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 Electromagnetics (EM) and Ground Magnetotellurics (MT): 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.
Return to Mineral Resources Program | Geology, Geophysics, and Geochemistry Science Center
Below are other science projects associated with this project.
Ozark Dome-Arkoma Basin-Ouachita Transect
Earth Mapping Resources Initiative (Earth MRI)
Unconventional Stratabound Critical Mineral Deposits of the Midcontinent: Linkages Between Mineralization in Marine Epicontinental Sedimentary Basin Systems
Systems Approach to Critical Minerals Inventory, Research, and Assessment
Mississippi Alluvial Plain (MAP): Water Use and Availability Program
- Overview
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 Electromagnetics (EM) and Ground Magnetotellurics (MT): 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.
Sources/Usage: Public Domain.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.
Sources/Usage: 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. Return to Mineral Resources Program | Geology, Geophysics, and Geochemistry Science Center
- Science
Below are other science projects associated with this project.
Ozark 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 evolution...Earth Mapping Resources Initiative (Earth MRI)
The goal of Earth MRI is to improve our knowledge of the geologic framework in the United States and to identify areas that may have the potential to contain undiscovered critical mineral resources. Enhancement of our domestic mineral supply will decrease the Nation’s reliance on foreign sources of minerals that are fundamental to our security and economy.Unconventional 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 midcontinent stratabound "Bathtub Rim" deposits for rare earth elements, cobalt, lithium, and associated critical mineral prospectivity and to develop and test new ore genesis models.Systems 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 materials from major deposits in each system...Mississippi 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.The U.S... - Data
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