Citation:

odp.proc.sr.111.136.1989

Name: Petrologic description and values of resistivity, CEC, and porosity of samples from ODP Hole 111-504B (Table 1)
Published: 1989
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The resistivity, porosity, and cation exchange capacity of 36 basaltic samples recovered in Hole 504B during four DSDP and ODP legs have been measured in the laboratory at room temperature and atmospheric pressure. The presence of chlorites and particularly smectites as alteration products of basalt phases is reflected by high values of cation exchange capacity (CEC). Whereas the massive units of Layers 2A and 2B are defined by high and uniform CEC values, the more fractured and altered pillows are characterized in the entire hole by even higher values of CEC and a large variability. The lowest CEC values, measured for the massive units of Layer 2C, are due to changes of basalt alteration fades with depth and the related decreasing abundance of smectites with increasing depth in the oceanic crust.

The porosity and the apparent formation factor (computed from resistivity measurements made with a fluid salinity similar to that of seawater) are related by an inverse power law similar to Archie's formula, with m close to 1.0 and a as large as 9.1. A review of the literature shows that such a low m value equates to current conduction in cracks and microcracks present throughout the rock. The presence of these microstructures reflects the extensional regime under which the rock formed at the ridge axis, and they were conserved by precipitation of clay minerals attributable to intense hydrothermal circulation. The comparison of these results to similar studies of mid-ocean ridge basalt physical properties indicates that m tends to increase to values close to 2.0 with age. Such values are, in fact, similar to those found for sedimentary rocks and probably reflect an increased tortuosity of the conducting pore space with increasing age. An inverse relationship also relates CEC and apparent formation factor, indicating that surface conduction of clay minerals plays an important role during downhole electrical experiments. This provides a plausible key to the paradox of low permeability and high apparent porosity obtained from comparing the in-situ experiments conducted in Hole 504B.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 1.226900 * Longitude: -83.730300

Date/Time Start: 1986-10-05T11:45:00 * Date/Time End: 1986-10-16T18:15:00

Minimum DEPTH, sediment/rock: 308.0 m * Maximum DEPTH, sediment/rock: 1341.0 m

Event(s):

111-504B * Latitude: 1.226900 * Longitude: -83.730300 * Date/Time Start: 1986-10-05T11:45:00 * Date/Time End: 1986-10-16T18:15:00 * Elevation: -3474.0 m * Penetration: 1562.1 m * Recovery: 27.36 m * Location: North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 209 m cored; 0 m drilled; 13.1 % recovery

Comment:

susceptibility peak BO depth 206,0 questionable

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Lithologic unit/sequence	Unit		Pezard, Philippe A
2	Sample comment	Sample comment		Pezard, Philippe A
3	Description	Description		Pezard, Philippe A
4	Alteration	Alteration		Pezard, Philippe A
5	Lithology/composition/facies	Lithology		Pezard, Philippe A
6	DEPTH, sediment/rock	Depth sed	m		Geocode
7	Resistivity, electrical	Resist electr	Ohm m	Pezard, Philippe A
8	Calcium ion exchange capacity	Ca ex-cap	meq	Pezard, Philippe A
9	Porosity, fractional	Poros frac		Pezard, Philippe A

License:

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

Size:

455 data points

Data

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

1 Unit	2 Sample comment	3 Description	4 Alteration	5 Lithology	6 Depth sed [m]	7 Resist electr [Ohm m]	8 Ca ex-cap [meq]	9 Poros frac
2C	451	Many fractures	Phillipsite, celadonite	Pillow	308.0	58.6	112	0.030
2C	466	Many fractures	Smectite (saponite), aragonite	Pillow	309.0		152
2D	514	Few cracks	Smectite (saponite), red halos	Massive flow	315.0	111.1	102	0.022
2D	527	No fractures	Smectite (saponite), red halos	Massive flow	317.0	129.5	51	0.018
2D	533	No fractures	Smectite (saponite), red halos	Massive flow	318.5		65
2D	563	No fractures	Smectite (saponite), red halos	Massive flow	321.5	125.2	44	0.011
3A	577	One fracture	Smectite, red halos, mixed layers	Pillow	327.0	76.8	94	0.034
3A	768	No fractures	Smectite, red halos, mixed layers	Pillow	361.5		56
3A	791	One fracture	Smectite, red halos, mixed layers	Pillow	362.5		143
3A	801	One fracture	Smectite, red halos, mixed layers	Pillow	366.0	63.5	70	0.021
9	1180	Breccia	Intense smectite alteration, red halos	Breccia	423.5		395
9	1183	No fractures	Intense smectite alteration, red halos	Massive unit	424.0	32.8	133	0.037
9	1192	A small crack	Intense smectite alteration, red halos	Massive unit	425.0	50.9	90	0.034
10	1210	A small crack	Intense smectite alteration, red halos	Massive unit	427.0	98.9	93	0.022
10	1213	No fractures	Intense smectite alteration, red halos	Massive unit	427.5	132.0	101	0.019
14	1254	No fractures	Smectite (saponite), red halos	Massive unit	432.5		63
16	1365	Small cracks	Smectite (saponite), red halos	Pillow	444.0	170.8	83	0.015
24	300	One fracture	Smectite (saponite), Na zeolite	Massive flow	543.0		64	0.025
24	315	A small crack	Smectite (saponite), Na zeolite	Massive flow	545.0	79.2	61	0.025
24	324	No fractures	Smectite (saponite), Na zeolite	Massive flow	547.0		140
25	342	Few fractures	Smectite, Na zeolites, red halos, calcite	Pillows	550.0		75
25	359	Cracks	Smectite, Na zeolites, red halos, calcite	Pillows	552.0		71
25	383	Cracks	Smectite, Na zeolites, red halos, calcite	Pillows	554.0		130
25	392	Few fractures	Smectite, Na zeolites, red halos, calcite	Pillows	555.5		61
27	501	No fractures	Na zeolites, smectite (saponite), talc	Massive flow	576.5	210.6		0.013
27	538	No fractures	Minor zeolites, smectite (saponite)	Massive flow	579.5	142.9	71
27	569	A small crack	Minor zeolites, smectite (saponite)	Massive flow	581.5	188.0		0.013
27	575	No fractures	Green smectite (saponite)	Massive flow	582.5	179.9	47	0.011
27	600	No fractures	Green smectite (saponite)	Massive flow	584.5	175.2		0.011
27	622	No fractures	Green smectite (saponite)	Massive flow	586.5	131.1	113	0.014
30C	836	Cracks	Green smectite (saponite)	Thin flow	642.5		67
30C	842	No fractures	Smectite (saponite), pyrite	Thin flow	644.0	124.7	84	0.014
30C	855	A fracture; cracks	Smectite (saponite), pyrite	Thin flow	646.0	77.6	52	0.017
34	985	No fractures	Smectite (saponite), pyrite	Massive flow	668.0	201.2	89	0.012
34	998	One crack	Smectite (saponite), pyrite	Massive flow	669.5	73.1	50	0.019
34	1013	No fractures	Smectite (saponite), pyrite	Massive flow	676.0	103.8	55	0.018
34	1019	Two large cracks	Smectite (saponite), pyrite	Massive flow	678.0	94.8	50
34	1024	Few cracks	Smectite (saponite), talc	Massive flow	680.5	113.8	63	0.015
34	1033	No fractures	Smectite (saponite), talc	Massive flow	681.5		57
34	1041	One fracture	Smectite (saponite), talc	Massive flow	683.0	136.6	59	0.018
45	1497	Many fractures	Smectite (saponite), quartz	Pillow	878.0	89.5	58	0.028
45	1502	No fractures	Smectite (saponite), quartz	Pillow	787.5		70
49	1564	No fractures	Smectite (saponite), pyrite	Massive unit	828.0		92
50	1AA	Many fractures	Anhydrite, mixed-layer clays	Pillow	845.5		111
51	7C	Many fractures	Anhydrite, mixed-layer clays	Dike	847.0	67.8	78	0.023
51	11B	No fractures	Anhydrite, mixed-layer clays	Dike	849.0	108.5	11	0.016
59	3D	One fracture	Anhydrite, mixed-layer clays	Thin flow/dike	900.0	86.4	23	0.037
59	3F	Breccia	Anhydrite, mixed-layer clays	Breccia	900.5		122
63	1	Breccia	Chlorite, laumontite, pyrite, talc, quartz	Breccia	910.5	19.9	76	0.132
63	1A	Breccia	Chlorite, laumontite, pyrite, talc, quartz	Breccia	911.0	63.6	161	0.042
63	10AA	Breccia	Chlorite, laumontite, pyrite, talc, quartz	Breccia	912.0		22
63	12AA	Breccia	Chlorite, laumontite, pyrite, talc, quartz	Breccia	912.5		62
73	4C	No fractures	Chlorite, laumontite, quartz, pyrite, ...	Massive unit	988.5	85.3	254	0.033
73	6	Two fractures	Chlorite, laumontite, quartz, pyrite, ...	Breccia	992.0	36.6	18	0.102
74	21AA	Many fractures	Chlorite, laumontite, calcite, pyrite, ...	Massive unit	993.0
74	10B	One fracture; many cracks	Chlorite, laumontite, calcite, pyrite, ...	Massive unit	994.5	295.3	96	0.015
74	22A	Breccia	Chlorite, laumontite, calcite, pyrite, ...	Massive unit	995.5		111
90	36AA	One fracture	Chlorite, laumontite, pyrite, mixed-layer clays	Massive unit	1041.0		71
106	42AA	No fractures	Chlorite, laumontite, pyrite, mixed-layer clays	Massive unit	1101.5		52
109	44AA	Cracks	Clorite, laumontite, mixed layer clays, ...	Massive unit	1119.0		30
118	48AA	No fractures	Smectite (saponite), pyrite, talc, ...	Massive unit	1174.0		32
129	60AA	No fractures	Smectite, pyrite, talc, mixed-layer clays, ...	Massive unit	1237.0		39
139	68A	No fractures	Smectite, pyrite, talc, mixed-layer clays, ...	Massive unit	1287.0		23
141	71AA	No fractures	Smectite, quartz, talc, mixed-layer clays, ...	Massive unit	1305.0		17
148	80AA	One fracture	Chlorite, laumontite, anhydrite, talc, ...	Massive unit	1341.0		32