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Title: Geologic Map of the Organ Mountains and Southern San Andres Mountain Range, NM


This is a digitized geologic map, in shapefile format, including rock unit lithological descriptions, faults, and dikes.

Publication Date:
Research Org.:
DOE Geothermal Data Repository; Energy and Geoscience Institute at the University of Utah
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Program (EE-2C)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Data Type:
Specialized Mix
Country of Publication:
United States
15 Geothermal Energy; geology; new mexico; map; faults; san andres; organ mountains; dikes; lithology; geologic layer; geologic map; stratigraphy; shape file; shapefile; ArcGIS; GIS; geospatial

Citation Formats

Nash, Greg, and Seager, William. Geologic Map of the Organ Mountains and Southern San Andres Mountain Range, NM. United States: N. p., 2017. Web. doi:10.15121/1364773.
Nash, Greg, & Seager, William. Geologic Map of the Organ Mountains and Southern San Andres Mountain Range, NM. United States. doi:10.15121/1364773.
Nash, Greg, and Seager, William. 2017. "Geologic Map of the Organ Mountains and Southern San Andres Mountain Range, NM". United States. doi:10.15121/1364773.
title = {Geologic Map of the Organ Mountains and Southern San Andres Mountain Range, NM},
author = {Nash, Greg and Seager, William},
abstractNote = {This is a digitized geologic map, in shapefile format, including rock unit lithological descriptions, faults, and dikes.},
doi = {10.15121/1364773},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 6


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  • The Rio Bonito Member of the San Andres Formation records a transgression of the northwestern shelf during the late Leonardian. Late Leonardian to Guadalupian marine carbonates exposed in the Sacramento Mountains relate a marked change from equatorial tidal flat rocks of the middle Leonardian Yeso Formation. These rocks were deposited during a worldwide sea level lowstand. The Yeso-San Andres contact, previously thought to be a gradational boundary, is here interpreted as a flooding surface resulting from the eustatic sea level rise after the lowstand. Inundation of the northwestern shelf led to deposition of the thick Andres Formation marine limestone sequencemore » within a shallow-lagoon or shelf setting. Depositional environments are predominantly subtidal and intertidal. Microfacies include packstones of comminuted bioclasts of normal saline affinities redistributed by light currents. These shoal upward at times to Dasycladacean algal grainstones interpreted as tidal bars prograding across the lagoon or shelf. More restricted wackestones and laminated mudstones occur at the base of the section and indicate a transition from tidal flat to submerged shelf. Aggradation of sediment into the intertidal zone may have occurred cyclically during San Andres deposition. One such cycle is present over the interval exposed in the Sacramento Mountains. Intertidal rocks resemble tidal flat deposits of dolostone, carbonate mudstones, and a thin tongue of quartzarenite interpeted to be Glorieta Sandstone. These rocks were previously attributed to interginguing of the Yeso with the San Andres.« less
  • More than 10 coal beds of Pennsylvanian age crop out around Sand Mountain and Lookout Mountain in Georgia, Tennessee, and Alabama. These beds were deposited in barrier and fluvial environments. Few determinations of modern coal-quality data have been made for these coals, although they have been mined for more than 100 years. To evaluate their quality, 47 coal samples from beds 1, 2, 3, 4, 5, 5A, 6, 8, 9, 9A, and 10 were analyzed for ultimate and proximate values, calorific values, forms of sulfur, ash-fusion temperatures, free-swelling indices, and 60 major and minor, and trace-element concentrations. Most samples havemore » less than 1% total sulfur and have low pyritic and organic sulfur contents. The ash content has geometric mean value of about 8%. The mean calorific value is just above 13,000; some samples have values above 15,000 Btu. The calculated coal rank ranges from low to medium volatile bituminous. However, the rank reverses in the Lookout Mountain coal, suggesting possible tectonic intervention. Because of high free-swelling indices and low concentrations of volatiles, sulfur, and as, most of these coal beds contain premium quality metallurgical or metallurgical-blend coal. In some coal beds, the concentrations of CaO, Na/sub 2/O, P/sub 2/O/sub 5/, MgO, and chlorine show wide differences from the overall geometric mean, indicating changing deposition or tectonic conditions. The geometric mean concentrations of minor and trace lithophile elements do not display large differences when compared to other eastern US bituminous coal samples. Chalcophile elements such as silver, arsenic, cobalt, mercury, selenium, and zinc are present in concentrations that may be related to depositional or diagenetic processes. Antimony content is high in some samples.« less
  • The Franklin Mountains are a west tilted fault block mountain range which extends northwards from the city of El Paso, Texas. Geologic mapping in the southern portion of the Franklin Mountains has revealed many previously unrecognized structural complexities. Three large high-angle faults define the boundaries of map. Twenty lithologic units are present in the field area, including the southernmost Precambrian meta-sedimentary rocks in the Franklin Mountains (Lanoria Quartzite and Thunderbird group conglomerates). The area is dominated by Precambrian igneous rocks and lower Paleozoic carbonates, but Cenozoic ( ) intrusions are also recognized. Thin sections and rock slabs were used tomore » describe and identify many of the lithologic units. The Franklin Mountains are often referred to as a simple fault block mountain range related to the Rio Grande Rift. Three critical regions within the study area show that these mountains contain structural complexities. In critical area one, Precambrian granites and rhyolites are structurally juxtaposed, and several faults bisecting the area affect the Precambrian/Paleozoic fault contact. Critical area two contains multiple NNW-trending faults, three sills and a possible landslide. This area also shows depositional features related to an island of Precambrian rock exposed during deposition of the lower Paleozoic rocks. Critical area three contains numerous small faults which generally trend NNE. They appear to be splays off of one of the major faults bounding the area. Cenozoic kaolinite sills and mafic intrusion have filled many of the fault zones.« less
  • South-central Arizona is generally believed to have been cratonic throughout Paleozoic time and part of a continental magmatic arc during the Mesozoic Era, yet the compositions of, and relict sedimentary structures in, some of the metamorphic rocks of the southern Baboquivari Mountains suggest that a marine environment existed for at least part of the Early Jurassic period. Metamorphosed from Early Jurassic protoliths, these rocks include abundant quartzo-feldspathic schists, calc-silicate schists, and metarhyolite, common finely cross-bedded quartzite interlayered with marble, subordinate metaconglomerate and metabasite, minor piemontite and spessartine bearing schists and granofels, and minor stratiform tourmalinite which may exhibit detrital sedimentarymore » features. Marble, Mn- bearing rocks, and tourmalinite have not been noted by other workers in rocks of similar age in the northern Baboquivaris, which have been interpreted as part of a continental magmatic arc. Five generations of structures have been identified in the field: 1) Rootless fold hings of varying orientation suggest an early period of deformation, 2) Pervasive schistosity and mineral lineation associated with isoclinal folding and greenschist-lower amphibolite facies metamorphism have led to extreme transposition of bedding; deformation and metamorphism increase with proximity, and are apparently related, to the Baboquivari Thrust Fault, a major thrust emplacing Jurassic plutonic rocks over the metamorphic rocks described above, 3) Locally developed post metamorphic crenulation lineation and cleavage are generally associated with small, open, upright folds in the older foliation, 4) All older features are locally deformed about the latest Cretaceous-early Tertiary garnet two-mica Presumido Peak Granite, and 5) metamorphic core complex type deformation has affected the Presumido Peak Granite near the border with Mexico.« less