A field assistant pans for monazite and rare earth minerals in Wolf Creek, which cuts through the Melozitna granite. This area is part of the Bureau of Land Management's Central Yukon Planning Area, where USGS did a critical mineral assessment in 2015.
Susan Karl (Former Employee)
Science and Products
Filter Total Items: 22
Panning for Rare Earths
A field assistant pans for monazite and rare earth minerals in Wolf Creek, which cuts through the Melozitna granite. This area is part of the Bureau of Land Management's Central Yukon Planning Area, where USGS did a critical mineral assessment in 2015.
Filter Total Items: 64
GIS-based identification of areas that have resource potential for critical minerals in six selected groups of deposit types in Alaska GIS-based identification of areas that have resource potential for critical minerals in six selected groups of deposit types in Alaska
Alaska has considerable potential for undiscovered mineral resources. This report evaluates potential for undiscovered critical minerals in Alaska. Critical minerals are those for which the United States imports more than half of its total supply and which are largely derived from nations that cannot be considered reliable trading partners. In this report, estimated resource potential...
Volcanogenic massive sulphide and orogenic gold deposits of northern southeast Alaska Volcanogenic massive sulphide and orogenic gold deposits of northern southeast Alaska
This five-day field trip visits the most significant mineral deposits in northern southeast Alaska. The trip begins and ends with regional transects in the interior Intermontane terranes around Whitehorse, Yukon, and the Insular terranes along the northern Chatham Strait region of southeast Alaska (Fig. A-1 and Fig. A-2; Plate-1). To put the deposits in a regional tectonic framework, the...
Authors
Patrick J Sack, Susan M. Karl, Nathan Steeves, J Bruce Gemmell
Field guide to the Mesozoic arc and accretionary complex of South-Central Alaska, Indian to Hatcher Pass Field guide to the Mesozoic arc and accretionary complex of South-Central Alaska, Indian to Hatcher Pass
This field trip traverses exposures of a multi-generation Mesozoic magmatic arc and subduction-accretion complex that had a complicated history of magmatic activity and experienced variations in composition and deformational style in response to changes in the tectonic environment. This Mesozoic arc formed at an unknown latitude to the south, was accreted to North America, and was...
Authors
Susan M. Karl, P.J. Oswald, Chad P. Hults
GIS-Based Identification of Areas with Mineral Resource Potential for Six Selected Deposit Groups, Bureau of Land Management Central Yukon Planning Area, Alaska 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 intrusive igneous rocks, (2) placer and...
Authors
James V. Jones, Susan M. Karl, Keith A. Labay, Nora B. Shew, Matthew Granitto, Timothy S. Hayes, Jeffrey L. Mauk, Jeanine M. Schmidt, Erin Todd, Bronwen Wang, Melanie B. Werdon, Douglas B. Yager
The Early Jurassic Bokan Mountain peralkaline granitic complex (southeastern Alaska): geochemistry, petrogenesis and rare-metal mineralization The Early Jurassic Bokan Mountain peralkaline granitic complex (southeastern Alaska): geochemistry, petrogenesis and rare-metal mineralization
The Early Jurassic (ca. 177 Ma) Bokan Mountain granitic complex, located on southern Prince of Wales Island, southernmost Alaska, cross-cuts Paleozoic igneous and metasedimentary rocks of the Alexander terrane of the North American Cordillera and was emplaced during a rifting event. The complex is a circular body (~3 km in diameter) of peralkaline granitic composition that has a core of
Authors
Jaroslav Dostal, Daniel J. Kontak, Susan M. Karl
Bokan Mountain peralkaline granitic complex, Alexander terrane (southeastern Alaska): evidence for Early Jurassic rifting prior to accretion with North America Bokan Mountain peralkaline granitic complex, Alexander terrane (southeastern Alaska): evidence for Early Jurassic rifting prior to accretion with North America
The circular Bokan Mountain complex (BMC) on southern Prince of Wales Island, southernmost Alaska, is a Jurassic peralkaline granitic intrusion about 3 km in diameter that crosscuts igneous and metasedimentary rocks of the Alexander terrane. The BMC hosts significant rare metal (rare earth elements, Y, U, Th, Zr, and Nb) mineralization related to the last stage of BMC emplacement. U–Pb...
Authors
Jaroslav Dostal, Susan M. Karl, J. Duncan Keppie, Daniel J. Kontak, J. Gregory Shellnutt
ULFEM time series analysis package ULFEM time series analysis package
This manual describes how to use the Ultra-Low-Frequency ElectroMagnetic (ULFEM) software package. Casual users can read the quick-start guide and will probably not need any more information than this. For users who may wish to modify the code, we provide further description of the routines.
Authors
Susan M. Karl, Darcy McPhee, Jonathan M. G. Glen, Simon L. Klemperer
Field guide to the accretionary complex and neotectonics of south-central Alaska, Anchorage to Seward Field guide to the accretionary complex and neotectonics of south-central Alaska, Anchorage to Seward
No abstract available.
Authors
Susan M. Karl, Dwight C. Bradley, Rodney Combellick, Marti L. Miller
The Cannery Formation: Devonian to Early Permian arc-marginal deposits within the Alexander Terrane, southeastern Alaska The Cannery Formation: Devonian to Early Permian arc-marginal deposits within the Alexander Terrane, southeastern Alaska
The Cannery Formation consists of green, red, and gray ribbon chert, siliceous siltstone, graywacke-chert turbidites, and volcaniclastic sandstone. Because it contains early Permian fossils at and near its type area in Cannery Cove, on Admiralty Island in southeastern Alaska, the formation was originally defined as a Permian stratigraphic unit. Similar rocks exposed in Windfall Harbor on...
Authors
Susan M. Karl, Paul W. Layer, Anita G. Harris, Peter J. Haeussler, Benita L. Murchey
Fossil locations and data for the Taylor Mountains, and parts of the Bethel, Goodnews, and Dillingham quadrangles, southwestern Alaska Fossil locations and data for the Taylor Mountains, and parts of the Bethel, Goodnews, and Dillingham quadrangles, southwestern Alaska
Information about fossils collected by U.S. Geological Survey, State of Alaska, academic, and industry geologists that have been reported in literature or archived in reports from the former U.S. Geological Survey Branch of Paleontology and Stratigraphy are compiled on a plate and table in this report to provide comprehensive paleontologic age data for the Taylor Mountains quadrangle...
Authors
Susan M. Karl, R. B. Blodgett, Keith A. Labay, S. E. Box, D. C. Bradley, Marti L. Miller, W. K. Wallace, J.F. Baichtal
Geochemical and sulfur-isotopic signatures of volcanogenic massive sulfide deposits on Prince of Wales Island and vicinity, southeastern Alaska Geochemical and sulfur-isotopic signatures of volcanogenic massive sulfide deposits on Prince of Wales Island and vicinity, southeastern Alaska
Stratabound volcanogenic massive sulfide (VMS) deposits on Prince of Wales Island and vicinity, southeastern Alaska, occur in two volcanosedimentary sequences of Late Proterozoic through Cambrian and of Ordovician through Early Silurian age. This study presents geochemical data on sulfide-rich samples, in situ laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) of...
Authors
John F. Slack, Wayne C. Shanks, Susan M. Karl, Pamela A. Gemery, Peter E. Bittenbender, W. Ian Ridley
Detrital zircon geochronology of some neoproterozoic to triassic rocks in interior Alaska Detrital zircon geochronology of some neoproterozoic to triassic rocks in interior Alaska
No abstract available.
Authors
D. C. Bradley, W.C. McClelland, J. L. Wooden, A.B. Till, S. M. Roeske, Marti L. Miller, Susan M. Karl, J.G. Abbott
Science and Products
Filter Total Items: 22
Panning for Rare Earths
A field assistant pans for monazite and rare earth minerals in Wolf Creek, which cuts through the Melozitna granite. This area is part of the Bureau of Land Management's Central Yukon Planning Area, where USGS did a critical mineral assessment in 2015.
A field assistant pans for monazite and rare earth minerals in Wolf Creek, which cuts through the Melozitna granite. This area is part of the Bureau of Land Management's Central Yukon Planning Area, where USGS did a critical mineral assessment in 2015.
Filter Total Items: 64
GIS-based identification of areas that have resource potential for critical minerals in six selected groups of deposit types in Alaska GIS-based identification of areas that have resource potential for critical minerals in six selected groups of deposit types in Alaska
Alaska has considerable potential for undiscovered mineral resources. This report evaluates potential for undiscovered critical minerals in Alaska. Critical minerals are those for which the United States imports more than half of its total supply and which are largely derived from nations that cannot be considered reliable trading partners. In this report, estimated resource potential...
Volcanogenic massive sulphide and orogenic gold deposits of northern southeast Alaska Volcanogenic massive sulphide and orogenic gold deposits of northern southeast Alaska
This five-day field trip visits the most significant mineral deposits in northern southeast Alaska. The trip begins and ends with regional transects in the interior Intermontane terranes around Whitehorse, Yukon, and the Insular terranes along the northern Chatham Strait region of southeast Alaska (Fig. A-1 and Fig. A-2; Plate-1). To put the deposits in a regional tectonic framework, the...
Authors
Patrick J Sack, Susan M. Karl, Nathan Steeves, J Bruce Gemmell
Field guide to the Mesozoic arc and accretionary complex of South-Central Alaska, Indian to Hatcher Pass Field guide to the Mesozoic arc and accretionary complex of South-Central Alaska, Indian to Hatcher Pass
This field trip traverses exposures of a multi-generation Mesozoic magmatic arc and subduction-accretion complex that had a complicated history of magmatic activity and experienced variations in composition and deformational style in response to changes in the tectonic environment. This Mesozoic arc formed at an unknown latitude to the south, was accreted to North America, and was...
Authors
Susan M. Karl, P.J. Oswald, Chad P. Hults
GIS-Based Identification of Areas with Mineral Resource Potential for Six Selected Deposit Groups, Bureau of Land Management Central Yukon Planning Area, Alaska 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 intrusive igneous rocks, (2) placer and...
Authors
James V. Jones, Susan M. Karl, Keith A. Labay, Nora B. Shew, Matthew Granitto, Timothy S. Hayes, Jeffrey L. Mauk, Jeanine M. Schmidt, Erin Todd, Bronwen Wang, Melanie B. Werdon, Douglas B. Yager
The Early Jurassic Bokan Mountain peralkaline granitic complex (southeastern Alaska): geochemistry, petrogenesis and rare-metal mineralization The Early Jurassic Bokan Mountain peralkaline granitic complex (southeastern Alaska): geochemistry, petrogenesis and rare-metal mineralization
The Early Jurassic (ca. 177 Ma) Bokan Mountain granitic complex, located on southern Prince of Wales Island, southernmost Alaska, cross-cuts Paleozoic igneous and metasedimentary rocks of the Alexander terrane of the North American Cordillera and was emplaced during a rifting event. The complex is a circular body (~3 km in diameter) of peralkaline granitic composition that has a core of
Authors
Jaroslav Dostal, Daniel J. Kontak, Susan M. Karl
Bokan Mountain peralkaline granitic complex, Alexander terrane (southeastern Alaska): evidence for Early Jurassic rifting prior to accretion with North America Bokan Mountain peralkaline granitic complex, Alexander terrane (southeastern Alaska): evidence for Early Jurassic rifting prior to accretion with North America
The circular Bokan Mountain complex (BMC) on southern Prince of Wales Island, southernmost Alaska, is a Jurassic peralkaline granitic intrusion about 3 km in diameter that crosscuts igneous and metasedimentary rocks of the Alexander terrane. The BMC hosts significant rare metal (rare earth elements, Y, U, Th, Zr, and Nb) mineralization related to the last stage of BMC emplacement. U–Pb...
Authors
Jaroslav Dostal, Susan M. Karl, J. Duncan Keppie, Daniel J. Kontak, J. Gregory Shellnutt
ULFEM time series analysis package ULFEM time series analysis package
This manual describes how to use the Ultra-Low-Frequency ElectroMagnetic (ULFEM) software package. Casual users can read the quick-start guide and will probably not need any more information than this. For users who may wish to modify the code, we provide further description of the routines.
Authors
Susan M. Karl, Darcy McPhee, Jonathan M. G. Glen, Simon L. Klemperer
Field guide to the accretionary complex and neotectonics of south-central Alaska, Anchorage to Seward Field guide to the accretionary complex and neotectonics of south-central Alaska, Anchorage to Seward
No abstract available.
Authors
Susan M. Karl, Dwight C. Bradley, Rodney Combellick, Marti L. Miller
The Cannery Formation: Devonian to Early Permian arc-marginal deposits within the Alexander Terrane, southeastern Alaska The Cannery Formation: Devonian to Early Permian arc-marginal deposits within the Alexander Terrane, southeastern Alaska
The Cannery Formation consists of green, red, and gray ribbon chert, siliceous siltstone, graywacke-chert turbidites, and volcaniclastic sandstone. Because it contains early Permian fossils at and near its type area in Cannery Cove, on Admiralty Island in southeastern Alaska, the formation was originally defined as a Permian stratigraphic unit. Similar rocks exposed in Windfall Harbor on...
Authors
Susan M. Karl, Paul W. Layer, Anita G. Harris, Peter J. Haeussler, Benita L. Murchey
Fossil locations and data for the Taylor Mountains, and parts of the Bethel, Goodnews, and Dillingham quadrangles, southwestern Alaska Fossil locations and data for the Taylor Mountains, and parts of the Bethel, Goodnews, and Dillingham quadrangles, southwestern Alaska
Information about fossils collected by U.S. Geological Survey, State of Alaska, academic, and industry geologists that have been reported in literature or archived in reports from the former U.S. Geological Survey Branch of Paleontology and Stratigraphy are compiled on a plate and table in this report to provide comprehensive paleontologic age data for the Taylor Mountains quadrangle...
Authors
Susan M. Karl, R. B. Blodgett, Keith A. Labay, S. E. Box, D. C. Bradley, Marti L. Miller, W. K. Wallace, J.F. Baichtal
Geochemical and sulfur-isotopic signatures of volcanogenic massive sulfide deposits on Prince of Wales Island and vicinity, southeastern Alaska Geochemical and sulfur-isotopic signatures of volcanogenic massive sulfide deposits on Prince of Wales Island and vicinity, southeastern Alaska
Stratabound volcanogenic massive sulfide (VMS) deposits on Prince of Wales Island and vicinity, southeastern Alaska, occur in two volcanosedimentary sequences of Late Proterozoic through Cambrian and of Ordovician through Early Silurian age. This study presents geochemical data on sulfide-rich samples, in situ laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) of...
Authors
John F. Slack, Wayne C. Shanks, Susan M. Karl, Pamela A. Gemery, Peter E. Bittenbender, W. Ian Ridley
Detrital zircon geochronology of some neoproterozoic to triassic rocks in interior Alaska Detrital zircon geochronology of some neoproterozoic to triassic rocks in interior Alaska
No abstract available.
Authors
D. C. Bradley, W.C. McClelland, J. L. Wooden, A.B. Till, S. M. Roeske, Marti L. Miller, Susan M. Karl, J.G. Abbott
*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