USGS researcher collecting samples in Kanuti, Alaska. The samples collected in this location were more resistant to weathering than the surrounding rock indicating a change in lithology.
Erin Todd, Ph.D.
Igneous petrology and isotope geochemistry, with particular emphasis on the origin and evolution of melts associated with subduction zones.
Science and Products
Understanding PGE, Cr, Ni and Cu Potential in Ophiolitic Rocks in Alaska
Ophiolites are sections of oceanic lithosphere that have been structurally emplaced onto continental crust. The ultramafic components of some ophiolites contain podiform chromitites, an important potential source of several strategic and critical minerals, including chromium and platinum group elements (PGE). Yet the tectonics and petrogenesis of several Alaskan ophiolites is poorly understood...
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 sulfides...
Sample Collection, Kanuti, Alaska
USGS researcher collecting samples in Kanuti, Alaska. The samples collected in this location were more resistant to weathering than the surrounding rock indicating a change in lithology.
Recording observations on the outcrop of the Kanuti Ophiolite
USGS researcher making observations and recording information on the outcrop of the Kanuti Ophiolite in Alaska. The Kanuti ophiolite is a mafic-ultramafic thrust sheet of probable Jurassic age, formerly considered to be the upper part of the Yukon-Koyukuk ophiolite (Angayucham terrane).
USGS researcher making observations and recording information on the outcrop of the Kanuti Ophiolite in Alaska. The Kanuti ophiolite is a mafic-ultramafic thrust sheet of probable Jurassic age, formerly considered to be the upper part of the Yukon-Koyukuk ophiolite (Angayucham terrane).
Leave no stone unturned
USGS researcher collecting one more sample while waiting for the helicopter in Kanuti, Alaska. The Kanuti ophiolite is a mafic-ultramafic thrust sheet of probable Jurassic age, formerly considered to be the upper part of the Yukon-Koyukuk ophiolite (Angayucham terrane).
USGS researcher collecting one more sample while waiting for the helicopter in Kanuti, Alaska. The Kanuti ophiolite is a mafic-ultramafic thrust sheet of probable Jurassic age, formerly considered to be the upper part of the Yukon-Koyukuk ophiolite (Angayucham terrane).
Variation of weathering on rock surface
Variation of weathering and lichen growth on the rock surface reveals veins and segregated zones with different mineralogy.
Variation of weathering and lichen growth on the rock surface reveals veins and segregated zones with different mineralogy.
Geologist collecting igneous rock samples in Lake Clark Nat'l Park
The photo was taken by Erin Todd during helicopter-supported geologic fieldwork in Lake Clark National Park this past summer.
The photo was taken by Erin Todd during helicopter-supported geologic fieldwork in Lake Clark National Park this past summer.
Geologist collecting rock samples exposed in a glacial stream valley
USGS research geologist Jamey Jones collects multiple samples of rocks exposed in a glacial stream valley near Lake Clark.
USGS research geologist Jamey Jones collects multiple samples of rocks exposed in a glacial stream valley near Lake Clark.
Geologist stands on granite dike intruding darker granodiorite
USGS research geologist Jamey Jones stands on a dike of granite intruding darker granodiorite, with helicopter in background.
USGS research geologist Jamey Jones stands on a dike of granite intruding darker granodiorite, with helicopter in background.
Geologists collect samples and take notes near Lake Clark
USGS research geologists Richard Lease (left) and Jamey Jones (right) take notes and collect samples of fine-grained metamorphic rock hosted as an inclusion in coarser-grained granodiorite.
USGS research geologists Richard Lease (left) and Jamey Jones (right) take notes and collect samples of fine-grained metamorphic rock hosted as an inclusion in coarser-grained granodiorite.
Geologists make observations above glacial valley
USGS research geologists Jamey Jones (left) and Richard Lease (right) make observations of rock units revealed by the glacier below.
USGS research geologists Jamey Jones (left) and Richard Lease (right) make observations of rock units revealed by the glacier below.
Molybdenite mineral coating on a fractured surface
Molybdenite mineral coating on a fractured surface in Tertiary granite north of Lake Clark
Molybdenite mineral coating on a fractured surface in Tertiary granite north of Lake Clark
Geologists discuss big picture geology of Lake Clark National Park
USGS research geologists Jamey Jones (left) and Erin Todd (right) discuss the "big picture" geology in their project area in and around Lake Clark National Park. Redoubt volcano in background left; baseball-sized cobbles on ground at researchers feet are pumice cobbles from the 2009(?) eruption of Redoubt volcano.
USGS research geologists Jamey Jones (left) and Erin Todd (right) discuss the "big picture" geology in their project area in and around Lake Clark National Park. Redoubt volcano in background left; baseball-sized cobbles on ground at researchers feet are pumice cobbles from the 2009(?) eruption of Redoubt volcano.
Geologist collects sample with helicopter in background, Lake Clark
Jamey Jones collects a sample of Talkeenta Formation volcaniclastic sandstone for detrital zircon geochronology.
Jamey Jones collects a sample of Talkeenta Formation volcaniclastic sandstone for detrital zircon geochronology.
Scientist taking measurements on cliff outcrop
USGS researcher Jonathan Caine measures vein orientation at an outcrop of late Cretaceous pluton in Lake Clark National Park.
USGS researcher Jonathan Caine measures vein orientation at an outcrop of late Cretaceous pluton in Lake Clark National Park.
Four different phases of rock and high-temperature silicate fluids
Cross-cutting relationships of at least 4 different phases of rock and high-temperature silicate fluids in a sample from the Lake Clark area.
Cross-cutting relationships of at least 4 different phases of rock and high-temperature silicate fluids in a sample from the Lake Clark area.
Science and Products
Understanding PGE, Cr, Ni and Cu Potential in Ophiolitic Rocks in Alaska
Ophiolites are sections of oceanic lithosphere that have been structurally emplaced onto continental crust. The ultramafic components of some ophiolites contain podiform chromitites, an important potential source of several strategic and critical minerals, including chromium and platinum group elements (PGE). Yet the tectonics and petrogenesis of several Alaskan ophiolites is poorly understood...
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 sulfides...
Sample Collection, Kanuti, Alaska
USGS researcher collecting samples in Kanuti, Alaska. The samples collected in this location were more resistant to weathering than the surrounding rock indicating a change in lithology.
USGS researcher collecting samples in Kanuti, Alaska. The samples collected in this location were more resistant to weathering than the surrounding rock indicating a change in lithology.
Recording observations on the outcrop of the Kanuti Ophiolite
USGS researcher making observations and recording information on the outcrop of the Kanuti Ophiolite in Alaska. The Kanuti ophiolite is a mafic-ultramafic thrust sheet of probable Jurassic age, formerly considered to be the upper part of the Yukon-Koyukuk ophiolite (Angayucham terrane).
USGS researcher making observations and recording information on the outcrop of the Kanuti Ophiolite in Alaska. The Kanuti ophiolite is a mafic-ultramafic thrust sheet of probable Jurassic age, formerly considered to be the upper part of the Yukon-Koyukuk ophiolite (Angayucham terrane).
Leave no stone unturned
USGS researcher collecting one more sample while waiting for the helicopter in Kanuti, Alaska. The Kanuti ophiolite is a mafic-ultramafic thrust sheet of probable Jurassic age, formerly considered to be the upper part of the Yukon-Koyukuk ophiolite (Angayucham terrane).
USGS researcher collecting one more sample while waiting for the helicopter in Kanuti, Alaska. The Kanuti ophiolite is a mafic-ultramafic thrust sheet of probable Jurassic age, formerly considered to be the upper part of the Yukon-Koyukuk ophiolite (Angayucham terrane).
Variation of weathering on rock surface
Variation of weathering and lichen growth on the rock surface reveals veins and segregated zones with different mineralogy.
Variation of weathering and lichen growth on the rock surface reveals veins and segregated zones with different mineralogy.
Geologist collecting igneous rock samples in Lake Clark Nat'l Park
The photo was taken by Erin Todd during helicopter-supported geologic fieldwork in Lake Clark National Park this past summer.
The photo was taken by Erin Todd during helicopter-supported geologic fieldwork in Lake Clark National Park this past summer.
Geologist collecting rock samples exposed in a glacial stream valley
USGS research geologist Jamey Jones collects multiple samples of rocks exposed in a glacial stream valley near Lake Clark.
USGS research geologist Jamey Jones collects multiple samples of rocks exposed in a glacial stream valley near Lake Clark.
Geologist stands on granite dike intruding darker granodiorite
USGS research geologist Jamey Jones stands on a dike of granite intruding darker granodiorite, with helicopter in background.
USGS research geologist Jamey Jones stands on a dike of granite intruding darker granodiorite, with helicopter in background.
Geologists collect samples and take notes near Lake Clark
USGS research geologists Richard Lease (left) and Jamey Jones (right) take notes and collect samples of fine-grained metamorphic rock hosted as an inclusion in coarser-grained granodiorite.
USGS research geologists Richard Lease (left) and Jamey Jones (right) take notes and collect samples of fine-grained metamorphic rock hosted as an inclusion in coarser-grained granodiorite.
Geologists make observations above glacial valley
USGS research geologists Jamey Jones (left) and Richard Lease (right) make observations of rock units revealed by the glacier below.
USGS research geologists Jamey Jones (left) and Richard Lease (right) make observations of rock units revealed by the glacier below.
Molybdenite mineral coating on a fractured surface
Molybdenite mineral coating on a fractured surface in Tertiary granite north of Lake Clark
Molybdenite mineral coating on a fractured surface in Tertiary granite north of Lake Clark
Geologists discuss big picture geology of Lake Clark National Park
USGS research geologists Jamey Jones (left) and Erin Todd (right) discuss the "big picture" geology in their project area in and around Lake Clark National Park. Redoubt volcano in background left; baseball-sized cobbles on ground at researchers feet are pumice cobbles from the 2009(?) eruption of Redoubt volcano.
USGS research geologists Jamey Jones (left) and Erin Todd (right) discuss the "big picture" geology in their project area in and around Lake Clark National Park. Redoubt volcano in background left; baseball-sized cobbles on ground at researchers feet are pumice cobbles from the 2009(?) eruption of Redoubt volcano.
Geologist collects sample with helicopter in background, Lake Clark
Jamey Jones collects a sample of Talkeenta Formation volcaniclastic sandstone for detrital zircon geochronology.
Jamey Jones collects a sample of Talkeenta Formation volcaniclastic sandstone for detrital zircon geochronology.
Scientist taking measurements on cliff outcrop
USGS researcher Jonathan Caine measures vein orientation at an outcrop of late Cretaceous pluton in Lake Clark National Park.
USGS researcher Jonathan Caine measures vein orientation at an outcrop of late Cretaceous pluton in Lake Clark National Park.
Four different phases of rock and high-temperature silicate fluids
Cross-cutting relationships of at least 4 different phases of rock and high-temperature silicate fluids in a sample from the Lake Clark area.
Cross-cutting relationships of at least 4 different phases of rock and high-temperature silicate fluids in a sample from the Lake Clark area.
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government