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Research Areas
Working predominantly in the Precambrian Eon (4600 ā 541 million years ago), my research draws from a variety of disciplines including sedimentology, stratigraphy, geochemistry, and petrology to focus on questions relating to early Earth processes. To date, my research involves both field and laboratory work, and seeks to determine and test hypotheses related to Precambrian earth-system evolution.
Controls on quartz precipitation mechanisms and isotope fractionation during diagenesis of Precambrian chemical sedimentary rocks like IF are not well constrained. Learn more
As chemical sedimentary rocks, the primary minerals in BIF are thought to precipitate from seawater, and, if identified, may provide insight into geochemical conditions of Earthās early oceans where nascent life is hypothesized to have first evolved. Learn more
Lab News
April 13, 2018
We are happy to have graduate student Jackie Drazan join the lab this year! Jackie’s project involves silicon and oxygen isotope geochemistry of silicified volcanic rocks and associated exhalite…
November 11, 2016
Undergraduate Earth and Environmental Sciences major Stephen Hanson has been working since January 2016 to characterize the mineralogy and textures of several samples of ~1.9 Ga chemical sedimentary r…
October 10, 2016
Fall 2016: Looking for data for student projects / grants to apply for? Check these links out
https://earthdata.nasa.gov/ https://earthdata.nasa.gov/earth-observation-data http://www.earthcube.org/info/about http://www.cubesat.org/http://fc.umn.edu/ http://www.nasa.gov/offices/education/progra…
September 22, 2016
Interested in undergraduate research?
Apply for a UROP! Deadline October 10, 2016
Projects
At present, projects in my lab focus on investigating the Precambrian silica cycle as it relates to the evolution of the crust-ocean system, when early microbial life radiated and evolved.
Publications
Brengman, L. A., Fedo, C.M. (2012). Origin of BIF-like jaspilite in the 2.72 Ga Hunter Mine Group, Abitibi Greenstone Belt, Quebec by metasomatic replacement of felsic volcanic rocks. Geological Society of America, Abstracts with Programs, Annual Meeting, Charlotte, N.C., v. 45, n. 7, p. 627.
Brengman, L. A., Fedo, C. M., Whitehouse, M. J. (2013). Silicon isotope composition of Archean cherts from >3.7 Ga to 2.7 Ga determined by Secondary Ion Mass Spectrometry (SIMS). Geological Society of America, Abstracts with Programs, Annual Meeting, Charlotte, N.C., v. 44, n. 7, p. 36.
Prentice, A., Jabeen, I, Webb, E., Banerjee, N., Ali, A., Brengman, L., Fedo, C. (2014). Dual Si and O Measurements Using IRMS-BrF5 Fluorination. Goldschmidt Conference, Sacramento, C.A., p. 1988.
Fedo, C. M., Brengman, L. A., (2014) Revisiting the stratigraphic setting of the ~3 Ga Buhwa Greenstone Belt, Zimbabwe. Geological Society of America, Abstracts with Programs, Annual Meeting, Vancouver, BC, v. 46, n. 6, p. 221.
Brengman, L. A., Fedo, C. M., Whitehouse, M. J. (2014) From source to sink: silicon isotope composition of bedrock, detrital quartz arenites, and siliceous precipitates from the ~3 Ga Buhwa Greenstone Belt, Zimbabwe. Geological Society of America, Abstracts with Programs, Annual Meeting, Vancouver, BC, v. 46, n. 6, p. 221.
Brengman, L.A., Fedo, C. M., Whitehouse, M. J. (2015) Micro-scale silicon isotope heterogeneity observed in hydrothermal quartz precipitates from the >3.7 Ga Isua Greenstone Belt, SW Greenland. Geological Society of America, Abstracts with Programs, Annual Meeting, Baltimore, MD, v. 47, n. 7, p.786.
Brengman, L.A., Larson, P., Hanson, S. (2016) A textural and mineralogical investigation of early diagenetic reactions in the ~1.88 Ga Biwabik iron formation, MN. Geological Society of America, Abstracts with Programs. v. 48, n. 7.
Brengman, L.A., Fedo, C. M., and Whitehouse, M. J., (2016). Microāscale silicon isotope heterogeneity observed in hydrothermal quartz precipitates from the> 3.7 Ga Isua Greenstone Belt, SW Greenland. Terra Nova 28.1: 70-75.
Brengman L. A., Heins W.A., Matthews J.A., (2016). Dissolution and Transformation of Provenance Lithotypes during Initial Sediment Generation with Application to Play-Element Prediction. ExxonMobil Upstream Research Company Research Application Report URC.2016.046, 136 p.
Brengman, L. A., Fedo, C. M., (in review, Geochimica et Cosmochimica Acta). Development of a seawater-like geochemical signature by progressive alteration of volcanic rocks in the Archean (~2.7Ga) Abitibi Greenstone Belt, Canada.
Department of Earth and Environmental Sciences
1114 Kirby Drive, 221 Heller Hall
Duluth, MN 55812
© 2018 Latisha Brengman.
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