Location of Repository

Site 1219

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

Abstract

ite 1219 (7°48.019´N, 142°00.940´W; 5063 meters below sea level [mbsl]; Fig. F1) is the southernmost site to be drilled on the 56-Ma transect during Leg 199 and is situated ~3° to the north of the Clipperton Fracture Zone on abyssal hill topography. The age of basement at Site 1219 was poorly constrained prior to Leg 199 because little reliable magnetic anomaly data are available between the Clipperton and Clarion Fracture Zones (Cande et al., 1989). At the outset of Leg 199, based on one interpretation of the location of magnetic Anomaly C25r (~57 Ma) (Petronotis et al., 1994), previous drilling, and assumed spreading rates, we estimated the age of basement at Site 1219 to be ~55 Ma. Site 1219 is the only site to be drilled during Leg 199 that features all of the seismic horizons identified for a Paleogene equatorial seismic stratigraphy (Lyle et al., this volume), and an estimate of sediment thickness at Site 1219 prior to drilling (based upon the seismic reflection profile; Fig. F2) was 270-290 meters below seafloor (mbsf), depending on which reflection was chosen as basement. <br/><br/> Based upon a fixed hotspot model (Gripp and Gordon, 1990, for 0- to 5-Ma Pacific hotspot rotation pole; Engebretson et al., 1985, for older poles), Site 1219 should have been within 2° of the equator between 40 and 21 Ma and should have crossed the equator at 29 Ma. Thus, the sediments should record equatorial conditions from the late middle Eocene to the early Miocene. In addition, Site 1219 should provide an analog for Site 1218, except that it is on older deeper crust. <br/><br/> Site 1219 will be used to study near-equatorial ocean circulation from the late Paleocene to the late Eocene including deepwater flow and sea-surface properties. Sediment records from this site will help to define the carbonate compensation depth (CCD) and lysocline during the Eocene-Oligocene transition and near the Oligocene/Miocene (O/M) boundary. Based on the results from a site survey piston core (EW3709-12PC; Lyle, 2000) taken a few kilometers to the southwest, we anticipated that Site 1219 passed below the CCD in the early Miocene. The basement at Site 1219 should have formed in the Southern Hemisphere, and changes in magnetic inclination at this site will be important to define the position of the equator in the early Eocene

Topics: QE
Publisher: Texas A & M University Ocean Drilling Program (CDROM)
Year: 2002
OAI identifier: oai:eprints.soton.ac.uk:41909
Provided by: e-Prints Soton

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Citations

  1. (2000). (mg/cm2/k.y.) Lithologic Unit I Lithologic Unit II Lithologic Unit III Lithologic Unit IVSHIPBOARD SCIENTIFIC PARTY CHAPTER 12, SITE 1219 69 Figure F25. Interstitial water data from Site 1219. Solid circles
  2. 210.20 210.29 Soupy 25X-CC, 26–33 226.81 226.88 Chert 199-1219B2H-1, 0–10 21.00 21.10 Flow-in 2H-1,
  3. (1994). A 57 Ma Pacific plate paleomagnetic pole determined from a skewness analysis of crossings of marine magnetic Anomaly 25r.
  4. (1998). A practical guide to wavelet analysis.
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  6. (2000). Astronomical calibration age for the Oligocene–Miocene boundary.
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  9. (1998). Code numbers for Cenozoic low latitude radiolarian biostratigraphic zones and GPTS conversion tables.
  10. (1990). Current plate velocities relative to the hotspots incorporating the NUVEL-1 global plate motion model.
  11. (2000). Data submission to ODP Pollution Prevention and Safety Panel: proposed drill sites for
  12. (1992). Development of composite depth sections for Sites 844 through 854. In
  13. Figure F13. Archive-half magnetization intensities after AF demagnetization at a peak field of 20 mT from Holes 1219A and 1219B. Intensity (A/m) D e p t h ( m c d ) Hole 1219A Hole
  14. Group abundance: A =
  15. (1993). Heat flow from the earth's interior: analysis of the global data set.
  16. (1973). Low-latitude coccolith biostratigraphic zonation. In
  17. Max 0 Max in phase out of phase
  18. Miocene to Holocene A B Radiolarian ooze and clay Calcareous chalk N a n n o f o s s i l o o z e w i t h v a r i a b l e a m o u n t s o f r a d i o l a r i a n s a n d c l a y Radiolarian ooze Chert zeolitic clay
  19. (1995). Paleogene to Neogene deep-sea paleoceanography in the eastern Indian Ocean: Benthic foraminifera from ODP Sites 747, 757, and 758.
  20. (1973). Printing Office).
  21. (1995). Radiolarian stratigraphy across the Oligocene/ Miocene transition.
  22. (1995). Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous
  23. (1985). Seismic modelling and paleoceanography at Deep Sea Drilling Project Site 574.
  24. (2000). SITE 1219 66 Figure F22. LSRs and chronostratigraphic markers for Site 1219.
  25. SITE 1219 73 Figure F29. Comparison of MST gamma ray attenuation (GRA) bulk density, PWL velocity, and MS with light–dark cycles found in Sections 199-1219A-6H-2 through 6H-6. D e p t h ( m b s f )
  26. SITE 1219 78 Figure F34. Thermal conductivity for Holes 1219A (solid symbols) and 1219B (open symbols). Lithologic Units I–V are noted on the right side of the figure.
  27. SITE 1219 82 Figure F38. MS for Hole 1219A. Lithologic Units I–V are noted on the right side of the figure.
  28. SITE 1219 83 Figure F39. Summary of logging operations at Hole 1219A. MGT = multisensor gamma ray tool,
  29. (1980). Supplementary modification and introduction of code numbers to the low-latitude coccolith biostratigraphic zonation (Bukry,
  30. (2002). the CD-ROM version of this volume was published, errors were noted in the ASCII versions of Tables T2, T5, T7, T12, T14, and T18. This version contains the corrected ASCII files
  31. (1985). The Continental Crust: Its Composition and Evolution:
  32. (2000). Thermal data collection and heat flow recalculations for ODP Legs 101–180. Institute for Joint Geoscientific Research,
  33. This table is also available
  34. (1219). This table is also available in ASCII. [N1] Core, section, interval (cm) Depth (mbsf) pH Alkalinity (mM) Salinity Cl (mM) Na (mM) K (mM) Ca (mM) Mg (mM) SO4 (mM) NH4 (µM) H4SiO4 (µM) Sr (µM) Li (µM) Mn (µM) Ba (µM) B (µM) 199-1219A1H-2,
  35. This table is also available in ASCII. [N1] Marker species/ Zonal boundaries Age (Ma) Depth (mcd) Midpoint ± Nannofossil events: T Cyclicargolithus floridanus 13.20
  36. This table is also available in ASCII. Chron/ Subchron Age (Ma) Depth (mcd)
  37. (1219). This table is also available in ASCII. Core Length (m) Depth (mbsf) Offset (m) Depth (mcd)
  38. (1219). This table is also available in ASCII. Core, section, interval (cm) Depth (mbsf) Thermal conductivity (W/[m·K
  39. (1995). timescale, 900 k.y. subtracted from age estimates for Triquetrorhabdulus carinatus acme and Cyclicargolithus abisectus acme.
  40. (1995). top or highest occurrence, B = bottom or first occurrence. Ages are those of

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