Hancock, Haidi J. L.; Dickens, Gerald R. (2006): Carbonate dissolution episodes in Paleocene and Eocene sediment, Shatsky Rise, west-central Pacific. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: Bralower, Timothy J., Premoli Silva, Isabella, Malone, Mitchell J., Arthur, Michael A., Averyt, Kristen B., Bown, Paul R., Brassell, Simon C., Channell, James E. T., Clarke, Leon J., Dutton, Andrea, Eleson, Jason W., Frank, Tracy D., Gylesjo, Susanne, Hancock, Haidi J. L., Kano, Harumasa, Leckie, R. Mark, Marsaglia, Kathleen M., McGuire, Jennifer, Moe, K. T., Petrizzo, Maria Rose, Robinson, Stuart A., Roehl, Ursula, Sager, William W., Takeda, Kotaro, Thomas, Deborah, Williams, Trevor, Zachos, James C., Proceedings of the Ocean Drilling Program; scientific results; extreme warmth in the Cretaceous and Paleogene; a depth transect on Shatsky Rise, Central Pacific; covering Leg 198 of the cruises of the drilling vessel JOIDES Resolution; Yokohama, Japan, to Honolulu, Hawaii; Sites 1207-1214; 27 August-23 October 2001, 198, georefid:2006-077747

Holes 1209A and 1211A on Southern High, Shatsky Rise contain expanded, nearly continuous records of carbonate-rich sediment deposited in deep water of the equatorial Pacific Ocean during the Paleocene and Eocene. In this study, we document intervals of carbonate dissolution in these records by examining temporal changes in four parameters: carbonate content, coarse size fraction (>38 mu m), benthic foraminiferal abundance, and planktonic foraminiferal fragmentation ratio. Carbonate content is not a sensitive indicator of carbonate dissolution in the studied sections, although rare intervals of low carbonate may reflect times of relatively high dissolution. The proportion of coarse size fraction does not accurately record carbonate dissolution either because the relative abundance of nannofossils largely determines the grain-size distribution. Benthic abundance and fragmentation covary (r2 = 0.77) and are probably the best indicators for carbonate dissolution. For both holes, records of these parameters indicate two episodes of prominent dissolution. The first of these occurs in the upper Paleocene ( approximately 59-58 Ma) and the second in the middle to upper Eocene ( approximately 45-33.7 Ma). Other intervals of enhanced carbonate dissolution are located in the upper Paleocene ( approximately 56 Ma) and in the upper lower Eocene ( approximately 51 Ma). Enhanced preservation of planktonic foraminiferal assemblages marks the start of both the Paleocene and Eocene epochs.
West: 157.1500 East: 162.4600 North: 37.4800 South: 31.3400
Expedition: 198
Site: 198-1209
Site: 198-1211
Supplemental Information:
Available only on CD-ROM in PDF format and on the Web in PDF or HTML
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.198.116.2005 (c.f. for more detailed metadata)
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