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Blanc, Gérard (1994): Geochemistry of Lau Backarc Basin sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803135, Supplement to: Blanc, G (1994): Geochemical studies on selected sediment samples from the Lau backarc basin: Evidence for hydrothermal ponded sediments. In: Hawkins, J; Parson, L; Allan, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 135, 689-707, https://doi.org/10.2973/odp.proc.sr.135.124.1994

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Abstract:
Major and minor (Mn, Sr, Ba, V, Cr, Ni, Co, Zn, Cu, Zr, Y, Sc) elements and mineralogic compositions were determined on bulk sediments collected during Ocean Drilling Program Leg 135. Three classes of sediment samples from holes drilled in the Lau Basin are discriminated by mineralogy and major element data. Samples labeled Class 1 are significantly enriched in biogenic calcite and occur predominantly in the northern part of the basin (Sites 834-835), whereas those of Class 3 are mostly enriched in volcanogenic material and are predominant in the central part of the basin (Sites 836-839).
The minor element composition records the effects of the hydrothermal activity on the sediments. In the northern area of the basin (Sites 834-835), sedimentation is characterized by higher accumulation rates of the carbonate and hydrothermal fractions. These sediments are probably reworked predominantly, transported in the water column, and then settled locally. Thus, ponded sediments are probably responsible to this high accumulation rates. Diagenetic processes altered the volcanic material to a grade corresponding to the stability of phillipsite. In the central area of the basin (Sites 836-839), sedimentation is characterized by the action of bottom currents preferentially reworking the carbonate and hydrothermal fractions. Volcanogenic accumulation rates are greater at these sites than in the northern Lau Basin. Alteration of volcanic material is more important deeper in the holes and records authigenesis of clay rich in Fe-Mg, most likely smectite. Locally, clay minerals have apparently incorporated Cr and other ore-forming elements.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -19.558656 * Median Longitude: -177.150567 * South-bound Latitude: -20.827000 * West-bound Longitude: -177.862000 * North-bound Latitude: -18.501000 * East-bound Longitude: -176.500000
Date/Time Start: 1990-12-21T20:35:00 * Date/Time End: 1991-01-17T16:00:00
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. Blanc, G (1994): (Table 1) Major element composition of bulk sediment of ODP Leg 135 holes. https://doi.org/10.1594/PANGAEA.803130
  2. Blanc, G (1994): (Table 2) Minor element composition of bulk sediment of ODP Leg 135 holes. https://doi.org/10.1594/PANGAEA.803131
  3. Blanc, G (1994): (Table 4) Accumulation rates of manganese and ore-forming elements and sedimentation rates in ODP Leg 135 holes. https://doi.org/10.1594/PANGAEA.803134