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Li, Qianyu; Jian, Zhimin; Li, Baohua (2004): Planktonic foraminiferal stratigraphy, datum levels and ages of ODP Sites 184-1146 and 184-1148, South China Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.784437, Supplement to: Li, Q et al. (2004): Oligocene-Miocene planktonic foraminifer biostratigraphy, Site 1148, northern South China Sea. In: Prell, W.L., Wang, P., Blum, P., Rea, D.K., Clemens, S.C. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 184, 1-26, https://doi.org/10.2973/odp.proc.sr.184.220.2004

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Abstract:
Over 30 first and last occurrence (FO and LO, respectively) planktonic foraminifer datums were recognized from the Oligocene-Miocene section of Ocean Drilling Program (ODP) Site 1148. Most datum levels occur in similar order as, and are by correlation as probably synchronous with, their open-ocean records. Several datum levels represent local bioevents resulting from dissolution and Site 1148's unique paleoceanographic setting in the northern South China Sea. An age of 9.5-9.8 Ma is estimated for the local LO of Globoquadrina dehiscens (257 meters composite depth [mcd]), whereas the local LO of Globorotalia fohsi s.l. (301 mcd) is projected to be at ~13.0 Ma and the local FO of Globigerinatella insueta (367 mcd) is projected to be at ~18.0 Ma.
The combined planktonic foraminifer and nannofossil results indicate that the Oligocene-Miocene section at Site 1148 is not complete. Unconformities up to 2-3 m.y. in duration, occurring at and before the Oligocene/Miocene boundary (OHS1, OHS2, OHS3, and OHS4 = MHS1), are associated with slump deposits between 457 and 495 mcd that signal tectonic instability during the transition from rifting to spreading in the South China Sea. Shorter unconformities of <0.5 m.y. duration that truncate the Miocene section were more likely to have been caused by sea-bottom erosion as well as dissolution. A total of 12 Miocene unconformities, MHS1 through MHS12, are mainly affected by dissolution and an elevated carbonate compensation depth (CCD) during Miocene third-order glaciations recorded in deep-sea positive oxygen isotope Mi glaciation events. Respectively, they fall at ~457 mcd (MHS1 = Mi-1), 407 mcd (MHS2 = Mi-1a), 385 mcd (MHS3 = Mi-1aa), 366 mcd (MHS4 = Mi-1b), 358 mcd (MHS5 = MLi-1), 333 mcd (MHS6 = Mi-2), 318 mcd (MHS7 = MSi-1), 308 mcd (MHS8 = Mi-3), 295 mcd (MHS9 = Mi-4), 288 mcd (MHS10 = Mi-5), 256 mcd (MHS11 = Mi-6), and 250 mcd (MHS12 = Mi-7). The correlation of these unconformities with Mi events indicates that some related driving mechanisms have been operating, causing deepwater circulation changes concomitantly in world oceans and in the marginal South China Sea.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 18.939548 * Median Longitude: 116.516781 * South-bound Latitude: 18.836110 * West-bound Longitude: 116.272917 * North-bound Latitude: 19.456700 * East-bound Longitude: 116.565650
Date/Time Start: 1999-03-21T00:00:00 * Date/Time End: 1999-04-10T00:00:00
Event(s):
184-1146 * Latitude: 19.456700 * Longitude: 116.272917 * Date/Time Start: 1999-03-21T00:00:00 * Date/Time End: 1999-03-29T00:00:00 * Elevation: -2091.5 m * Penetration: 1455.6 m * Recovery: 1451.7 m * Location: South China Sea * Campaign: Leg184 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 153 cores; 1450.6 m cored; 5 m drilled; 100.1% recovery
184-1148 * Latitude: 18.836150 * Longitude: 116.565650 * Date/Time Start: 1999-03-30T00:00:00 * Date/Time End: 1999-04-10T00:00:00 * Elevation: -3294.5 m * Penetration: 1557.2 m * Recovery: 996.5 m * Location: South China Sea * Campaign: Leg184 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 133 cores; 1204.6 m cored; 352.6 m drilled; 82.7% recovery
184-1148A * Latitude: 18.836110 * Longitude: 116.565530 * Date/Time Start: 1999-03-30T20:15:00 * Date/Time End: 1999-04-04T16:00:00 * Elevation: -3297.1 m * Penetration: 704 m * Recovery: 632.07 m * Location: South China Sea * Campaign: Leg184 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 77 cores; 704 m cored; 0 m drilled; 89.8 % recovery
Comment:
For data from Table T4 see Li et al (2006) datasets: doi:10.1594/PANGAEA.724457.
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Li, Q; Jian, Z; Li, B (2004): (Table T2) Oligocene-Miocene planktonic foraminifer datum levels from ODP Hole 184-1148A. https://doi.org/10.1594/PANGAEA.784435
  2. Li, Q; Jian, Z; Li, B (2004): (Table T1) Miocene planktonic foraminiferal stratigraphy of ODP Hole 184-1148A. https://doi.org/10.1594/PANGAEA.784433
  3. Li, Q; Jian, Z; Li, B (2004): (Table T3) Ages of the Miocene planktonic foraminifer zonal boundaries from ODP Sites 184-1146 and 184-1148. https://doi.org/10.1594/PANGAEA.784436