... calculated and observed d -values. The new polytype was called 6-layer ortho-hexagonal, or Unst-type, serpentine. Additional occurrences of this mineral are rare. Gillery (1959) reported 6-layer mixed with 1-layer serpentine from films supplied by W. S. Bailey, University of Wisconsin. Copyright © 1961...

... , cis -vacant 1 M illite, 2 M 2 mica, triclinic cookeite, crysotile, etc. , as well as layer silicates with complex or unusual structures, for example 4 M Ti-biotite, six-layer Unst-type serpentine, and chapmanite—an iron kaolinite. By OTED technique, Zvyagin for the first time in 1957 refined...

... diffraction patterns of clino- or ortho-chrysotile similar to the x -ray fibre diagrams; the two types are seen to exist in separate strands. Splintery varieties have a less disordered layer stacking than do silky fibres. Massive serpentines giving the lizardite x -ray powder pattern are found...

...G. W. Brindley; O. von Knorring Abstract Chemical, x -ray and thermal analyses together with petrographical data are given for specimens of antigorite from Unst, Shetland Islands. The x -ray powder diagrams are indexed on the basis of an ortho-hexagonal cell and the mineral is therefore named...

...Q. G. Crowley; R. A. Strachan Abstract The Unst Ophiolite is the best exposed of a chain of early Ordovician ophiolites in the Scottish Caledonides and is widely regarded as having formed in a supra-subduction zone setting within the Iapetus Ocean. Reinterpretation of sheeted dykes suggests...

... of the McQuillin and Brooks gravity map of Unst. Flinn provided 586 gravity measurements from both islands including those obtained for the traverses. Flinn and Taylor used the same Lacoste and Romberg gravimeter, (type G, number 568) belonging to the University of Liverpool. BGS also supplied Bouguer gravity data...

... system in Scotland (Flinn 1961). Two of the SHET profiles cross the offshore continuation of the WBF: UNST north of the Shetlands and FAIR ISLE south of the Shetlands (Fig. 1). This paper presents the interesting and somewhat surprising features of these two profiles across the WBF and shows the results...

...Fig. 3. Boulder derived from the metaconglomerate layer within the Muness Phyllite at Ramnageo, SE Unst (sample site of UN-12-3 and UN-12-5; Fig. 1c ). The dominant clast types are fine-grained felsic lithologies of probable volcanic or high-level plutonic parentage. Camera lens cap is 5 cm...

.... Further east, the Sand Voe Group is interleaved with infolds or tectonic slices of hornblendic gneisses ( Fig. 2 ). These have yielded hornblende K–Ar and 40 Ar/ 39 Ar ages of c . 2300–1000 Ma and are thought to represent inliers of Lewisian-type basement ( Flinn et al . 1979 ; Robinson 1983...

... by the 1:50000 map of Unst and Fetlar (Flinn in BGS 2002 ) covering the entire Dalradian outcrop. The Dalradian rocks of Shetland crop out in a half-drowned monadnock-like erosional remnant of the Caledonides lying some 200 km north of the northernmost exposure of Dalradian rocks in Scotland...

... previous reports of either of these minerals within Mississippi Valley type deposits of the sort found in the Northern Pennines, except for a brief reference to the occurrence of hydromagnesite at Brownley Hill Mine, Nenthead ( Green et al. 2000 ), which is described in detail below...

... types and serpentines. Ground traversing with a magnetometer shows that the magnetic schists form narrow bands which act as marker horizons in poorly exposed areas. The pattern of aeroanomalies caused by the magnetic schists and the non-magnetic rocks with which they alternate continues over the sea...

... an outline account of the evolution of the complex. The Shetland Ophiolite Complex occupies the largest part of the islands of Unst and Fetlar, part of the Shetland Islands lying north of Scotland. The complex is composed of two ophiolitic nappes, a lower nappe and an overlying upper nappe represented...

... spectrometry (LA-ICPMS) age data on monazite and zircon, U–Th–Pb chemical age data from monazite and P – T constraints on metasedimentary rocks sampled in western Unst in the northern Shetland Islands. These data are used to constrain the timing of metamorphism and the depositional age and likely provenance...

.... On discrimination diagrams it plots as a K-rich calc-alkaline T-type granite. Fig. 2. Geology of NE Unst, Shetland (after Flinn et al. 1996 ). Shetland Ophiolite Complex: nappes, serpentinized mantle harzburgite; MIZ, Middle Imbricate Zone; LIZ, Lower Imbricate Zone. (Skaw Granite. Saxa Vord Pelite: 1...

.... 1972 ), occurring at a similar stratigraphic level to the Clift Hills Group of Unst, beneath the Shetland Ophiolite Complex. This subgroup mainly comprises mafic and ultramafic rocks interpreted to have formed in a sub-marine environment, and that lie above Dalradian metapelites of the Dunrossness...

... Caledonides. The results have implications for the structural setting of the Unst ophiolite, which was obducted onto metasedimentary rocks of the Dalradian Supergroup. Metapelites in the footwall of the ophiolite yield U–Pb ages between 462 and 451 Ma with P – T conditions varying from c . 7.5 kbar and 550 °C...