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Heusser, Linda E (1992): Palynology of ODP Leg 127 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.771195, Supplement to: Heusser, LE (1992): Neogene palynology of Holes 794A, 795A, and 797B in the Sea of Japan: stratigraphic and paleoenvironmental implications of the preliminary results. In: Pisciotto, KA; Ingle, JCJr.; von Breymann, MT; Barron, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(1), 325-339, https://doi.org/10.2973/odp.proc.sr.127128-1.139.1992

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Abstract:
This initial survey of pollen from 192 samples from Hole 794A, supplemented by 189 samples from Hole 795 and 797B, suggests that marine pollen assemblages from the southwestern Sea of Japan provide a consistent Neogene pollen stratigraphy and a solid basis for regional paleoenvironmental reconstructions.
Late Miocene vegetation inferred from these pollen data, a mix of conifer and broad-leaf elements with now-extinct Tertiary types well represented, appears similar to Aniai-type floras of Japan. During the late Miocene through early Pliocene, as Tertiary types declined, conifers (including the Sequoia/Cryptomeria group) became more prominent than broad-leaf elements, and herbs played an increasing role in the vegetation.
Middle Pliocene pollen assemblages imply significant changes in forest composition. In a 500,000-yr interval centered at ~4 m.y., Tertiary and warm-temperate deciduous types re-expanded and were comparable to or greater than middle-late Miocene levels. Temperate and cold-temperate conifers {Picea, Abies, Tsuga) were minimal. Subsequently, Tertiary and deciduous forest components (including Quercus) decreased, Picea, Tsuga, and Abies were again prominent, and herbs formed an increasingly larger part of the vegetation. Between ~3 m.y. and -2.5 m.y., conifers, except for Cryptomeria types, were prominent, Quercus continued to decline, and other broad-leaf trees were minor. Over the last 2 Ma, the very large and frequent changes in forest composition inferred from pollen in the Sea of Japan correspond to forest dynamics inferred from changes in pollen and floral assemblages throughout Japan.
Given present vegetation/climate relationships, broad trends in Neogene climate inferred from these preliminary pollen data include decreasing temperatures, increasing seasonality in temperatures and precipitation, and increasing amplitude and frequency of climatic change. Two significant events, centered at ~9 m.y. and ~4 m.y., punctuate the gradual deterioration of the equable warm, humid subtropical/warm temperate late Miocene and early Pliocene climates. The first indication of cold-temperate conditions comparable to those of Pleistocene glacial intervals occurs ~3 m.y. Subsequently, regional climates oscillated rapidly between temperate and cold-temperate regimes that supported conifer and mixed broad-leaf forests; however, climatic extremes were apparently never great enough to displace warm-temperate and temperate forests from Honshu nor to produce arctic climates on the west coast of Japan.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 41.005100 * Median Longitude: 137.145917 * South-bound Latitude: 38.616000 * West-bound Longitude: 134.536000 * North-bound Latitude: 43.987000 * East-bound Longitude: 138.967000
Date/Time Start: 1989-06-26T00:00:00 * Date/Time End: 1989-08-18T00:00:00
Event(s):
127-794 * Latitude: 40.190000 * Longitude: 138.231000 * Date/Time Start: 1989-06-26T00:00:00 * Date/Time End: 1989-07-11T00:00:00 * Elevation: -2821.3 m * Penetration: 1554 m * Recovery: 422.8 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 78 cores; 694.4 m cored; 0 m drilled; 60.9% recovery
127-794A * Latitude: 40.190000 * Longitude: 138.231000 * Date/Time Start: 1989-06-26T15:15:00 * Date/Time End: 1989-06-30T12:15:00 * Elevation: -2822.0 m * Penetration: 351.3 m * Recovery: 302.17 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 351.3 m cored; 0 m drilled; 86 % recovery
127-795 * Latitude: 43.987000 * Longitude: 138.966000 * Date/Time Start: 1989-07-12T00:00:00 * Date/Time End: 1989-07-22T00:00:00 * Elevation: -3310.5 m * Penetration: 1128.1 m * Recovery: 447.2 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 80 cores; 761.9 m cored; 0 m drilled; 58.7% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Heusser, LE (1992): (Appendix A) Pollen abundances in ODP Hole 127-794A. https://doi.org/10.1594/PANGAEA.771187
  2. Heusser, LE (1992): (Appendix B) Pollen abundances in ODP Hole 127-795A. https://doi.org/10.1594/PANGAEA.771188
  3. Heusser, LE (1992): (Appendix C) Pollen abundances in ODP Hole 127-797B. https://doi.org/10.1594/PANGAEA.771189
  4. Heusser, LE (1992): (Table 2) Sedimentation and accumulation rates of ODP Leg 127 sites. https://doi.org/10.1594/PANGAEA.771186