Citation:

dsdp.proc.64.154.1982

Name: (Table 3) Mineral zones in sediments at DSDP Hole 64-478
Creator: Miriam Kastner
Published: 1982
License: https://creativecommons.org/licenses/by/3.0/

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Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Latitude: 27.096800 * Longitude: -111.507500

Date/Time Start: 1978-12-24T00:00:00 * Date/Time End: 1978-12-24T00:00:00

Minimum DEPTH, sediment/rock: 92.50 m * Maximum DEPTH, sediment/rock: 401.50 m

Event(s):

64-478 * Latitude: 27.096800 * Longitude: -111.507500 * Date/Time: 1978-12-24T00:00:00 * Elevation: -1889.0 m * Penetration: 464 m * Recovery: 297.6 m * Location: North Pacific/Gulf of California/CHANNEL * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 49 cores; 427 m cored; 24 m drilled; 69.7 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Depth, top/min	Depth top	m	Kastner, Miriam
2	Depth, bottom/max	Depth bot	m	Kastner, Miriam	Maximums are approximate
3	DEPTH, sediment/rock	Depth sed	m		Geocode – mbsf
4	Description	Description		Kastner, Miriam	#1
5	Description 2 (continued)	Description 2		Kastner, Miriam	#2
6	Description 2 (continued)	Description 2		Kastner, Miriam	#3
7	Description 2 (continued)	Description 2		Kastner, Miriam	#4

License:

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

Size:

54 data points

Data

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

1 Depth top [m]	2 Depth bot [m] (Maximums are approximate)	3 Depth sed [m] (mbsf)	4 Description (#1)	5 Description 2 (#2)	6 Description 2 (#3)	7 Description 2 (#4)
0.0	185.0	92.50	Primarily a mixture of the detrital minerals quartz, plagioclase, some alkali feldspars and the clay minerals mixed-layer smectite/illite, illite, and chlorite/kaolinite, with the biogenic minerals opal-A and calcite.	Also very small amounts of the diagenetic minerals pyrite, clinoptilolite (first appearance at about 2.5 m depth), and protodolomite (first appearance at about 125 m depth).
185.0	215.0	200.00	Thermally altered zone at upper contact with first sill complex. Average detrital quartz and Plagioclase same as in above zone.	The amount of detrital clay minerals decreases drastically toward the sill; in the last 4 to 5 meters, there are only traces of clay minerals. Although opal-A shows a similar trend, the amount of quartz does not increase significantly with depth.	Clinoptilolite becomes abundant close to contact with the sill and dolomite is a major phase from about 138m to the contact; dolomite and calcite do not coexist. Gypsum and pyrite are present throughout this zone.
215.0	240.0	227.50	First sill complex.
240.0	247.0	243.50	Thermally altered zone at lower contact with first sill complex. No significant changes in detrital quartz and Plagioclase. Detrital clay minerals and opal-A are somewhat more abundant at this contact than at upper contact.	Some smectite formed, most probably during the thermal event. Calcite occurs throughout this zone; only some protodolomite and calcite at -246 meters. Clinoptilolite, gypsum, and pyrite are present as well.
247.0	250.0	248.50	A thin zone with a similar mixture of the detrital, biogenic, and diagenetic minerals as in the uppermost zone between 0 and 185 meters.
250.0	253.0	251.50	Thermally altered zone at upper contact with second rather thin sill complex. No change in average detrital quartz and Plagioclase. The origin of some alkali feldspar is unclearis it detrital or hydrothermal? Clay minerals consist of	very small amounts of detrital illite, but mainly newly formed, well-crystallized smectite. The amount of opal-A decreases rapidly; at 252.5 meters only traces of opal-A are present and the major silica mineral is opal-CT.	At about 253 meters opal-A is not present. Opal-CT is the dominant silica mineral. Its abundance decreases significantly at 253 meters and quartz becomes the dominant silica mineral. At lease 50% of the quartz present is newly formed.	Calcite is present throughout except at the immediate contact with the sill (no dolomite). Clinoptilolite is absent from 252.5m to contact with sill and the appearance of analcime. Pyrite is abundant throughout the zone and some gypsum is present
253.0	256.5	254.75	Second, thin, sill complex
256.5	259.0	257.75	Thermally altered zone at lower contact with second sill complex. No change in average detrital quartz and Plagioclase. Small amounts of detrital clay minerals. Only traces of opal-A but much opal-CT.	Except for the immediate contact with the sill calcite is present throughout, possibly also some dolomite or protodolomite. There is much clinoptilolite at the contact. Pyrite is rather abundant; only traces of gypsum.
259.0	290.0	274.50	Return to a similar mixture of the detrital, biogenic, and diagenetic minerals described in the zone between 0 to 185 meters. On the average, however, less opal-A.
290.0	339.0	314.50	290 to 339 Thermally altered zone at upper contact with a very thick sill complex. There are three subzones:
290.0	325.0	307.50	The distal band of the thermally altered zone. No change in average detrital quartz, Plagioclase, and clay minerals.	Opal-A, however, is present only in trace amounts. The abundance of protodolomite increases; it coexists with calcite, except that at about 303 meters there is a dolostone layer. Clinoptilolite is absent. Some pyrite and gypsum throughout the zone.
325.0	337.0	331.00	The intermediate band. Not much change in the detrital quartz and Plagioclase, and only very small amounts of detrital clay minerals.	Opal-A is no longer present; instead, opal-CT is as abundant as quartz. Calcite is present throughout, but there is no dolomite or clinoptilolite. Some pyrite and gypsum throughout.
337.0	339.0	338.00	The immediate upper contact with the thick sill complex. Mainly quartza mixture of detrital and newly formedand less Plagioclase.	No opal-A, opal-CT, or clinoptilolite. Well-crystallized, newly formed smectite and recrystallized illite between 338 and 338.8 meters; below, only much well-crystallized smectite.	Calcite is present, but only until the last 0.5 to 0.75 meters from the contact with the sill. Dolomite and clinoptilolite are absent. Pyrite is abundant between 337 and 338 meters and less so below. Gypsum is present throughout.
339.0	464.0	401.50	Thick sill complex