EMP and SIMS studies on Mn/Ca and Fe/Ca systematics in benthic foraminifera from the Peruvian OMZ: A contribution to the identification of potential redox proxies and the impact of cleaning protocols

Biogeosciences

Volumn 9, Issue 1, 2012, Pages 341-359

  Glock, N ^a,b   Eisenhauer, A ^b   Liebetrau, V ^b   Wiedenbeck, M ^c   Hensen, C ^b   Nehrke, G ^d  

^a UNIVERSITY OF KIEL   (Germany)

^b GEOMAR HELMHOLTZ CENTRE FOR OCEAN RESEARCH KIEL   (Germany)

^c GFZ GERMAN RESEARCH CENTRE FOR GEOSCIENCES   (Germany)

^d ALFRED WEGENER INSTITUTE FOR POLAR AND MARINE RESEARCH   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

BENTHIC FORAMINIFERA; CARBONATE; CONCENTRATION (COMPOSITION); IDENTIFICATION METHOD; METAL; OXIDE; OXYGEN MINIMUM LAYER; POLLUTION EFFECT; POREWATER; REDOX POTENTIAL; SURFICIAL SEDIMENT; TAXONOMY; WATER DEPTH;

BOLIVIA; PERU;

BOLIVINA; FORAMINIFERA; UVIGERINA PEREGRINA;

EID: 84863641639     PISSN: 17264170     EISSN: 17264189     Source Type: Journal    
DOI: 10.5194/bg-9-341-2012     Document Type: Article

References (100)

1. Allison, N. and Austin, W. E. N.: The potential of ion micro-probe analysis in detecting geochemical variations across individual foraminifera tests, Geochem. Geophys. Geosyst., 4, 8403, doi:10.1029/2002GC000430, 2003.
2. Baker M. E., Ramirez-Liodra, K., and Perry, D.: ChEssBase: an online information system on biodiversity and biogeography of deep-sea chemosynthetic ecosystems, Version 3. World Wide Web electronic publications, http://www.noc.soton.ac.uk/chess/2010.
3. Barker, S., Greaves, M., and Elderfield, H.: A study of cleaning procedures used for foraminiferal Mg/Ca paleother-mometry, Geochem. Geophys. Geosyst., 4, 8407, 2003 doi:10.1029/2003GC000559, 2003.
4. Bé, A. W. H.: Shell Porosity of Recent Planktonik Foraminifera as a Climatic Index, Science, 161, 881-884, 1968.
5. Bender, M. L. and Heggie, D. T.: Fate of organic carbon reaching the deep sea floor: a status report, Geochim. Cosmochim. Acta, 48, 977-986, 1984.
6. Bernhard, J. M., Buck, K. R., and Barry, J. P.: Monterey Bay cold-seep biota: Assemblages, abundance, and ultrastructure of living foraminifera, Deep-Sea Res. I, 48, 2233-2249, 2001. (Pubitemid 32692910)
7. Bertram, M. A. and Cowen, J. P.: Biomineralization in Agglutinating Foraminifera: An Analytical SEM Investigation of External Wall Composition in Three Small Test Forms, Aquat. Geochem., 4, 455-468, 1998. (Pubitemid 29199135)
8. Bertram, C. J., Elderfield, H., Shackleton, N. J., and MacDonald, J. A.: Cadmium/calcium and carbon isotope reconstructions of the glacial northeast Atlantic Ocean, Paleoceanography, 10, 563-578, 1995. (Pubitemid 26438592)
9. Bice, K. L., Layne, G. D., and Dahl, K.: Application of secondary ion mass spectrometry to the determination of Mg/Ca in rare, delicate, or altered planktonic foraminifera: Examples from the Holocene, Paleogene, and Cretaceous, Geochem. Geophys. Geosyst., 6, Q12P07, doi:10.1029/2005GC000974, 2005.
10. Boyle, E. A.: Cadmium, zinc, copper and barium in foraminifera tests, Earth Planet Sc. Lett., 53, 11-35, 1981.
11. Boyle, E. A.: Manganese carbonate overgrowths on foraminifera tests, Geochim. Cosmochim. Acta, 47, 1815-1819, 1983.
12. Boyle, E. A.: Cadmium: Chemical tracer of deep-water paleo-ceanography, Paleoceanography, 3, 471-489, 1988. (Pubitemid 19304362)
13. Boyle, E. A. and Keigwin, L. D.: Comparison of Atlantic and Pacific paleochemical records for the last 215,000 years: Changes in deep ocean circulation and chemical inventories, Earth Planet. Sci. Lett., 76, 135-150, 1985.
14. Burdige, D. J.: The biogeochemistry of manganese and iron reduction in marine sediments, Earth-Sci. Rev., 35, 249-284, 1993. (Pubitemid 24394694)
15. Came, R. E., Oppo, D. W., and Curry, W. B.: Atlantic Ocean circulation during the Younger Dryas: Insights from a new Cd/Ca record from the western subtropical South Atlantic, Pa-leoceanography, 18, 1086, doi:10.1029/ 2003PA000888, 2003.
16. Delaney, M. L.: Miocene benthic foraminiferal Cd/Ca records: South Atlantic and western Equatorial Pacific, Paleoceanogra-phy, 5, 743-760, 1990.
17. Eggins, S., De Deckker, P., and Marshall, J.: Mg/Ca variation in planktonic foraminifera tests: Implications for reconstructing pa-leoseawater temperature and habitat migration, Earth Planet. Sci. Lett., 6694, 1-16, 2003.
18. Eggins, S., Sadekov, A., and De Deckker, P.: Modulation and daily banding of Mg/Ca in Orbulina universa tests by symbiont photosynthesis and respiration: A complication for seawater thermom-etry?, Earth Planet. Sci. Lett., 225, 411-419, 2004. (Pubitemid 39605255)
19. Elderfield, H. and Ganssen, G.: Past temperature and δ18O of surface ocean waters inferred from foraminiferal Mg/Ca ratios, Nature, 405, 442-445, 2000. (Pubitemid 30367417)
20. Erez, J.: The source of ions for biomineralization in foraminifera and their implications for paleoceanographic proxies, in: Biomineralization: Mineralogical Society of America, edited by: Dove, P. M., De Yoreo, J. J., and Weiner, S., Washington DC, 115-149, 2003.
21. Erez, J., Levenson, Y., and Almogi-Labin, A.: Biomineralization and seawater dynamics in foraminifera studied with the fluorescent dye Calcein, Goldschmitt Conference Abstracts, p. 815, 2011.
22. Fhlaithearta, S. N., Reichart, G.-J., Jorissen, F. J., Fontanier, C., Rehling, E. J., Thomson, J., and De Lange, G. J.: Reconstructing the seafloor environment during sapropel formation using benthic foraminiferal trace metals, stable isotopes, and sediment composition, Paleoceanography, 25, PA4225, doi:10.1029/2009PA001869, 2010.
23. Foster, G. L.: Seawater pH, pCO2 and [CO23-] variations in the Caribbean Sea over the last 130 kyr: a boron isotope and B/Ca study of planktic foraminifera, Earth Planet. Sc. Lett., 271, 254-266, 2008.
24. Froelich, P. N., Klinkhammer, G. P., Bender, M. L., Luedtke, N. A., Heath, G. R., Cullen, D., Dauphin, P., Hammond, D., Hartman, B., and Maynard, V.: Early oxidation of organic matter in pelagic sediments of the eastern equatorial Atlantic: suboxic diagenesis, Geochim. Cosmochim. Acta, 43, 1075-1090, 1987.
25. Gaetani, G. A. and Cohen, A. L.: Element partitioning during precipitation of aragonite from seawater: A framework for understanding paleoproxies, Geochim. Cosmochim. Acta, 70, 4117-4137, 2006.
26. Gehlen, M., Bassinot, F., Beck, L., and Khodja, H.: Trace element cartography of Globigerinoides ruber shells using particle-induced X-ray emission, Geochem. Geophys. Geosyst., 5, Q12D12, doi:10.1029/2004GC000822, 2004.
27. Glock, N., Eisenhauer, A., Milker, Y., Liebetrau, V., Schönfeld, J., Mallon, J., Sommer, S., and Hensen, C.: Environmental influences on the pore-density in tests of Bolivina spissa, J. Foraminiferal Res., 41, 22-32, 2011.
28. Glud, R. N., Thamdrup, B., Stahl, H., Wenzhoefer, F., Glud, A., No-maki, H., Oguri, K., Revsbech, N. P., and Kitazato, H.: Nitrogen cycling in a deep ocean margin sediment (Sagami Bay, Japan), Limnol. Oceanogr., 54, 723-734, 2009.
29. Goldstein, S. T. and Corliss, B. H.: Deposit feeding in selected deep-sea and shallow-water benthic foraminifera, Deep-Sea Res., 41, 229-241, 1994. (Pubitemid 2062370)
30. Gooday, A. J., Todo, Y., Uematsu, K., and Kitazato, H.: New organic-walled Foraminifera (Protista) from the ocean's deepest point, the Challenger Deep (western Pacific Ocean), Zool. Journ. of the Linn. Soc., 153, 399-423, 2008. (Pubitemid 351871564)
31. Granina, L., Müller, B., and Wehrli, B.: Origin and dynamics of Fe and Mn sedimentary layers in Lake Baikal, Chem. Geol., 205, 55-72, 2004. (Pubitemid 38549699)
32. Greaves, M., Caillon, N., Rebaubier, H., Bartoli, G., Bohaty, S., Cacho, I., Clarke, L., Cooper, M., Daunt, C., Delaney, M., deMenocal, P., Datton, A., and Eggins, S.: Interlabo-ratory comparison of calibration standards for foraminiferal Mg/Ca thermometry, Geochem. Geophys. Geosyst., 9, Q08010, doi:10.1029/2008GC001974, 2008.
33. Gross, O.: Foraminifera, in: European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification, edited by: Costello, M. J., Emblow, C. S., and White, R., Collection Patrimoines Naturels, 50, 60-75, 2001.
34. Guitiérrez, D., Enŕ?quez, E., Purca, S., Quipúzcoa, L., Marquina, R., Flores, G., and Graco, M.: Oxygenation episodes on the continental shelf of central Peru: Remote forcing and benthic ecosystem response, Prog. Oceanogr., 79, 177-189, 2008.
35. Haley, B. A. and Klinkhammer, G. P.: Development of a flow-through system for cleaning and dissolving foraminiferal tests, Chem. Geol., 185, 51-69, 2002. (Pubitemid 34466046)
36. Haley, B. A., Klinkhammer, G. P., and Mix, A. C.: Revisiting the rare earth elements in foraminiferal tests, Earth Planet. Sc. Lett., 239, 79-97, 2005. (Pubitemid 41614300)
37. Hall, J. M. and Chan, L.-H.: Ba/Ca in Neogloboquadrina pachy-derma as an indicator of deglacial meltwater discharge into the western Arctic Ocean, Paleoceanography, 19, PA4018, doi:10.1029/2004PA001028, 2004a. (Pubitemid 40447413)
38. Hall, J. M. and Chan, L.-H.: Ba/Ca in benthic foraminifera: Thermocline and middepth circulation in the North Atlantic during the last glaciations, Paleoceanography, 19, PA1017, doi:10.1029/2003PA000910, 2004b.
39. Harding, D. J., Arden, J. W., and Rickaby, R. E. M.: A method for precise analysis of trace element/calcium ratios in carbonate samples using quadrupole inductively coupled plasma mass spectrometry, Geochem. Geophys. Geosyst., 7, Q06003, doi:10.1029/2005GC001093, 2006.
40. Hastings, D. W., Emerson, S., Erez, J., and Nelson, B. K.: Vanadium incorporation in foraminiferal calcite as a paleotracer for seawater vanadium concentrations, Geochim. Cosmochim. Acta, 19, 3701-3715, 1996a.
41. Hastings, D. W., Emerson, S. E., and Nelson, B.: Determination of picogram quantities of vanadium in foraminiferal calcite and seawater by isotope dilution inductively coupled plasma mass spectrometrwy ith electrothermavla porization, Anal. Chem., 68, 371-378, 1996b.
42. Hastings, D. W., Emerson, S. R., and Mix, A. C.: Vanadium in foraminiferal calcite as a tracer for changes in the areal extent of reducing sediments, Paleoceanography, 11, 665-678, 1996c.
43. Hastings, D. W., Russell, A. D., and Emerson, S. R.: Foraminiferal magnesium in Globeriginoides sacculifer as a paleotemperature proxy, Paleoceanography, 13, 161-169, 1998.
44. Hathorne, E. C., Alard, O., James, R. H., and Rogers, N. W.: Determination of intratest variability of trace elements in foraminifera by laser ablation inductively coupled plasma-mass spectrometry, Geochem. Geophys. Geosyst., 4, 8408, doi:10.1029/2003GC000539, 2003.
45. Heinz, P., Sommer, S., Pfannkuche, O., and Hemleben, C.: Living benthic foraminifera in sediments influenced by gas hydrates at the Cascadia convergent margin, NE Pacific, Mar. Ecol. Prog. Ser., 304, 77-89, 2005. (Pubitemid 43096925)
46. Heinz, P., Ruschmeier, W., and Hemleben, C.: Live benthic foraminiferal assemblages at the Pacific continental margin of Costa Rica and Nicaragua, Journal of Foraminiferal Research, 38, 215-227, 2008.
47. Kasemann, S. A., Schmitt, D. N., Bijma, J., and Foster, G. L.: In situ boron isotope analysis in marine carbonates and its application for foraminifera and palaeo-pH, Chemical Geology, 260, 138-147, 2009.
48. Kunioka, D., Shirai, K., Takahata, N., Sano, Y., Toyofuku, T., and Ujiie, Y.: Microdistribution of Mg/Ca, Sr/Ca and Ba/Ca ratios in Pulleniatina obliquiloculata test by using NanoSIMS: implication for the vital effect mechanism,Geochem. Geophys. Geosyst., 7, Q12P20. doi:10.1029/2006GC001280, 2006.
49. Lea, D. W.: Trace elements in foraminiferal calcite Modern Foraminifera, edited by: Sen Gupta, B. K., Kluwer Academic Publishers, New York, Boston, Dordrecht, London, Moscow, 201-216, 2003.
50. Lea, D. W. and Boyle, E. A.: Barium content of benthic foraminifera controlled by bottom-water composition, Nature, 338, 751-753, 1989.
51. Lea, D. W. and Boyle, E. A.: Foraminiferal reconstruction of barium distributions in water masses of the glacial oceans, Paleo-ceanography, 5, 719-742, 1990a.
52. Lea, D. W. and Boyle, E. A.: A 210,000-year record of barium variability in the deep northwest Atlantic Ocean, Nature, 347, 269-272, 1990b. (Pubitemid 120015038)
53. Lea, D. W. and Boyle, E. A.: Barium in planktonic foraminifera, Geochim. Cosmochim. Acta, 55, 3321-3331, 1991.
54. Lea, D. W. and Spero, H. J.: Experimental determination of barium uptake in shells of the planktonic foraminifera Orbulina universa at 22 ?C, Geochim. Cosmochim. Acta, 56, 2673-2680, 1992.
55. Lea, D. W. and Spero, H. J.: Assessing the reliability of pale-ochemical tracers: Barium uptake in the shells of planktonic foraminifera, Paleoceanography, 9, 445-452, 1994. (Pubitemid 24405331)
56. Lea, D. W., Mashiotta, T. A. and Spero, H. J.: Controls on magnesium and strontium uptake in planktonic foraminifera determined by live culturing, Geochim. Cosmochim. Acta, 63, 2369-2379, 1999. (Pubitemid 30031485)
57. Lear, C. H., Rosenthal, Y., and Slowey, N.: Benthic foraminiferal Mg/Ca-paleothermometry: A revised coretop calibration, Geochim. Cosmochim. Acta, 66, 3375-3387, 2002. (Pubitemid 35225039)
58. Levin, L. A., Gutiérrez, D., Rathburn, A., Neira, C., Sellanes, J., Munoz, P., Gallardo, V., and Salamanca, M.: Benthic processes on the Peru margin: a transect across the oxygen minimum zone during the 1997-1998 El-Nino, Prog. Oceanogr., 53, 1-27, 2002. (Pubitemid 34653241)
59. Lutze, G. F.: Variiationsstatistik und Okologie bei rezenten Foraminiferen: Paläontologische Zeitschrift,36, 252-264, 1962.
60. Mallon, J., Glock, N. and Schönfeld, J.: The response of benthic foraminifera to low-oxygen conditions of the Peruvian oxygen minimum zone, in: ANOXIA: Evidence for eukaryote survival and paleontological strategies, Cellular Origin, Life in Extreme Habitats and Astrobiology 21, edited by: Altenbach, A. V., Bern-hard, J. M., and Seckbach, J., Springer Science+Business Media, 305-321, doi:10.1007/978-94-007-1896-8 16, 2011.
61. Marchitto Jr., T. M., Curry, W. B., and Oppo, D. W.: Zinc concentrations in benthic foraminifera reflect seawater chemistry, Pale-oceanography, 15, 299-306, 2000. (Pubitemid 32300491)
62. Marchitto, T. M.: Precise multielemental ratios in small foraminiferal samples determined by sector field ICP-MS, Geochem. Geophys. Geosyst., 7, Q05P13, doi:10.1029/2005GC001018, 2006.
63. Martin, P. A. and Lea, D. W.: Comparison of water mass changes in the deep tropical Atlantic derived from Cd/Ca and carbon isotope records: Implications for changing Ba composition of deep Atlantic water masses, Paleoceanography, 13, 572-585, 1998. (Pubitemid 29199337)
64. Mosch, T., Sommer, S., Dengler, M., Noffke, A., Bohlen, L., Pfannkuche, O., and Wallmann, K.: Structuring forces on epibenthic communities across the Peruvian oxygen minimum zone, Deap Sea Res., in review, 2012.
65. Munsel, D., Kramar, U., Dissard, D., Nehrke, G., Berner, Z., Bijma, J., Reichart, G.-J., and Neumann, T.: Heavy metal incorporation in foraminiferal calcite: results from multi-element enrichment culture experiments with Ammonia tepida, Biogeosciences, 7, 2339-2350, doi:10.5194/bg-7-2339-2010, 2010.
66. Ni, Y., Foster, G. L., Bailey, T., Elliott, T., Schmidt, D. N., Pearson, P., Haley, B., and Coath, C.: A core top assessment of proxies for the ocean carbonate system in surface dwelling Foraminifers, Paleoceanography, 22, PA3212, doi:10.1029/2006PA001337, 2007. (Pubitemid 350201892)
67. Nomaki, H., Heinz, P., Nakatsuka, T., Shimanaga, M., Ohkouchi, N., Ogawa, N. O., Kogure, K., Ikemoto, E., and Kitazato, H.: Different ingestion patterns of 13C-labeled bacteria and algae by deep-sea benthic foraminifera, Mar. Ecol. Prog. Ser., 310, 95-108, 2006.
68. Nürnberg, D.: Magnesium in tests of Neogloboquadrina pachy-derma sinistral from high northern and southern latitudes, J. Foraminiferal Res., 25, 350-368, 1995. (Pubitemid 26463920)
69. Nürnberg, D., Bijma, J., and Hemleben, C.: Assessing the reliability of magnesium in foraminiferal calcite as a proxy for water mass temperatures, Geochim. Cosmochim. Acta, 60, 803-814, 1996.
70. Ohkouchi, N., Kawahata, H., Murayama, M., Ohkada, M., Naka-mura, T., and Taira, A.: Was deep water formed in the North Pacific during the Late Quaternary? Cadmium evidence from the northwest Pacific, Earth Planet. Sc. Lett., 124, 185-194, 1994. (Pubitemid 24405337)
71. Pakhomova, S. V., Hall, P. O. J., Kononets, M. Y., Rozanov, A. G., Tengberg, A., and Vershinin, A. V.: Fluxes of iron and manganese across the sediment-water interface under various redox conditions, Mar. Chem., 107, 319-331, 2007. (Pubitemid 350087478)
72. Palmer, M. R., Pearson, P. N., and Cobb, S. J.: Reconstructing past ocean pH-depth profiles, Science 282, 1468-1471, 1998. (Pubitemid 28538603)
73. Palmer, M. R. and Pearson, P. N.: A 23,000-year record of surface water pH and pCO2 in the western equatorial Pacific Ocean, Science 300, 480-482, 2003. (Pubitemid 36444327)
74. Pearson, P. N. and Palmer, M. R.: Atmospheric carbon dioxide concentrations over the past 60 million years, Nature, 406, 695-699, 2000.
75. Pedersen, T. F., Pickering, M., Vogel, J. S., Southon, J. N., and Nelson, D. E.: The response of benthic foraminifera to productivity cycles in the eastern equatorial Pacific: Faunal and geochemical constraints on glacial bottom water oxygen levels, Paleoceanog-raphy, 3, 157-168, 1988. (Pubitemid 19308512)
76. Pena, L. D., Calvo, E., Cacho, I., Eggins, S., and Pelejero, C.: Identification and removal of Mn-Mg-rich contaminant phases on foraminiferal tests: Implications for Mg/Ca past temperature reconstructions, Geochem. Geophys. Geosyst., 6, Q09P02, doi:10.1029/2005GC000930, 2005.
77. Pena, L. D., Cacho, I., Calvo, E., Pelejero, C., Eg-gins, S., and Sadekov, A.: Characterization of contaminant phases in foraminifera carbonates by electron micro-probe mapping, Geochem. Geophys. Geosyst., 9, Q07012, doi:10.1029/2008GC002018, 2007.
78. Rae, J. W. B., Foster, G. L., Schmitt, D. N., and Elliot, T.: Boron isotopes and B/Ca in benthic foraminifera: Proxies for the deep ocean carbonate system, Earth Planet. Sc. Lett., 302, 403-413, 2011.
79. Reichart, G.-J., Jorissen, Mason, F. P. R. D., and Anschutz, P.: Single foraminiferal test chemistry records the marine environment, Geology, 31, 355-358, 2003. (Pubitemid 36537095)
80. Rollion-Bard, C. and Erez, J.: Intra-shell boron isotope ratios in the symbiont-bearing benthic foraminiferan Amphistegina lobifera: Implications for δ11B vital effects and paleo-pH reconstructions, Geochim. Cosmochim. Acta, 74, 1530-1536, 2010.
81. Rollion-Bard C., Erez J., and Zilberman T.: Intra-shell oxygen isotope ratios in the benthic genus Amphistegina and the influence of seawater carbonate chemistry and temperature on this ratio, Geochim. Cosmochim. Acta, 72, 6006-6014, 2008.
82. Rosenthal, Y., Boyle, E. A., and Slowey, N.: Temperature control on the incorporation of magnesium, strontium, fluorine, and cadmium into benthic foraminiferal shells from Little Bahama Bank: Prospects for thermocline paleoceanography, Geochim. Cosmochim. Acta, 61, 3633-3643, 1997.
83. Russell, A. D., Emerson, S., Nelson, B., Erez, J., and Lea, D. W.: Uranium in foraminiferal calcite as a recorder of seawater uranium concentrations, Geochim. Cosmochim. Acta, 58, 671-681, 1994. (Pubitemid 24423809)
84. Russell, A. D., Hönisch, B., Spero, H. J., and Lea, D. W.: Effects of seawater carbonate ion concentration and temperature on shell U, Mg, and Sr in cultured planktonic foraminifera, Geochim. Cos-mochim. Acta, 68, 4347-4361, 2004. (Pubitemid 39454549)
85. Sadekov, A. Y., Eggins, S. M., and De Deckker, P.: Characterization of Mg/Ca distributions in planktonic foraminifera species by electron microprobe mapping, Geochem. Geophys. Geosyst., 6, Q12P06, doi:10.1029/2005GC000973, 2005.
86. Sano, Y., Shirai, K., Takahata, N., Hirata, T., and Sturchio, N. C.: Nano-SIMS analysis of Mg, Sr, Ba, U in natural calcium carbonate, Anal. Sci., 21, 1091-1097, 2005. (Pubitemid 41554045)
87. Sanyal, A., Hemming, N. G., Hanson, G. N., and Broecker, W.: Evidence for a higher pH in the glacial ocean from boron isotopes in foraminifera, Nature, 373, 234-236, 1995.
88. Sanyal, A., Bijma, J., Spero, H. J., and Lea, D.: Empirical relationship between pH and the boron isotopic composition of Glo-bigerinoides sacculifer: implications for the boron isotope paleo-pH proxy, Paleoceanography, 16, 515-519, 2001. (Pubitemid 33023776)
89. Scholz, F., Hensen, C., Noffke, A., Rhode, A., and Wallmann, K.: Early diagenesis of redox-sensitive trace metals in the Peru up-welling area-response to ENSO-related oxygen fluctuations in the water column, Geochim. Cosmochim. Acta, 22, 7247-7276, 2011.
90. Sen Gupta, B. K., Smith, L. E., and Machain-Castillo, M. L.: Foraminifera of the Gulf of Mexico, in: Gulf of Mexico-Origins, Waters, and Biota, Biodiversity, edited by: Felder D. L. and Camp, D. K., Texas A&M Press, College Station, Texas, 87-129, 2009.
91. Silva, K. A., Corliss, B. H., Rathburn, A. E., and Thunell, R. C.: Seasonality of living benthic foraminifera from the San Pedro Basin, California Borderland, Journal of Foraminiferal Research, 26, 71-93, 1996.
92. Sliter, W. V.: Test ultrastructure of some living benthic foraminifers: Lethaia, 7, 5-16, 1974.
93. Spivack, A. J., You, C.-F., and Smith, H. J.: Foraminiferal boron isotope ratios as a proxy for surface ocean pH over the past 21 Myr, Nature, 363, 149-151, 1993. (Pubitemid 23391825)
94. Strub, T., Meś?as, J., Montecino, V., Rutllant, J., and Salinas, S.: Coastal ocean circulation off western South America, in: The Sea, edited by: Robinson, A. and Brink, K., vol. 11. New York: John Wiley and Sons, Inc., 29-67, 1998.
95. Suits, N. S. and Arthur, M. A.: Sulfur diagenesis and partitioning in Holocene Peru shelf and upper slope sediments, Chem. Geol., 163, 219-234, 2000. (Pubitemid 30119330)
96. Toyofuku, T. and Kitazato, H.: Micromapping of Mg/Ca values in cultured specimens of the high-magnesium ben-thic foraminifera, Geochem. Geophys. Geosyst., 6, Q11P05, doi:10.1029/2005GC000961, 2005.
97. Wu, G. and Hillaire-Marcel, C.: Application of LP-ICP-MS to benthic foraminifers, Geochim. Cosmochim. Acta, 59, 409-414, doi:10.1016/0016-7037(94) 00370-2, 1995.
98. Yu, J., Day, J., Greaves, M., and Elderfield, H.: Determination of multiple element/calcium ratios in foraminiferal calcite by quadrupole ICP-MS, Geochem. Geophys. Geosyst., 6, Q08P01, doi:10.1029/2005GC000964, 2005.
99. Yu, J., Elderfield, H., Greaves, M., and Day, J.: Preferential dissolution of benthic foraminiferal calcite during laboratory reductive cleaning, Geochem. Geophys. Geosyst., 8, 17, doi:10.1029/2006GC001571, 2007.
100. Yu, J., Elderfield, H., Jin, Z., and Booth, L.: A strong temperature effect on U/Ca in planktonic foraminiferal carbonates, Geochim. Cosmochim. Acta, 72, 4988-5000, 2008.