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Sierrita Mts, Pima Co., Arizona, USA
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Latitude: 31°52'40"N
Longitude: 111°11'40"W
 
 
Ref.: Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, Arizona Bureau of Mines Bull. 156: 42-43.

MRDS database Dep. ID file #10161696, MAS ID #0040190558.

The structure of the Sierrita Mountains has been complicated by folds overturns, low-angle faults, and steeply dipping falts. Much of it remains obscure and unknown. Some of the structures localized emplacement of the igneous intrusions and deposition of the ores. Some post-ore faulting has taken place.

In Mineral Hill faulted Paleozoic beds dip steeply southwestward, with older beds above younger. This block may be interpreted as one limb of a southeastward-trending, overturned fold, or it may be a remnant of a thrust-fault slice.

Helmet Peak consists of Snyder Hill limestone, bounded on the NE by down-faulted red beds and on the SW by shaly and arkosic beds of uncertain structural relation. Galbraith reports that the imestone of the peak shows a closely compressed anticline plunging southeastward.

Flexures are evident in the hill west of the San Xavier Extension Mine. Some unrecognized large folds may be present, as suggested by the wide variation in dips of beds in the Twin Buttes area.

As interpreted by Mayuga, the sedimentary rocks in the Mineral Hill, San Xavier, and Olive Camp areas rest upon the intrusive granite. Fault planes and breccia exposed above the granite indicate the contact to be a low-angle fault zone of general eastward dip. his fault zone may have localized the granite intrusion, or movement may have occurred along it after the intrusion.

A the San Xavier Extension Mine, Naco Limestone has been faulted over Escabrosa, and the fault contact dips about 25º southeastward. In the Cretaceous area south of the San Xavier Mine, older beds have been thrustover younger beds. In the northern part of Mineral Hill, a block of Escabrosa and Martin limestones has been thrust over Permian and Naco beds. The thrust plane appears to dip NE about 40º.

Steeply dipping fissures are numerous in the district. On the basis of general strike, they may be grouped into NE, NW, and east systems. Some of them have effected displacements of several hundred feet. Faults and fractures of the NE and east systems appear to be most commonly associated with mineralization.

Silver-lead deposits in the San Xavier and other districts of these mountains were known to the Jesuit missionaries and early Spaniards.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Acanthite
Actinolite
Aegirine
'Albite-Anorthite Series'
Allanite-(Ce)
Alunite
Andradite
Anglesite
Anhydrite
Ankerite
Anorthite
var: Labradorite

Antigorite
'Apatite'
'Apophyllite'
Aragonite
'Asbestos'
Atacamite
Aurichalcite
Azurite
Baryte
Bassanite
Beryl
'Biotite'
Bismuth
Bornite
var: Argentiferous Bornite
Brochantite
Calcite
Caledonite
Cerussite
Chalcanthite
Chalcocite
var: Argentiferous Chalcocite
Chalcopyrite
Chlorargyrite
'Chlorite Group'
Chrysocolla
'Clay'
Clinochlore
Connellite
Copiapite
Copper
'Copper Stain'
Coquimbite
Covellite
Cubanite
Cuprite
var: Chalcotrichite
Datolite
Descloizite
Digenite
Diopside
Dolomite
Duftite
Enargite
Epidote
Epsomite
Euxenite-(Y)
Ferrimolybdite
Fluorite
Forsterite
Galena
var: Argentiferous Galena
'Garnet'
Gerhardtite
Goethite
Gold
Goslarite
Grossular
Gypsum
var: Selenite
Hedenbergite
Hematite
var: Specularite
Hemimorphite
'Heulandite'
Jarosite
Kaolinite
Kinoite
Laumontite
'Limonite'
Linarite
Lindgrenite
Magnetite
Malachite
Marcasite
'Medmontite'
Melanterite
Microcline
Molybdenite
'Molybdenite-2H'
Montmorillonite
Mottramite
Muscovite
var: Sericite
Nepheline
Nontronite
Opal
var: Opal-AN
Orthoclase
Palygorskite
Perovskite
Phlogopite
Plumbojarosite
Powellite
Pseudoboleite
'Psilomelane'
Pyrite
Pyrolusite
'Pyroxene Group'
Pyrrhotite
Quartz
var: Jasper
Rhodochrosite
Rhodonite
Riebeckite Root Name
var: Crocidolite

Rosasite
Rutile
Samarskite-(Y)
Sanidine
var: Barium-Sanidine

'Scapolite'
Scheelite
Schorl
Sepiolite
'Serpentine Group'
Siderite
Smithsonite
var: Dry Bone Ore
Sphalerite
var: Marmatite
Stibnite
'Stilbite'
Stringhamite
Sulphur
Talc
Tennantite
Tenorite
Tetrahedrite
var: Argentian Tetrahedrite
Titanite
Topaz
Torbernite
'Tourmaline'
Tremolite
Turquoise
Uraninite
var: Pitchblende
Valleriite
Vanadinite
Vesuvianite
Witherite
Wollastonite
Wulfenite
Zeolite Group
Zoisite


155 entries listed. 120 valid minerals.

Localities in this Region

USA
USA

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