Citation:

0012-821X(76)90152-7

Name: Mineralogy and oxygen isotope values of silicified claystone and porcelanite from DSDP Hole 35-323
Published: 1976
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Discrepancies between predicted and observed interstitial water profiles for sites 322 and 323, Leg 35, Bellingshausen Abyssal Plain, were used to identify sites of reaction for further mineralogical and chemical investigations. Two major reaction sites were identified at site 323:

(1) In the silicification zone between 410 and 505 m depth, where dissolution of biogenic (opaline) silica, plagioclase and a few coccoliths and the formation of opal-CT, Mg-rich smectite and K-feldspar are responsible for the observed silica, Ca[2+], Mg[2+], and K[+] interstitial water gradients. Dissolution of biogenic silica provided most of the silica for the porcelanites.

(2) In the basalt, weathering of pyroxene and plagioclase and the formation of celadonite, smectite, calcite, and goethite are probably responsible for the observed Ca[2+], Mg[2+], and K[+] interstitial water gradients below the silicification zone.

The chemistry of authigenic smectites reflects the composition of their precursor(s).

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Latitude: -63.680700 * Longitude: -97.994800

Date/Time Start: 1974-03-07T00:00:00 * Date/Time End: 1974-03-07T00:00:00

Minimum DEPTH, sediment/rock: 458.1 m * Maximum DEPTH, sediment/rock: 464.4 m

Event(s):

35-323 * Latitude: -63.680700 * Longitude: -97.994800 * Date/Time: 1974-03-07T00:00:00 * Elevation: -5004.0 m * Penetration: 731 m * Recovery: 75.7 m * Location: Antarctic Ocean/PLAIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 21 cores; 199.5 m cored; 0 m drilled; 38 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	DEPTH, sediment/rock	Depth sed	m		Geocode
2	Size fraction < 0.002 mm, clay	<2 µm	%	Kastner, Miriam
3	δ18O, water	δ18O H2O	‰ SMOW	Kastner, Miriam
4	Smectite	Sme	%	Kastner, Miriam	Smectite in mixed layered smectite/illite, 17 A, <2 µm
5	Smectite	Sme	%	Kastner, Miriam	<2 µm
6	Smectite	Sme	%	Kastner, Miriam	>2 µm
7	Illite	Ill	%	Kastner, Miriam	<2 µm
8	Illite	Ill	%	Kastner, Miriam	>2 µm
9	Quartz	Qz	%	Kastner, Miriam	<2 µm, Quartz 3.34 A
10	Quartz	Qz	%	Kastner, Miriam	>2 µm, Quartz 3.34 A
11	Plagioclase	Pl	%	Kastner, Miriam	<2 µm, plagioclase 3.16-3.21 A
12	Plagioclase	Pl	%	Kastner, Miriam	>2 µm, plagioclase 3.16-3.21 A

License:

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

Size:

86 data points

Data

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

1 Depth sed [m]	2 <2 µm [%]	3 δ18O H2O [‰ SMOW]	4 Sme [%] (Smectite in mixed layered sme...)	5 Sme [%] (<2 µm)	6 Sme [%] (>2 µm)	7 Ill [%] (<2 µm)	8 Ill [%] (>2 µm)	9 Qz [%] (<2 µm, Quartz 3.34 A)	10 Qz [%] (>2 µm, Quartz 3.34 A)	11 Pl [%] (<2 µm, plagioclase 3.16-3.21 A)	12 Pl [%] (>2 µm, plagioclase 3.16-3.21 A)
458.1	58	15.0	75	85	36	15	64	63	27	37	73
459.0	68	14.7	75	85	38	15	62	81	28	19	72
459.9	68	14.7	75	84	49	16	51	70	22	30	78
460.8	69	14.3	70	82	43	18	57	71	31	29	69
461.7	65	15.3	70	81	47	19	53	65	31	35	69
462.6	43	19.6	65	78	66	22	34	100	43	0	57
463.5	26	23.2	65	67	52	33	48	100	38	0	62
464.4	9	24.8	50	63		37		100	98	0	20