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My Research -
Sandra Passchier
Over the past 17 years my research has primarily focused on sediments recording the role of the Earth's cryosphere in long-term global climate change. My students, colleagues and I have worked on Cenozoic glacial and coastal sediment records in Antarctica, Greenland, and the North Sea basin and the lithified glacial rocks of the Neoproterozoic Squantum "Tillite" in the Boston basin. We use sedimentary facies analyses from visual outcrop, core descriptions, and acoustic data in combination with physical and chemical laboratory methods to reconstruct sedimentary paleoenvironments, sediment dispersal paths, paleoweathering signals, and ice-sheet extent. My niche is the study of sediments sourced from former or present ice centers to provide constraints for the interpretation of far-field records of cryospheric change, such as sequence stratigraphic and isotope proxies. I have completed 4 trips to Antarctica and I am scheduled to go on another one in 2010. I have also completed a dozen shipboard cruises in the North Sea, working on sediment dynamics and habitat characteristics of a shallow siliciclastic shelf. Present and future research projects: -Early and Middle Miocene and Eocene glacial history of Antarctica, IODP Exp. 318 cores and Antarctic Drilling Program (ANDRILL SMS) -Field logging and bulk geochemistry of Snowball Earth rocks in the Boston Basin Examples of previous projects are: - Neogene stratigraphy of the North Sea basin: mapping based on seismic data and core descriptions - Ecomorphodynamics of the North Sea floor - Ocean Drilling Program Leg 188: Antarctic Ice-sheet inception and the Prydz trough mouth fan from particle-size, well-log and SEM analyses - Sedimentary petrography and geochemistry of the Sirius Group, Transantarctic Mountains, Antarctica - Cape Roberts Drilling project, Ross Sea, Antarctica: Eocene-Miocene Antarctic ice sheet history - Greenland ice margin experiment: Holocene deglaciation history using mapping and radiocarbon dating Selected recent publications: Stickley, C.E., St John, K.E., Koç, N., Jordan, R.W., Passchier, S., Pearce, R.B., Kearns, L.E., 2009. Evidence for middle Eocene Arctic sea ice from diatoms and ice-rafted debris. Nature, 460, 376-379. Siegert, M.J., Barrett, P., DeConto, R., Dunbar, R., Ó Cofaigh, C., Passchier, S., Naish, T., 2008. Recent advances in understanding Antarctic climate evolution. Antarctic Science, 20 (4), 313-325. doi:10.1017/S0954102008000941 Passchier, S., Krissek, L.A., 2008. Oligocene–Miocene Antarctic continental weathering record and paleoclimatic implications, Cape Roberts drilling Project, Ross Sea, Antarctica, Palaeogeography, Palaeoclimatology, Palaeoecology, 260, 30-40. Passchier, S., 2007. East Antarctic ice-sheet dynamics between 5.2 and 0 Ma from a high-resolution terrigenous particle size record, ODP Site 1165, Prydz Bay-Cooperation Sea. In: A.K.Cooper and C.R. Raymond et al. (eds.), Antarctica: A Keystone in a Changing World – Online Proceedings of the 10th ISAES, USGS Open-File Report 2007-1047, Short Research Paper 043, 4 p.; doi:103133/of2007-1047.srp043. Passchier, S., Whitehead, J.M., 2006. Anomalous geochemical provenance and weathering history of Plio-Pleistocene glaciomarine fjord strata, Bardin Bluffs Formation, East Antarctica. Sedimentology, 53, 929-942. Passchier, S., Kleinhans, M.G., 2005. Observations of sand waves, megaripples and hummocks in the Dutch coastal area and their relation to currents and combined flow conditions. Journal of Geophysical Research, 110, F04S15. |
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