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Site U1335

By Heiko Pälike, Hiroshi Nishi, Mitchell Lyle, Isabella Raffi, Kusali Gamage and Adam Klaus

Abstract

Integrated Ocean Drilling Program (IODP) Site U1335 (5°18.735?N, 126°17.002?W; 4327.5 meters below sea level [mbsl]) (Fig. F1; Table T1) is located in the central area drilled during the Pacific Equatorial Age Transect (PEAT) program (IODP Expedition 320/321). Site U1335 (~26 Ma crust) is situated halfway between IODP Site U1336 ~340 km to the northwest and IODP Site U1337 ~390 km to the southeast, ~250 km south of the Clipperton Fracture Zone. Site U1335 is located on a broad plateau within north-northeast–trending abyssal hill topography. Thick sediment deposits cover the abyssal hills, with a thinning sediment cover on the hills. Site U1335 is draped with ~420 m of sediment cover (Fig. F2), estimated to be ~360 m prior to drilling. Water depth in the vicinity of Site U1335 is between 4300 and 4400 m, apart from the topography around seamounts that are 15–20 km away from the drill site (Fig. F1B).<br/><br/>Based on stage-pole reconstructions of Pacific plate motion and observations of basement age from previous drilling sites, along with magnetic anomaly maps (Cande et al., 1989), we estimated prior to drilling that Site U1335 is located on 26 Ma crust. The best control on age is information from Deep Sea Drilling Project (DSDP) Site 79, located ~600 km and 4.5° east and 3° south of Site U1335, apparently on the same fracture zone segment, with the Clipperton Fracture Zone to the north. The base of Site 79 reaches the Miocene/Oligocene boundary, or ~23 Ma on the most recent astronomically calibrated timescales.<br/><br/>Site U1335 was proposed for drilling to focus on the paleoceanographic events in the late Oligocene and into the early and middle Miocene, including the climatically significant Oligocene–Miocene transition and recovery from the Mi-1 glaciation event. In conjunction with Sites U1336 and U1337, it was also designed to provide a latitudinal transect for early Miocene age slices

Topics: QE
Publisher: Integrated Ocean Drilling Program Management International, Inc
Year: 2010
DOI identifier: 10.2204/iodp.proc.320321.107.2010
OAI identifier: oai:eprints.soton.ac.uk:170027
Provided by: e-Prints Soton
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