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Vipos, Trancas Department, Tucumán Province, Argentinai
Regional Level Types
Vipos- not defined -
Trancas DepartmentDepartment
Tucumán ProvinceProvince
ArgentinaCountry

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Key
Latitude & Longitude (WGS84):
26° 28' 23'' South , 65° 20' 52'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Trancas6,658 (2015)29.3km
Tafí Viejo48,459 (2016)30.1km
Yerba Buena50,783 (2016)38.3km
San Miguel de Tucumán781,023 (2016)41.0km
Alderetes38,466 (2016)43.7km


Gypsum deposit:
History: Gypsum in Tucuman is located within the stratigraphic column, in the upper strata of tertiary, usually accompanying the oolitic limestone, interacting with clayey sediments of color greenish-Brown.
Are presented in various varieties, such as fibrous concrecionales robes and partially crystallized type Selenite, sacaroide (Alabaster), etc...
The Tertiary of Tucumán presents the clay series that totals 11 bitumen, cineritas, marl, limestone and sandstones, interbedded with gypsum and limestone.
Gypsum banks reach thicknesses variables, coming in part to occur more than 1 meter.
Vipos Gypsum is interspersed in a Brown arcillita, which has certain desiccation cracks by where there are eflorecences of sodium sulfate (Mirabilite) in radiated groupings. The Selenite fill the subglacial of stratification of sediments in the form of thin slices.
In the area of Vipos, gypsum is presented in masse in the Brown Clay, with a variety of fine grain medium and fibrous, being exploited today for supply of cement factories.
Chemical analysis of gypsum Vipos:
Silicon dioxide (SiO2): 7.46 g.%
Calcium sulfate (SO4Ca.2H2O): 84.28 g.%
Ferric oxides and aluminous ((Fe2O3 - Al2O3): 5.20 g.%
Indeterminate: 3.06 g.%

Mirabilite-Thenardite:
This sodium sulfate was presented in an outcrop of some centimeters, in the best of cases reaching 30 centimeters or more in the town of Vipos in the Trancas Department in the form of patches, powder of white color on the surface, filling the cracks, especially marginal clay material.
This sulfate in contact with the foreign present efflorescence and pervades the sediment in the form of white powder, being common in the green-brown clay of training, especially in the winter time.
The Mirabilite appears in a small Anticline near vertex Northwest to form the intersection of the Vipos River and the railway bridge, at distance 440 meters and direction on ground North - West 1.25 degrees and 790 m above sea level, of this point. The formation is represented by the upper part of the Tertiary, characterized by the presence of clay material from Brown and greenish, appear interspersed some banks of Gypsum in the brown clay especially.
As already mentioned the Mirabilite appears in the crevices of the material clay in the form of radiated and needle-like groupings. In contact with the surface these efflorescence concentrations and they permeate the sediment of a white powder.
The presence of Thenardite as efflorescence on Gypsum and Clay is the product of dehydration of the Mirabilite which is dehydrated to Thenardite in dry air.

Chemical analysis of Vipos Mirabilite:
Sulphuric Acid (-SO3): 24.803%
Sodium Oxide (Na2O): 18.590%
Calcium Oxide (CaO): 0.163%
Water (H2O): 55.034%
Insoluble residue in water: 1.474%

The exact coordinates of the Anticline are:
Latitude: 26º 28´ 06" S.
Longitude: 65º 20´ 49" W.
Altitude: 790 m. above sea level.

Geodes:
Sediment tertiary faults are geodes with boulders of sandstone, quartz and basic vulcanites. The geodes grow to 10 cm although in general they are between 3 and 6 cm in diameter. There are two varieties, one of coarse-grained and microcrystalline. In the variety of coarse-grained quartz is transparent and well crystallized with Prism completed in combination of romboedros although some specimens has not developed the Prism. The crystals are between 2 and 4 mm and is impantan in bands of microcrystalline quartz of bluish gray to gray color of 2 to 3 mm thick. In microcrystalline varieties texture is botrioidal and concentric bands of white, white colors grey and dark blue to black. Internally there may be small crystals.

Cinerite:
Cineritic material forming robes, is located in the Vipos area, about 2 kilometers south of the local railroad station next to the same tracks. The area was visited in the 1960s being able to verify that this Cinerite is interspersed in despicable and partly Sandy silty material cloaks. You could count up to 6 sheets with an average thickness of 0.20 to 0.25 meters. Macroscopically is white, in parts quite pure and sometimes something gritty, with abundant lamellae of mica and gypsum sandwiched. Outliers have little visible expansion and an inclination which would oblige certain scale for a farm work.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

4 valid minerals.

Detailed Mineral List:

'Chlorite Group'
Reference: Peña, H. A. (1970). Minerales y rocas de aplicación de la Provincia de Tucumán. Secretaría de Estado de Comercio, Industria y Minería. Dirección Provincial de Minas. Tucumán.
Gypsum
Formula: CaSO4 · 2H2O
Reference: Hugo A. Peña (1979) - Minerales y Rocas de Aplicación de la Provincia de Tucumán. Dirección Provincial de Minas. Tucumán.
Gypsum var: Selenite
Formula: CaSO4 · 2H2O
Reference: Juan C. Porto (1961) - "Yeso y Sulfatos Alcalinos en Vipos". Tucumán. Instituto Miguel Lillo. Universidad Nacional de Tucumán. Inédito.
Mirabilite
Formula: Na2SO4 · 10H2O
Reference: Hugo A. Peña (1979) - Minerales y Rocas de Aplicación de la Provincia de Tucumán. Dirección Provincial de Minas. Tucumán.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Peña, H. A. (1970). Minerales y rocas de aplicación de la Provincia de Tucumán. Secretaría de Estado de Comercio, Industria y Minería. Dirección Provincial de Minas. Tucumán.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Peña, H. A. (1970). Minerales y rocas de aplicación de la Provincia de Tucumán. Secretaría de Estado de Comercio, Industria y Minería. Dirección Provincial de Minas. Tucumán.
Quartz
Formula: SiO2
Reference: Raúl Joreg Tauber Larry
'Thénardite'
Formula: Na2SO4
Reference: Raúl Jorge Tauber Larry

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Gypsum7.CD.40CaSO4 · 2H2O
var: Selenite7.CD.40CaSO4 · 2H2O
Mirabilite7.CD.10Na2SO4 · 10H2O
'Thénardite'7.AC.25Na2SO4
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
A2XO4
'Thénardite'28.2.3.1Na2SO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
A2XO4·xH2O
Mirabilite29.2.2.1Na2SO4 · 10H2O
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
Gypsum
var: Selenite
-CaSO4 · 2H2O
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H GypsumCaSO4 · 2H2O
H MirabiliteNa2SO4 · 10H2O
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Gypsum (var: Selenite)CaSO4 · 2H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
OOxygen
O ThénarditeNa2SO4
O GypsumCaSO4 · 2H2O
O MirabiliteNa2SO4 · 10H2O
O QuartzSiO2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Gypsum (var: Selenite)CaSO4 · 2H2O
O MuscoviteKAl2(AlSi3O10)(OH)2
NaSodium
Na ThénarditeNa2SO4
Na MirabiliteNa2SO4 · 10H2O
AlAluminium
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si QuartzSiO2
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S ThénarditeNa2SO4
S GypsumCaSO4 · 2H2O
S MirabiliteNa2SO4 · 10H2O
S Gypsum (var: Selenite)CaSO4 · 2H2O
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca GypsumCaSO4 · 2H2O
Ca Gypsum (var: Selenite)CaSO4 · 2H2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Juan C. Porto (1961) - "Yeso y Sulfatos Alcalinos en Vipos". Tucumán. Instituto Miguel Lillo. Universidad Nacional de Tucumán. Inédito.
Hugo A. Peña (1979) - Minerales y Rocas de Aplicación de la Provincia de Tucumán. Dirección Provincial de Minas. Tucumán.
Ávila, J.C. y Fogliata, A.S (1992)- Descripción de las geodas de Vipos, provincia de Tucumán. Nota Breve. 1ra Reunión de Mineralogía y Metalogenia y 1ra Jornada de Mineralogía, Petrografía y Metalogénesis de Rocas Ultrabásicas. Instituto de Recursos Minerales, UNLP. Publicación 2: 29-34.
Raúl Jorge Tauber Larry (2012). Informe Personal.

Localities in this Region

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