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Muza, Jay Phillip (2000): Calcareous nannofossil abundance and datums of sediments from ODP Leg 170 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.788406, Supplement to: Muza, JP (2000): Calcareous nannofossil biostratigraphy from a 15-km transect (Cocos plate to Caribbean plate) across the Middle America Trench, Nicoya Peninsula, Costa Rica. In: Silver, EA; Kimura, G; Shipley, TH (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 170, 1-63, https://doi.org/10.2973/odp.proc.sr.170.008.2000

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Abstract:
Three Pleistocene, five Pliocene, and thirteen late and middle Miocene calcareous nannofossil datums have been identified in the Leg 170 cored sequences collected from a transect across the Middle America Trench off the Nicoya Peninsula. Although some nannofossil zones could not be delineated, particularly in the Pliocene and upper Miocene, there appears to be a complete or very nearly complete Pleistocene through lower Miocene section at Sites 1039 and 1040. The oldest assemblages, observed at Site 1039 and 1040, are latest early Miocene in age (nannofossil Zone NN4). These assemblages are associated with gabbro intrusions into the basal sediments (one contact metamorphic hornfels sample contains relict nannofossils), indicating an age for the intrusion event of between 15.6 and 18.2 Ma at both Sites 1039 and 1040. Reference Site 1039, located on the Cocos plate, provides the best-preserved sequence of sediments of late Pleistocene to latest early Miocene age. The sediments cored in the prism sections at Sites 1040, 1041, 1042, and 1043 all indicate that the age of nannofossil assemblages in the prism sediments, including the toe, wedge, and apron, are all Pleistocene with a considerable amount of upper Miocene reworking.
A period of low sediment accumulation rates (~5.3 m/m.y.) is recorded for Pliocene and upper Miocene sediments at Sites 1039, 1040, and 1043. Pliocene calcareous nannofossil assemblages characteristic of the ~2.5- to 3.75-m.y. time interval (nannofossil Zones NN16 and equivalent nannofossil Subzones CN12b and CN12a) were not resolved at any site. Nannofossil Zones NN15, NN14, NN13, and NN12 (early late Pliocene to early Pliocene) could not be resolved at any site either because of the absence of marker species. Within the Miocene at Sites 1039 and 1040, nannofossil Zones NN10-NN6 were difficult to differentiate because of the absence of several species that define the zonal boundaries. These intervals, where the nannofossil zones have not been resolved or are partially resolved, are primarily composed of carbonate ooze deposited during an ~8.5-m.y. (2.5-11 Ma) low sediment accumulation rate time interval. The absence of many of the marker species is attributed to warmer water conditions during those periods. Many of the same marker species are absent in the sediments recovered from nearby Deep Sea Drilling Project Site 155 in the Panama Basin.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 9.665390 * Median Longitude: -86.165988 * South-bound Latitude: 9.639700 * West-bound Longitude: -86.200100 * North-bound Latitude: 9.733700 * East-bound Longitude: -86.112300
Date/Time Start: 1996-11-01T00:00:00 * Date/Time End: 1996-12-13T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Muza, JP (2000): (Table T1) Calcareous nannofossil abundance of ODP Site 170-1039 sediments. https://doi.org/10.1594/PANGAEA.788399
  2. Muza, JP (2000): (Table T2) Calcareous nannofossil abundance of ODP Hole 170-1040B sediments. https://doi.org/10.1594/PANGAEA.788400
  3. Muza, JP (2000): (Table T3) Calcareous nannofossil abundance of ODP Hole 170-1040C sediments. https://doi.org/10.1594/PANGAEA.788401
  4. Muza, JP (2000): (Table T4) Calcareous nannofossil abundance of ODP Site 170-1041 sediments. https://doi.org/10.1594/PANGAEA.788402
  5. Muza, JP (2000): (Table T5) Calcareous nannofossil abundance of ODP Site 170-1042 sediments. https://doi.org/10.1594/PANGAEA.788403
  6. Muza, JP (2000): (Table T6) Calcareous nannofossil abundance of ODP Hole 170-1043A sediments. https://doi.org/10.1594/PANGAEA.788404
  7. Muza, JP (2000): (Table T10) Pleistocene, Pliocene, and late and middle Miocene calcareous nannofossil datums of ODP Leg 170 sites. https://doi.org/10.1594/PANGAEA.788405