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K-AR DATING OF A BASALTIC LAYER IN THE SEDIMENTARY LAVRAS BASIN, NORTHEASTERN BRAZIL

1978; Sociedade Brasileira de Geologia; Volume: 8; Issue: 4 Linguagem: Inglês

10.25249/0375-7536.1978262269

2177-4382

H. N. A. PRIEM, BOELRIJK N. A. I. M., R.H. Verschure, E.H. Hebeda, VERDURMEN E. A. TH., BON E. H.,

Geological formations and processes

The Lavras basin near Lavras da Mangabèira (Ceará, NE. Brazil) is a relatively small tectonic basin filled with non-metam-orphic sediments resting on the Precambrian/Cambrian crystalline basement. K-Ar dating of six samples from an intercalated basaltic layer yields an age of 175 ± 4 Ma, settins an age about the Early/Middle Jurassic boundary to the sedimentation.