Shaffer, Bernard L (1980): Calcareous-nannofossil biostratigraphy at DSDP Leg 57 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.821524, Supplement to: Shaffer, BL (1980): Calcareous-nannofossil biostratigraphy of Japan Trench transect, Deep Sea Drilling Project Leg 57. In: Scientific Party, Initial Reports of the Deep Sea Drilling Project, 56/57 (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 56-57, 875-886, https://doi.org/10.2973/dsdp.proc.5657.126.1980
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Abstract:
As a continuation of the Japan Trench transect commenced by DSDP Leg 56, 10 holes were drilled and 273 cores were recovered while occupying Sites 438, 439, 440, and 441 during Leg 57. At Sites 438 and 439, near the top of the trench inner wall, a principal biostratigraphic objective was to establish a Neogene reference section overlying a pronounced acoustic basement thought to represent continental crust extending outward to this slope environment. At Sites 440 and 441, prime objectives were to distinguish, if present, admixtures of accreted oceanic and non-accreted slope materials, and to recognize repeated or missing sections resulting from the accretionary process.
This report summarizes the nannofossil biostratigraphy of the upper lower Miocene to Pleistocene sequences of Leg 57 cores. Insufficient occurrences in the lowermost Miocene, presumed upper Oligocene, and upper Cretaceous sequences at Sites 438 and 439 precluded age determinations for these intervals based on nannoliths. All but a few samples from Site 441 were barren, and in general Leg 57 nannofossil assemblages were too modified by dissolution and diagenesis to permit meaningful paleoclimatologic or paleobiogeographic conclusions to be drawn.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 40.271878 * Median Longitude: 143.520820 * South-bound Latitude: 39.735500 * West-bound Longitude: 143.231700 * North-bound Latitude: 40.630000 * East-bound Longitude: 143.929000
Date/Time Start: 1977-10-19T00:00:00 * Date/Time End: 1977-11-10T00:00:00
Event(s):
57-438 * Latitude: 40.629200 * Longitude: 143.231700 * Date/Time: 1977-10-19T00:00:00 * Elevation: -1552.0 m * Penetration: 109.5 m * Recovery: 82.1 m * Location: North Pacific/BASIN * Campaign: Leg57 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 90.5 m cored; 19 m drilled; 90.7 % recovery
57-438A * Latitude: 40.629800 * Longitude: 143.235800 * Date/Time: 1977-10-19T00:00:00 * Elevation: -1558.0 m * Penetration: 878 m * Recovery: 535.5 m * Location: North Pacific/BASIN * Campaign: Leg57 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 83 cores; 780.5 m cored; 0 m drilled; 68.6 % recovery
57-438B * Latitude: 40.630000 * Longitude: 143.246700 * Date/Time: 1977-10-19T00:00:00 * Elevation: -1564.0 m * Penetration: 1040.7 m * Recovery: 84.2 m * Location: North Pacific/BASIN * Campaign: Leg57 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 206.5 m cored; 0 m drilled; 40.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets
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Datasets listed in this publication series
- Shaffer, BL (1980): (Table 3) Nannofossil occurrence at DSDP Hole 57-438. https://doi.org/10.1594/PANGAEA.821518
- Shaffer, BL (1980): (Table 4) Nannofossil occurrence at DSDP Hole 57-438A. https://doi.org/10.1594/PANGAEA.821519
- Shaffer, BL (1980): (Table 5) Nannofossil occurrence at DSDP Holes 57-438B and 57-439. https://doi.org/10.1594/PANGAEA.821520
- Shaffer, BL (1980): (Table 6) Nannofossil occurrence at DSDP Site 57-440. https://doi.org/10.1594/PANGAEA.821522
- Shaffer, BL (1980): (Table 7) Nannofossil occurrence at DSDP Hole 57-440B. https://doi.org/10.1594/PANGAEA.821523