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Site 1221

Site 1221
Site 1221
Site 1221 (12°01.999´N, 143°41.572´W; 5175 meters below sea level (mbsl); Fig. F1) forms an equatorial component of the 56-Ma transect drilled during Leg 199 and is situated about three-quarters of the way between the Clipperton and Clarion Fracture Zones in typical abyssal hill topography. On the basis of regional magnetic anomalies, we anticipated the basement age at Site 1221 to be equivalent to Chron C25n (~56 Ma) (Cande et al., 1989), about the same age as Site 1220. At the outset of drilling at Site 1221, our estimate for total sediment thickness was ~150 meters below seafloor (mbsf) (Fig. F2).

Based upon a fixed hotspot model (Gripp and Gordon, 1990, for the 0- to 5-Ma Pacific hotspot rotation pole; Engebretson et al., 1985, for older poles), Site 1221 should have been located about 1° south of the equator at 56 Ma (in an equatorial position at ~50 Ma) and ~2°N at 40 Ma. Thus, Site 1221 should have been situated underneath the South Equatorial Current in the early Eocene. A nearby piston core (EW9709-14PC) taken during the site survey cruise recovered >11 m of red clay with the base of the core containing a calcareous radiolarian ooze dated as early Oligocene age on the basis of radiolarian biostratigraphy (Lyle, 2000).

Site 1221 will be used to study equatorial ocean circulation from the late Paleocene through the late Eocene during the early Cenozoic thermal maximum. Sediment records from this site will help to define the carbonate compensation depth (CCD) during the Paleocene-Eocene and Eocene-Oligocene transitions. In this and other respects, Site 1221 will act as an interesting analog to Site 1220. The two sites are situated on similar age crust and exhibit similar seismic-stratigraphic sequences, but Site 1221 is thought to have crossed the equator ~5 m.y. earlier than Site 1220, during latest early Eocene time (~50 Ma).
ISSN10962158
65pp
Texas A & M University Ocean Drilling Program (CDROM)
Backman, J.
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Busch, W.H.
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Coxall, H.K.
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Faul, K.
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Gaillot, P.A.
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Hovan, S.A.
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Janecek, T.R.
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Knoop, P.
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Kruse, S.
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Lanci, L.
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Lear, C.H.
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Lyle, M.
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Moore, T.C.
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Nigrini, C.A.
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Nishi, H.
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Norris, R.D.
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Pälike, H.
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Parés, J.M.
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Raffi, I.
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Rea, D.K.
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Steiger, T.H.
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Tripati, A.K.
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Vanden Berg, M.D.
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Wade, B.S.
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Wilson, P.A.
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Lyle, M.
Wilson, P.A.
Janecek, T.R.
Backman, J.
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Busch, W.H.
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Coxall, H.K.
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Faul, K.
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Gaillot, P.A.
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Hovan, S.A.
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Janecek, T.R.
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Knoop, P.
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Kruse, S.
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Lanci, L.
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Lear, C.H.
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Lyle, M.
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Moore, T.C.
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Nigrini, C.A.
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Nishi, H.
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Nomura, R.
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Norris, R.D.
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Pälike, H.
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Parés, J.M.
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Quintin, L.
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Raffi, I.
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Rea, B.R.
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Rea, D.K.
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Steiger, T.H.
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Tripati, A.K.
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Vanden Berg, M.D.
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Wade, B.S.
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Wilson, P.A.
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Lyle, M.
Wilson, P.A.
Janecek, T.R.

Backman, J., Busch, W.H., Coxall, H.K., Faul, K., Gaillot, P.A., Hovan, S.A., Janecek, T.R., Knoop, P., Kruse, S., Lanci, L., Lear, C.H., Lyle, M., Moore, T.C., Nigrini, C.A., Nishi, H., Nomura, R., Norris, R.D., Pälike, H., Parés, J.M., Quintin, L., Raffi, I., Rea, B.R., Rea, D.K., Steiger, T.H., Tripati, A.K., Vanden Berg, M.D., Wade, B.S. and Wilson, P.A. (2002) Site 1221. Lyle, M., Wilson, P.A. and Janecek, T.R. (eds.) In Proceedings of the Ocean Drilling Program, Initial Reports. Vol. 199. Paleogene Equatorial Transect. Covering Leg 199 of the cruises of the Drilling Vessel "Joides Resolution", Honolulu, Hawaii, to Honolulu, Hawaii, Sites 1215-1222, 23 Oct-16 Dec 2001. Texas A & M University Ocean Drilling Program (CDROM). 65pp . (doi:10.2973/odp.proc.ir.199.114.2002).

Record type: Conference or Workshop Item (Paper)

Abstract

Site 1221 (12°01.999´N, 143°41.572´W; 5175 meters below sea level (mbsl); Fig. F1) forms an equatorial component of the 56-Ma transect drilled during Leg 199 and is situated about three-quarters of the way between the Clipperton and Clarion Fracture Zones in typical abyssal hill topography. On the basis of regional magnetic anomalies, we anticipated the basement age at Site 1221 to be equivalent to Chron C25n (~56 Ma) (Cande et al., 1989), about the same age as Site 1220. At the outset of drilling at Site 1221, our estimate for total sediment thickness was ~150 meters below seafloor (mbsf) (Fig. F2).

Based upon a fixed hotspot model (Gripp and Gordon, 1990, for the 0- to 5-Ma Pacific hotspot rotation pole; Engebretson et al., 1985, for older poles), Site 1221 should have been located about 1° south of the equator at 56 Ma (in an equatorial position at ~50 Ma) and ~2°N at 40 Ma. Thus, Site 1221 should have been situated underneath the South Equatorial Current in the early Eocene. A nearby piston core (EW9709-14PC) taken during the site survey cruise recovered >11 m of red clay with the base of the core containing a calcareous radiolarian ooze dated as early Oligocene age on the basis of radiolarian biostratigraphy (Lyle, 2000).

Site 1221 will be used to study equatorial ocean circulation from the late Paleocene through the late Eocene during the early Cenozoic thermal maximum. Sediment records from this site will help to define the carbonate compensation depth (CCD) during the Paleocene-Eocene and Eocene-Oligocene transitions. In this and other respects, Site 1221 will act as an interesting analog to Site 1220. The two sites are situated on similar age crust and exhibit similar seismic-stratigraphic sequences, but Site 1221 is thought to have crossed the equator ~5 m.y. earlier than Site 1220, during latest early Eocene time (~50 Ma).

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Published date: 2002

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Local EPrints ID: 41910
URI: http://eprints.soton.ac.uk/id/eprint/41910
ISBN: ISSN10962158
PURE UUID: e080e0ce-84d9-4907-a2c0-e87073bcd40d

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Date deposited: 16 Oct 2006
Last modified: 23 Jul 2020 16:48

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Contributors

Author: J. Backman
Author: W.H. Busch
Author: H.K. Coxall
Author: K. Faul
Author: P.A. Gaillot
Author: S.A. Hovan
Author: T.R. Janecek
Author: P. Knoop
Author: S. Kruse
Author: L. Lanci
Author: C.H. Lear
Author: M. Lyle
Author: T.C. Moore
Author: C.A. Nigrini
Author: H. Nishi
Author: R. Nomura
Author: R.D. Norris
Author: H. Pälike
Author: J.M. Parés
Author: L. Quintin
Author: I. Raffi
Author: B.R. Rea
Author: D.K. Rea
Author: T.H. Steiger
Author: A.K. Tripati
Author: M.D. Vanden Berg
Author: B.S. Wade
Author: P.A. Wilson
Editor: M. Lyle
Editor: P.A. Wilson
Editor: T.R. Janecek

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