Radiometric ages on zircons from a cogenetic gabbro and plagioclase porphyrite suite in Hyvinkää, southern Finland | Zendy

V. Suominen | Zendy

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Radiometric ages on zircons from a cogenetic gabbro and plagioclase porphyrite suite in Hyvinkää, southern Finland

Author(s) -

V. Suominen

Publication year - 1988

Publication title -

bulletin of the geological society of finland

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.4

H-Index - 24

eISSN - 1799-4632

pISSN - 0367-5211

DOI - 10.17741/bgsf/60.2.005

Subject(s) - gabbro , geology , plagioclase , radiometric dating , suite , geochemistry , paleontology , archaeology , igneous rock , geography , quartz

The Hyvinkää gabbro pluton (Fig. 1) lies 50 km north of Helsinki in a belt of mafic plutonic and volcanogenic rocks. The pluton is composed of several different gabbro types which grade into diorite (Härme 1954, 1978, 1980; Tenhola 1971 and Puranen 1968, 1971). Early-kinematic and synkinematic intrusions gabbros, diorites, quartz diorites and granodiorites are both spatially and petrologically so closely related to volcanites that their intrusions have been interpreted as subvolcanic magma chambers (Härme 1954, 1978) of stratovolcanoes (Härme 1980).

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