This paper presents additional chronological data for samples obtained during Leg 141 of the Ocean Drilling Program. The samples were obtained from Hole 862C, located on the Taitao Ridge, an anomalous bathymetric promontory that juts out from the Pacific continental margin of South America near the Chile Margin Triple Junction (latitude ~46-47°S).Four samples were selected for 40 Ar/ 39 Ar isotopic dating. Two of these samples were hornblende rhyolite, and the other two were phyric basalt. Hornblende separates from the rhyolitic samples provide ages of 1.54 ± 0.08 Ma and 2.2 ± 0.4 Ma. Low K contents in the basaltic samples and their slight alteration inhibited more precise age determinations.One sample, Sample 141-862C-6R-1, 36-44 cm (Piece 6), from the Taitao Ridge, is an indurated fragment of sandstone with carbonate and volcanic clasts. Foraminifer tests isolated from this fragment have yielded age diagnostic planktonic species indicative of a very late Paleocene age. The benthic and planktonic species suggest middle shelf depths.
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