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Hall, Ian R; McCave, I Nick; Zahn, Rainer; Carter, Lionel; Knutz, Paul Cornils; Weedon, Graham P (2003): (Table 1) Age comparison between the GPTS and ODP Site 181-1123 age model for each chron base within the Middle Miocene section [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.841718, Supplement to: Hall, IR et al. (2003): Paleocurrent reconstruction of the deep Pacific inflow during the middle Miocene: Reflections of East Antarctic Ice Sheet growth. Paleoceanography, 18(2), 1040, https://doi.org/10.1029/2002PA000817

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Abstract:
Today the deep western boundary current (DWBC) east of New Zealand is the most important route for deep water entering the Pacific Ocean. Large-scale changes in deep water circulation patterns are thought to have been associated with the development of the East Antarctic Ice Sheet (EAIS) close to the main source of bottom water for the DWBC. Here we reconstruct the changing speed of the southwest Pacific DWBC during the middle Miocene from ~15.5-12.5 Ma, a period of significant global ice accumulation associated with EAIS growth. Sortable silt mean grain sizes from Ocean Drilling Program Site 1123 reveal variability in the speed of the Pacific inflow on the timescale of the 41 kyr orbital obliquity cycle. Similar orbital period flow changes have recently been demonstrated for the Pleistocene epoch. Collectively, these observations suggest that a strong coupling between changes in the speed of the deep Pacific inflow and high-latitude climate forcing may have been a persistent feature of the global thermohaline circulation system for at least the past 15 Myr. Furthermore, long-term changes in flow speed suggest an intensification of the DWBC under an inferred increase in Southern Component Water production. This occurred at the same time as decreasing Tethyan outflow and major EAIS growth between ~15.5 and 13.5 Ma. These results provide evidence that a major component of the deep thermohaline circulation was associated with the middle Miocene growth of the EAIS and support the view that this time interval represents an important step in the development of the Neogene icehouse climate.
Project(s):
Coverage:
Latitude: -41.786000 * Longitude: -171.498980
Date/Time Start: 1998-09-14T23:55:00 * Date/Time End: 1998-09-19T09:55:00
Minimum DEPTH, sediment/rock: 416.10 m * Maximum DEPTH, sediment/rock: 470.29 m
Event(s):
181-1123B * Latitude: -41.786000 * Longitude: -171.498980 * Date/Time Start: 1998-09-14T23:55:00 * Date/Time End: 1998-09-19T09:55:00 * Elevation: -3289.8 m * Penetration: 489 m * Recovery: 451.4 m * Location: South Pacific Ocean * Campaign: Leg181 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 52 cores; 489 m cored; 0 m drilled; 92.3 % recovery
Comment:
DEPTH, sediment/rock [m] is given in mbsf.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
ChronozoneChronozoneHall, Ian R
Sample code/labelSample labelHall, Ian RDSDP/ODP/IODP sample designation
DEPTH, sediment/rockDepth sedmGeocode
Depth, composite revisedDepth comp rrmcdHall, Ian R
Age modelAge modelkaHall, Ian RAge model, Berggren et al (1995) BKSA95GPTS
Age model, optionalAge model optkaHall, Ian R181-1123
Age, differenceAge diffkaHall, Ian RGPTS - 181-1123 age
Size:
96 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Chronozone

Sample label

Depth sed [m]

Depth comp r [rmcd]

Age model [ka]

Age model opt [ka]

Age diff [ka]
C5Ar.1r181-1123B-45X-3,50416.10432.101267812659-19
C5Ar.1n181-1123B-46X-1,76422.96434.1912708127102
C5Ar.2r181-1123B-46X-2,60424.30436.6112775127750
C5Ar.2n181-1123B-46X-2,145425.15438.2812819128190
C5Ar.3r181-1123B-47X-1,19431.99443.521299112989-2
C5AAn181-1123B-47X-3,39435.19449.5113139131401
C5AAr181-1123B-48X-2,15443.15456.7713302133020
C5ABn181-1123B-48X-3,66445.16462.241351013490-20
C5ABr181-1123B-49X-2,30452.60466.49137031373128
C5ACn181-1123B-49X-3,111454.91469.94140761410832
C5ACr181-1123B-49X-4,2456.32471.83141781419315
C5ADn181-1123B-50X-2,29462.19475.4214612146120
C5ADr181-1123B-50X-3,145464.85478.4114800148000
C5Bn.1n181-1123B-50X-4,147465.29478.971488814848-40
C5Bn.1r181-1123B-50X-5,127467.67481.70150341505319
C5Bn.2n181-1123B-51X-1,29470.29482.59151551517419