Age and Composition of a Bounty Islands Granite and Age of a Seychelles Islands Granite

Concordant$Ar^{40}-K^{40} + Sr^{87}-Rb^{87}$ages of 189 m.y. were obtained on biotite from a Bounty Islands granite.$Sr^{87}-Rb^{87}$ages of 638 m.y. and 681 m.y., respectively, were determined on a microcline and a whole rock sample of granite from Mahé Island in the Seychelles Archipelago.

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Veröffentlicht in:	The Journal of geology 1963-11, Vol.71 (6), p.785-789
Hauptverfasser:	Wasserburg, G. J., Craig, H., Menard, H. W., Engel, A. E. J., Engel, Celeste G.
Format:	Artikel
Sprache:	eng
Schlagworte:	Archipelagos Argon Biotite Feldspars Geological Notes Geology Granite Islands Plagioclase Potassium Rocks
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Beschreibung
Zusammenfassung:	Concordant$Ar^{40}-K^{40} + Sr^{87}-Rb^{87}$ages of 189 m.y. were obtained on biotite from a Bounty Islands granite.$Sr^{87}-Rb^{87}$ages of 638 m.y. and 681 m.y., respectively, were determined on a microcline and a whole rock sample of granite from Mahé Island in the Seychelles Archipelago.
ISSN:	0022-1376 1537-5269
DOI:	10.1086/626954