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NARROW
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all geography including DSDP/ODP Sites and Legs
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Manganocummingtonite from the Mesoproterozoic, Sausar Fold Belt, Central India
Wallace Spencer Pitcher 1919–2004
Wiersma, D.J. Magic of Minerals and Rocks. : Berlin, Germany (Springer-Verlag). 2004, 160 pp., 270 figs. Price £25.00; €39.95 (Hardback). ISBN 3-540-21053-9.
AMPH-IMA04: a revised Hypercard program to determine the name of an amphibole from chemical analyses according to the 2004 International Mineralogical Association scheme
Nomenclature of amphiboles: additions and revisions to the International Mineralogical Association’s amphibole nomenclature
Relationships between hornblende K–Ar ages, chemical composition and hydrogen isotopes, Connemara, western Ireland: evidence for a massive extinct hydrothermal system
High-Ti biotite bearing ignimbrites from the Zilan Valley near Ercis, Lake Van, eastern Turkey
Fluid disturbed hornblende K-Ar ages from the Dalradian rocks of Connemara, Western Ireland
U-Pb zircon ages of basic rocks and gneisses intruded into the Dalradian rocks of Cashel, Connemara, western Ireland
The cooling history of Connemara, western Ireland, from K-Ar and Rb-Sr age studies
Comment and Reply on “Late Ordovician to Early Silurian amalgamation of the Dalradian and adjacent Ordovician rocks in the British Isles”: REPLY
Some metasomatic calc-magnesian silicate rocks from Connemara, western Ireland: mineralogical control of rock composition
The origin of granite magmas: a discussion
Nomenclature of amphiboles
Nomenclature of amphiboles
On the western boundary of the Galway Granite
The Origin of the Meta-Anorthositic Gabbros and Garnetiferous Granulites of the Sittampundi Complex, Madras, India
Sedimentary and igneous trends on AFM diagrams
The mineralogical modification of the chemistry of metamorphic rocks
Abstract A whole-rock Rb-Sr isochron for the Donegal Granite gives an age of 470±1 m.y., which places it between the “Older Granites” (pre-500 m.y.) and the “Newer Granites” (400± m.y.) of Scotland and Ireland. The initial Sr 87 /Sr 86 ratio of the Donegal Granite, together with the field evidence, suggests that some contamination by crustal material has occurred. Two groups of Dalradian rocks of near stratigraphic equivalence—sillimanite-grade Connemara Schist from western Ireland and metasedimentary rocks of lower green- schist grade from Islay, Scotland—yield isochron ages of 490±30 and 54 0±20 m.y., respectively. It is postulated that the latter is very nearly the age of the main Dalradian metamorphism, which is shown from stratigraphic evidence to have occurred probably during the Middle or Late Cambrian. The Connemara Schist, because of higher metamorphic temperature, took longer to cool to a temperature at which homogenization of strontium and rubidium isotopes ceased in the whole rock on the scale of a hand specimen. Previous work has shown that individual minerals in the Connemara Schist remained as open chemical systems until about 450 m.y. ago, and that low- grade Dalradian slate became closed to argon diffusion at 505it6 m.y. ago.