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GEOLOGIC CROSS-SECTION OF THE CORDILLERA DE LOS ANDES AT ABOUT PARALLEL 33° L.S. (ARGENTINA-CHILE)

1950; Geological Society of America; Volume: 61; Issue: 1 Linguagem: Inglês

10.1130/0016-7606(1950)61[17

1943-2674

FÉLIX GONZÁLES BONORINO,

Geological and Geochemical Analysis

Research Article| January 01, 1950 GEOLOGIC CROSS-SECTION OF THE CORDILLERA DE LOS ANDES AT ABOUT PARALLEL 33° L.S. (ARGENTINA-CHILE) FÉLIX GONZÁLES BONORINO FÉLIX GONZÁLES BONORINO DIRECCIÓN DE GEOLOGÍA, DIRECCIÓN GENERAL DE INDUSTRIA MINERA, BUENOS AIRES, ARGENTINA. Search for other works by this author on: GSW Google Scholar Author and Article Information FÉLIX GONZÁLES BONORINO DIRECCIÓN DE GEOLOGÍA, DIRECCIÓN GENERAL DE INDUSTRIA MINERA, BUENOS AIRES, ARGENTINA. Publisher: Geological Society of America Received: 10 Dec 1948 First Online: 02 Mar 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 Copyright © 1950, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1950) 61 (1): 17–26. https://doi.org/10.1130/0016-7606(1950)61[17:GCOTCD]2.0.CO;2 Article history Received: 10 Dec 1948 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation FÉLIX GONZÁLES BONORINO; GEOLOGIC CROSS-SECTION OF THE CORDILLERA DE LOS ANDES AT ABOUT PARALLEL 33° L.S. (ARGENTINA-CHILE). GSA Bulletin 1950;; 61 (1): 17–26. doi: https://doi.org/10.1130/0016-7606(1950)61[17:GCOTCD]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract A profile across the Cordillera de los Andes between Villavicencio, Mendoza, Argentina, and Los Andes, Chile, shows the following stratigraphic units: (1) A basement complex composed of strongly folded beds of graywackes and slaty shales, Palaeozoic in age, slightly metamorphosed by stocks of granodiorite not younger than Middle Triassic; (2) A complex of strongly consolidated pyroclastics, intruded by large laccolithic bodies of quartz-porphyry and dikes and sills of andesites, diabase, etc. Age: Late (?) Triassic; (3) A marine series, ranging from Upper Liassic to Lower Cretaceous, formed by limestones, sandstones, anhydrite (gypsum), tuffites, shales, and conglomerates; sills and dikes of dacite, and andesite porphyries and diabase are common; (4) A thick complex of pyroclastic rocks of andesitic composition, largely breccias, traversed by dikes and sills of andesitic or dioritic rocks; partly intercalated in the upper part of the marine series. Age: Neocomian to Late Cretaceous. (5) Conglomerates and sandstones of Tertiary age. The units 2, 3, and 4 are roughly conformable with each other, and rest unconformably on 1. Unit 5 is unconformable with respect to all. The structure is characterized by a large flexure, the monoclinal part of it being parallel to and broadly coincident with the International boundary. A thrust fault transects the monocline near the base, whereby the Mesozoic beds rest partly on Tertiary conglomerates; another thrust fault marks the limit of the Cordillera to the east. The sequence of events is as follows: (1) deposition of the sedimentary-pyroclastic Mesozoic complex over an irregular peneplain of Palaeozoic rocks; (2) flexuring in the Early (?) Tertiary; (3) erosion and deposition of conglomerates and sandstones; (4) thrusting (Late Tertiary); (5) uplifting and erosion. The loftiest peak of the Cordillera, the Aconcagua (ca. 23,300 ft.), located about 20 kilometers north of our profile along the boundary, is made up of breccias belonging to unit 4 (Porphyritic formation) and structurally forms part of the huge cuesta that carries the frontier line. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.