Benjamin J Drenth, Ph.D.
Biography
Ben Drenth is a Research Geophysicist in the Geology, Geophysics, and Geochemistry Science Center in Denver, Colorado. His research is focused on the interpretation of gravity and magnetic geophysical data, in conjunction with other types of geophysical data and geologic information, to address 3D geologic mapping problems at a variety of scales. He specializes in interpretation in challenging physical and geologic environments, such as high-relief terrain and areas where the rocks of interest are concealed. USGS areas of focus include the National Cooperative Geologic Mapping and Mineral Resource Programs. He received a PhD in geophysics from the University of Oklahoma in 2009, a MS in geophysics from the University of Texas at El Paso in 2005, and a BS in geological engineering from Michigan Technological University in 2003.
Science and Products
Geophysics of the Midcontinent Rift Region
The Midcontinent Rift system and surrounding Precambrian rocks are known to host highly significant mineral resources. Our project objectives are to increase understanding of this system through the integration of new and legacy geophysical data with geochemical and borehole data, map the lithology and structure of PreCambrian rocks, and develop an integrated 3D geologic model of the region....
Multidisciplinary Studies to Image and Characterize the Mineral Resource Potential of the Midcontinent Rift, USA
This multidisciplinary study seeks to image and characterize the mineral resource potential of the Midcontinent Rift System. Combining various geophysical methods with detailed mapping and geochemical analyses will help to define the geographic extent of the Rift and clarify its geologic makeup and configuration.
Airborne magnetic survey, Iron Mountain-Chatham region, central Upper Peninsula, Michigan, 2018
This publication provides digital flight line data for a high-resolution magnetic survey over an area of the central Upper Peninsula of Michigan. The survey area lies approximately between the towns of Iron Mountain and Chatham. Data for this survey were collected by EON Geosciences under contract with the USGS using a fixed wing aircraft with a magnetometer mounted in the tail stinger. The...
Principal facts of regional gravity data in the central Upper Peninsula, Michigan, and northeastern Wisconsin
Gravity data were collected from 2016 through 2019 to assist in mapping surface and subsurface geology in the central Upper Peninsula of Michigan and in neighboring northeastern Wisconsin. This data release provides principal facts for 1536 new gravity stations that were acquired to supplement existing public gravity data coverage.
Density and magnetic susceptibility measurements on Precambrian rocks in the Iron Mountain-Menominee region, Michigan-Wisconsin
The U.S. Geological Survey (USGS) collected rock physical property measurements to help understand causative sources of gravity and magnetic survey anomalies in the Iron Mountain-Menominee region, Michigan-Wisconsin. A total of 2,356 measurements of magnetic susceptibility and density from 152 locations have been conducted on Precambrian rocks. The measurements aid in interpretation of ne
Airborne Magnetic Total-Field Survey, Iron Mountain-Menominee Region, Michigan-Wisconsin, USA
This data release includes the airborne magnetic survey data collected from the Iron Mountain-Menominee region of Michigan and Wisconsin. The Mineral Resources Program of the U.S. Geological Survey is tasked with understanding the nation's mineral resources. Precambrian rocks in the region are poorly mapped and understood. Detailed high-resolution airborne magnetic surveys, ground gravity sur...
Airborne magnetic and radiometric survey of the southeast Mojave Desert, California and Nevada
A high-resolution airborne magnetic and radiometric survey of the southeast Mojave Desert, parts of California and Nevada was flown by EDCON-PRJ, Inc. from December 13, 2019 to March 21, 2020. The high-resolution fixed-wing survey was flown at a flightline spacing of 200 m, an azimuth of 70 degrees, a nominal elevation above ground of 100 m, and consists of about 17,277 line-kilom
Principal facts of regional gravity data in northeast Iowa
Gravity data were collected from 2016 through 2018 to assist in mapping subsurface geology in northeastern Iowa. This data release provides principal facts for 1080 new gravity stations that were acquired to supplement existing public gravity data coverage.
Airborne Geophysical Survey Inventory of the Conterminous United States, Alaska, Hawaii, and Puerto Rico
This data release is a compilation of the locations of airborne geophysical surveys in the United States. The inventory documents public airborne geophysical surveys primarily flown by or contracted by the USGS from 1943 to present. In addition, surveys from the State of Alaska, Department of Natural Resources, Division of Geological and Geophysical Surveys (DGGS): Airborne GeophysWeb
GIS and Data Tables for Focus Areas for Potential Domestic Nonfuel Sources of Rare Earth Elements
In response to Executive Order 13817 of December 20, 2017, the U.S. Geological Survey (USGS) coordinated with the Bureau of Land Management (BLM) to identify 35 nonfuel minerals or mineral materials considered critical to the economic and national security of the United States (U.S.). Acquiring information on possible domestic sources of these critical minerals is the basis of the
Physical Properties by Geologic Unit in the Southern San Luis Basin, New Mexico
Physical properties of geologic units are important for geophysical interpretation because they provide the tie between lithology and geophysical fields. For gravity data, the applicable physical property is bulk density, which is the overall mass per unit volume of rocks, sediments, and their pore spaces. Bulk dry density is the mass per unit volume measured when the sample is dry. Satu
Airborne Magnetic Total-Field Survey, Manchester Region, Iowa, USA
This data release includes the airborne magnetic survey data collected from the Manchester region of Iowa. The Mineral Resources Program of the U.S. Geological Survey is tasked with understanding the nation's mineral resources. Precambrian rocks concealed under Paleozoic sedimentary rocks in northeast Iowa are poorly mapped and understood. Detailed high-resolution airborne magnetic surveys, g...
Principal facts of gravity data in the southern San Luis Basin, northern New Mexico
Gravity data were collected from 2006 through 2015 to assist in mapping subsurface geology in the southern San Luis Basin, northern New Mexico. This data release provides principal facts for 566 new gravity stations that were acquired to fill in gaps in the existing public gravity data coverage.
Focus areas for data acquisition for potential domestic resources of 11 critical minerals in the conterminous United States, Hawaii, and Puerto Rico—Aluminum, cobalt, graphite, lithium, niobium, platinum-group elements, rare earth elements, tantalum, tin, titanium, and tungsten
In response to a need for information on potential domestic sources of critical minerals, the Earth Mapping Resources Initiative (Earth MRI) was established to identify and prioritize areas for acquisition of new geologic mapping, geophysical data, and elevation data to improve our knowledge of the geologic framework of the United States. Phase 1...
Hammarstrom, Jane M.; Dicken, Connie L.; Day, Warren C.; Hofstra, Albert H.; Drenth, Benjamin J.; Shah, Anjana K.; McCafferty, Anne E.; Woodruff, Laurel G.; Foley, Nora K.; Ponce, David A.; Frost, Thomas P.; Stillings, Lisa L.
Evidence for a concealed Midcontinent Rift-related northeast Iowa intrusive complex
Large amplitude aeromagnetic and gravity anomalies over a ~9500 km2 area of northeast Iowa and southeast Minnesota have been interpreted to reflect the northeast Iowa intrusive complex (NEIIC), a buried intrusive igneous complex composed of mafic/ultramafic rocks in the Yavapai Province (1.8–1.7 Ga). Hundreds of meters of Paleozoic...
Drenth, Benjamin J.; Souders, A. Kate; Schulz, Klaus J.; Feinberg, Joshua M.; Anderson, Raymond R.; Chandler, Val W.; Cannon, William F.; Clark, Ryan Finding the gaps in America’s magnetic maps
No abstract available.
Drenth, Benjamin J.; Grauch, V. J. Finding the gaps in America’s magnetic maps
No abstract available.
Drenth, Benjamin J.; Grauch, V. J. A shallow rift basin segmented in space and time: The southern San Luis Basin, Rio Grande rift, northern New Mexico, U.S.A.
Interpretation of gravity, magnetotelluric, and aeromagnetic data in conjunction with geologic constraints reveals details of basin geometry, thickness, and spatiotemporal evolution of the southern San Luis Basin, one of the major basins of the northern Rio Grande rift. Spatial variations of low-density basin-fill thickness are estimated primarily...
Drenth, Benjamin J.; Grauch, V. J.; Turner, Kenzie J.; Rodriguez, Brian D.; Thompson, Ren A.; Bauer, Paul W. A shifting rift—Geophysical insights into the evolution of Rio Grande rift margins and the Embudo transfer zone near Taos, New Mexico
We present a detailed example of how a subbasin develops adjacent to a transfer zone in the Rio Grande rift. The Embudo transfer zone in the Rio Grande rift is considered one of the classic examples and has been used as the inspiration for several theoretical models. Despite this attention, the history of its development into a major rift...
Grauch, V.J.S.; Bauer, Paul W.; Drenth, Benjamin J.; Kelson, Keith I. Geophysical expression of buried range-front embayment structure: Great Sand Dunes National Park, Rio Grande rift, Colorado
Great Sand Dunes National Park and Preserve (GRSA, Colorado) lies along the eastern margin of the San Luis Basin and the tectonically active Sangre de Cristo fault system that are part of the northern Rio Grande rift. GRSA lies within a prominent embayment in the range front where two separate sections of the Sangre de Cristo fault system...
Drenth, Benjamin J.; Grauch, V. J.; Ruleman, Chester A.; Schenk, Judith A Geologic map and cross sections of the Embudo Fault Zone in the Southern Taos Valley, Taos County, New Mexico
The southern Taos Valley encompasses the physiographic and geologic transition zone between the Picuris Mountains and the San Luis Basin of the Rio Grande rift. The Embudo fault zone is the rift transfer structure that has accommodated the kinematic disparities between the San Luis Basin and the Española Basin during Neogene rift extension. The...
Bauer, Paul W.; Kelson, Keith I.; Grauch, V.J.S.; Drenth, Benjamin J.; Johnson, Peggy S.; Aby, Scott B.; Felix, Brigitte Physical properties by geologic unit in the southern San Luis Basin, New Mexico
Physical properties of geologic units are important for geophysical interpretation because they provide the tie between lithology and geophysical fields. For gravity data, the applicable physical property is bulk density, which is the overall mass per unit volume of rocks, sediments, and their pore spaces. Bulk dry density is the mass per unit...
Grauch, V. J.; Drenth, Benjamin J. Principal facts of gravity data in the southern San Luis Basin, northern New Mexico
Gravity data were collected from 2006 through 2015 to assist in mapping subsurface geology in the southern San Luis Basin, northern New Mexico. This data release provides principal facts for 566 new gravity stations that were acquired to fill in gaps in the existing public gravity data coverage.
Drenth, Benjamin J. Geologic cross sections and preliminary geologic map of the Questa Area, Taos County, New Mexico
In 2011, the senior authors were contacted by Ron Gardiner of Questa, and Village of Questa Mayor Esther Garcia, to discuss the existing and future groundwater supply for the Village of Questa. This meeting led to the development of a plan in 2013 to perform an integrated geologic, geophysical, and hydrogeologic investigation of the Questa area by...
Bauer, Paul W.; Grauch, V.J.S.; Johnson, Peggy S.; Thompson, Ren; Drenth, Benjamin J.; Kelson, Keith I.
Preliminary geophysical interpretations of regional subsurface geology near the Questa Mine Tailing Facility and Guadalupe Mountain, Taos County, New Mexico
This report presents geophysical interpretations of regional subsurface geology in the vicinity of the Tailing Facility of the Questa Mine near Guadalupe Mountain, Taos County, New Mexico, in cooperation with the New Mexico Environment Department. The interpretations were developed from aeromagnetic data, regional gravity data, data from four...
Grauch, V.J.S.; Drenth, Benjamin J.; Thompson, Ren; Bauer, Paul W.
Less than One Percent of the United States Covered by Aeromagnetic Data that Meet Modern Standards
Less than one percent of the United States is mapped by aeromagnetic data that fully meet modern standards and best practices, according to a recent evaluation by the U.S. Geological Survey. Less than five percent of the country has been mapped with data that can be considered adequate in meeting those same standards
Media Advisory: Low-Level Flights to Begin Assessing Local Mineral Resources this Monday
U.S. Geological Survey scientists will conduct a high-resolution airborne survey to study the rock layers under a region of northeastern Iowa, starting Monday, October 19, and lasting into November.