Seyfried, W E; Shanks, Wayne C; Dibble, W E (1978): Chemical and isotopical analsyes of DSDP Hole 34-321 basalts [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.714253, Supplement to: Seyfried, WE et al. (1978): Clay mineral formation in DSDP Leg 34 basalt. Earth and Planetary Science Letters, 41(3), 265-276, https://doi.org/10.1016/0012-821X(78)90183-8
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Abstract:
A blue-green smectite (iron-rich saponite) and green mica (celadonite) are the dominant sheet silicates in veins within the 10.5 m of basalt cored during DSDP Leg 34, Site 32l, in the Nazca plate. Oxygen isotopic analyses of these clays, and associated calcite, indicate a formation temperature of <25°C.
Celadonite contains appreciable Fe2O3, K2O and SiO2, intermediate MgO, and very little Al2O3. Celadonite is commonly associated with goethite and hematite, which suggests that this phase formed by precipitation within a dominantly oxygenated environment of components leached from basalt and provided by seawater. A mass balance estimate indicates that celadonite formation can remove no more than 15% of the K annually transported to the oceans by rivers. In contrast, iron-rich saponite containing significant Al2O3 appears to have precipitated from a nonoxidizing, distinctly alkaline fluid containing a high Na/K ratio relative to unmodified seawater.
Seawater-basalt interaction at low temperatures, resulting in the formation of celadonite and smectite may explain chemical gradients observed in interstitial waters of sediments overlying basalts.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: -12.021500 * Longitude: -81.904000
Date/Time Start: 1974-01-29T00:00:00 * Date/Time End: 1974-01-29T00:00:00
Event(s):
34-321 * Latitude: -12.021500 * Longitude: -81.904000 * Date/Time: 1974-01-29T00:00:00 * Elevation: -4817.0 m * Penetration: 134.5 m * Recovery: 83.5 m * Location: South Pacific/BASIN * Campaign: Leg34 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 123.5 m cored; 0 m drilled; 67.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Seyfried, WE; Shanks, WC; Dibble, WE (1978): (Table 2) Isotopical analyses of selected alteration products from DSDP Hole 34-321. https://doi.org/10.1594/PANGAEA.713939
- Seyfried, WE; Shanks, WC; Dibble, WE (1978): (Table 1) Chemical analyses of smectite and mica from DSDP Hole 34-321. https://doi.org/10.1594/PANGAEA.713937