|
NMT Community Archive >
Earth and Environmental Science >
Independent Studies >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/10136/187
|
| Title: | Alteration and Mineralization in the Jarilla Mountains, Otero County, New Mexico |
| Authors: | Jaramillo, Luiz |
| Issue Date: | 1-Dec-2008 |
| Abstract: | Most of the mineral deposits in the Ohaysi Valley area in South-Central New Mexico are products of metasomatism and thermal metamorphism produced by the intrusion of Tertiary igneous masses, varying in composition from syenodiorite to quartz monzonite, into a Paleozoic sedimentary sequence consisting mostly of cherty, calcareous beds and shaly siltstone. Magnetite developed in calcareous beds, adjacent to igneous contacts. Associated with the magnetite is more or less specularite, almost always pyrite, and little chalcopyrite; and ordinary contact silicates including garnet, diopside and minor wollastonite and hornblende. In the hornblende monzonite stock, second stage within the intrusive sequence, hydrothermal alteration has been intense. The intrusive rock is host to zones of potassic, phyllic and argillic-propylitic assemblages. Copper metallization is overlapping the potassic and phyllic zones. Supergene alteration has been superimposed on the preexisting hypogene hydrothermal alteration and makes difficult the interpretation of mineral assemblages in the different alteration zones. Intense oxidation within the potassic and phyllic zones has destroyed hypogene sulfides so an estimation of the distribution of pyrite and chalcopyrite through these zones could not be done. |
| URI: | http://hdl.handle.net/10136/187 |
| Appears in Collections: | Independent Studies
|
Files in This Item:
| File |
Description |
Size | Format |
|---|
| Jaramillo, Luis.pdf | | 7444Kb | Adobe PDF | View/Open |
|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
|
