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McKenzie, Judith A; Isern, Alexandra R; Karpoff, Anne Marie; Swart, Peter K (1990): Basal dolomitic sediments ofthe Tyrrhenian Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.745808, Supplement to: McKenzie, JA et al. (1990): Basal dolomitic sediments, Tyrrhenian Sea, Ocean Drilling Program Leg 107. In: Kastens, KA; Mascle, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 107, 141-152, https://doi.org/10.2973/odp.proc.sr.107.124.1990

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Published: 1990 (exact date unknown) • DOI registered: 2010-10-29

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Abstract:
Basal dolomitic sediments were recovered at three drill sites in the Tyrrhenian Sea during Ocean Drilling Program (ODP) Leg 107 (Sites 650, 651, and 655). These sediments overlie the basaltic basement complex and are enriched in iron, and in some instances, also in manganese. The manganese enrichments, together with a very slight enrichment in trace transition elements, strongly suggest that the basal sediments have an affinity to deep-sea metalliferous deposits of hydrothermal origin. At Sites 651 and 655, the dolostones contain variable amounts of authigenic palygorskite, a Mgrich clay mineral. At Site 651, the basal sediments are 40 m thick and contain nonstoichiometric dolomite, sometimes Ca rich, but primarily Mg rich. The occurrence of Mg-rich dolomite with excess Mg up to 4% is unusual for the deep-sea environment; it may be associated with a hydrothermally driven flux of altered sea water through the directly underlying basement complex, which comprises basalt, dolerite, and serpentinized peridotite. Low-temperature alteration of the basement complex could produce solutions enriched in Mg. Oxygen-isotope equilibrium temperatures indicate that all of the studied dolomites formed under low-temperature conditions (i.e., < 70 infinity C). The carbon-isotope compositions, together with the strong isotopic covariance, suggest that the Mg-rich dolomite precipitated more rapidly than the Carich dolomite.
We suggest that the low-temperature, hydrothermal convection of Mg-rich solutions through the basal sediments in this back-arc basin environment (1) overcame kinetic problems related to the formation of massive dolostones, and (2) provided a mass-transport mechanism for dolomitization.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 39.910291 * Median Longitude: 13.021909 * South-bound Latitude: 39.356700 * West-bound Longitude: 12.465300 * North-bound Latitude: 40.172200 * East-bound Longitude: 13.900800
Date/Time Start: 1986-01-02T22:38:00 * Date/Time End: 1986-02-10T16:15:00
Event(s):
107-650A * Latitude: 39.356700 * Longitude: 13.900800 * Date/Time Start: 1986-01-02T22:38:00 * Date/Time End: 1986-01-09T14:30:00 * Elevation: -3516.3 m * Penetration: 633.8 m * Recovery: 311.13 m * Location: Tirreno Sea * Campaign: Leg107 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 69 cores; 633.8 m cored; 0 m drilled; 49.1 % recovery
107-651A * Latitude: 40.150500 * Longitude: 12.756500 * Date/Time Start: 1986-01-11T05:22:00 * Date/Time End: 1986-01-17T23:00:00 * Elevation: -3578.0 m * Penetration: 550.9 m * Recovery: 185.66 m * Location: Tirreno Sea * Campaign: Leg107 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 58 cores; 550.9 m cored; 0 m drilled; 33.7 % recovery
107-655A * Latitude: 40.172200 * Longitude: 12.465300 * Date/Time Start: 1986-02-08T23:40:00 * Date/Time End: 1986-02-10T16:15:00 * Elevation: -3290.0 m * Penetration: 90.4 m * Recovery: 77.38 m * Location: Tirreno Sea * Campaign: Leg107 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 89.8 m cored; 0 m drilled; 86.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. McKenzie, JA; Isern, AR; Karpoff, AM et al. (1990): (Table 6) Stable oxygen isotope data for pore waters of ODP Hole 107-651A. https://doi.org/10.1594/PANGAEA.745806
  2. McKenzie, JA; Isern, AR; Karpoff, AM et al. (1990): (Table 2) Major cation composition of ODP Hole 107-651A dolomites. https://doi.org/10.1594/PANGAEA.745802
  3. McKenzie, JA; Isern, AR; Karpoff, AM et al. (1990): (Table 1) Carbonate and Mg content in dolomites of ODP Leg 107 holes. https://doi.org/10.1594/PANGAEA.745801
  4. McKenzie, JA; Isern, AR; Karpoff, AM et al. (1990): (Table 3) Major element composition of bulk samples of dolostones from ODP Leg 107 holes. https://doi.org/10.1594/PANGAEA.745803
  5. McKenzie, JA; Isern, AR; Karpoff, AM et al. (1990): (Table 4) Trace element composition of bulk samples of dolostones from ODP Leg 107 holes. https://doi.org/10.1594/PANGAEA.745804
  6. McKenzie, JA; Isern, AR; Karpoff, AM et al. (1990): (Table 5) Stable carbon and oxygen isotope data for cabonates of ODP Leg 107 holes. https://doi.org/10.1594/PANGAEA.745805