Erin Todd, Ph.D.
Igneous petrology and isotope geochemistry, with particular emphasis on the origin and evolution of melts associated with subduction zones.
Biography
Education
Ph.D. 2011 University of California, Santa Cruz, CA Earth Sciences
M.S. 2005 Northern Arizona University, Flagstaff, AZ Geology
B.S. 1999 University of Florida, Gainesville, FL Geology
Professional Experience
2012 - Present Research Geologist, USGS Alaska Science Center, Anchorage, Alaska
2011 - 2012 Postdoctoral Research Associate, WWU - University of Münster
2005 - 2011 Research and Teaching Assistant, University of California, Santa Cruz, CA
Professional Activities and/or Memberships
American Geophysical Union
Geochemical Society
Geological Society of America
InterRIDGE
Science and Products
Metallogeny and Tectonics of the Lake Clark and Neacola Mountains Region, South-central Alaska
Alaska hosts a well-documented belt of ore deposits that lies roughly parallel to the Alaska Range, beginning at the Alaska Peninsula in the southwest, continuing up through the Fairbanks Mining District in the north, and curving back into the Tintina Gold Belt on its eastern end. Known mineral prospects and occurrences include porphyry copper, intrusion-related gold, volcanogenic massive...
Sr, Nd, Hf and Pb isotope geochemistry of Early Miocene shoshonitic lavas from the South Fiji Basin: Note
We present new Sr, Nd, Hf and Pb isotope data for Early Miocene shoshonitic and high-K lavas dredged from seamounts in the South Fiji Basin, southwest Pacific Ocean. Our analyses provide a useful reference dataset for this distinctive compositional suite. The shoshonitic lavas formed in an intra-oceanic back-arc basin setting and are broadly...
Mortimer, Nick; Bosch, Delphine; Laporte-Magoni, Christine; Todd, Erin; Gill, James B Cretaceous to Oligocene magmatic and tectonic evolution of the western Alaska Range: insights from U-Pb and 40Ar/39Ar geochronology
New U-Pb and 40Ar/39Ar ages integrated with geologic mapping and observations across the western Alaska Range constrain the distribution and tectonic setting of Cretaceous to Oligocene magmatism along an evolving accretionary plate margin in south-central Alaska. These rocks were emplaced across basement domains that include Neoproterozoic to...
Jones, James V.; Todd, Erin; Box, Stephen E.; Haeussler, Peter; Holm-Denoma, Christopher; Karl, Susan M.; Graham, Garth E.; Bradley, Dwight C.; Kylander-Clark, Andrew R.C.; Friedman, Richard M.; Layer, Paul W. Links between tectonics, magmatism, and mineralization in the formation of Late Cretaceous porphyry systems in the Yukon-Tanana upland, eastern Alaska, USA
Cretaceous-Paleocene porphyry Cu(±Mo±Au) occurrences are scattered throughout the Yukon-Tanana upland in eastern Alaska. Known occurrences in eastern Alaska are poorly characterized, despite a resurgence in exploration. Porphyry deposits in the upland are emplaced into structurally complex metamorphic rocks representing a variety of tectonic...
Kreiner, Douglas; Jones, James V.; Todd, Erin; Holm-Denoma, Christopher; Caine, Jonathan; Benowitz, Jeff U-Pb and Lu-Hf isotope, age, and trace-element data from zircons at four sites in the western Alaska Range and Talkeetna Mountains, Alaska
This Division of Geological & Geophysical Surveys (DGGS) Raw Data File presents U-Pb geochronology and Lu-Hf isotopic compositions, age-dating results, and additional trace-elemental composition of zircons from four granitoids sampled during investigations by DGGS geologists in the western Alaska Range and the Talkeetna Mountains. The purpose...
Todd, Erin; Kylander-Clark, Andrew R. C. ; Wypych, Alicja; Twelker, Evan; Sicard, Karri R. Copahue volcano and its regional magmatic setting
Copahue volcano (Province of Neuquen, Argentina) has produced lavas and strombolian deposits over several 100,000s of years, building a rounded volcano with a 3 km elevation. The products are mainly basaltic andesites, with the 2000–2012 eruptive products the most mafic. The geochemistry of Copahue products is compared with those of the...
Varekamp, J. C.; Zareski, J. E.; Camfield, L. M.; Todd, Erin
GIS-Based Identification of Areas with Mineral Resource Potential for Six Selected Deposit Groups, Bureau of Land Management Central Yukon Planning Area, Alaska
This study, covering the Bureau of Land Management (BLM) Central Yukon Planning Area (CYPA), Alaska, was prepared to aid BLM mineral resource management planning. Estimated mineral resource potential and certainty are mapped for six selected mineral deposit groups: (1) rare earth element (REE) deposits associated with peralkaline to carbonatitic...
Jones, James V.; Karl, Susan M.; Labay, Keith A.; Shew, Nora B.; Granitto, Matthew; Hayes, Timothy S.; Mauk, Jeffrey L.; Schmidt, Jeanine M.; Todd, Erin; Wang, Bronwen; Werdon, Melanie B.; Yager, Douglas B. Effects of simple acid leaching of crushed and powdered geological materials on high-precision Pb isotope analyses
We present new results of simple acid leaching experiments on the Pb isotope composition of USGS standard reference material powders and on ocean island basalt whole rock splits and powders. Rock samples were leached with cold 6 N HCl in an ultrasonic bath, then on a hot plate, and washed with ultrapure H2O before sample digestion in HF‐...
Todd, Erin; Stracke, Andreas; Scherer, Erik