The University of Southampton
University of Southampton Institutional Repository

Site U1336

Site U1336
Site U1336
Integrated Ocean Drilling Program Site U1336 (site survey PEAT-5C; 7°42.067?N, 128°15.253?W; 4286 meters below sea level [mbsl]) (Fig. F1; Table T1) is in the central area drilled during the Pacific Equatorial Age Transect (PEAT) program (Expedition 320/321). Site U1336 (~32 Ma crust) is between Site U1334 ~410 km to the west and Site U1335 ~330 km to the southeast and ~100 km to the west of Deep Sea Drilling Project (DSDP) Site 78. Site U1336 is also ~30 km north of the center of the Clipperton Fracture Zone. The site survey data (Lyle et al., 2006; Pälike et al., 2008) show that Site U1336 is on abyssal hill topography draped with thick sediment (Fig. F2). The fabric of the abyssal hills is oriented slightly west of due north.

Water depth in the vicinity of Site U1336 is relatively shallow for the age of the crust, between 4200 and 4400 m. Surprisingly, the crust south of the Clipperton Fracture Zone is only 100 m deeper than the crust north of the zone, despite a water depth of nearly 5 km in the middle of the fracture zone trace. A few oblique ridges and depressed topography occur in the south of the survey area, showing some interaction between the fracture zone and the Site U1336 region. The site is thickly covered with sediment (300–400 ms two-way traveltime [TWT]) (Fig. F2) and has a very thin layer of recent to middle Miocene sediment, with frequent sediment erosion on flanks of abyssal hills. Based on correlation to the Neogene central equatorial Pacific seismic stratigraphy of Mayer et al. (1985) and the Paleogene equatorial Pacific stratigraphy of Lyle et al. (2002), we estimated ~120 m of Oligocene sediment for an average Oligocene sedimentation rate of 13 m/m.y., assuming a crustal age of 32 Ma. The total sediment thickness, using the velocity-depth conversion for DSDP Site 574 (Mayer et al., 1985) was estimated as 253 m prior to drilling.

Based on stage-pole reconstructions of Pacific plate motion, observations of basement age from previous drilling sites, and magnetic anomaly maps (Cande et al., 1989), we estimated that Site U1336 is on 32 Ma crust. The best control on age is information from Site 78, ~100 km east of Site U1336. The base of Site 78 reaches the lower Oligocene.
1-83
Integrated Ocean Drilling Program Management International, Inc
Pälike, Heiko
b9bf7798-ad8c-479b-8487-dd9a30a61fa5
Nishi, Hiroshi
8f3b93ee-0878-4e32-afe1-1d8192f09e07
Lyle, Mitchell
679ab0ed-6986-4198-b8fa-ea80793df449
Raffi, Isabella
ae99d733-dc7b-4580-95ee-f3426a6cfafb
Gamage, Kusali
7d5669f2-acf0-497e-ba4f-d1ca2615a56a
Klaus, Adam
0efdbb3a-0202-4753-b93b-c8b15a86b857
Pälike, Heiko
b9bf7798-ad8c-479b-8487-dd9a30a61fa5
Nishi, Hiroshi
8f3b93ee-0878-4e32-afe1-1d8192f09e07
Lyle, Mitchell
679ab0ed-6986-4198-b8fa-ea80793df449
Raffi, Isabella
ae99d733-dc7b-4580-95ee-f3426a6cfafb
Gamage, Kusali
7d5669f2-acf0-497e-ba4f-d1ca2615a56a
Klaus, Adam
0efdbb3a-0202-4753-b93b-c8b15a86b857

Pälike, Heiko, Nishi, Hiroshi, Lyle, Mitchell, Raffi, Isabella, Gamage, Kusali and Klaus, Adam (2010) Site U1336. In Proceedings of the Integrated Ocean Drilling Program, Volume 320/321. Integrated Ocean Drilling Program Management International, Inc. pp. 1-83 . (doi:10.2204/iodp.proc.320321.108.2010).

Record type: Conference or Workshop Item (Paper)

Abstract

Integrated Ocean Drilling Program Site U1336 (site survey PEAT-5C; 7°42.067?N, 128°15.253?W; 4286 meters below sea level [mbsl]) (Fig. F1; Table T1) is in the central area drilled during the Pacific Equatorial Age Transect (PEAT) program (Expedition 320/321). Site U1336 (~32 Ma crust) is between Site U1334 ~410 km to the west and Site U1335 ~330 km to the southeast and ~100 km to the west of Deep Sea Drilling Project (DSDP) Site 78. Site U1336 is also ~30 km north of the center of the Clipperton Fracture Zone. The site survey data (Lyle et al., 2006; Pälike et al., 2008) show that Site U1336 is on abyssal hill topography draped with thick sediment (Fig. F2). The fabric of the abyssal hills is oriented slightly west of due north.

Water depth in the vicinity of Site U1336 is relatively shallow for the age of the crust, between 4200 and 4400 m. Surprisingly, the crust south of the Clipperton Fracture Zone is only 100 m deeper than the crust north of the zone, despite a water depth of nearly 5 km in the middle of the fracture zone trace. A few oblique ridges and depressed topography occur in the south of the survey area, showing some interaction between the fracture zone and the Site U1336 region. The site is thickly covered with sediment (300–400 ms two-way traveltime [TWT]) (Fig. F2) and has a very thin layer of recent to middle Miocene sediment, with frequent sediment erosion on flanks of abyssal hills. Based on correlation to the Neogene central equatorial Pacific seismic stratigraphy of Mayer et al. (1985) and the Paleogene equatorial Pacific stratigraphy of Lyle et al. (2002), we estimated ~120 m of Oligocene sediment for an average Oligocene sedimentation rate of 13 m/m.y., assuming a crustal age of 32 Ma. The total sediment thickness, using the velocity-depth conversion for DSDP Site 574 (Mayer et al., 1985) was estimated as 253 m prior to drilling.

Based on stage-pole reconstructions of Pacific plate motion, observations of basement age from previous drilling sites, and magnetic anomaly maps (Cande et al., 1989), we estimated that Site U1336 is on 32 Ma crust. The best control on age is information from Site 78, ~100 km east of Site U1336. The base of Site 78 reaches the lower Oligocene.

Other
2021_108.PDF - Version of Record
Download (8MB)

More information

Published date: October 2010

Identifiers

Local EPrints ID: 170029
URI: http://eprints.soton.ac.uk/id/eprint/170029
PURE UUID: 7a6f274e-0280-4e17-b8c6-a7ce707cf32a

Catalogue record

Date deposited: 04 Jan 2011 15:10
Last modified: 14 Mar 2024 02:22

Export record

Altmetrics

Contributors

Author: Heiko Pälike
Author: Hiroshi Nishi
Author: Mitchell Lyle
Author: Isabella Raffi
Author: Kusali Gamage
Author: Adam Klaus

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×