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June, 2012

Amanda Duchesne, Daniel Johnson, and Marissa Wright have joined the AGES lab as summer interns! They are studying argon concentrations and neodymium isotopes in fine-grained marine sediments from various locations off-shore of Antarctica with the goal of better understanding sediment provenance.

Elizabeth Pierce and Sidney Hemming are presenting the following at the 2012 Goldschmidt Conference in Montreal:

Hemming, S. R., 2012, The geochemical signal of the provenance of ice-rafted deposits and ice sheet dynamics.

Hemming, S. R., Heizler, M. T., Jicha, B., Machlus, M., Rasbury, E. T., Renne, P. R., Singer, B. S., Swisher, C. C., III, and Turrin, B. D., 2012, Inter-laboratory Evaluation of 40Ar/39Ar Data for Sanidines from the Fire Clay Tonstein

Pierce, E.L., van de Flierdt, T., Hemming, S.R., Williams, T., Cook, C.C., and Expedition 318 Scientists (2012): Evolution of the East Antarctic Ice sheet during the Mid-Miocene Climate Transition from ice-rafted detritus provenance studies.


October, 2011

Joel Gombiner, a recent Columbia College Graduate (CC’11) has returned to work as a research staff assistant in the AGES lab.  Joel has been a part of the AGES lab since his freshman year in college, and spent last year working on K-Ar dating of fine-grained sediments to determine the provenance of the Missoula Flood deposits.

Guleed Ali, Marissa Tremblay, and Sidney Hemming attended the GSA conference in Minneapolis, MN, and presented on the following abstracts:

Ali, GAH; Hemming, SR; Wang, X; Zimmerman SH; (2009), Using GIS-based Estimates of Paleovolume: Implications for Mono Lake Deglacial Hydroclimate, Geologic Society of America Annual Meeting 2011.

Hemming, S.R., Zimmerman, S.H., Wang, X., Hemming, N.G. (2011) Survey of thinolitic tufa towers in the Mono Basin, California, USA

Tremblay, M., Christie-Blick, N., and Hemming, S.R. (2011) Late Miocene tilting of the Resting Spring Range, CA


Additional abstracts from GSA with the AGES group:

Sahajpal, R., Hemming, N.G., Hemming, S.R., Rouff, A.A., and Zimmerman, S.H., (2011) Geochemical Modeling of Mineral Stability during evaporation and mixing of waters in the Mono Basin, California, USA.

Zimmerman, SH, Hemming, SR., Ali G.A.H., Hemming, N.G., Wang, X., and Stine, S. (2011) Holocene sedimentation patters and volcanic history from bingo expedition sediment core, Mono Lake, California, USA.

Wang, X., Hemming, S.R., Zimmerman, S.H., Hemming, N.G., and Ali G.A.H. (2011) A U/Th based deglacial hydroclimate history in the Mono Basin, USA.

Colman, S., Hemming, S.R., Stine, S., Hemming, N.G., Liu X., (2011) Chirp seismic-reflection profiles from Mono Lake: the effect of volcanic eruptions on lacustrine stratigraphy.

Oliver, B.P., Barbeau, D.L. Jr, Hemming S.R., (2011) Proposed research: does the sediment mass balance of the Larsen Basin, Antarctic Peninsula, Support Ephemeral Cretaceous Glaciation?


September, 2011

Gary Mesko, a Columbia College graduate (CC’09) and former research staff assistant in the AGES lab has started as a PhD student in the Department of Earth and Environmental Sciences at Columbia University.  Gary’s PhD work will keep him around the AGES Lab, as he will still be working on dating young volcanic rocks (this time from East Africa) with the 40Ar/39Ar method.

Graduate student Elizabeth Pierce’s paper on “Characterizing the sediment provenance of East Antarctica’s weak underbelly: the Wilkes and Aurora sub-glacial basins” was accepted to the journal Paleoceanography.


August, 2011

Tiffany May has finished her time with us for this summer, just in time to return to her highschool for the start of a new school year. She has became a pro at sample processing (check out her video on YouTube!) and will be returning next June for more lab work and some fieldwork out west. We are looking forward to her return!

Sidney Hemming attended the Geochemical Society’s annual Goldschmidt Conference in Prague, and presented on the following abstract:

Hemming, S.R., Tsukui, K., Mesko, G.T., Ali, G.A.H., Cai, Y., Adler, A., Campbell, S., Crapster-Pregnot, E., Doherty, C. Gombiner, J., Russell, J., Templeton, J., Tremblay, M., Vankeuren, M. (2011) Intercalibration of Ar-Ar standards and samples at L-DEO.


Additional abstracts from Goldshmidt with the AGES group:

Chang, S.C., Zhang, H., Hemming, S.R., Mesko, G.T. and Fang, Y. (2011) High-precision age for the Haifanggou Formation and its implications for the coevolution of plants and atmospheric CO2.

Cook, C., van de Flierdt, T., Hemming, S.R., WIlliams, T., PIerce, E.L. (2011) Dynamics of the Pliocene East Antarctic ice shee revelaed by isotopes in marine sediments, Goldschmidt 2011, Prauge.


July, 2011

Guleed Ali and Sidney Hemming attended the INQUA (International Union for Quaternary Research) Meeting in Bern, Switzerland, where they presented the following abstracts:

Ali, G.A.H; Cox, S.; Hemming, S.; Steponaitis, E.; Zimmerman, S.; Wang, X.;Two-step heating experiments on individual sanidine crystals from Ash 4 of the Wilson Creek Formation, Mono Basin, California, USA. Abstract 3061. (2011) Bern, Switzerland

Elizabeth Pierce attended the International Symposium on Antarctic Earth Sciences in Edinburgh, Scotland, and presented on the following abstract:

Pierce, E.L., van de Flierdt, T., Hemming, S.R., Williams, T., Cook, C.C., and Expedition 318 Scientists (2011): Sedimentary Insights to the Mid-Miocene Climate Transition from IODP Site U1356A. 11th International Symposium of Antarctic Earth Sciences.


Additional abstracts at ISAES with the AGES group:

Van de Flierdt, T., Kim, S., Cook, C., Hemming, S., Williams, T., Pierce, E.L., Passchier, S., Jimenez-Espejo, F., Rol, U., Bohaty, S.M., Tauxe, L., and Expedition 318 Scientists (2011): The Fingerprint of the First Oligocene Ice-Rafted Debris Around East Antarctica – Lessons to be Learned about the Initial Expansion of the Antarctic Ice Sheet. ISAES Abstract.

Cook, C., van de Flierdt, T., Williams, T., Hemming, S., Pierce, E.L., and Expedition 318 Scientists (2011): The Evolution of the Pliocene East Antarctic Ice Sheet Revealed By Detrital Marine Sediment Provenance Studies. ISAES Abstract.

Cook, C., van de Flierdt, T., Williams, T., Hemming, S., Pierce, E.L., and Expedition 318Scientists (2011): Ice Sheet Stability in the Vicinity of the Wilkes Subglacial Basin DuringThe Pliocene. ISAES Abstract

Williams, T., Hemming, S., van de Flierdt, T., Brachfeld, S., Pierce, E.L., Dale, C., Cook, C.,Goldstein, S.L., Roy, M. (2011): Isotope geochemistry of circum-Antarctic marine core tops for sub-glacial geology and sediment provenance. ISAES Abstract.

Brachfeld, S.A., Cuomo, D., van de Flierdt, T., Hemming, S.R., Dale, C., Goldstein, S.L., Pierce, E.L., Williams, T. (2011): Iron oxide geochemistry and texture as a tracer of  Antarctic sediment provenance. ISAES Abstract. 


June, 2011

Tiffany May, a highschool Earth Science Teacher from Brooklyn, NY has just joined the AGES lab group as a member of The Columbia Summer Research Program for Science Teachers (http://www.scienceteacherprogram.org/).  Tiffany will be working on projects involving Antarctic geology and climate, as well as project working on the Eocene sediments in the Green River Formation, WY. 

Karen Benedetto has joined the AGES group as a research staff assistant, and has quickly taken over the mineral processing lab, and is overseeing the sample crushing and density and magnetic separations that we routinely perform.  AGES is very luck to have her as a part of the group!

Sidney Hemming, Graduate Student Elizabeth Pierce and undergaduate student Adam Formica headed to the University of Arizona for the two week shortcourse ANTARCTICHRON- run by Pete Reiners, Stuart Thompson and Sidney Hemming. The goal of the shortcourse was to learn about U-Pb dating of zircons and apatites, Fission Track dating on zircons and apatites, and U-Th/He dating on zircons and apatites. All of the students present were working on aspects of Antarctic Geology, and using geochrnology and lower temperature thermochronology to answer questions pertaining to landscape evolution, erosiona rates and sub-glacial geology.


October, 2010

The following abstracts have been accepted and will be presented at the 2010 AGU Fall meeting. If you would like to see the posters or oral presentations refer to the meeting program to plan your itinerary. See you in San Francisco!

S. Chang; H. Zhang; S. R. Hemming; G. T. Mesko; Y. Fang (2010), 40Ar/39Ar dating of the Honghuaqiao Formation in SE China, Eos Trans. AGU, 91(52), Fall Meet. Suppl., Abstract V31A-2305. [pdf]

S.E. Cox; S. R. Hemming; B. D. Turrin; C. C. Swisher (2010), Nonlinearity of Argon Isotope Measurements for Samples of Different Sizes, Eos Trans. AGU, 91(52), Fall Meet. Suppl., Abstract V31A-2301. [pdf]

E.M. Dahlhauser; E. L. Pierce; S. R. Hemming; T. Williams; E. A. Steponaitis; S. A. Brachfeld (2010), Ar-Ar Age Distributions of Glacially Derived Hornblende Grains in the Eastern Weddell Sea, Eos Trans. AGU, 91(52), Fall Meet. Suppl., Abstract C43C-0554. [pdf]

J. Gombiner; I. L. Hendy; S. R. Hemming; M. Q. Fleisher; E. Pierce; G. Mesko; C. L. Dale (2010), Spatial and temporal variation of the last ice age mega-floods in the Pacific Northwest: Sediment provenance using single-aliquot K/Ar dating, Eos Trans. AGU, 91(52), Fall Meet. Suppl., Abstract PP21A-1663. [pdf]

S.R. Hemming; B. D. Turrin; C. C. Swisher; S. E. Cox; G. T. Mesko; S. Chang, (2010), Inter-monitor standard calibration and tests for Ar-Ar biases, Eos Trans. AGU, 91(52), Fall Meet. Suppl., Abstract V23C-02. [pdf]

M. Mabson; E. L. Pierce; C. L. Dale; T. Williams; S. R. Hemming; T. van de Flierdt; C. Cook; S. L. Goldstein, (2010), Variations in the Nd isotope composition of Late Miocene to Early Pliocene glacially derived sediments in Prydz Bay, East Antarctica, Eos Trans. AGU, 91(52), Fall Meet. Suppl., Abstract PP13D-1551.[pdf]

G.T. Mesko; S. Song; S. Chang; S. R. Hemming; B. D. Turrin (2010), Toward a high-resolution 40Ar/39Ar geochronology of the Tatun Volcano Group, Taiwan, Eos Trans. AGU, 91(52), Fall Meet. Suppl., Abstract V31A-2306. [pdf]

E.L. Pierce; T. Williams; T. van de Flierdt; S. R. Hemming; S. A. Brachfeld; S. L. Goldstein (2010), Marine sedimentary provenance evidence for massive discharges of icebergs from the Aurora and Wilkes sub-glacial basins, Eos Trans. AGU, 91(52), Fall Meet. Suppl., Abstract C43C-0562. [[pdf]

B.D.Turrin; C. C. Swisher; A. Deino; S. R. Hemming; K. Hodges; P. R. Renne (2010), "Smoking From The Same Pipe": Development of an 40Ar/39Ar Dating Intercalibration Pipette System, Eos Trans. AGU, 91(52), Fall Meet. Suppl., Abstract V23C-04. [pdf]


August, 2010

Ethan Dahlhauser (Iowa State), Michell Mabson (Howard University) and Joel Gombiner (Columbia Collgege) each presented posters today on the results of their summer research. Today is officially the last day of the Internship Program at Columbia. Below are the titles and PDFs of their posters:

Ehan Dahlhauser: Characterization of glacially derived sediments in the Eastern Wedell Sea: 40Ar/39Ar age distributions of hornblende grains (poster)

Michelle Mabson: Variations in the 143Nd/144Nd ratio of Early Pliocene to Late Miocene glacially derived sediments in Prydz Bay, East Antarctica (poster)

Joel Gombinier: Spatial and temporal variations of Ice Age Megafloods in the Pacific Northwest (poster)


July 2010

Guleed Ali (University of Arizona'09) will be joining othe AGESs group in the Fall, starting as a graduate student in the Department of Earth and Environmental Sciences. (July 2010)

Stephen Cox (Columbia '09 and Research Staff Assistant) has moved on to CALTech where he will be starting graduate school in the Fall. (July 2010)