Lopez, Cynthia M (1982): (Table 1) Core descriptions at DSDP Leg 66 Holes [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.817707, Supplement to: Lopez, CM (1982): Petrography and diagenesis of sands and sandstones, Deep Sea Drilling Project Leg 66. In: Watkins, JS; Casey Moore, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 66, 505-520, https://doi.org/10.2973/dsdp.proc.66.116.1982
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Published: 1982 (exact date unknown) • DOI registered: 2013-09-04
Abstract:
Sands and sandstones from Leg 66 of the Deep Sea Drilling Project can be grouped into three general categories based upon textural and diagenetic similarities. Early Miocene upper slope sandstones from Sites 489 and 493 are cemented either by calcite, or by gypsum. Calcite is volumetrically the most important cement; it occurs as a void-filling cement in foraminifer chambers, as a micritic to sparry pore-filling cement, and as a replacement mineral in framework grains. The gypsum cement has a patchy distribution and appears to have been introduced along fractures in upper slope sands.
Quaternary lower slope sands from Sites 488 and 486 are either weakly consolidated or totally unconsolidated. Framework grains in finer-grained sands are surrounded by thin, discontinuous films of chlorite and illite, which originated largely from the in situ alteration of biotite. Coarser-grained sands have thicker, more continuous clay films that consist of altered detrital biotite and of mechanically dispersed illite and chlorite. Subsequent burial diagenesis could totally obscure these differences in the origin of matrix between the finer- and coarser-grained sands.
Middle to late Miocene slope sands from Site 492 have a complicated diagenetic history. There is a pervasive network of fractures throughout the sands, yet there has been no rotation of grain fragments. Either the sands were fractured tectonically following compaction or they were fractured as a result of compaction subsequent to decementation. Interbedded shales from this site are also intensively fractured, which suggests that the possibility of tectonic fracturing is more likely.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 16.087222 * Median Longitude: -99.018256 * South-bound Latitude: 15.913800 * West-bound Longitude: -99.138000 * North-bound Latitude: 16.381000 * East-bound Longitude: -98.925500
Date/Time Start: 1979-03-22T00:00:00 * Date/Time End: 1979-04-24T00:00:00
Minimum DEPTH, sediment/rock: 9.50 m * Maximum DEPTH, sediment/rock: 621.30 m
Event(s):
66-486 * Latitude: 15.922800 * Longitude: -99.135000 * Date/Time: 1979-03-22T00:00:00 * Elevation: -5142.0 m * Penetration: 38 m * Recovery: 17.5 m * Location: North Pacific/TRENCH * Campaign: Leg66 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 43 m cored; 0 m drilled; 40.7 % recovery
66-486A * Latitude: 15.913800 * Longitude: -99.138000 * Date/Time: 1979-03-22T00:00:00 * Elevation: -5138.0 m * Penetration: 22 m * Recovery: 3.5 m * Location: North Pacific/TRENCH * Campaign: Leg66 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 22 m cored; 0 m drilled; 16 % recovery
66-488 * Latitude: 15.951700 * Longitude: -99.027700 * Date/Time: 1979-03-27T00:00:00 * Elevation: -4254.0 m * Penetration: 428.5 m * Recovery: 159.5 m * Location: North Pacific/CREST * Campaign: Leg66 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 44 cores; 408 m cored; 19 m drilled; 39.1 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | Sample code/label | Sample label | Lopez, Cynthia M | DSDP/ODP/IODP sample designation | ||
| 6 | DEPTH, sediment/rock | Depth sed | m | Geocode – mbsf | ||
| 7 | Comment | Comment | Lopez, Cynthia M | |||
| 8 | Epoch | Epoch | Lopez, Cynthia M | |||
| 9 | Description | Description | Lopez, Cynthia M | |||
| 10 | Description 2 (continued) | Description 2 | Lopez, Cynthia M |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
157 data points
Data
| 1 Event | 2 Latitude | 3 Longitude | 4 Elevation [m] | 5 Sample label | 6 Depth sed [m] | 7 Comment | 8 Epoch | 9 Description | 10 Description 2 |
|---|---|---|---|---|---|---|---|---|---|
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-3-1,5-7 | 9.50 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Muddy sand, olive black, fine- to medium grained, locally coarse-grained, structureless, soupy | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-3-1,99-101 | 10.50 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Muddy sand, olive black, fine- to medium grained, locally coarse-grained, structureless, soupy | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-3-2,50-52 | 11.00 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Muddy sand, olive black, fine- to medium grained, locally coarse-grained, structureless, soupy | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-3-4,64-66 | 14.60 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Muddy sand, olive black, fine- to medium grained, locally coarse-grained, structureless, soupy | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-3-5,0-2 | 16.00 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Muddy sand, olive black, fine- to medium grained, locally coarse-grained, structureless, soupy | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-3-5,98-102 | 17.00 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Muddy sand, olive black, fine- to medium grained, locally coarse-grained, structureless, soupy | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-3-6,50-52 | 18.00 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Muddy sand, olive black, fine- to medium grained, locally coarse-grained, structureless, soupy | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-3-CC,0-2 | 19.00 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Muddy sand, olive black, fine- to medium grained, locally coarse-grained, structureless, soupy | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-5-1,50-52 | 29.00 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Fine to medium micaceous sand, olive gray grading to medium to coarse sand, medium dark gray through sections 1 and 2 | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-5-1,99-107 | 29.50 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Fine to medium micaceous sand, olive gray grading to medium to coarse sand, medium dark gray through sections 1 and 3 | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-5-2,50-52 | 30.50 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Fine to medium micaceous sand, olive gray grading to medium to coarse sand, medium dark gray through sections 1 and 4 | |
| 66-486 | 15.9228 | -99.1350 | -5142 | 66-486-5-2,139-141 | 31.40 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Fine to medium micaceous sand, olive gray grading to medium to coarse sand, medium dark gray through sections 1 and 5 | |
| 66-486A | 15.9138 | -99.1380 | -5138 | 66-486A-3-1,29-31 | 14.80 | Trench about 120 km SE of Acapulco, Mexico | mid-Pleistocene? | Fine to medium muddy sand, olive gray, micaceous | |
| 66-488 | 15.9517 | -99.0277 | -4254 | 66-488-42-3,9-11 | 384.10 | Base of lower slope on crest of first ridge landward of the Middle America Trench | early-mid Quaternary | Muddy silt, grayish olive green with incipient fissility along same orientation as bedding, above and below 5 cm thick graded bed of fine to very fine sand. Occasional sponge remains | |
| 66-488 | 15.9517 | -99.0277 | -4254 | 66-488-45-1,103-105 | 410.50 | Base of lower slope on crest of first ridge landward of the Middle America Trench | early-mid Quaternary | Fine and fine to medium sand, dark greenish gray to medium light gray | |
| 66-488 | 15.9517 | -99.0277 | -4254 | 66-488-46-1,39-41 | 419.40 | Base of lower slope on crest of first ridge landward of the Middle America Trench | early-mid Quaternary | Muddy silt, very firm dark greenish gray. Fine to medium sand, medium light gray, slightly finer grained in top 3 cm and very firm dark greenish gray muddy silt with small blebs and discontinuous stringers of fine to coarse sand | |
| 66-489A | 16.2698 | -99.0188 | -1240 | 66-489A-30-5,82-85 | 288.80 | Upper slope, Middle America Trench, off SW Mexico | early Miocene | Fine to medium-grained sandstone, olive gray (5Y 3/2), carbonate-cemented, with irregular dark, fiber grained zones. Occasional shell fragments. Zeolite filled and unfilled fractures, apparent dips 40°-90° | |
| 66-489A | 16.2698 | -99.0188 | -1240 | 66-489A-30-5,100-103 | 289.00 | Upper slope, Middle America Trench, off SW Mexico | early Miocene | Fine to medium-grained sandstone, olive gray (5Y 3/2), carbonate-cemented, with irregular dark, fiber grained zones. Occasional shell fragments. Zeolite filled and unfilled fractures, apparent dips 40°-90° | |
| 66-489A | 16.2698 | -99.0188 | -1240 | 66-489A-30-5,125-128 | 291.00 | Upper slope, Middle America Trench, off SW Mexico | early Miocene | Fine to medium-grained sandstone, olive gray (5Y 3/2), carbonate-cemented, with irregular dark, fiber grained zones. Occasional shell fragments. Zeolite filled and unfilled fractures, apparent dips 40°-90° | |
| 66-490 | 16.1593 | -99.0565 | -1761 | 66-490-52-1,61-64 | 465.60 | Seaward edge, transition zone between accretionary zone and continental crust | Pliocene? | Loose fine to medium sand, olive gray with subangular clasts of biotite, indurated muddy siltstone, olive gray, set in loose sand | |
| 66-491 | 16.0290 | -98.9722 | -2883 | 66-491-21-3,14-18 | 184.15 | Inner slope, Middle America Trench, about 2.1 km above and about 14.25 km NNE of adjacent trench floor on a steep slope of about 9° | early Pliocene | Muddy silt, grayish olive green, with fine to medium sand. Sand occurs as chaotic, discontinuous beds, and as burrow fillings | |
| 66-491 | 16.0290 | -98.9722 | -2883 | 66-491-43-6,32-33 | 388.35 | Inner slope, Middle America Trench, about 2.1 km above and about 14.25 km NNE of adjacent trench floor on a steep slope of about 9° | early Pliocene | Muddy siltstone, grayish olive green (in places soft to firm silt with fine sand beds). Interval sampled lies just beneath a zone of healed fractures | |
| 66-491 | 16.0290 | -98.9722 | -2883 | 66-491-52-1,99-101 | 467.00 | Inner slope, Middle America Trench, about 2.1 km above and about 14.25 km NNE of adjacent trench floor on a steep slope of about 9° | early Pliocene | Fine to very coarse sand, unconsolidated, dark greenish gray with silt, grayish olive green. Fine to very coarse sand with granules and pebbles up to 5 mm; minor intervals of silt | |
| 66-492A | 16.0788 | -98.9453 | -1935 | 66-492A-4-1,83-85 | 14.55 | late Pliocene to early Quaternary | Glauconitic muddy sand | ||
| 66-492B | 16.0788 | -98.9453 | -1942 | 66-492B-1-1,99-101 | 281.00 | Midslope region | late Miocene | Medium to coarse very clean sand, medium light gray, one graded bed through first 4 sections, small clasts (up to 3 cm) of fractured shaly mudstone with shiny polished fractures | |
| 66-492B | 16.0788 | -98.9453 | -1942 | 66-492B-1-2,145-147 | 283.00 | Midslope region | late Miocene | Medium to coarse very clean sand, medium light gray, one graded bed through first 4 sections, small clasts (up to 3 cm) of fractured shaly mudstone with shiny polished fractures | |
| 66-492B | 16.0788 | -98.9453 | -1942 | 66-492B-1-3,99-101 | 284.00 | Midslope region | late Miocene | Medium to coarse very clean sand, medium light gray, one graded bed through first 4 sections, small clasts (up to 3 cm) of fractured shaly mudstone with shiny polished fractures | |
| 66-492B | 16.0788 | -98.9453 | -1942 | 66-492B-1-4,147-149 | 286.00 | Midslope region | late Miocene | Same as Hole 492B, except interlayered medium to coarse sand and scaly argillite, a well-lithified mudstone with a pervasive fabric of anastomosing polished and lineated fractures surfaces | |
| 66-492B | 16.0788 | -98.9453 | -1942 | 66-492B-1-5,9-11 | 286.10 | Midslope region | late Miocene | Same as Hole 492B, except interlayered medium to coarse sand and scaly argillite, a well-lithified mudstone with a pervasive fabric of anastomosing polished and lineated fractures surfaces | |
| 66-492B | 16.0788 | -98.9453 | -1942 | 66-492B-1-5,59-61 | 286.60 | Midslope region | late Miocene | Same as Hole 492B, except interlayered medium to coarse sand and scaly argillite, a well-lithified mudstone with a pervasive fabric of anastomosing polished and lineated fractures surfaces | |
| 66-493 | 16.3810 | -98.9255 | -645 | 66-493-37-2,18-23 | 454.20 | Upper slope, just west of a submarine canyon deeply incised into the slope | early Miocene | Dark greenish gray muddy siltstone, bioturbated, overprints primary parallel laminations; rare inclined, slickensided fractures with fine sand beds and devitrified tuff layers | |
| 66-493 | 16.3810 | -98.9255 | -645 | 66-493-49-7,11-13 | 575.60 | Upper slope, just west of a submarine canyon deeply incised into the slope | early Miocene | Irregular pod of coarse granular-bearing sand (quartz and metamorphic clasts) in muddy siltstone. Bioturbation and slickensides noted in siltstone | |
| 66-493 | 16.3810 | -98.9255 | -645 | 66-493-52-1,47-49 | 595.50 | Upper slope, just west of a submarine canyon deeply incised into the slope | early Miocene | Complex mixture of muddy siltstone and sandstone, olive gray, rich in quartzose granules and shell fragments. Granules angular to moderately well rounded. | Mixture due to loading and/or slumping. Sandstone cemented by calcite. Common straight fractures, 0°-90°, slickensided, various orientations |
| 66-493 | 16.3810 | -98.9255 | -645 | 66-493-52-1,59-61 | 595.60 | Upper slope, just west of a submarine canyon deeply incised into the slope | early Miocene | Complex mixture of muddy siltstone and sandstone, olive gray, rich in quartzose granules and shell fragments. Granules angular to moderately well rounded. | Mixture due to loading and/or slumping. Sandstone cemented by calcite. Common straight fractures, 0°-90°, slickensided, various orientations |
| 66-493 | 16.3810 | -98.9255 | -645 | 66-493-53-1,8-9 | 604.60 | Upper slope, just west of a submarine canyon deeply incised into the slope | early Miocene | Calcareous coarse to very coarse sandstone with shell fragments | |
| 66-493 | 16.3810 | -98.9255 | -645 | 66-493-53-1,63-65 | 605.15 | Upper slope, just west of a submarine canyon deeply incised into the slope | early Miocene | Muddy sandstone | |
| 66-493 | 16.3810 | -98.9255 | -645 | 66-493-54-2,98-100 | 616.50 | Upper slope, just west of a submarine canyon deeply incised into the slope | early Miocene | Olive gray muddy siltstone, fissile subparallel to bedding, bedding faint, faint bioturbation with fine sand layers | |
| 66-493 | 16.3810 | -98.9255 | -645 | 66-493-54-2,114-116 | 616.70 | Upper slope, just west of a submarine canyon deeply incised into the slope | early Miocene | Bedding up to 22° true, fractures dip 57°-85° | |
| 66-493 | 16.3810 | -98.9255 | -645 | 66-493-54-5,127-129 | 621.30 | Upper slope, just west of a submarine canyon deeply incised into the slope | early Miocene | Muddy siltstone, olive gray, fissile subparallel to bedding, bedding faint bioturbation faint, with fine sand layers. 12° true dip, 19° apparent dip |