Carter, Samantha Cassie; Griffith, Elizabeth M; Penman, Donald E (2018): Analysis of the middle Miocene climate transition from different Holes of IODP Site 321-U1337 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.893203, Supplement to: Carter, SC et al. (2016): Peak intervals of equatorial Pacific export production during the middle Miocene climate transition. Geology, 44(11), 923-926, https://doi.org/10.1130/G38290.1
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Abstract:
The middle Miocene climate transition (MMCT) is characterized by an abrupt 1‰ increase in benthic foraminiferal oxygen isotopes at ca. 13.8 Ma, marking expansion of the Antarctic Ice Sheet and transition of Earth's climate to a cooler, relatively stable glacial state. Also occurring during this period is a globally recognized positive carbon isotope excursion (16.9-13.5 Ma) in benthic and planktonic foraminifera with shorter carbon isotope maxima (CM) events, linking hypotheses for climate change at the time with the carbon cycle. In order to test whether export production in the eastern equatorial Pacific is related to the largest such event (CM6), coincident with Antarctic Ice Sheet expansion, a high-resolution (<5 k.y.) record of export production at Integrated Ocean Drilling Program Site U1337 spanning the MMCT (14.02-13.43 Ma) was produced using marine pelagic barite mass accumulation rates. Export production is elevated with an extended period of more than double present-day values. These variations are not orbitally paced and provide evidence for a reorganization of nutrients supplied to the eastern equatorial Pacific in the Miocene and intensification of upwelling. If such changes are representative of the entire region, then this mechanism could sequester enough carbon to have a significant effect on atmospheric pCO2. However, continual delivery of nutrients to the surface waters of the eastern equatorial Pacific is required in order to sustain export production without depleting the surface ocean of limiting nutrients. This might be accomplished by a change in ocean circulation or a combination of other processes requiring further study.
Further details:
Tian, Jun; Yang, M; Lyle, Mitchell W; Wilkens, R; Shackford, Julia K (2013): Obliquity and long eccentricity pacing of the Middle Miocene climate transition. Geochemistry, Geophysics, Geosystems, 14(6), 1740-1755, https://doi.org/10.1002/ggge.20108
Wilkens, Roy H; Dickens, Gerald Roy; Tian, Jun; Backman, Jan; Expedition 320/321 Scientists (2013): Data report: revised composite depth scales for Sites U1336, U1337, and U1338. In: Proceedings of the IODP, Integrated Ocean Drilling Program, https://doi.org/10.2204/iodp.proc.320321.209.2013
Project(s):
Coverage:
Median Latitude: 3.833445 * Median Longitude: -123.206298 * South-bound Latitude: 3.833445 * West-bound Longitude: -123.206430 * North-bound Latitude: 3.833445 * East-bound Longitude: -123.206035
Minimum DEPTH, sediment/rock: 305.47 m * Maximum DEPTH, sediment/rock: 321.22 m
Event(s):
321-U1337A * Latitude: 3.833445 * Longitude: -123.206035 * Elevation: -4472.0 m * Recovery: 420.11 m * Campaign: Exp321 (Pacific Equatorial Age Transect II / Juan de Fuca) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 48 cores; 449.8 m cored; 93.4 % recovered; 0 m drilled; 449.8 m penetrated
321-U1337C * Latitude: 3.833445 * Longitude: -123.206430 * Elevation: -4478.6 m * Recovery: 273.72 m * Campaign: Exp321 (Pacific Equatorial Age Transect II / Juan de Fuca) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 32 cores; 282.3 m cored; 96.96 % recovered; 158 m drilled; 440.3 m penetrated
321-U1337D * Latitude: 3.833445 * Longitude: -123.206430 * Elevation: -4476.5 m * Recovery: 431.97 m * Campaign: Exp321 (Pacific Equatorial Age Transect II / Juan de Fuca) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 49 cores; 442.9 m cored; 97.53 % recovered; 0 m drilled; 442.9 m penetrated
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Griffith, Elizabeth M | |||
| 2 | Latitude of event | Latitude | Griffith, Elizabeth M | |||
| 3 | Longitude of event | Longitude | Griffith, Elizabeth M | |||
| 4 | Sample code/label | Sample label | Griffith, Elizabeth M | DSDP/ODP/IODP sample designation | ||
| 5 | DEPTH, sediment/rock | Depth sed | m | Griffith, Elizabeth M | Geocode – CCSF from Wilkens et al. (2012) | |
| 6 | AGE | Age | ka BP | Griffith, Elizabeth M | Geocode – From Tian et al. (2013) | |
| 7 | Age, shift | Age shift | ka | Griffith, Elizabeth M | ||
| 8 | Accumulation rate, mass | MAR | g/cm2/ka | Griffith, Elizabeth M | ||
| 9 | Calcium carbonate | CaCO3 | % | Griffith, Elizabeth M | ||
| 10 | Accumulation rate, carbonate | Acc rate carb | g/cm2/ka | Griffith, Elizabeth M | ||
| 11 | Barium sulfate | BaSO4 | % | Griffith, Elizabeth M | ||
| 12 | Accumulation rate, barite | Acc rate Brt | mg/cm2/ka | Griffith, Elizabeth M | ||
| 13 | Carbon, flux per year | C flux | g/m2/a | Griffith, Elizabeth M | Export |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1568 data points