Abstract:Principal results: The primary objective of Leg 148 was to revisit Hole 504B in the eastern equatorial Pacific in order to deepen the hole into oceanic Layer 3 and to determine the nature of the transition from Layer 2 to Layer 3. Site 504 is located on 5.9-m.y.-old crust 201 km south of the Costa Rica Rift, the easternmost segment of the Galapagos Spreading Center (at 1°13.61 l'N, 83°43.818'W, at a water depth of 3460 m). Prior to Leg 148, Hole 504B was the deepest scientific drill hole in the oceans, extendi… Show more
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