Seifert, Karl E; Vallier, Tracy L; Windom, Kenneth E; Morgan, S R (1981): (Table 2) Geochemistry at DSDP Holes 62-464 and 62-465A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.819812, Supplement to: Seifert, KE et al. (1981): Geochemistry and petrology of igneous rocks, Deep Sea Drilling Project Leg 62. In: Thiede, J; Vallier, TL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 62, 945-953, https://doi.org/10.2973/dsdp.proc.62.149.1981
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Abstract:
Igneous rocks were recovered from three sites on Hess Rise during Deep Sea Drilling Project Leg 62: altered basalt at Site 464, at the northern end of Hess Rise; and altered trachyte from Site 465, and rounded basalt pebbles in upper Albian to middle Miocene sediments from Site 466, both at the southern end of Hess Rise. Major-, minor-, and trace-element data for basalt from Hole 464 are consistent with these rocks being transitional tholeiites that have undergone low-temperature alteration by reaction with sea water. Trachyte from Hole 465A exhibits as many as three generations of plagioclase along with potash feldspar that are flow aligned in groundmasses alterted to smectites and random mixed-layer clays. Textural evidence indicates that these rocks were eruped subaerially. Chemical data show a range of values when plotted on two- and three-component variation diagrams. The observed variations may result in part from differentiation, but they also reflect the high degree of alteration. Several oxides and elements show strong correlation with H2O+: K2O, SiO2, Rb and Lu decrease and MgO increases with increasing H2O+. These trends, except for that of Lu, are consistent with experimentally determined changes in chemistry that accompany alteration. The trend for Lu has not been previously reported; it may result from a more-intense alteration of the HREE-rich mafic minerals than of the LREE-rich feldspars. Despite their alteration, the trachytes compare favorably with alkalic differentiates from oceanic islands.
We interpret Hess Rise as a volcanic platform formed by eruption of off-ridge volcanic rocks onto MORB oceanic crust during the Aptian and Albian stages, after the basement had migrated away from the spreading center. By analogy with present oceanic islands, we propose that early tholeiitic basalts were followed by alkalic basalts and their differentiation products (trachytes), producing a volcanic archipelago of islands and seamounts. Subsequent tectonism and subsidence led to the present state of Hess Rise.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 36.840600 * Median Longitude: 176.403900 * South-bound Latitude: 33.820500 * West-bound Longitude: 173.888800 * North-bound Latitude: 39.860700 * East-bound Longitude: 178.919000
Date/Time Start: 1978-08-17T00:00:00 * Date/Time End: 1978-08-23T00:00:00
Minimum Elevation: -4637.0 m * Maximum Elevation: -2161.0 m
Event(s):
62-464 * Latitude: 39.860700 * Longitude: 173.888800 * Date/Time: 1978-08-17T00:00:00 * Elevation: -4637.0 m * Penetration: 308.5 m * Recovery: 77.6 m * Location: North Pacific/CONT RISE * Campaign: Leg62 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 34 cores; 308.5 m cored; 0 m drilled; 25.2 % recovery
62-465A * Latitude: 33.820500 * Longitude: 178.919000 * Date/Time: 1978-08-23T00:00:00 * Elevation: -2161.0 m * Penetration: 476 m * Recovery: 98.9 m * Location: North Pacific/CONT RISE * Campaign: Leg62 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 408.5 m cored; 9.5 m drilled; 24.2 % recovery
Comment:
Empty cells = no data.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Seifert, Karl E | DSDP/ODP/IODP sample designation | ||
| 3 | Sample ID | Sample ID | Seifert, Karl E | |||
| 4 | Silicon dioxide | SiO2 | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 5 | Titanium dioxide | TiO2 | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 6 | Aluminium oxide | Al2O3 | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 7 | Iron oxide, Fe2O3 | Fe2O3 | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 8 | Iron oxide, FeO | FeO | % | Seifert, Karl E | X-ray fluorescence (XRF) | # = Total iron |
| 9 | Manganese oxide | MnO | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 10 | Magnesium oxide | MgO | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 11 | Calcium oxide | CaO | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 12 | Sodium oxide | Na2O | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 13 | Potassium oxide | K2O | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 14 | Phosphorus pentoxide | P2O5 | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 15 | Water in rock | H2O | % | Seifert, Karl E | X-ray fluorescence (XRF) | H2O+, structural part, similar to LOI |
| 16 | Water in rock | H2O | % | Seifert, Karl E | X-ray fluorescence (XRF) | H2O-, hydration part |
| 17 | Carbon dioxide | CO2 | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 18 | Total | Total | % | Seifert, Karl E | X-ray fluorescence (XRF) | |
| 19 | Lanthanum | La | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 20 | Cerium | Ce | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 21 | Samarium | Sm | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 22 | Europium | Eu | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 23 | Terbium | Tb | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 24 | Ytterbium | Yb | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 25 | Lutetium | Lu | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 26 | Scandium | Sc | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 27 | Cobalt | Co | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 28 | Thorium | Th | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 29 | Hafnium | Hf | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 30 | Tantalum | Ta | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 31 | Zirconium | Zr | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 32 | Rubidium | Rb | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 33 | Barium | Ba | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) | |
| 34 | Strontium | Sr | mg/kg | Seifert, Karl E | Instrumental neutron activation analysis (INAA) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
702 data points