Stein, Ruediger; Rullkötter, Jürgen; Welte, Dietrich Hugo (1989): Sedimentological, organic petrographic and organic chemical characteristics of Albian and Cenomanian/Turonian black shales from the North Altlantic (Tab. 3, 4) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.667191, Supplement to: Stein, R et al. (1989): Changes in paleoenvironments in the Atlantic Ocean during Cretaceous times: results from black shales studies. Geologische Rundschau, 78(3), 883-901, https://doi.org/10.1007/BF01829328
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Abstract:
Large parts of the Cretaceous Atlantic Ocean are characterized by the wide-spread deposition of organic-carbon-rich sediments ("black shales“), with a maximum occurrence during Aptian/Albian and Cenomanian/Turonian times. In order to explain the origin of these black shales, changes in the amount and type of organic matter in relation to changes in paleogeography, paleoceanic circulation, and paleoclimate have been investigated in detail. The study is mainly based on calculation of accumulation rates of marine and terrigenous organic carbon, organic carbon/sedimentation rate relationships, and estimates of paleoproductivity. Because both the amount and type of organic matter in the black shales change markedly with location and age, different mechanisms must have caused the accumulation of these organic-carbon-rich sediments:
(1) Terrigenous organic matter supply was the dominant factor for black shale formation during Hauterivian and Albian times in the Northwest Atlantic.
(2) Increased oceanic productivity was important for black shale deposition in the Northeast Atlantic during Albian times.
(3) Increased preservation of (marine) organic matter in anoxic environments due to extremely reduced deep-water circulation was probably the main cause for the formation of Cenomanian/Turonian black shales, rather than increased supply of organic matter due to higher oceanic productivity.
(4) Locally, rapid burial by turbidites may have been an important mechanism for increased preservation of organic matter.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 27.526500 * Median Longitude: -43.701775 * South-bound Latitude: 12.486800 * West-bound Longitude: -75.381700 * North-bound Latitude: 35.495200 * East-bound Longitude: -9.349700
Date/Time Start: 1975-03-03T00:00:00 * Date/Time End: 1983-05-05T00:00:00
Minimum DEPTH, sediment/rock: 618.0 m * Maximum DEPTH, sediment/rock: 1132.6 m
Event(s):
41-367 * Latitude: 12.486800 * Longitude: -20.047200 * Date/Time: 1975-03-03T00:00:00 * Elevation: -4748.0 m * Penetration: 1153 m * Recovery: 173.6 m * Location: North Atlantic/BASIN * Campaign: Leg41 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 342 m cored; 0 m drilled; 50.8 % recovery
76-534A * Latitude: 28.343300 * Longitude: -75.381700 * Date/Time: 1980-10-21T00:00:00 * Elevation: -4971.0 m * Penetration: 1666.5 m * Recovery: 612.4 m * Location: North Atlantic/BASIN * Campaign: Leg76 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 127 cores; 1113.1 m cored; 31.5 m drilled; 55 % recovery
79-547B * Latitude: 33.780700 * Longitude: -9.349700 * Date/Time: 1981-05-03T00:00:00 * Elevation: -3938.0 m * Penetration: 1030 m * Recovery: 153.2 m * Location: North Atlantic/PLATEAU * Campaign: Leg79 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 36 cores; 305.5 m cored; 0 m drilled; 50.1 % 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 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Sample code/label | Sample label | Stein, Ruediger | DSDP/ODP/IODP sample designation | ||
| 7 | Epoch | Epoch | Stein, Ruediger | |||
| 8 | Lithology/composition/facies | Lithology | Stein, Ruediger | |||
| 9 | Lithology/composition/facies | Lithology | Stein, Ruediger | continued | ||
| 10 | Carbon, organic, total | TOC | % | Stein, Ruediger | Element analyser CHN, LECO | |
| 11 | Hydrogen index, mass HC, per unit mass total organic carbon | HI, HC/TOC | mg/g | Stein, Ruediger | ||
| 12 | Maceral | Maceral | Stein, Ruediger | |||
| 13 | Maceral | Maceral | Stein, Ruediger | continued | ||
| 14 | Nonaromatic hydrocarbon fraction | nonaro fraction | Stein, Ruediger | |||
| 15 | Comment | Comment | Stein, Ruediger |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
34 data points