Stable Isotope Laboratory
Housed in the Department of Geology and Environmental Geosciences, Stable Isotope Laboratory (SIL), is dedicated to academic research conducted at NIU but also collaborates with other Universities and Industrial clients.
Our laboratory is equipped with two isotope-ratio mass spectrometers, and various peripheral and sample preparation analytical devices. Isotope ratio mass spectrometry (IRMS) allows for measurements of the stable isotope ratios of light elements such as hydrogen, carbon, nitrogen, oxygen, sulfur, silicon at the natural abundance level in a broad range of samples. These isotope data are employed in the fields of geology, geochemistry, hydrology, paleoclimate research, and ecology. Research problems to which our data contribute include developing records of past environmental change in terrestrial and marine environments, past climate and water availability in the Atacama desert (northern Chile), assessing the water recharge in Pampa del Tamarugal Basin (Atacama Desert), isotope geochemistry and paleolimnology in western North America, Central America and South America, investigating the proglacial lake sediment stratigraphy in the tropical Andes, glacier mass-balance modeling, and high latitude climate and carbon dynamics. Stable isotopes are also used in tracing seabird-derived nutrients in terrestrial and nearshore island communities, where isotopes are used to track the response of seabirds to invasive mammal eradication, quantification of diet in mammals (bison, coyote) at Nachusa grasslands, as well as the niche breadth of small mammals.
Current Research Projects in the Stable Isotope Lab include:
Elizabeth Olson (Ph.D. Student, Dodd) – Oxygen and carbon isotope analyses of Prosopis tamarugo tree-ring alpha-cellulose from the Atacama Desert to examine Holocene climate, water availability, and landscape evolution
Wilson Wiedenheft (M.S., Dodd) – Oxygen isotope analyses in biogenic silica (particularly diatoms) during silica dissolution/precipitation
Hal Hackett (M.S., Dodd) – Oxygen isotope variations in Pliocene diatom silica from the Antarctic marine (AND-1B) core
Vito Valerio (M.S., Dodd) – Oxygen and carbon isotope systematics of modern Prosopis tamarugo tree-ring alpha-cellulose from the Atacama Desert to calibrate modern tree and meteorological data
Stephanie Kong (M.S., Jones) – C and N isotope variations in soil, vegetation, and arachnids from New Zealand to characterize food web dynamics
Tirzah Abbott (M.S., Dodd) – Oxygen and silicon isotope variations in biogenic and low temperature opal during transition from Opal-A to Opal-CT
Audrina Pryer (M.S., Dodd) – The effects trace elemental variations on oxygen and silicon isotope fractionation in low temperature opal
Carolyn Fortney (M.S., Stansell) – Oxygen and carbon isotope variations in authigenic carbonates from Estonian lakes as paleoclimate proxies
Please contact Anna Buczynska for analytical requests, pricing, project information, or student/research opportunities.