Enos, Paul; Freeman, Tom (1979): (Table 2) Porosity and permeability of limestones from DSDP Hole 44-392A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.711717, Supplement to: Enos, P; Freeman, T (1979): Lower Cretaceous peritidal limestones at 2,700-m depth, Blake nose, Atlantic Ocean. Geology, 7(2), 83-87, https://doi.org/10.1130/0091-7613(1979)7%3C83:LCPLAM%3E2.0.CO;2
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Abstract:
At sites 390 and 392 (Deep Sea Drilling Project, Leg 44) on the Blake nose, thoroughly lithified Lower Cretaceous limestone more than 250 m thick is abruptly overlain by a condensed sequence of Barremian to Eocene pelagic carbonate ooze. The Lower Cretaceous sediments consist of three units: limestone with moldic porosity (base), oolitic limestone, and fenestral limestone. Subaerial diagenesis of the limestone section is recorded by (1) caverns with vertical dimensions of up to 10 m, (2) stalactitic intergranular cement, and (3) meniscus sediment (or cement). Compatible with these subaerial features are mud cracks, fenestral fabrics, intraclasts, and cryptalgal structures.
Inasmuch as these shallow-water and tidal-flat deposits are now beneath 2,607 m of sea water (plus 99 m of younger sediments), they serve to dramatize the apparent degree of Barremian and later subsidence of this part of the Atlantic outer continental shelf.
Porosity and permeability are high in vuggy samples, which are common in the skelmoldic limestone. Cementation has destroyed most of the extensive primary porosity of the two younger units.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 29.910500 * Longitude: -76.178000
Date/Time Start: 1975-09-23T00:00:00 * Date/Time End: 1975-09-23T00:00:00
Minimum DEPTH, sediment/rock: 99.7 m * Maximum DEPTH, sediment/rock: 326.1 m
Event(s):
44-392A * Latitude: 29.910500 * Longitude: -76.178000 * Date/Time: 1975-09-23T00:00:00 * Elevation: -2601.0 m * Penetration: 349 m * Recovery: 25.9 m * Location: North Atlantic * Campaign: Leg44 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 31 cores; 269.3 m cored; 13.5 m drilled; 9.6 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Sample code/label | Sample label | Enos, Paul | DSDP/ODP/IODP sample designation | ||
| 3 | Lithologic unit/sequence | Unit | Enos, Paul | |||
| 4 | Lithology/composition/facies | Lithology | Enos, Paul | |||
| 5 | Porosity | Poros | % vol | Enos, Paul | ||
| 6 | Permeability (earth science) | k | 10-12 m2 | Enos, Paul | ||
| 7 | Type | Type | Enos, Paul | of porosity, principal | ||
| 8 | Type | Type | Enos, Paul | of porosity, minor |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
82 data points
Data
| 1 Depth sed [m] | 2 Sample label | 3 Unit | 4 Lithology | 5 Poros [% vol] | 6 k [10-12 m2] | 7 Type (of porosity, principal) | 8 Type (of porosity, minor) |
|---|---|---|---|---|---|---|---|
| 99.7 | 44-392A-5-2,22-25 | Fenestral | Skeletal fragment wackestone | 9.1 | 0.000010 | Moldic cr Se-mcMO | Fenestral cfPd lms FE* |
| 100.7 | 44-392A-5-2,120-125 | Fenestral | Pelletoidal packstone | 14.6 | 1.885023 | Vug sx Se-lmsVUG | Moldic sx Se-sms MO |
| 140.9 | 44-392A-10-2,33-38 | Fenestral | Pelletoidal intraclastic packstone | 3.3 | 0.000010 | Fenestral cr Pd-sms FE | Moldic sx Se-mc MO |
| 141.3 | 44-392A-10-2,80-85 | Fenestral | Skeletal pellotoidal packstone with wackestone lenses | 1.5 | 0.000010 | Fenestral cr Pd-mc FE | (was large mesopore) |
| 184.5 | 44-392A-16-1,99-102 | Fenestral | Fenestral wackestone | 1.9 | 0.000010 | Fenestral cr Pd-mc FE | (was large mesopore) |
| 231.1 | 44-392A-21-1,110-113 | Oolitic | Skeletal intraclastic oolitic grainstone, coarse | 1.5 | 0.000039 | Shelter ir,cr Pd-lms SH | Interparticle ir,cf Pd-sms BP (was 30%) cf moldic, intraparticle |
| 251.3 | 44-392A-23-1,125-128 | Skelmoldic | Intraclastic skeletal grainstone | 3.1 | 0.000020 | Interparticle cr Pd-lms BP (was 35%) | Moldic sx Se-sms MO |
| 251.5 | 44-392A-23-1,148-150 | Skelmoldic | Skeletal pelletoidal packstone | 18.8 | 2.812731 | Vug sx Se-lms/smg VUG | Interparticle sx Pd-sms BP moldic sx Se-sms MO intraparticle cr Pp-sms WP |
| 269.0 | 44-392A-25CC | Skelmoldic | Skeletal pelletoidal packstone | 1.8 | 0.000039 | Vug sx Se-lms VUG | Moldic sx Se-sms MO interparticle cfPd-sms BP (was 20%) |
| 297.6 | 44-392A-28CC, A | Skelmoldic | Recrystallized skeletal wackestone | 10.8 | Vug sx Se-lms/smg VUG | Moldic sx Se-sms/lms MO | |
| 297.7 | 44-392A-28CC, B | Skelmoldic | Recrystallized packstone or grainstone | 19.5 | 0.113496 | Moldic sx Se-sms MO | Vug sx Se-lms VUG |
| 326.1 | 44-392A-31CC | Skelmoldic | Fenestral mudstone | 0.8 | 0.000010 | Fenestral cr Pd-lms FE (was 10%) |