Map of metallic mining districts and mineral deposit types in Chihuahua, Mexico

Staude, John-Mark G.

doi:10.3133/ofr93718

Cited by 2 publications

(5 citation statements)

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“…Of the Ͼ800 middle Tertiary volcanicrock-hosted epithermal precious-metal occurrences known in northwestern Mexico ( Fig. 9C; Leonard, 1989;Orris et al, 1993;Staude, 1993b), the majority are quartz Ϯ calcite veins with chlorite ϩ adularia ϩ sericite alteration halos. These deposits, such as at Ocampo (Knowling, 1977) and Maguarichic (Staude, 1995), are Ag dominated with spotty Au and base-metal pockets.…”

Section: Middle Tertiarymentioning

confidence: 99%

Jurassic to Holocene tectonics, magmatism, and metallogeny of northwestern Mexico

Staude

Barton

2001

Geological Society of America Bulletin

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The present metallic distribution in northwestern Mexico is the culmination of superposed magmatism, tectonism, erosion, and burial over more than 150 m.y. Detailed palinspastic reconstructions of preextensional configurations-the first study of its kind for this region-clarify the interplay among these features on the present distribution and character of mineralized geologic systems. This new synthesis goes beyond previous metallogenic investigations of northwestern Mexico by separating events into specific timing and structural relationships, and by restoring the geology to its preextensional configuration. Metallogenic factors such as enrichment, preservation, and erosion play major roles in the present distributions and for the first time are related to the overall metallogenic framework of northwestern Mexico. The analysis concludes that modern metallogenic patterns are the result of the complex superposition and subsequent redistribution of geologic systems in a way that is related directly to the regional history, rather than simply metallic belts or interpreted angle of a subducting slab. Three main extensional events in the Oligocene-Holocene have been restored, and the palinspastic distributions have been analyzed. Reconstructions reveal the following: (1) Mineralization events, igneous centers, and sedimentary sequences are continuous across the Gulf of California and other areas with large amounts of extension. (2) Middle Tertiary gold-silver mineralization in Baja California may be the western part of the Sierra Madre Oc

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Section: Middle Tertiarymentioning

confidence: 99%

Jurassic to Holocene tectonics, magmatism, and metallogeny of northwestern Mexico

Staude

Barton

2001

Geological Society of America Bulletin

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“…In the vicinity of the studied deposits of agate, polymetallic Pb-Zn-Ag-Cu deposits are mainly found, but isolated uranium and manganese deposits also occur [40]. Most of these deposits are related to Cretaceous sediments or directly to the volcanic rock units [40,61]. The fluid origin of polymetallic deposits has not been conclusively determined.…”

Section: Agate Formation Processmentioning

confidence: 94%

“…High contents (up to 9500 ppm [42]) have been thus far detected mainly in SiO 2 mineralization, which is spatially as well as genetically bound to chromium-bearing, ultramafic rocks or chromium deposits [43]. No association between the high chromium content and chromiferous rocks or deposits was found in the Chihuahua area [5,40]. However, this lack of association occurs in other localities as well.…”

Section: Origin Of Silica For Agate Formationmentioning

confidence: 96%

“…The Sb content of quartz, as a result of its lack of correlation with other trace elements, is apparently determined solely by the content of antimony in the fluid [36][37][38][39]. No economically relevant antimony deposits are yet known within the Sierra del Gallego area [40]. In the frequently occurring Pb-Zn-Ag-Cu deposits in the state of Chihuahua, however, high amounts of Sb, which occurs primarily in galena and replaces lead with coupled substitution together with silver [41], were detected.…”

Section: Origin Of Silica For Agate Formationmentioning

confidence: 99%

“…The state of Chihuahua is one of the most deposit-and mineral-rich states in Mexico, and several (hydrothermal) ore deposits are known to exist in the area of Sierra del Gallego [61]. In the vicinity of the studied deposits of agate, polymetallic Pb-Zn-Ag-Cu deposits are mainly found, but isolated uranium and manganese deposits also occur [40]. Most of these deposits are related to Cretaceous sediments or directly to the volcanic rock units [40,61].…”

Section: Agate Formation Processmentioning

confidence: 99%

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Mineralogy, Geochemistry, and Genesis of Agates from Chihuahua, Northern Mexico

Mrozik,

Götze,

Pan

et al. 2023

Minerals

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The present study aimed to investigate the genesis and characteristics of some of the world-famous agate deposits in the state of Chihuahua, Mexico (Rancho Coyamito, Ojo Laguna, Moctezuma, Huevos del Diablo, Agua Nueva). Geochemical and textural studies of host rocks showed that all the studied deposits are related to the same rock type within the geological unit of Rancho el Agate andesite, a quartz-free latite that shows clear indications of magma mixing. As a result of their large-scale distribution and various differentiation processes, as well as transport separation, different textures and local chemical differences between rocks of different localities can be observed. These differences have also influenced the properties of SiO2 mineralization in the rocks. The mixing of near-surface fluids from rock alterations with magmatic hydrothermal solutions led to the accumulation of various elements in the SiO2 matrix of the agates, which were, on the one hand, mobilized during secondary rock alteration (Fe, U, Ca, K, Al, Si) and, on the other hand, transported with magmatic fluids (Zn, Sb, Si, Zr, Cr). Different generations of chalcedony indicate a multi-stage formation as well as multiple cycles of filling the cavities with fluids. The hydrothermal fluids are presumably related to the residual solutions of a rhyolitic volcanism, which followed the latitic extrusions in the area and probably caused the formation of polymetallic ore deposits in the Chihuahua area. The enrichment of highly immobile elements indicates the involvement of volatile fluids in the agate formation. The vivid colors of the agates are almost exclusively due to various mineral inclusions, which consist mainly of iron compounds.

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Map of metallic mining districts and mineral deposit types in Chihuahua, Mexico

Cited by 2 publications

References 0 publications

Jurassic to Holocene tectonics, magmatism, and metallogeny of northwestern Mexico

Jurassic to Holocene tectonics, magmatism, and metallogeny of northwestern Mexico

Mineralogy, Geochemistry, and Genesis of Agates from Chihuahua, Northern Mexico

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