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Journal of the Geological Society

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Metamorphic studies: research in progress

Report of a meeting of the Metamorphic Studies Group held at Burlington House, 3 March 1982. The meeting was organized by Dr M . Brown.

The fourthmeeting of the Metamorphic Studies Group and the Group's first Annual General Meeting were held at Burlington House on 3 March 1982. Approximately 50 members attended the meeting and 11 papers covering a wide range of topics on the theme ‘Metamorphic studies: research in progress’ werepre-sented; 5 of the apers involved current or recent research students and it remains the policy of the Group to encourage research students to contribute to its meetings.

The morning session,chaired by Professor Bernard Leake, was opened by Gibbons who presented an interesting account of his work with Mann on the tectono-metamorphic development of the Penmynydd Zone rocks of Anglesey and the Lleyn Peninsula, N Wales. Thiszone is re-interpreted by Gibbons & Mann as being the surface expression of 2 major shear zones,the Central Unit of Anglesey and the Aethwy-Lln Unit of SE Anglesey and the Lleyn Peninsula, and representing movement of sialic basement into the overlying, unmetamorphosed Gwna Group rocks. The minerals developed during the metamorphic maximum (biotite, garnet and stilpnomelane in the Central Unit and lawsonite in parts of the Aethwy-Llgn Unit, which is generally characterized by blueschist facies metamorphism overprinting an earlier greenschist facies metamorphism) post-date the main tectono- metamorphic fabric in the rocks but pre-date late brittle and ductile shearing. Gibbons & Mann presented 2 alternative models for the development of the blue-schists: either achieving

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