K-Ar ages of metamorphic rocks from the Puerto Berrio area in the Antioquia Province of the central Cordillera, central Colombia

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Authors:Fujiyoshi, A.; Shibata, K.
Author Affiliations:Primary:
Shizuoka Univ., Fac. Educ., Geol. Inst., Shizuoka 422, Japan
Volume Title:Ganseki Kobutsu Kosho Gakkai-Shi Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
Source:Ganseki Kobutsu Kosho Gakkai-Shi = Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 78(5), p.164-169. Publisher: Nippon Ganseki Kobutsu Kosho Gakkai, c/o: Tohoku Daigaku Rigakubu, Sendai, Japan. ISSN: 0021-4825
Publication Date:1983
Note:In English. 15 refs.; illus. incl. table
Summary:Metamorphic rocks assumed to be Precambrian are exposed in the Puerto Berrio area, situated at the eastern edge. Discordant K/Ar ages of 278 m.y. on hornblende and 127 m.y. on biotite were obtained from a gneissose amphibolite and a biotite gneiss, respectively. The hornblende age may indicate that the metamorphic rocks have been strongly subjected to late Palaeozoic metamorphism, while the biotite age may indicate that the metamorphic rocks have been subjected to the effects of late Jurassic-Cretaceous orogeny. [M.Ak.]
Subjects:Absolute age; Alpine Orogeny; Amphibole group; Amphibolites; Biotite gneiss; Chain silicates; Clinoamphibole; Cretaceous; Dates; Geochronology; Gneisses; Hornblende; Jurassic; K/Ar; Mesozoic; Metamorphic rocks; Precambrian; Silicates; Antioquia Colombia; Colombia; South America; Central Colombia; Cordillere centrale; Puerto Berrio
Abstract Numbers:86M/1257
Record ID:1986001652
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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