Rare minerals, including several new to Britain, in supergene alteration of U–Cu–As–Bi–Co mineralisation near Dalbeattie, south Scotland

Braithwaite, R. S. W.; Knight, J. R.

doi:10.1180/minmag.1990.054.374.15

Cited by 21 publications

(8 citation statements)

References 3 publications

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“…Note that on the basis of the similarity of their optical properties, the kahlerite of Meixner (1953) is equivalent to the metakahlerite of Walenta (1965a). However, both kahlerite and metakahlerite were found in an assemblage of supergene alteration phases in a context of uranium mineralization in Scotland by Braithwaite & Knight (1990). Miller & Taylor (1986) determined, on the basis of material from the Ranger I mine, Northern Territory, Australia, that saléeite is monoclinic (in agreement with Piret & Deliens 1980), with formula Mg[(UO 2 )(PO 4 )] 2 (H 2 O) 10 , and presented a refinement in the standard space-group P2 1 /c, with a 6.951(3), b 19.947(8), c 9.864(4) Å, ␤ 135.17(2)°, R1 = 5.3%.…”

Section: Mineral Nomenclaturementioning

confidence: 99%

Divalent Transition Metals and Magnesium in Structures That Contain the Autunite-Type Sheet

Locock

Burns

Flynn

2004

The Canadian Mineralogist

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Compounds that contain the autunite-type sheet and divalent cations (Mg, Mn, Fe, Co, Ni) in their interlayers have been synthesized by diffusion in gels or by hydrothermal methods, and their crystal structure determined. Data on single-crystal X-raydiffraction intensities were collected at room temperature using MoK␣ radiation and a CCD-based area detector. The autunitetype sheet has the composition [(UO 2)(XO 4)]-, X = P or As, and involves the sharing of equatorial vertices of uranyl square bipyramids with phosphate or arsenate tetrahedra. The interlayer region contains H 2 O groups and cations in octahedral coordination. The sheets are linked by hydrogen bonding and through bonds from the interlayer cations to oxygen atoms of the sheets. The structural roles of the interlayer cations in determining the symmetries and hydration states observed are discussed. Three different hydration states are observed, and these have characteristic symmetries and basal d-values: dodecahydrates are triclinic

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Section: Mineral Nomenclaturementioning

confidence: 99%

Divalent Transition Metals and Magnesium in Structures That Contain the Autunite-Type Sheet

Locock

Burns

Flynn

2004

The Canadian Mineralogist

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“…The ubiquitous association with uranium suggests that hydrocarbons circulating in the fault zone were precipitated by the effects of irradiation from the uranium (Parnell 1988a). The most intensively studied site at Needles Eye, Southwick (Miller and Taylor 1966;Braithwaite and Knight 1990) was the source of samples analysed in the present work. 4.…”

Section: Hydrocarbon Residuesmentioning

confidence: 99%

Hydrocarbon migration in the Solway Basin

Parnell¹

1995

Geological Journal

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Carboniferous rocks in the north Solway onshore outcrop show evidence of hydrocarbon migration. Oil residues occur as intergranular bitumen in sandstones, thoriferous bitumen nodules in sandstones and uraniferous bitumens in fractures associated with the North Solway Fault at the northern margin of the Solway Basin. Oil was emplaced in sandstones after the dissolution of dolomite, calcite and clay cements. The radioelement-rich bitumens represent deposition following interactions between migrating hydrocarbons and metalliferous fluids. The close proximity of the Caledonian Criffel granodiorite, unroofed by Carboniferous times, suggests that the pluton was the source of uranium and thorium. Hydrocarbon source rocks are identified further east in the more complete succession exposed in the Esk Valley region, along with further oil residues. Time-temperature modelling suggests that oil was generated from Lower Carboniferous source rocks during the Permo-Triassic. Chemical age dating of uraninite in bitumen yields early Jurassic ages, which may reflect the time of hydrocarbon migration along the North Solway Fault system, and may be related to a mid-Jurassic episode of regional uplift. Analyses of thorite in bitumen nodules give a wider spread of data, probably due to the migration of daughter lead.

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“…Others have been reported in the literature (BRAITHWAITE & KNIGHT 1990;DUNIN-BARKOVSKAYA 1976;HESS 1983;KRAUSE et al 1997;OLMI et al 1988;WALENTA 1960) but their species status remains unresolved. It should be noted that formulae given above refer to ideal, endmember compositions; extensive solid solution in the A site and involving P for As is known for naturally occurring material.…”

Section: Introductionmentioning

confidence: 99%