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Lustrino, Michele (2006): Composition and structural formulas of ODP Site 200-1224 Eocene ferrobasalt minerals [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.773388, Supplement to: Lustrino, M (2006): Composition, petrography, and mineral chemistry of ODP Site 1224 Eocene ferrobasalts (Leg 200; North Pacific Ocean). In: Kasahara, J; Stephen, RA; Acton, GD; Frey, FA (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 200, 1-36, https://doi.org/10.2973/odp.proc.sr.200.008.2006

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Abstract:
The ~46-m.y.-old igneous basement cored during Leg 200 in the North Pacific represents one of the few cross sections of Pacific oceanic crust with a total penetration into basalt of >100 m. The rocks, emplaced during the Eocene at a fast-spreading rate (~14 cm/yr; full rate) are strongly differentiated tholeiitic basalts (ferrobasalts) with 7-4.5 wt% MgO, relatively high TiO2 (2-3.5 wt%), and total iron as Fe2O3 (9.1-16.8 wt%). The differentiated character of these lavas is related to unusually large amounts of crystallization differentiation of plagioclase, clinopyroxene, and olivine.
The lithostratigraphy of the basement (cored to ~170 meters below seafloor) is divided into three units. The deepest unit (lithologic Unit 3), is a succession of lava flows of no more that a few meters thickness each. The intermediate unit (lithologic Unit 2) is represented by intermixed thin flows and pillows, whereas the shallowest unit (lithologic Unit 1), comprises two massive flows. The rocks range from aphyric to sparsely clinopyroxene-plagioclase-phyric (phenocryst content = <3 vol%) and from holocrystalline to hypohyaline. Chilled margins of pillow fragments show holohyaline to sparsely vitrophyric textures.
Site 1224 oxide minerals present a type of alteration not previously seen, where titanomagnetite is only partially destroyed and the pure magnetite component is partially removed from the mineral, leaving, in the most extreme case, a nearly pure ulvöspinel residuum. As a result of this dissolution, iron, mainly in the oxidized state, is added to the circulating solvent fluids. This means that a considerable metal source can result from low-temperature reactions throughout the upper ocean crust.
The coarsest-grained lithologic Unit 1 rocks have interstitial myrmekitic intergrowths of quartz and sodic plagioclase (~An12), roughly similar in mineralogy and bulk composition to tonalite/trondhjemite veinlets in abyssal gabbros from the southwest Indian Ocean and Hess Deep, eastern equatorial Pacific. Based on idiomorphic relationships and projections into the simplified Q-Ab-Or-H2O granite ternary system, the myrmekitic intergrowths formed at the same time as, or just after, the oxide minerals coprecipitated and at low water vapor pressure (~0.5 kbar). Their compositions correspond to SiO2-oligoclase intergrowths that are considerably less potassic than dacitic glasses that erupt, although rarely, along the East Pacific Rise or that have been produced experimentally by partial melting of gabbro. Based on the crystallization history and comparison to experimental data, the original interstitial siliceous liquids resulted from late-stage immiscible separation of siliceous and iron-rich liquids. The rare andesitic lavas found along the East Pacific Rise may be hybrid rocks formed by mixing of these immiscible siliceous melts with basaltic magma.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 27.889428 * Median Longitude: 141.979250 * South-bound Latitude: 27.889380 * West-bound Longitude: 141.979200 * North-bound Latitude: 27.889500 * East-bound Longitude: 141.979280
Date/Time Start: 2001-12-26T08:45:00 * Date/Time End: 2002-01-13T18:17:00
Event(s):
200-1224A * Latitude: 27.889480 * Longitude: 141.979230 * Date/Time Start: 2001-12-26T08:45:00 * Date/Time End: 2001-12-29T05:30:00 * Elevation: -4966.1 m * Penetration: 32.2 m * Recovery: 1.67 m * Location: North Pacific Ocean * Campaign: Leg200 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 32.2 m cored; 0 m drilled; 5.2 % recovery
200-1224D * Latitude: 27.889500 * Longitude: 141.979200 * Date/Time Start: 2001-12-30T18:30:00 * Date/Time End: 2002-01-13T18:17:00 * Elevation: -4967.1 m * Penetration: 64.7 m * Recovery: 15.65 m * Location: North Pacific Ocean * Campaign: Leg200 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 33.5 m cored; 31.2 m drilled; 46.7 % recovery
200-1224E * Latitude: 27.889380 * Longitude: 141.979280 * Date/Time: 2001-12-30T00:00:00 * Elevation: -4967.1 m * Penetration: 36.7 m * Recovery: 14.91 m * Location: North Pacific Ocean * Campaign: Leg200 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 28.7 m cored; 8 m drilled; 52 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Lustrino, M (2006): (Table T2) Clinopyroxene compositions and structural formulas of ODP Site 200-1224 Eocene ferrobasalts. https://doi.org/10.1594/PANGAEA.773357
  2. Lustrino, M (2006): (Table T3) Olivine microphenocryst composition of ODP Site 200-1224 Eocene ferrobasalts. https://doi.org/10.1594/PANGAEA.773359
  3. Lustrino, M (2006): (Table T4) Composition of opaque minerals of ODP Site 200-1224 Eocene ferrobasalts. https://doi.org/10.1594/PANGAEA.773360
  4. Lustrino, M (2006): (Table T1) Plagioclase compositions and structural formulas of ODP Site 200-1224 Eocene ferrobasalts. https://doi.org/10.1594/PANGAEA.773355
  5. Lustrino, M (2006): (Table T5) Composition of volcanic glass and palagonite of ODP Site 200-1224 Eocene ferrobasalts. https://doi.org/10.1594/PANGAEA.773361
  6. Lustrino, M (2006): (Table T6) Composition of myrmekitic intergrowth and zeolite of ODP Site 200-1224 Eocene ferrobasalts. https://doi.org/10.1594/PANGAEA.773363