Jennings, Robert H; Mazzullo, James M (1985): (Table 1) Age and description, showing diagenetic changes with depth at DSDP Site 80-550 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.807822, Supplement to: Jennings, RH; Mazzullo, JM (1985): Shallow burial diagenesis of chalks and related sediments at Site 550 on the Goban Spur. In: De Graciansky, PC; Poag, CW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Gov. Printing Office), 80, 853-861, https://doi.org/10.2973/dsdp.proc.80.136.1985
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Abstract:
Leg 80 of the Deep Sea Drilling Project drilled four coreholes through syn- and postrift sediments on the seaward edge of the Goban Spur in the Bay of Biscay. A relatively thin sedimentary veneer composed of nannofossil chalk and calcareous and siliceous mudstone was cored, providing the opportunity to document the effects of burial depth and other factors on the porosity of chalks by means of the scanning electron microscope. Four diagenetic "fades" were described from SEM analysis of the chalks; in order of increasing depth they are (1) mechanical compaction facies, (2) a transitional facies with both mechanical and chemical compaction features, (3) a chemical compaction facies, and (4) a cement-inhibited facies. It appears that advanced stages of cementation and lithification can occur in pure chalks at relatively shallow depths of burial (100-700 m) but can be inhibited by the presence of clays and coarser grained detritus.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 48.515600 * Median Longitude: -13.439100 * South-bound Latitude: 48.515200 * West-bound Longitude: -13.439500 * North-bound Latitude: 48.516000 * East-bound Longitude: -13.438700
Date/Time Start: 1981-06-30T00:00:00 * Date/Time End: 1981-06-30T00:00:00
Minimum DEPTH, sediment/rock: 105 m * Maximum DEPTH, sediment/rock: 683 m
Event(s):
80-550A * Latitude: 48.515200 * Longitude: -13.439500 * Date/Time: 1981-06-30T00:00:00 * Elevation: -4420.0 m * Penetration: 95 m * Location: North Atlantic/PLAIN * Campaign: Leg80 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: OPERATIONAL LIMIT REACHED
80-550B * Latitude: 48.516000 * Longitude: -13.438700 * Date/Time: 1981-06-30T00:00:00 * Elevation: -4420.0 m * Penetration: 720.5 m * Recovery: 177.8 m * Location: North Atlantic/PLAIN * Campaign: Leg80 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 30 cores; 264.5 m cored; 133 m drilled; 67.2 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Jennings, Robert H | DSDP/ODP/IODP sample designation | ||
| 3 | Identification | ID | Jennings, Robert H | |||
| 4 | Depth, top/min | Depth top | m | Jennings, Robert H | ||
| 5 | Depth, bottom/max | Depth bot | m | Jennings, Robert H | ||
| 6 | DEPTH, sediment/rock | Depth sed | m | Geocode – mbsf | ||
| 7 | Stage | Stage | Jennings, Robert H | |||
| 8 | Description | Description | Jennings, Robert H |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
60 data points
Data
| 1 Event | 2 Sample label | 3 ID | 4 Depth top [m] | 5 Depth bot [m] | 6 Depth sed [m] | 7 Stage | 8 Description |
|---|---|---|---|---|---|---|---|
| 80-550A | 80-550A-2-1,55-58 | 1 | 100 | 110 | 105 | early Pliocene | Disarticulated coccospheres; some mechanical compaction and fragmentation of coccoliths |
| 80-550A | 80-550A-11-2,100-102 | 2 | 185 | 195 | 190 | late Miocene | More intense mechanical compaction, fragmentation, and formation of a larger number of broken coccoliths; reduction of pore space |
| 80-550A | 80-550A-19-2,67-71 | 3 | 260 | 270 | 265 | middle Miocene | Coccolith fragments and coccoliths in equal amounts; some dissolution of individual calcite laths |
| 80-550A | 80-550A-29-4,41-44 | 4 | 355 | 365 | 360 | early Eocene | Fragmented coccoliths, more dissolution of coccolith shields; some early cement, reduced porosity |
| 80-550A | 80-550A-37-1,64-66 | 5 | 432 | 442 | 437 | late Paleocene | Dissolution and cementation evident; some recrystallization of calcite; overgrowths present |
| 80-550B | 80-550B-2-2,127-129 | 6 | 470 | 480 | 475 | Campanian | Extensive calcite overgrowth, cement; intense chemical compaction, crystallization |
| 80-550B | 80-550B-8-1,123-125 | 7 | 524 | 534 | 529 | Maestrichtian | Extensive overgrowths, reprecipitation features; complete coccolith dissolution; low porosity |
| 80-550B | 80-550B-13-1,1-2 | 8 | 569 | 579 | 574 | Santonian or Coniacian | Large areas of overgrowth, calcite cement; welded texture; a few porous zones |
| 80-550B | 80-550B-15-5,85-89 | 9 | 588 | 598 | 593 | middle Cenomanian | Minor overgrowths and spot welding, moderate porosity; scarce patchy cement; clays present |
| 80-550B | 80-550B-25-3,38-40 | 10 | 680 | 686 | 683 | late Albian | Moderate porosity, some spot welding and pressure solution; not much cementation; clays present |