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Yatabe, Autumn; Vanko, David A; Ghazi, Mohamad (2000): Geochemical composition of calcite and aragonite, and characteristics of hydrothermal fluids of ODP Leg 168 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.788893, Supplement to: Yatabe, A et al. (2000): Petrography and chemical compositions of secondary calcite and aragonite in Juan de Fuca Ridge basalts altered at low temperature. In: Fisher, A; Davis, EE; Escutia, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 168, 1-12, https://doi.org/10.2973/odp.proc.sr.168.003.2000

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Abstract:
During Leg 168 a transect was drilled across the eastern flank of the Juan de Fuca Ridge in an area where the volcanic basement is covered by sediments of variable thickness. Samples of basement volcanic rocks were recovered from nine locations along the transect, where the basement sediment interface is presently heated to temperatures varying from 15° to 64°C. Altered rocks with secondary calcium carbonate were common at four of the sites, where present-day temperatures range from 38° to 64°C. Fluid inclusions in aragonite suggest that the mineral precipitated from an aqueous fluid of seawater salinity at temperatures well below 100°C.
The chemical compositions of secondary calcite and aragonite were determined with both an electron microprobe and a laser-ablation inductively coupled plasma-mass spectroscopy (LA-ICP-MS) microprobe. These two techniques yielded consistent analyses of the same minor elements (Mg and Sr) in the same specimens. The combined results show that secondary aragonites contain very little Mg, Mn, Fe, Co, Ni, Cu, Zn, Rb, La, Ce, Pb, or U, yet they contain significant Sr. In contrast, secondary calcites contain significant Mg, Mn, Fe, Ni, Cu, Zn, and Pb, yet very little Co, Rb, Sr, La, Ce, or U. Secondary calcium carbonates provide subseafloor reservoirs for some minor and trace elements. Replacement of aragonite by calcite should result in a release of Sr, Rb, and Zn to solution, and it provides a sink for Mg, Mn, Ni, Cu, Zn, and Pb.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 47.785897 * Median Longitude: -128.010587 * South-bound Latitude: 47.756500 * West-bound Longitude: -128.504000 * North-bound Latitude: 47.858000 * East-bound Longitude: -127.730000
Date/Time Start: 1996-07-01T09:00:00 * Date/Time End: 1996-08-11T11:57:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Yatabe, A; Vanko, DA; Ghazi, M (2000): (Table T2) Major element oxides and carbonate composition of aragonite from ODP Leg 168 sites. https://doi.org/10.1594/PANGAEA.788890
  2. Yatabe, A; Vanko, DA; Ghazi, M (2000): (Table T1) Major element oxides and carbonate composition of calcite from ODP Leg 168 sites. https://doi.org/10.1594/PANGAEA.788889
  3. Yatabe, A; Vanko, DA; Ghazi, M (2000): (Table T3) Element composition of calcite and aragonite from ODP Site 168-1027 and Hole 168-1032A. https://doi.org/10.1594/PANGAEA.788891
  4. Yatabe, A; Vanko, DA; Ghazi, M (2000): (Table T4) Distribution coefficients and element ratios in hydrothermal fluids of ODP Site 168-1027 and Hole 168-1032A. https://doi.org/10.1594/PANGAEA.788892