Filters: Tags: igneous rocks (X)
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View southwest toward Hobble Basalt Dike, K-Ar age of 3.66±0.54 million years (Ma) (Billingsley and Workman, 2000), in the Moenkopi Formation, Hobble graben in Upper Jump Canyon, 4 miles east of Grand Wash Cliffs.
Aerial view north toward basalt cascades over Esplanade Sandstone rim down graben fault lines, north rim above river mile 185.8.
Basalt boulders in pyroclastic deposits on east side of Whitmore volcano, Whitmore Wash, lower Whitmore Canyon.
View southwest toward Tuckup volcano and basalt flow in west side of upper Tuckup Canyon from the Tuckup Trail.
Photograph showing mining claim dated August 31, 1935, found on Garrett Dikes, south end of Fort Garrett Point (photograph WI139).
Aerial view west toward rim gravel over Kaibab Formation beneath Price Point basalt flows (photograph WI16).
View north and upriver toward remnant of basalt flow from Toroweap area on west side of river mile 225.6.
View of last visible remnant of basalt flow that came from the Toroweap area along the east bank of river mile 254.8.
This data release presents geologic map data for the bedrock geology of the Blanca Peak, Walsenburg, Trinidad, and Alamosa 30' x 60' quadrangles, Colorado. Geologic mapping incorporates new interpretive contributions and compilation from published geologic map data sources primarily ranging from 1:24,000 to 1:50,000 scale. Much of the geology incorporated from published geologic maps is adjusted based on digital elevation model and natural-color image data sources to improve spatial resolution of the data. Spatial adjustments and new interpretations also eliminate mismatches at source map boundaries. This data set represents only the bedrock geology; deposits of unconsolidated, surficial materials that are typically,...
The Alaska Division of Geological & Geophysical Surveys, in collaboration with the University of Alaska Fairbanks, collected mafic rocks in the Ivishak River area of the northeastern Brooks Range during summer 2009 for geochemical sampling. The sampled rocks, including lava flows, sills, and limy volcaniclastic strata, crop out within the carbonate-platform succession of the Carboniferous Lisburne Group. Refer to Herriott and others (2011) for additional information regarding the geologic and geographic context of these samples, preliminary implications of the geochemical data presented here, and a summary of known mafic rock occurrences in the Arctic Alaska terrane. The analytical data tables associated with this...
This report presents 40Ar/39Ar step-heating geochronology results for igneous and metamorphic rocks from the Alaska Division of Geological & Geophysical Surveys' (DGGS) Wrangellia Mineral Assessment project, part of a multi-year effort focusing on improving the publicly available geoscientific information for the western Wrangellia terrane. The samples described in this report were selected and analyzed to improve our understanding of the geology and structural history of the Wrangellia Mineral Assessment project area. A metagabbro rock sample returned a Late Triassic crystallization age consistent with regional ages for Nikolai Greenstone-related magmatism; however, the two amphibole separates ages do not overlap,...
Geochemical data include major, minor and trace element results for 42 alkaline silicate igneous rock samples. Samples were collected from natural exposures/outcrops during field work in the Central Montana Alkaline Province (CMAP) during the summer of 2022. All samples were analyzed by the U.S. Geological Survey contract laboratory, SGS Labs. Major, minor, and trace elements were determined via wavelength dispersive X-ray fluorescence (WDXRF), inductively coupled plasma-optical emission spectrometry (ICP-OES) and inductively coupled plasma-mass spectrometry (ICP-MS). Additional analytes determined were carbonate carbon by combustion and infrared detection (IR); gold, platinum, and palladium by lead fusion fire...
This publication is a preliminary map and geodatabase of the coseismic surface rupture and other coseismic features generated from the August 9, 2020, Mw 5.1 earthquake near Sparta, North Carolina. Geologic mapping facilitated by analysis of post-earthquake quality level 0 to 1 lidar, document the coseismic surface rupture, named the Little River fault, and other coseismic features. The Little River fault is traced for approximately 4 kilometers and cuts the regional Paleozoic fabric (mean foliation, 063°/57°), and the dominant strike of joint sets are 0°–10°, 130°–150° and 320°–340°. Individual fault strands occur in an en echelon pattern within an approximately 10-meter-wide zone. Trenches across the Little River...
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. Saturated density is the mass per unit volume measured when the sample is saturated with fresh water, which has a density of 1,000 kg/m^3. The two values are commonly compared in order to determine the porosity of a sample, that is, the percentage of the volume that is composed of open space. Density is commonly reported in kilograms...
Categories: Data;
Types: Citation;
Tags: Arroyo Seco,
Cerro Negro,
Cerro de la Olla,
Cerro de los Taoses,
El Rito,
View north toward Snap Point and Snap Point basalt flow, upper Grand Wash Cliffs, from Sanup Plateau. K-Ar age is 9.07±0.8 million years (Ma) (Billingsley and Wellmeyer, 2003).
View west toward dry waterfall of Prospect Canyon drainage over Pleistocene lake sediments and basalt flows of lower Prospect Canyon. One mile south of river mile 180.0.
Aerial view south toward Quaternary pyroclastic dike of Hundred and Fiftynine Mile Vent in Manakacha Formation, south of and above river mile 159.7.
View northwest toward Prospect Canyon volcano (photograph CI42) on west side of lower Prospect Canyon from Toroweap Fault on east rim of lower Prospect Canyon, about a half mile south of river mile 180.0.
View northwest toward Mount Emma volcano and various Pleistocene basalt flows that flowed into Toroweap Valley, west side of Toroweap Valley from the National Park Service Toroweap Ranger Station. Strata include Kaibab Formation (upper cliff) and Toroweap Formation (upper slope, and lower cliff); valley floor is Pleistocene and recent sediment and gravel.
Mysterious cross on basalt at Witch Pool, west side of upper Toroweap Valley.
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