Citation:

0016-7037(75)90117-9

Name: (Table 1) Mineralogy of basal sediments from DSDP Hole 25-245
Published: 1975
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Deep Sea Drilling Hole 245 (31°32'S, 52°18'E) in the southwest Indian Ocean shows pronounced linear concentration-depth gradients in interstitial dissolved Ca, Mg and Sr. Electrical conductivity tests enable us to make the estimate of a constant diffusion coefficient with depth of about 0.000002 cm**2/sec. The shapes of the concentration-depth gradients suggest that the major reaction sites in this hole are situated in the basal sediments and/or underlying basalts. It is proposed that observed interstitial water concentration changes in Ca and Mg are related to alteration of basaltic material, whereas those in Sr are due to calcium carbonate recrystallization processes. Support for the basaltic material alteration hypothesis comes from petrochemical and mineralogical data. Geochemical data also indicate that the high contents in Fe and Mn of the basal sediments can be related to low temperature alteration of basaltic glass and not necessarily to 'hydrothermal' activity.

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Latitude: -31.533700 * Longitude: 52.301800

Date/Time Start: 1972-08-03T00:00:00 * Date/Time End: 1972-08-03T00:00:00

Minimum DEPTH, sediment/rock: 356.2 m * Maximum DEPTH, sediment/rock: 381.8 m

Event(s):

25-245 * Latitude: -31.533700 * Longitude: 52.301800 * Date/Time: 1972-08-03T00:00:00 * Elevation: -4857.0 m * Penetration: 396.5 m * Recovery: 82 m * Location: Indian Ocean//BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 144.5 m cored; 6 m drilled; 56.7 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	DEPTH, sediment/rock	Depth sed	m		Geocode
2	Calcium carbonate	CaCO3	%	Gieskes, Joris M
3	Montmorillonite	Mnt		Gieskes, Joris M
4	Mica	Mica		Gieskes, Joris M
5	Quartz	Qz		Gieskes, Joris M
6	Feldspar	Fsp		Gieskes, Joris M
7	Clinoptilolite	Cpt		Gieskes, Joris M
8	Volcanic glass	Volc glass		Gieskes, Joris M	shards
9	Comment	Comment		Gieskes, Joris M

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

167 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Depth sed [m]	2 CaCO3 [%]	3 Mnt	4 Mica	5 Qz	6 Fsp	7 Cpt	8 Volc glass	9 Comment
356.2	75	present		present	trace	trace
357.5	70	present	trace	present		present
358.5	75	abundant		trace	trace	abundant
360.2	48	present	trace	present	trace	present
361.6	74	trace	present			present
362.8	71	present	trace	present	trace	present
364.1	63	trace	trace	abundant	trace	present	trace
365.6	70	trace		abundant	trace	present	present
366.5	4	abundant		trace	present	trace	trace	Glass shards are much smaller
367.2	5	abundant		trace	present	trace	trace	Glass shards are much smaller
367.5	71	trace	trace	present	trace	present	trace
368.0	54	trace	trace	present	trace		present
369.1	69		trace	present	trace		present
369.5	65	present	trace		trace		present
370.0	65	present		present	present		present
370.3	29	abundant		present	present		trace	Glass shards are much smaller
370.5	66	abundant		present	trace		present
370.9	36							Mn nodule with extensive Fe coating
371.0	65	abundant	trace	present	trace		trace
371.4	64	abundant	trace	present	trace		trace
371.8	68	present	trace	present	trace		present
372.5	56	present	trace	present	trace		present	From this sample downward, more Fe coating
375.5	52	abundant	trace	present	trace		present
380.1	56	present	trace	present	trace		present
380.6	47	abundant	trace	present	trace		trace
380.6	41	present	trace	present	trace		present
380.8	49	present			trace		present
381.3	53	abundant		present	trace		trace
381.4	37	abundant			present		trace
381.8	71	abundant		present	present	trace	trace