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Loma Chata, Quebrada del Arroyo Sauce Mayo, Sierra de La Ramada, Burruyacú Department, Tucumán, Argentina

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Name(s) in local language(s): Loma Chata, Quebrada del Arroyo Sauce Mayo, Sierra de La Ramada, Departamento Burruyacú, Provincia de Tucumán, Argentina
Elevation: 719 m. above sea level.

Geological history:
In the Quebrada del Arroyo Sauce Mayo, in the spot known as "Loma Chata", on the South-eastern slope of the saw the Ramada, emerges a basaltic olivinic, whose Petrology, composition body geochemistry and relationship with other basaltic bodies linked to the depositional history Group Salta in the Argentine Northwest. You can access the area of mineralization from the city of San Miguel de Tucuman provincial No. 304 route up the city of La Ramada and thence towards the West by a private road that leads to the mouth of the stream above. Body, grayish brown to black, is located in the basal levels of the Pirgua subgroup and exhibits disjunction columnar on both banks of the Creek, forming deep cliffs from the foot of saw up to 50 m upstream from the confluence of the Alpasorcones and Sauce Mayo creeks. Presents a hipidiomorphic porphyritic texture and holocrystaline, with a paste microcrystaline composed of small individuals of augite and plagioclase, zeolites, where is inserso microphenocrystals of olivine as individuallyduos euhedrales to subhedrales, rusty or theterados zeolites and sheets of biotite and mineopaque General mostly euhedrales, consequentialfrequency of the oxidation of the pyroxenes. Disglobal irregularly, zeolite and calcite in lesser proportion vesicles were observed. The the plagioclase and clinopyroxene are presented in small proportion as microliths, resulting not possible to determine the composition of the feldspar.Studied basalts would be related to other outcrops in the province of Tucumán, in the towns of El Cadillal and Cumbres del Periquillo, as dated by the K/Ar method yielded ages of 128 to 97 million years for the complex high vulcanites of Las Salinas, the El Cadillal training, and 111 ± 5 million years to the bajump olivinic of Cumbres del Periquillo. Also would be equivalent to the volcanobasic training tas the high on the northern slope of the sierra de La Ramada.
Recent studies carried out jointly with the National University of Salta, Anomalitaron they analyze the geochemistry of the basalts of Sauce Mayo, classifying them as alkali basalts and volcanism.These observations are consistent with the made for the basal exuberance of the Pirgua subgroup. Also well correspond to the vulcanites of the first effusive cycle of the Salta group. Regarding their origin, are considered movements responsible for the for snowing information systems of tensional fractures submeridionales, why extruyeron queuedas basaltic related especially to the base of the Pirgua subgroup. Volcanism is would have developed in a marginal position along the edges of the dorsal Salta-Jujuy and arc Pampeano.

Primary mineralization:
Olivine - Augite - plagioclase – pyroxenes (clinopyroxene) - zeolites - Biotite - calcite.

Mineral List

9 entries listed. 4 valid minerals.

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Carlos M. Falcón, LOS BASALTOS OLIVÍNICOS DEL EXTREMO AUSTRAL DE LA SIERRA DE LA RAMADA,PROVINCIA DE TUCUMÁN. Cátedra de Geología de Combustibles. INSUGEO.Facultad de Ciencias Naturales e Instituto Miguel Lillo. Miguel Lillo 205. 4000. Tucumán,Argentina.falcon@csnat.unt.edu.ar

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