Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Gorton, Michael P; Schandl, Eva S; Naldrett, AJ (1995): Platinum group elements and geochemistry of altered oceanic crust of ODP Hole 140-504B [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.806614, Supplement to: Gorton, MP et al. (1995): Platinum group element (PGE) concentrations in a sheeted dike complex and geochemical changes during alteration of the lowermost part of a 2-km-thick oceanic crust, Hole 504B. In: Erzinger, J; Becker, K; Dick, HJB; Stokking, LB (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 137, 199-205, https://doi.org/10.2973/odp.proc.sr.137140.012.1995

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
Primary chemical heterogeneity in the sheeted dike complex in Deep Sea Drilling Project Hole 504B makes these rocks unsuitable for conventional mass balance calculations in determining element mobility associated with hydrothermal alteration. Due to the original heterogeneity and variable degrees of fractionation in the dikes, an appropriate reference sample on which calculations can be based is difficult to find. Therefore, the use of incompatible element ratios is developed to evaluate geochemical changes during alteration(s). For example, on a Zr/Yb-La/Yb plot, scatter along a straight line suggests tapping of a variably depleted mantle source and deviation from the line suggests element mobility (gain or loss). Using this method, our data indicates that the hydrothermal evolution of the sheeted dike complex was accompanied by significant loss of Cu, Zn, and Ti and some loss of La.
The sheeted dike complex has low platinum group element (PGE) concentrations and steep PGE patterns, typical of mid-ocean ridge basalts (MORBs) on the global scale. We propose that the unusual PGE patterns of MORBs cannot be entirely generated by a partial melting and sulfide segregation model; instead, these patterns in part must have been inherited from their mantle source. The Au data show no evidence for mobilization during hydrothermal alteration of the dikes.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 1.226900 * Longitude: -83.730300
Date/Time Start: 1991-10-01T08:50:00 * Date/Time End: 1991-11-12T04:10:00
Event(s):
140-504B * Latitude: 1.226900 * Longitude: -83.730300 * Date/Time Start: 1991-10-01T08:50:00 * Date/Time End: 1991-11-12T04:10:00 * Elevation: -3474.0 m * Penetration: 2000.4 m * Recovery: 47.69 m * Location: North Pacific Ocean * Campaign: Leg140 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 55 cores; 378.9 m cored; 0 m drilled; 12.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Gorton, MP; Schandl, ES; Naldrett, AJ (1995): (Table 2) Chemical anayses of diabases of ODP Hole 140-504B. https://doi.org/10.1594/PANGAEA.806612
  2. Gorton, MP; Schandl, ES; Naldrett, AJ (1995): (Table 3) Losses in copper and zinc of diabases of ODP Hole 140-504B. https://doi.org/10.1594/PANGAEA.806613
  3. Gorton, MP; Schandl, ES; Naldrett, AJ (1995): (Table 1) Platinum group elements, copper and nickel concentrations in diabases of ODP Hole 140-504B. https://doi.org/10.1594/PANGAEA.806611