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Nathan, Stephen A; Leckie, R Mark (2003): Planktonic foraminifera stratigraphy and datums of ODP Site 184-1143 and Hole 184-1146A, South China Sea. PANGAEA,, Supplement to: Nathan, SA; Leckie, RM (2003): Miocene planktonic foaminiferal biostratigraphy of Sites 1143 and 1146, ODP Leg 184, South China Sea. In: Prell, WL; Wang, P; Blum, P; Rea, DK; Clemens, SC (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 184, 1-43,

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The biostratigraphy of Miocene-age sediment samples recovered from Ocean Drilling Program Sites 1143 and 1146, South China Sea, is presented. The preservation of the planktonic foraminifers recovered from both sites varies widely, from poor to very good. The volume of biogenic sediment in the >63-µm size fraction also varies considerably, with many samples being dominated by mud. In comparison to shipboard biostratigraphy, based on core catcher analyses with a depth resolution of ~10 m, we analyzed samples from the two stratigraphic columns every 2-3 m (~45- to 93-k.y. resolution). The placement of planktonic foraminifer zonal boundaries was made at a resolution of ~1.5 m at Site 1146 and ~3.0 m at Site 1143. The higher resolution has resulted in significant changes in biostratigraphic zonal boundary locations compared to shipboard results.
For the time interval of 5.54-10.49 Ma, the changes in zonation reveal similar age-depth models at both sites, with three segments of changing sedimentation rate through the upper Miocene, though the differences in sedimentation rates at Site 1146 are subtler than those at Site 1143. The boundary between lithologic Units II and III at Site 1146 corresponds to a sharp change in sedimentation rate (58 to 21 m/m.y.) at 15.1 Ma (the first occurrence of Orbulina suturalis). At this site, the interval from 16.4 to 15.1 Ma is characterized by very high mass accumulation rates in the noncarbonate fraction. Above this interval the carbonate fraction becomes increasingly important in the sediment flux to the South China Sea. At Site 1143, sedimentation rates increase from 8 to 99 m/m.y. at 8.6 Ma. This corresponds to a dramatic increase in both carbonate and noncarbonate mass accumulation rates at the site, but no change in lithology.
Median Latitude: 14.409305 * Median Longitude: 114.778940 * South-bound Latitude: 9.361880 * West-bound Longitude: 113.285030 * North-bound Latitude: 19.456680 * East-bound Longitude: 116.272710
Date/Time Start: 1999-03-03T16:00:00 * Date/Time End: 1999-03-25T13:30:00
184-1143A * Latitude: 9.361980 * Longitude: 113.285030 * Date/Time Start: 1999-03-03T16:00:00 * Date/Time End: 1999-03-06T23:45:00 * Elevation: -2771.0 m * Penetration: 400 m * Recovery: 377.88 m * Location: South China Sea * Campaign: Leg184 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 44 cores; 400 m cored; 0 m drilled; 94.5 % recovery
184-1143C * Latitude: 9.361880 * Longitude: 113.285310 * Date/Time Start: 1999-03-08T00:10:00 * Date/Time End: 1999-03-10T05:45:00 * Elevation: -2773.5 m * Penetration: 500 m * Recovery: 477.54 m * Location: South China Sea * Campaign: Leg184 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 54 cores; 500 m cored; 0 m drilled; 95.5 % recovery
184-1146A * Latitude: 19.456680 * Longitude: 116.272710 * Date/Time Start: 1999-03-21T23:45:00 * Date/Time End: 1999-03-25T13:30:00 * Elevation: -2091.1 m * Penetration: 607 m * Recovery: 603.85 m * Location: South China Sea * Campaign: Leg184 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 64 cores; 607 m cored; 0 m drilled; 99.5 % recovery
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