Geodynamic evolution and tectonostratigraphic terranes of northwestern Argentina and northern Chile

Bahlburg, Heinrich; Hervé, Francisco

doi:10.1130/0016-7606(1997)109<0869:geatto>2.3.co;2

Cited by 222 publications

(147 citation statements)

References 77 publications

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“…There, a largely volcano-sedimentary succession is overlain by an epiclastic deep-water section that partly records postorogenic arc unroofing stages and eastward progradation toward the craton [Bahlburg, 1990[Bahlburg, , 1991Bahlburg and Furlong, 1996]. However, unlike in Famatina, no intense thinand thick-skinned shortening occurred during the Ocloyic orogeny, which only affected the Early Ordovician stratigraphy in the innermost hinterland region (close to the boundary between Argentina and Chile), with no further folding to complicate the primary spatial and stratigraphic relationships within the back arc region and to the east [Bahlburg and Hervé, 1997;Astini, 2003].…”

Section: Precordillera Terrane Accretion and Itsmentioning

confidence: 99%

Ordovician back arc foreland and Ocloyic thrust belt development on the western Gondwana margin as a response to Precordillera terrane accretion

2004

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The Famatina belt, southern central Andes, records a circa 470 m.y. shortening episode (Ocloyic orogeny) affecting the peri‐Gondwanan back arc basin in response to the accretion of the Precordillera terrane. Collision created distinct features across and along the margin, some of which persisted into the present Andean structure. From east to west, the Ocloyic deformation is recorded across the telescoped region of Famatina, represented by (1) an east vergent fold‐thrust belt (EVFTB) involving a major angular unconformity between Early and Middle Ordovician rocks, (2) a highly deformed volcano‐sedimentary belt, and (3) an east vergent ductile shear zone affecting Famatinian granites. Axis attitudes of Ordovician refolded anticlines in the EVFTB show west‐east tectonic transport, in agreement with kinematics of Ocloyic high‐strain belts, indicating shortening orthogonal to the present Pacific margin. Eastward displacement of the Ordovician volcanic arc at ∼27°S latitude together with a documented sinistral slip zone across the proto‐Andean margin suggests tectonic indentation.

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Section: Precordillera Terrane Accretion and Itsmentioning

confidence: 99%

Ordovician back arc foreland and Ocloyic thrust belt development on the western Gondwana margin as a response to Precordillera terrane accretion

2004

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“…No setor andino, por sua vez, as condições de margem passiva também foram predominantes após a orogenia Pampeana (pós-520Ma), destacando-se apenas por um interregno de margem ativa e colisão (Oclóica e/ou Famatiniana no Ordoviciano Superior (-450 Ma. ), segundo Bahlburg & Hervé (1997). A retomada de eventos acrescionários no Carbonífero Superior naquele setor veio encerrar uma quiescência tectônica de cerca de 110 Ma na margem proto-Pacífica.…”

Section: Figura 4 -Esquema Geral (Fora De Escala) Dos Fragmentos De Lunclassified

“…A reconstituição em um linha única e contínua das margens continentais e das formações marinhas do lapetus do Canadá ao sul do Chile, percorrendo preferencialmente tratos do embasamento formados na colagem mesoproterozóica (Grenville, Garzon-Santa Marta, terreno Occidentalia, conforme esquema de Dália Salda et ai 1993), é ousada, de forte apelo, embora não seja de aceitação unânime (vide Hervé & Bahlburg 1997). Dentro deste raciocínio e linha de pensamento, haveria uma fase segunda de fissão, após a orogenia Famatiniana, com a deriva vigorosa de Laurentia que descreveu um roteiro horário em torno da América do Sul (Dalziel 1995).…”

Section: Figura 4 -Esquema Geral (Fora De Escala) Dos Fragmentos De Lunclassified

America Do Sul: Quatro Fusões, Quatro Fissões E O Processo Acrescionário Andino

Neves

1999

RBG

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SOUTH AMERICA: FOUR FUSIONS, FOUR FISSIONSAND THE ANDEAN ACCRECIONARY PROCESSThe aim of this article is try to interpret -as a first approximation-the evolution of the South American continent from the point of view of the Supercontinents Theory of the new Global Tectonics. It is preliminarly reiterated that the individualization of this lithospheric segment as a continent (geotectonic sense) is a fact younger than 100 Ma old, although we know about a crustal evolutionary history -as participant of other continental configurations as older as 3.5 Ga. Most of those previous continental configurations were larger in size than this now presented. Four major processes of (super)continental agglutination are being identified and they will be described, three of them Precambrian in age in the upper part of the Proterozoic eras (Paleoproterozoic, Mesoproterozoic and Neoproterozoic). The last of these agglutination processes took place in Early Mesozoic times, after a long and complex Paleozoic history of accretions and interior collisions. Following each of these agglutinantion events there were wide processes of continental break up (taphrogenesis) and dispersion ( drift) of the descendant lithospheric segments, as result of the dissipation of heat from astenospheric realms. The last process of dispersion, after the Triassic continental collage (Pangea supercontinent) is still under way, in terms of the present grouwth of the Atlantic Ocean. Só, it hás partially been coeval of the concurrent accretionary processes in the Andean Chain, which are somehow leading to a future continental agglutination (when of the disappearance of The Pacific and Caribbean oceanic segments). Such development of these two different and concurrent processes (at the western and eastern margin) is the responsible for the present shape and concept of the continent, which hás to be understood just as a particular instance (and configuration) of an ongoing complex evolutionary trajectory of this continental lithospheric segment.Keywords: fusion, fission, collage, supercontinent, Brasiliano, taphrogenesis RESUMO O objetivo deste artigo é tentar interpretar -em primeira aproximação -a evolução do continente Sul-Americano do ponto de vista da Teoria dos Supercontinentes da nova Tectônica Global. Preliminarmente é reiterado que a individualização deste segmento litosférico como continente (sentido geotectônico) é um fato novo, mais jovem que 100 Ma, ainda que nós saibamos de uma história crustal evolutiva tão velha quanto 3,5 Ga, como participante de outras configurações continentais. A maioria destas configurações continentais prévias foram maiores em dimensões que a atualmente apresentada. Quatro processos maiores de aglutinação (super) continental são identificados e aqui descritos, três deles de idade pré-cambriana, da parte superior das eras do Proterozóico (Paleoproterozóico, Mesoproterozóico e Neoproterozóico). O último destes processos de aglutinação teve lugar no início do Permiano, após uma complexa e longa história de colagens e ...

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“…The AMO was constructed upon a continental crust, as is indicated by isotopic Pb composition from zircons of some of the Ordovician Plutons of Cordón de Lila (Damm et al, 1990). This fact led Bahlburg and Hervé (1997) to consider that the CISL developed upon the Proterozoic basement of the Arequipa-Antofalla Terrane, which in Chile is well exposed in the Sierra de Moreno (Loewy et al, 2004;Griem-Klee and Niemeyer, 2005;GriemKlee and Niemeyer, 2006) and Sierra de Limón Verde (Baeza-Assis, 1984), near Calama (Fig. 8).…”

Section: Paleobiogeographic Significancementioning

confidence: 99%

La Formacion QuebradaGrande, del Ordovicico, Cordon de Lila (Region de Antofagasta, norte de Chile): significado estratigrafico y paleogeografico.

González

Niemeyer

Benedetto

et al. 2007

Andgeo

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The Cordón de Lila is located immediately to the south of the Salar de Atacama, in northern Chile. The geology of the Cordón de Lila is characterized by extensive outcrops of Early Paleozoic volcanic and sedimentary rocks (Cordón de Lila Igneous and Sedimentary Complex; CISL) that form the 'Arco magmático occidental' (AMO) which is intruded by a multiple suite of Middle Ordovician to Lower Silurian granitoids. In this contribution we report the results of a sedimentological and paleontological study of a recently discovered 1,600 m thick marine Ordovician sedimentary sequence (Quebrada Grande Formation) which unconformably overlies the CISL. The Quebrada Grande Formation comprises three mayor facies associations. In stratigrafic order, these facies associations are: matrix-supported conglomerates (1), interbedded sandstones and siltstones (2) and clast-supported conglomerates (3). Facies association (1) is interpreted as debris flow deposits accumulated in a proximal marine fan-delta setting while the overlying sandstones and siltstones facies (2) represent open-marine platform deposits. Clast-supported conglomerates (3) are the record of high-energy sedimentary episodes during which coarse sediments reached the distal part of the fan-delta. The detrital fraction of the Quebrada Grande Formation is derived from the erosion of the Cambrian?-Lower Ordovician? CISL volcanic arc, the plutonic roots of the arc and its continental basement. The age of this formation is well constrained by the occurrence of brachiopods (Paralenorthis sp., Monorthis transversa Benedetto, and Mollesella? sp.) near the base and graptolites (Tetragraptus sp. and Cryptograptus? sp.) towards the middle of the succession. Both brachiopods and graptolites indicate an Arenigian to early Llanvirnian (Darriwilian) age. The brachiopod assemblage from Cordón de Lila displays affinities with the Famatina basin fauna of western Argentina. The absence of taxa in common between the AMO and the nearby 'Faja Eruptiva de la Puna Occidental' (FEPO) of NW Argentina may result from some kind of environmental barrier or some geographic separation from the Gondwana margin. According to the latter hypothesis, the Quebrada Grande succession developed on the allochtonous Arequipa-Antofalla Terrane. Atacama, en la Región de Antofagasta, aflora una sucesión volcánica y sedimentaria del Paleozoico más temprano (Complejo Ígneo y Sedimentario del Cordón de Lila; CISL) que forma el 'Arco magmático occidental' (AMO), intruida por granitoides del Ordovícico medio-Silúrico inferior. En esta contribución se presenta un análisis sedimentológico y paleontológico de la recientemente reconocida Formación Quebrada Grande, una secuencia marina de ca. 1.600 m de espesor, que cubre, mediante discordancia angular, al CISL, y en la cual es posible definir tres asociaciones de facies que, en orden estratigráfico, son: 1) conglomerados matriz soportados, 2) intercalaciones de areniscas con lutitas y 3) conglomerados clastosoportados. La fracción detrítica deriva principalmente...

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Geodynamic evolution and tectonostratigraphic terranes of northwestern Argentina and northern Chile

Cited by 222 publications

References 77 publications

Ordovician back arc foreland and Ocloyic thrust belt development on the western Gondwana margin as a response to Precordillera terrane accretion

Ordovician back arc foreland and Ocloyic thrust belt development on the western Gondwana margin as a response to Precordillera terrane accretion

America Do Sul: Quatro Fusões, Quatro Fissões E O Processo Acrescionário Andino

La Formacion QuebradaGrande, del Ordovicico, Cordon de Lila (Region de Antofagasta, norte de Chile): significado estratigrafico y paleogeografico.

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