Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Bloch, Salman (1981): Chemical composition of basal metalliferous sediments from DSDP Leg 9 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.705173, Supplement to: Bloch, S (1981): Antipathetic magnesium-manganese relationship in basal metalliferous sediments. Chemical Geology, 33(1-2), 101-113, https://doi.org/10.1016/0009-2541(81)90088-7

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
Basal metalliferous sediments from sites 77B, 80 and 81 of the Deep Sea Drilling Project represent mixtures of pelagic clay, biogenic ooze, and a metalliferous component of hydrothermal origin. The metalliferous end-member of the sediments displays a strong inverse relationship (r = -0.88) between Mg and Mn. Mg is most likely tied up in an X-ray amorphous Mg-silicate ("sepiolite"), whereas Mn occurs almost exclusively in an oxide phase. Precipitation of the Mg-rich phase is favored by high flow rates and limited mixing of the hydrothermal end-member (source of silica) with seawater (source of Mg). Under those conditions much of the hydrothermal Mn(2+), with its slow oxidation kinetics, may escape to the free water column. In contrast, in highly-diluted hydrothermal fluids, which provide a source solution for Mn-rich sediments, dissolved silica is diluted below saturation with respect to "sepiolite". The separation of the Mn and Mg phases may be further compounded by hydraulic fractionation.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 0.320400 * Median Longitude: -122.863667 * South-bound Latitude: -0.962000 * West-bound Longitude: -133.228300 * North-bound Latitude: 1.441500 * East-bound Longitude: -113.809000
Date/Time Start: 1969-12-15T00:00:00 * Date/Time End: 1970-01-08T00:00:00
Event(s):
9-77B * Latitude: 0.481700 * Longitude: -133.228300 * Date/Time: 1969-12-15T00:00:00 * Elevation: -4291.0 m * Penetration: 481.2 m * Recovery: 434.5 m * Location: North Pacific/HILL * Campaign: Leg9 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 463 m cored; 3.1 m drilled; 93.9 % recovery
9-80 * Latitude: -0.962000 * Longitude: -121.553700 * Date/Time: 1970-01-04T00:00:00 * Elevation: -4411.0 m * Penetration: 199.7 m * Recovery: 39.5 m * Location: South Pacific/VALLEY * Campaign: Leg9 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 44 m cored; 0 m drilled; 89.9 % recovery
9-81 * Latitude: 1.441500 * Longitude: -113.809000 * Date/Time: 1970-01-08T00:00:00 * Elevation: -3865.0 m * Penetration: 409.3 m * Recovery: 38.4 m * Location: North Pacific/HILL * Campaign: Leg9 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 39.7 m cored; 0 m drilled; 96.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Bloch, S (1981): (Tables 1-2) Chemical composition of basal metalliferous sediments at DSDP Site 9-77B. https://doi.org/10.1594/PANGAEA.705168
  2. Bloch, S (1981): (Tables 1-2) Chemical composition of basal metalliferous sediments at DSDP Site 9-80. https://doi.org/10.1594/PANGAEA.705169
  3. Bloch, S (1981): (Tables 1-2) Chemical composition of basal metalliferous sediments at DSDP Site 9-81. https://doi.org/10.1594/PANGAEA.705171