Fisk, Martin R; Kelley, Katherine A (2002): Geochemistry of volcanic glass from ODP holes 129-801C and 185-801C in the western Pacific [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.710913, Supplement to: Fisk, MR; Kelley, KA (2002): Probing the Pacific´s oldest MORB glass: mantle chemistry and melting conditions during the birth of the Pacific Plate. Earth and Planetary Science Letters, 202(3-4), 741-752, https://doi.org/10.1016/S0012-821X(02)00760-4
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Abstract:
Major element chemistry of basalt from the southern East Pacific Rise (EPR) is different from that of the EPR at the time of the formation of the Pacific Plate at 170 Ma.Glass recovered from Jurassic age (170 Ma) Pacific ocean crust (Bartolini and Larson, 2001, doi:10.1130/0091-7613(2001)029<0735:PMATPS>2.0.CO;2) at Ocean Drilling Program Hole 801C records higher Fe8 (10.77 wt%) and marginally lower Na8 (2.21 wt%) compared to the modern EPR, suggesting deeper melting and a temperature of initial melting that was 60°C hotter than today.Trace element ratios such as La/Sm and Zr/Y, on the other hand, show remarkable similarities to the modern southern EPR, indicating that Site 801 was not generated on a hotspot-influenced ridge and that mantle composition has changed little in the Pacific over the past 170 Ma. Our results are consistent with the observation that mid-ocean ridge basalts (MORBs) older than 80 Ma were derived by higher temperature melting than are modern MORBs (Humler et al., 1999, doi:10.1016/S0012-821X(99)00218-6), which may have been a consequence of the Cretaceous superplume event in the Pacific.Site 801 predates the formation of Pacific oceanic plateaus and 801C basalt chemistry indicates that higher temperatures of mantle melting beneath Pacific ridges preceded the initiation of the superplume.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 18.642300 * Longitude: 156.359800
Date/Time Start: 1990-01-06T11:48:00 * Date/Time End: 1999-05-19T13:30:00
Event(s):
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 * Method/Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 100.6 m cored; 0 m drilled; 60.2 % recovery
185-801C * Latitude: 18.642300 * Longitude: 156.359800 * Date/Time Start: 1999-04-29T08:30:00 * Date/Time End: 1999-05-19T13:30:00 * Elevation: -5674.0 m * Penetration: 935.7 m * Recovery: 160.03 m * Location: North Pacific Ocean * Campaign: Leg185 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 339.3 m cored; 2.1 m drilled; 47.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Fisk, MR; Kelley, KA (2002): (Table 1) Major element chemistry of ODP holes 129-801C and 185-801C volcanic glass. https://doi.org/10.1594/PANGAEA.710910
- Fisk, MR; Kelley, KA (2002): (Table 2) Selected major and trace element chemistry of ODP holes 129-801C and 185-801C volcanic glass. https://doi.org/10.1594/PANGAEA.710912