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GSA Annual Meeting in Phoenix, Arizona, USA - 2019

Paper No. 297-8
Presentation Time: 3:15 PM

A NEW SURFACE WATER PALEOTEMPERATURE PROXY: APPLYING BRILLOUIN THERMOMETRY TO RECONSTRUCT TEMPERATURES OF PLEISTOCENE SEARLES LAKE


OLSON, Kristian J.1, GUILLERM, Emmanuel2, GARDIEN, Véronique2, CAUPIN, Frédéric3, LOWENSTEIN, Tim K.4, PEAPLE, Mark D.5, FEAKINS, Sarah J.6, TIERNEY, Jessica7, MCGEE, David8, STROUP, Justin9, JANICK, Joseph J.10 and BRUSH, Jade Ashley11, (1)Department of Geological Sciences and Environmental Sciences, Binghamton University, Science 1, Room 261, Binghamton, NY 13902, (2)Laboratoire de Géologie de Lyon, Université Claude Bernard, Lyon1, Campus de la Doua, bâtiment Géode, 2, rue Raphaël Dubois, Villeurbanne Cedex, 69622, France, (3)Département de Physique de la Faculté des Sciences et Technologies, Université Claude Bernard, Lyon1, Domaine Scientifique de la Doua, 43, Bld du 11 novembre, Villeurbanne Cedex, 69622, France, (4)Department of Geological Sciences and Environmental Studies, Binghamton University, Binghamton, NY 13902, (5)Earth Sciences, University of Southern California, 3651 Trousdale Pkwy, LOS ANGELES, CA 90089, (6)Earth Sciences, University of Southern California, 3501 Trousdale Pkwy, Los Angeles, CA 90889-0740, (7)Geosciences, University of Arizona, Tucson, AZ 85721, (8)Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, (9)Atmospheric and Geological Sciences, State University of New York at Oswego, Oswego, NY 13126, (10)La Plume, PA 18440, (11)Searles Valley Minerals, 13200 Main St, Trona, CA 93562

Brillouin Spectroscopy can be used to measure the physical properties of brines trapped within halite inclusions. These data can be further used to derive the temperature of the brines at the time of their entrapment. We have applied this approach to halite from a new drill core, SLAPP-SRLS17, retrieved in 2017 from Searles Lake, California. Results of Brillouin Thermometric measurements in halite from Searles Lake reflect mean annual bottom-water temperatures ranging from 11.4 +/- 0.7°C to 23.9 +/- 0.7°C. Additionally, the thermal stability of the hypolimnion was assessed by measuring several halite crystals from stratigraphic intervals of ~3-5 cm. Small intra-stratigraphic temperature variability of 0-2°C indicates a stable hypolimnion with estimated lake depths of ~20-50 m, whereas 3-5°C variability suggests shallower lake depths (~10 m), where the temperature fluctuations depend on water clarity and light penetration. Brillouin Thermometry results from Searles Lake are in general agreement with biochemical temperature proxies analyzed from the SLAPP-SRLS17 sediment core. These results demonstrate the strength and viability of Brillouin Thermometry as a novel proxy for paleotemperature.

Session No. 297

T128. Lakes of the World through Time and Space II
Wednesday, 25 September 2019: 1:30 PM-5:30 PM
Room 222BC, North Building (Phoenix Convention Center)
Geological Society of America Abstracts with Programs. Vol. 51, No. 5
doi: 10.1130/abs/2019AM-339071
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