Skip to main content
Advanced Search

Filters: Tags: lamprophyre (X)

2 results (6ms)   

View Results as: JSON ATOM CSV
thumbnail
This cover includes locations of alkaline ultramafic igneous rocks.The igneous rocks are evidence for Permian extensional reactivationof the faults of continental rifts in the map area. Theigneous rocks are Permian lamprophyres and mica peridotites.
thumbnail
This 1:50,000-scale geologic map represents a compilation of the most recent geologic studies of the upper Arkansas River valley, between Leadville and Salida, Colorado. The valley is structurally controlled by an extensional fault system that forms part of the prominent northern Rio Grande rift, an intra-continental region of crustal extension. This work also incorporates new detailed geologic mapping of poorly understood areas within the map area and reinterprets previously studied areas, aided by lidar data that covers 59 percent of the map area. The mapped region extends into the Proterozoic metamorphic and intrusive rocks in the Sawatch Range west of the valley and the Mosquito Range to the east. Paleozoic...
Categories: Data; Tags: 207Pb/206Pb zircon age, 40Ar/39Ar age, Arkansas River, Balltown, Balltown placer gold mining areas, All tags...


    map background search result map search result map Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Lamprophyre and peridotite intrusions Data release for the geologic map of the upper Arkansas River valley region, north-central Colorado Data release for the geologic map of the upper Arkansas River valley region, north-central Colorado Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Lamprophyre and peridotite intrusions