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Tartarotti, Paola; Allerton, Simon A; Laverne, Christine (1995): Geochemistry of sheeted dike complex minerals of ODP Hole 140-504B [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.806463, Supplement to: Tartarotti, P et al. (1995): Vein formation mechanisms in the sheeted dike complex from 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, 231-243, https://doi.org/10.2973/odp.proc.sr.137140.026.1995

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Abstract:
Diabases were recovered during Legs 137 and 140 at Hole 504B from depths between 1621.5 and 2000.4 meters below seafloor in the lower sheeted dike complex. The samples contain multiple generations of millimetric to centimetric veins. The orientation of the measured veins suggests that two main vein sets exist: one characterized by shallow dipping and the other by random trend. Thermal contraction during rock cooling is considered the main mechanism responsible for fracture formation. Vein infill is related to the circulation of hydrothermal fluids near the spreading axis. Some veins are surrounded by millimeter-sized alteration halos due to fluid percolation from the fractures through the host rock. Vein-filling minerals are essentially amphibole, chlorite, and zeolites. Amphibole composition is controlled by the microstructural site of the rock. Actinolite is the main amphibole occurring in the veins and also in the groundmass away from the halos. In the alteration halos, amphibole shows composition of actinolitic hornblende and Mg-hornblende. Late-stage tension gashes and interstitial spaces in some amphibole-bearing veins are filled with zeolites, suggesting that the veins likely suffered multiple opening stages that record the cooling history of the circulating fluids. Evidence of deformation recorded by the recovered samples seems to be restricted to veins that clearly represent elements of weakness of the rock. On the basis of vein geometry and microstructure we infer structural interpretations for the formation mechanism and for deformation of veins.
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

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Datasets listed in this publication series

  1. Tartarotti, P; Allerton, SA; Laverne, C (1995): (Table 1) Representative analyses of amphibole from ODP Holes 140-504B. https://doi.org/10.1594/PANGAEA.806444
  2. Tartarotti, P; Allerton, SA; Laverne, C (1995): (Table 2) Representative analyses of secondary clinopyroxene filling the stepped-like vein from ODP Holes 140-504B. https://doi.org/10.1594/PANGAEA.806453
  3. Tartarotti, P; Allerton, SA; Laverne, C (1995): (Table 3) Representative analyses of zeolites from ODP Holes 140-504B. https://doi.org/10.1594/PANGAEA.806311