Source: http://www.latishabrengman.com/
Timestamp: 2019-04-19 22:49:08+00:00

Document:
I am a geoscientist and Assistant Professor in the Department of Earth and Environmental Sciences at the University of Minnesota - Duluth, where I teach Earth History , Geochemistry, and Geobiology (co-taught with Biology Department).
My work is concerned with the the geochemical conditions of Earth’s early oceans, enabling us to better understand how life on earth originated, radiated, and diversified.
I am interested in deciphering early Earth problems relevant to nascent life.
At present, much of the work in my lab revolves around the genesis of Precambrian volcanic and sedimentary rocks. Of particular interest is an extinct rock known as “iron formation”, or “IF” for short. These chemical sedimentary rocks form between >3.7 and ~1.8 billion years ago, at a time when most of the ocean is thought to have been without free oxygen.
Because they are formed in the ocean, IF are unique in that they can provide information about what the ocean was like in the distant past. By studying element cycling in the early ocean as it relates to the evolution of the crust-ocean system, we can better determine the conditions under which early life evolved.
Working predominantly in the Precambrian Eon (4600 – 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.
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.
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). Micro‐scale 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., (2018). Development of a mixed seawater-hydrothermal fluid geochemical signature during alteration of volcanic rocks in the Archean (∼2.7 Ga) Abitibi Greenstone Belt, Canada. Geochimica et Cosmochimica Acta 227: 227-245.
Banded "slaty" unit from the ~1.9 Ga Biwabik Iron Formation.
Entry point to Soudan Underground Mine (~2.7 Ga Iron Formation, MN).
5x, cross-polarized light image with the gypsum plate in. Width of image ~2.5 mm.
2.5x, cross-polarized light image. Granules (ovoid shapes) ~2 mm each.
Central crystal ~ 2 mm.

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