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Saboda, Kristine L; Fryer, Patricia B; Maekawa, Hirokazu (1992): Geochemistry and mineralogy of ultramafic rocks from conical seamount [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.763216, Supplement to: Saboda, KL et al. (1992): Metamorphism of Ultramafic Clasts from Conical Seamount: Sites 778, 779, and 780. In: Fryer, P; Pearce, JA; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 125, 431-443, https://doi.org/10.2973/odp.proc.sr.125.127.1992

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Abstract:
The Mariana arc-trench system, the easternmost of a series of backarc basins and intervening remnant arcs that form the eastern edge of the Philippine Sea Plate, is a well-known example of an intraoceanic convergence zone. Its evolution has been studied by numerous investigators over nearly two decades (e.g., Kang, 1971; Uyeda and Kanamori, 1979; LaTraille and Hussong, 1980; Fryer and Hussong, 1981; Mrosowski et al., 1982; Hussong and Uyeda, 1981; Bloomer and Hawkins,
1983; Karig and Ranken, 1983; McCabe and Uyeda, 1983; Hsui and Youngquist, 1985; Fryer and Fryer, 1987; Johnson and Fryer, 1988; Johnson and Fryer, 1989; Johnson et al., 1991). The Mariana forearc has undergone extensive vertical uplift and subsidence in response to seamount collision, to tensional and rotational fracturing associated with adjustments to plate subduction, and to changes in the configuration of the arc (Hussong and Uyeda, 1981; Fryer et al., 1985). Serpentine seamounts, up to 2500 m high and 30 km in diameter, occur in a broad zone along the outer-arc high (Fryer et al., 1985; Fryer and Fryer, 1987). These seamounts may be horsts of serpentinized ultramafic rocks or may have been formed by the extrusion of serpentine muds. Conical Seamount, one of these serpentine seamounts, is located within this broad zone of forearc seamounts, about 80 km from the trench axis, at about 19°30'N. The seamount is approximately 20 km in diameter and rises 1500 m above the surrounding seafloor. Alvin submersible, R/V Sonne bottom photography, seismic reflection, and SeaMARC II studies indicate that the surface of this seamount is composed of unconsolidated serpentine muds that contain clasts of serpentinized ultramafic and metamorphosed mafic rocks, and authigenic carbonate and silicate minerals (Saboda et al., 1987; Haggerty, 1987; Fryer et al., 1990; Saboda, 1991).
During Leg 125, three sites were drilled (two flank sites and one summit site) on Conical Seamount to investigate the origin and evolution of the seamount.
Site 778 (19°29.93'N, 146°39.94'E) is located in the midflank region of the southern quadrant of Conical Seamount at a depth of 3913.7 meters below sea level (mbsl) (Fig. 2). This site is located in the center of a major region of serpentine flows (Fryer et al., 1985, 1990). Site 779 (19°30.75'N, 146°41.75'E), about 3.5 km northeast of Site 778, is located approximately in the midflank region of the southeast quadrant of Conical Seamount, at a depth of 3947.2 mbsl. This area is mantled by a pelagic sediment cover, overlying exposures of unconsolidated serpentine muds that contain serpentinized clasts of mafic and ultramafic rocks (Fryer et al., 1985, 1990). Site 780 (19°32.5'N, 146°39.2'E) is located on the western side of Conical Seamount near the summit, at a depth of 3083.4 mbsl. This area is only partly sediment covered and lies near active venting fields where chimney structures are forming (Fryer et al., 1990).
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 19.517117 * Median Longitude: 146.674433 * South-bound Latitude: 19.499000 * West-bound Longitude: 146.653500 * North-bound Latitude: 19.542200 * East-bound Longitude: 146.696000
Date/Time Start: 1989-02-22T06:30:00 * Date/Time End: 1989-03-09T04:30:00
Event(s):
125-778A * Latitude: 19.499000 * Longitude: 146.666000 * Date/Time Start: 1989-02-22T06:30:00 * Date/Time End: 1989-02-24T19:25:00 * Elevation: -3924.0 m * Penetration: 107.6 m * Recovery: 22.8 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 107.6 m cored; 0 m drilled; 21.2 % recovery
125-779A * Latitude: 19.512500 * Longitude: 146.696000 * Date/Time Start: 1989-02-28T10:00:00 * Date/Time End: 1989-03-04T03:00:00 * Elevation: -3958.0 m * Penetration: 317.2 m * Recovery: 73.24 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 317.2 m cored; 0 m drilled; 23.1 % recovery
125-780C * Latitude: 19.542200 * Longitude: 146.653500 * Date/Time Start: 1989-03-06T05:00:00 * Date/Time End: 1989-03-09T04:30:00 * Elevation: -3095.0 m * Penetration: 163.5 m * Recovery: 14.44 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 163.5 m cored; 0 m drilled; 8.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
10 datasets

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Datasets listed in this publication series

  1. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 8) Variations in mineralogy of ultramafic rocks in ODP Hole 125-778A. https://doi.org/10.1594/PANGAEA.763212
  2. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 2) Major and trace-element content of ultramafic rocks from ODP Hole 125-778A. https://doi.org/10.1594/PANGAEA.763206
  3. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 5) Mineralogy results of group 1 samples of ODP Hole 125-779A. https://doi.org/10.1594/PANGAEA.763209
  4. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 9) Variations in mineralogy of ultramafic rocks in ODP Hole 125-779A. https://doi.org/10.1594/PANGAEA.763213
  5. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 3) Major and trace-element content of ultramafic rocks from ODP Hole 125-779A. https://doi.org/10.1594/PANGAEA.763207
  6. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 10) Variations in mineralogy of ultramafic rocks in ODP Hole 125-780C. https://doi.org/10.1594/PANGAEA.763215
  7. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 4) Major and trace-element content of ultramafic rocks from ODP Hole 125-780C. https://doi.org/10.1594/PANGAEA.763208
  8. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 6) Mineralogy results of group 2 ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.763210
  9. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 7) Mineralogy results of group 3 ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.763211
  10. Saboda, KL; Fryer, PB; Maekawa, H (1992): (Table 1) Modal mineralogy of ultramafic rocks from ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.763205