Geophysical Mapping of Geologic Systems Host to Critical Mineral Deposits, Southern Midcontinent, US
Science Center Objects
The objective of this project is to use high-resolution state-of-the-art airborne and regional ground geophysical methods to map an underexplored region of the southern Midcontinent that is important to economic and critical mineral deposits.
Science Issue and Relevance
The southern Midcontinent is a frontier region for mineral exploration. The region is largely underexplored because most of the geology that is important to economic mineral deposits is concealed. Sedimentary cover over and structural relief on buried igneous basement can be substantial. Consequently, conventional surface mapping methods are poorly suited to map covered geologic systems. Subsurface mapping using geophysical techniques is required to characterize the geology and place it in a broader tectonic and mineral systems context.
Methods to Address Issue
The overall objective of this project is to collect, model and interpret high-resolution airborne and ground geophysical data to better understand the concealed geologic systems host to critical metal mineralization. Interpretation of the geophysical data will be supported by drill core examination of concealed geology where available. We are coordinating ground and airborne geophysical efforts across USGS Program and Mission areas including projects funded by the Mineral Resources Program, National Cooperative Geologic Mapping Program, and Water Mission Area. We plan to meet these objectives via three tasks.
- Airborne Magnetic and Radiometric Framework: task objectives are to oversee the collection, processing, and interpretation of several airborne geophysical surveys occurring in the southern Midcontinent
- Electrical Resistivity Framework- Airborne EM and Ground Magnetotellurics: task objective is to use recently collected MT data over the southern Midcontinent to create 3D inversions of the crust underlying important critical mineral deposits in the southern Midcontinent
- Proterozoic geologic framework of southeast Missouri: task objective is to finalize a new 1:250,000-scale geologic map of the St. Francois Mountains and provide geologic framework information critical for support of the geophysical surveys and resulting models and interpretations core to this new project
Data collected as part of our project will be made public and used by the USGS and other federal, state, and industry partners to guide more detailed geologic mapping at local scales. When the data analysis is complete, results will provide state-of-the-art, subsurface maps that will contribute to a wide range of 3D representations of the nations exposed and concealed geology.
Map indicating flight area for tri-state low-level flight survey. The flights will cover 23 counties in Illinois, Kentucky and Indiana, and are included within the red rectangle. Flights began in October and are expected to conclude in December, 2019.
(Public domain.)
Flight area map for northern Arkansas low-level flight. Survey will occur in northwest portion of state over parts of 15 counties. Area to be flown indicated by red outline.
(Public domain.)
Return to Mineral Resources Program | Geology, Geophysics, and Geochemistry Science Center
-
Date published: October 21, 2019Status: ActiveOzark Dome-Arkoma Basin-Ouachita Transect
The Ozark Dome-Arkoma Basin-Ouachita Transect (ODABOuT) project examines the three-dimensional geology of a transect of the southern orogenic margin of North America in its best surface exposure in western Arkansas. The Ozark Dome and Arkoma Basin represent a foreland uplift and foreland basin that formed as a result of the impinging Ouachita orogenic belt. Understanding the geometry and...
Contacts: Mark R Hudson, PhD -
Date published: July 3, 2019Status: ActiveUnconventional Stratabound Critical Mineral Deposits of the Midcontinent: Linkages Between Mineralization in Marine Epicontinental Sedimentary Basin Systems
This project will evaluate and characterize the critical mineral potential of stratabound deposits for the REE, Co, Li, and associated critical mineral prospectivity in the midcontinent region.
Contacts: Poul Emsbo -
Date published: June 24, 2019Status: ActiveSystems Approach to Critical Minerals Inventory, Research, and Assessment
This project supports the Earth Mapping Resources Initiative (EarthMRI) by developing a mineral systems approach for defining focus areas. This project is investigating domestic sources of critical minerals in three sequential stages: inventory, research, and assessment.
1) Inventory the abundance of critical minerals in ore, minerals, and processed...
Contacts: Albert H Hofstra, Peter Vikre -
Date published: September 14, 2016Mississippi Alluvial Plain (MAP): Water Use and Availability Program
The Mississippi Alluvial Plain is one of the most productive agricultural regions in the Nation and depends on groundwater for irrigation. The MAP area constitutes the third largest area of irrigated cropland in the United States. The area is approximately 29,000 square miles (19 million acres) and includes parts of the States of Missouri, Tennessee, Arkansas, Mississippi, and Louisiana....
Contacts: Wade KressAttribution: Lower Mississippi-Gulf Water Science Center
-
Date published: June 2, 2020Airborne magnetic and radiometric survey, southeastern Illinois, western Kentucky, and southern Indiana, 2019
This publication provides digital flight line data for a high-resolution magnetic and radiometric survey over an area of southeast Illinois, western Kentucky, and southern Indiana. The survey includes airborne geophysical data collected as part of the U.S. Geological Survey (USGS) Earth Mapping Resource Initiative (Earth MRI) effort (Day, 2019). Earth MRI is a cooperative effort
-
Date published: October 21, 2019Low-Level Flights to Image 3D Geology in Northern Arkansas
Editor: In the public interest and in accordance with the Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project. Your assistance in informing the local communities is appreciated.
-
Date published: October 21, 2019
Low-Level Flights to Image 3D Geology in Northern Arkansas
Editor: In the public interest and in accordance with the Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project. Your assistance in informing the local communities is appreciated.
-
Date published: October 21, 2019
Low-Level Flights to Image 3D Geology in Illinois, Kentucky and Indiana
Editor: In the public interest and in accordance with the Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project. Your assistance in informing the local communities is appreciated.