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Hoja Geológica 3766-IV General Acha Provincia De La Pampa Programa Nacional de Cartas Geológicas de la República Argentina 1:250.000 Hoja Geológica 3766-IV General Acha Provincia de La Pampa Diego G. Silva Nieto, Patricia M. Espejo, Carlos J. Chernicoff y Eduardo O. Zappettini Supervisión: Mario Franchi Normas, dirección y supervisión del Instituto de Geología y Recursos Minerales SERVICIO GEOLÓGICO MINERO ARGENTINO INSTITUTO DE GEOLOGÍA Y RECURSOS MINERALES Boletín Nº 427 Buenos Aires - 2017 SERVICIO GEOLÓGICO MINERO ARGENTINO Presidente: Geól. Julio Ríos Gómez Secretario Ejecutivo: Lic. Carlos G. Cuburu INSTITUTO DE GEOLOGÍA Y RECURSOS MINERALES Director: Dr. Eduardo O. Zappettini DIRECCIÓN DE GEOLOGÍA REGIONAL Director: Lic. José E. Mendía REFERENCIA BIBLIOGRÁFICA Esta publicación debe citarse como: SILVA NIETO, D., P. M. ESPEJO, C. J. CHERNICOFF y E. O. ZAPPETTINI, 2017. Hoja Geológica 3766-IV, General Acha. Provincia de La Pampa. Instituto de Geología y Recursos Minerales, Servicio Geológico Minero Argentino. Boletín 427, 52pp., Buenos Aires. ISSN 0328-2333 ES PROPIEDAD DEL INSTITUTO DE GEOLOGÍA Y RECURSOS MINERALES - SEGEMAR PROHIBIDA SU REPRODUCCIÓN Av. General Paz 5445 (Colectora provincia) 1650 - San Martín - Buenos Aires - República Argentina Edificios 14 y 25 | (11)5670-0100 www.segemar.gov.ar BUENOS AIRES - 2017 CONTENIDO RESUMEN ........................................................................................................ 1 ABSTRACT ........................................................................................................ 1 1.INTRODUCCIÓN ........................................................................................................ 2 UBICACIÓN Y CARACTERÍSTICAS GEOGRÁFICAS .................................................................. 2 NATURALEZA DEL TRABAJO ........................................................................................................ 3 INVESTIGACIONES ANTERIORES.................................................................................................. 3 2.ESTRATIGRAFÍA ........................................................................................................ 4 RELACIONES GENERALES ............................................................................................ 4 BASAMENTO PREMESOZOICO EN LA PROVINCIA DE LA PAMPA ...................................... 6 2.1.NEOPROTEROZOICO-CÁMBRICO INFERIOR ............................................................ 6 2.1.1.EDIACÁRICO-CÁMBRICO INFERIOR ................................................................ 6 Esquistos Santa Helena (1) ........................................................................................... 6 Formación Las Piedras (2)............................................................................................ 8 2.2.PALEOZOICO ........................................................................................................ 8 2.2.1.CÁMBRICO INFERIOR ........................................................................................... 8 Complejo Ígneo El Carancho (3)................................................................................... 8 2.2.2.ORDOVÍCICO ........................................................................................................ 9 Formación Paso del Bote (4) ........................................................................................ 9 Formación Valle Daza (5) ............................................................................................. 10 2.2.3.ORDOVÍCICO SUPERIOR-DEVÓNICO ............................................................... 12 Formación La Horqueta (6) .......................................................................................... 12 2.2.4.DEVÓNICO ........................................................................................................ 13 Formación Curacó (7) ................................................................................................... 13 2.2.5.PÉRMICO ........................................................................................................ 14 Formación Arizona (8) .................................................................................................. 14 2.3.PALEOZOICO-MESOZOICO ............................................................................................ 15 2.3.1.PÉRMICO -TRIÁSICO ............................................................................................. 15 GRUPO LIHUÉ CALEL ............................................................................................. 15 Formación El Centinela (9) .................................................................................... 15 Formación Choique Mahuida (10) ......................................................................... 16 Formación Zúñiga (11) ........................................................................................... 17 2.4.MESOZOICO ........................................................................................................ 19 2.4.1.¿CRETÁCICO? ........................................................................................................ 19 Basaltos cretácicos (?) (12) .......................................................................................... 19 2.5.CENOZOICO ........................................................................................................ 21 2.5.1.NEÓGENO ........................................................................................................ 21 2.5.1.1.MIOCENO SUPERIOR .................................................................................. 21 Formación Cerro Azul (13) .................................................................................... 21 2.5.2.NEÓGENO-CUATERNARIO .................................................................................. 24 2.5.2.1.PLIOCENO INFERIOR - PLEISTOCENO ............................................ 24 Calcretes con cobertura eólica (14I, 14II)...................................................... 24 2.5.3.CUATERNARIO........................................................................................................ 29 2.5.3.1.PLEISTOCENO – HOLOCENO .................................................................... 29 Sedimentos fluviolacustres del río Chadileuvú (15)................................................ 29 Formación Meaucó (16) ........................................................................................ 30 Depósitos aluviales sobre superficies pedimentadas (17) ...................................... 32 2.5.3.2.HOLOCENO .................................................................................................... 32 Depósitos coluviales indiferenciados (18) .............................................................. 32 Depósitos aluviales (19) ......................................................................................... 32 Depósitos finos de bajos y lagunas (20) ................................................................. 32 3.ESTRUCTURA ........................................................................................................ 33 Estructura del basamento ........................................................................................................33 4.GEOMORFOLOGÍA ........................................................................................................ 36 Planicie estructural disectada ...................................................................................................... 36 Planicie arenosa eólica ........................................................................................................ 37 Serranías ........................................................................................................ 37 Valle del Chadileuvú ........................................................................................................ 38 5.HISTORIA GEOLÓGICA ........................................................................................................ 39 6.RECURSOS MINERALES ........................................................................................................ 40 6.1.DEPÓSITOS DE MINERALES METALÍFEROS ............................................................. 40 Níquel – Platino diseminado ................................................................................................. 40 6.2.DEPÓSITOS DE MINERALES INDUSTRIALES............................................................ 40 Cuarzo ........................................................................................................ 40 Sulfato de sodio ........................................................................................................ 40 6.3.DEPÓSITOS DE ROCAS DE APLICACIÓN ................................................................... 41 Andesitas ........................................................................................................ 41 Cantera Lihué Calel ...................................................................................................... 41 Pegmatitas ........................................................................................................ 42 Granito ........................................................................................................ 42 Tosca ........................................................................................................ 42 7.RECURSOS HÍDRICOS .......................................................................................................
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