Floyd, Peter A; Castillo, Paterno R (1992): Geochemistry of basaltic rocks from ODP Site 129-801. PANGAEA, https://doi.org/10.1594/PANGAEA.779154, Supplement to: Floyd, PA; Castillo, PR (1992): Geochemistry and petrogenesis of Jurassic ocean crust basalts, Site 801. In: Larson, RL; Lancelot, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 129, 361-388, https://doi.org/10.2973/odp.proc.sr.129.129.1992
Always quote above citation when using data! You can download the citation in several formats below.
Middle Jurassic basaltic lavas obtained from Site 801 in the western Pacific Pigafetta Basin represent ocean crust from the oldest segment of the present-day Pacific Ocean. A composite 131 m section shows the basement to be composed of an upper alkalic basalt sequence (about 157 Ma) with ocean island basalt chemical features and a lower tholeiitic basalt sequence (about 167 Ma) with typical normal-type mid-ocean ridge basalt features. The basalt sequences are separated by a quartz-cemented, yellow goethite hydrothermal deposit. Most basalts are altered to some degree and exhibit variable, low-grade smectite-celadonite-pyrite-carbonate-zeolite assemblages developed under a mainly hydrated anoxic environment. Oxidation is very minor, later in development than the hydration assemblages, and largely associated with the hydrothermal deposit. The tholeiitic normal-type mid-ocean ridge basalt has characteristically depleted incompatible element patterns and all compositions are encompassed by recent mid-ocean ridge basalt from the East Pacific Rise. Chemically, the normal-type mid-ocean ridge basalt is divided into a primitive plagioclase-olivine +/- spinel phyric group (Mg* = 72-60) and an evolved (largely) aphyric group of olivine tholeiites (Mg* = 62-40). Both groups form a single comagmatic suite related via open-system fractionation of initial olivine-spinel followed by olivine-plagioclase-clinopyroxene. The alkalic ocean island basalt are largely aphyric and display enriched incompatible element abundances within both relatively primitive olivine-rich basalts and evolved olivine-poor hawaiites related via mafic fractionation. In gross terms, the basement lithostratigraphy is a typical mid-ocean ridge basalt crust, generated at a spreading center, overlain by an off-axis seamount with ocean island basalt chemical characters.
Median Latitude: 17.551200 * Median Longitude: 155.834850 * South-bound Latitude: 12.096300 * West-bound Longitude: 153.210300 * North-bound Latitude: 18.642300 * East-bound Longitude: 156.359800
Date/Time Start: 1989-12-09T17:00:00 * Date/Time End: 1990-01-16T07:15:00
129-801B * Latitude: 18.642000 * Longitude: 156.359700 * Date/Time Start: 1989-12-09T17:00:00 * Date/Time End: 1989-12-17T01:15:00 * Elevation: -5685.0 m * Penetration: 511.2 m * Recovery: 59.17 m * Location: North Pacific Ocean * Campaign: Leg129 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 44 cores; 317.2 m cored; 0 m drilled; 18.7 % recovery
129-801C * Latitude: 18.642300 * Longitude: 156.359800 * Date/Time Start: 1990-01-06T11:48:00 * Date/Time End: 1990-01-16T07:15:00 * Elevation: -5685.0 m * Penetration: 594.3 m * Recovery: 60.6 m * Location: North Pacific Ocean * Campaign: Leg129 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 100.6 m cored; 0 m drilled; 60.2 % recovery
129-802A * Latitude: 12.096300 * Longitude: 153.210300 * Date/Time Start: 1989-12-25T10:15:00 * Date/Time End: 1990-01-04T17:20:00 * Elevation: -5980.0 m * Penetration: 559.8 m * Recovery: 165.01 m * Location: North Pacific Ocean * Campaign: Leg129 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 559.8 m cored; 0 m drilled; 29.5 % recovery