Mineral Resources On-Line Spatial Data: field methods

Mineral Resources On-Line Spatial Data

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Field methods

Research procedures and instrumental means to measure, collect data and samples, and observe in the natural areas where the materials, phenomena, structures, or species being studied occur.

Subtopics:
Field inventory and monitoring (110 items)
Field sampling (11 items)
Geolocation measurement (1 items)

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Results 1 - 10 of 121 listed by similarity [list alphabetically]

Field demonstrations of five geophysical methods that could be used to characterize deposits of alluvial aggregate [New Window]: Data from seismic reflection and refraction, electromagnetic sounding, and resistivity profiling in a study area in Indiana. Exact location is not provided.
Field estimates of gravity terrain corrections and Y2K-compatible method to convert from gravity readings with multiple base stations to tide- and long-term drift-corrected observations [New Window]: Fortran code to facilitate correction and interpretation of gravity observations
Geochemical analysis of soils and sediments, Coeur d'Alene drainage basin, Idaho: Sampling, analytical methods, and results [New Window]: Chemical composition of sediments and soils are of interest because of the potential for human and wildlife health impacts from high metal contents due to over 100 years of mining activity.
Geologic field notes, geochemical analyses, and field photographs of outcrops and rock samples from the Big Delta B-1 quadrangle, east-central Alaska [New Window]: Major element oxide and trace element geochemical analyses, including those for gold, silver, and base metals, for representative rock units and for grab samples from quartz veins and mineralized zones within the quadrangle
Geophysical framework of the southwestern Nevada volcanic field and hydrogeologic implications [New Window]: Report describing detailed interpretation of geophysical survey data to draw inferences about subsurface geologic features and likely consequences for the hydrogeologic system.
Introduction to potential fields: gravity [New Window]: Explanation of the Earth's gravitational field, emphasizing how USGS scientists measure gravity and portray these measurements on maps. Explains terminology of gravity anomaly maps and their relationship to the rock types and other geologic features.
Introduction to potential fields: magnetics [New Window]: Explanation of the Earth's magnetic field and how USGS measures it. Defines magnetic anomaly, induced and remanent magnetism in rocks, and describes magnetic anomaly maps.
Preliminary isostatic gravity map of the Sonoma Volcanic field and vicinity, Sonoma and Napa counties, California [New Window]: Gravity station data from three separate surveys
Preliminary potential-field constraints on the geometry of the San Fernando basin, southern California [New Window]: Results of mathematical modeling of gravity and magnetic anomaly data to infer the geologic structure of the area
Results of gravity fieldwork conducted in March 2008 in the Moapa Valley region of Clark County, Nevada [New Window]: Study aids understanding of local geologic structure and ground-water flow, includes principal facts for 266 gravity stations and physical properties of representative rock samples.

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