch-Loch Maree district described by Peach (1907, pp. 245-251) and shown by Bhattacharjee (1963Bhattacharjee ( , 1968 in the area north-west of Loch Tollie, north of Gairloch, to represent a structural sequence in the Laxfordian orogeny (called main phase, mid phase and late phase, respectively) are correlated with the last three sets of folds found in the area near Furnace. The three sets of folds which pre-date the main phase are called pre-main phases ( Table 1).…”

Section: Introductionmentioning

confidence: 99%

“…the Tollie antiform, the antiform south-east of Loch nam Buainichean, and the Carnmore antiform (Clough 1907, p. 192;Peach et al 1913, pp. 17-8;Bhattacharjee 1968;Park 1964, pp. 414-6).…”

Section: Introductionmentioning

confidence: 99%

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Analysis of a mica subfabric

Keppie¹

1969

SJG

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SYNOPSISThe mica (muscovite, biotite, and/or phlogopite) in the Lewisian rocks near Furnace, Loch Maree, exhibits two habits, phylloblastic and decussate nematoblastic crystals, which are deduced to have grown during one period of deformation and metamorphism called main phase. All the micas, along with the associated mesoscopic fabric elements, are deformed by two subsequent periods of deformation, mid phase and late phase, during which no recrystallisation of mica occurred. These observations are supplemented by a petrofabric analysis, the interpretation of which involves the interplay of various factors: Schnitteffekt, the amount of minerals other than mica in the rock, the influence of active and passive s-planes versus the crystal boundary effect and interfacial tension, the degree of mid phase deformation, and the composition of the mica; all of these combine to produce the mica subfabric. The effect of late phase deformation on this subfabric is negligible within the area. O n this evidence the age dates obtained by Giletti, Moorbath, and Lambert (1961) on two muscovite samples from this area-1510±40 m.y. and 1540^45 m.y.-represent the latter part of the main phase metamorphism, thus placing it in the Laxfordian orogeny.

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V.— The late structural and petrological history of the Lewisian rocks of the Meall Deise area, north of Gairloch, Ross-shire

Cited by 12 publications

References 7 publications

Scotland–Finland Precambrian correlations

Scotland–Finland Precambrian correlations

The petrochemistry of some Lewisian granitic rocks

Analysis of a mica subfabric

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