The crystallisation and differentiation of a layered intrusion of hydrated alkali olivine‐basalt parentage at Rhiw, North Wales | Zendy

Cattermole P. J. | Zendy

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The crystallisation and differentiation of a layered intrusion of hydrated alkali olivine‐basalt parentage at Rhiw, North Wales

Author(s) -

Cattermole P. J.

Publication year - 1976

Publication title -

geological journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.721

H-Index - 54

eISSN - 1099-1034

pISSN - 0072-1050

DOI - 10.1002/gj.3350110105

Subject(s) - olivine , basalt , trachyte , geology , geochemistry , intrusion , outcrop , hornblende , alkali basalt , alkali metal , magma , fractional crystallization (geology) , mineralogy , volcanic rock , chemistry , volcano , quartz , paleontology , biotite , organic chemistry

Three outcrops of hornblende‐bearing basic intrusives at Rhiw, S.W. Lleyn, are considered to represent faulted remnants of a single larger intrusion. The layered rock series evolved by fractional crystallisation of hydrated alkali olivine‐basalt magma which was emplaced as a number of distinct pulses. The trend of differentiation is similar to that for the Hawaiian series: alkali olivine basalt‐ hawaiite‐trachyte. Consideration is given to the respective roles of pO 2 and pH 2 O in controlling the course of differentiation.

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