Paleozoic basin development in northern Chile (21°–27°S)

Bahlburg, Heinrich; Breitkreuz, Christoph; Zeil, Werner

doi:10.1007/bf01821095

Cited by 16 publications

(2 citation statements)

References 11 publications

(3 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, the structural geology and sedimentology of this area were studied by German colleagues (e.g. Breitkreuz and Bahlburg 1985;Bahlburg et al 1987;Bahlburg and Breitkreuz 1993).…”

Section: Geological Settings and Agementioning

confidence: 99%

Lycopsids from the Upper Devonian of northern Chile with remarks on the geographical distribution of the morphogenus Haplostigma Seward

2011

View full text Add to dashboard Cite

We here present the first systematic description of Devonian plant fossils from Chile. The material was collected from the Upper Devonian El Toco Formation in the Coastal Cordillera of northern Chile. Plant fossils occur as impressions of lycopsid axes in marine turbiditic greywacke beds and comprise Haplostigma furquei (Frenguelli) Gutiérrez, Malanzania cf. nana Archangelsky, Azcuy and Wagner, and further unidentifiable remains. The biostratigraphic ranges of these taxa agree well with previous age assessments for this sequence, based on conodonts and radiometric data. Haplostigma was widely distributed in the middle-to-high latitude, cool-temperate biome of southern Gondwana, providing further evidence that Middle to Late Devonian extra-tropical floras of Gondwana were dominated by low-diversity associations of herbaceous lycopsids.

show abstract

Section: Geological Settings and Agementioning

confidence: 99%

Lycopsids from the Upper Devonian of northern Chile with remarks on the geographical distribution of the morphogenus Haplostigma Seward

2011

View full text Add to dashboard Cite

show abstract

“…A crustal discontinuity between the Western and Eastern Puna has been proposed by several authors (Ramos and Coira 2008), evidenced either as interpreted ophiolite remnants (Coira et al 1982;Allmendinger et al 1983;Blasco et al 1996) or as a major strike-slip boundary (Coira et al 1999), being an extensional retroarc setting (Astini 2008) the more accepted alternative nowadays. Although there are outcrops of peridotites, basaltic flows and pillow lavas of the Salar de Pocitos and Calalaste Ranges interpreted inicially as the opening of an oceanic basin (Allmendinger et al 1983;Ramos 1988;Blasco et al 1996), new geochemical results indicate that they were generated in an extensional arcbackarc setting (Balhburg et al 1987;Balhburg and Furlong 1996;Zimmermann et al 1999Zimmermann et al , 2009Balhburg and Zimmerman 1999) emplaced in a thin crust. Another inconsistency is that the sence of movement (taking into account the paleomagnetic results of Forsythe et al 1993) makes the basin wider and deeper to the south while the sedimentation is younger to the north but the paleocurrents are south-north directed (Niemeyer 1989;Balhburg 1990aBalhburg , b, 1991.…”

Section: Previous Proposed Modelsmentioning

confidence: 99%

Reinterpretation of the Ordovician rotations in NW Argentina and Northern Chile: a consequence of the Precordillera collision?

Spagnuolo

Rapalini²,

Astini

2010

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

Early Paleozoic paleomagnetic data from NW Argentina and Northern Chile have shown large systematic rotations within two domains: one composed of the Western Puna that yields very large (up to 80°) counterclockwise rotations, and the other formed by the Famatina Ranges and the Eastern Puna that shows (*40°) clockwise rotations around vertical axes. In several locations, lack of significant rotations in younger rocks constrains this kinematic pattern to have occurred during the Paleozoic. Previous tectonic models have explained these rotations as indicative of rigid-body rotations of large para-autochthonous crustal blocks or terranes. A different but simple tectonic model that accounts for this pattern is presented in which rotations are associated to crustal shortening and tectonic escape due to the collision of the allochthonous terrane of Precordillera in the Late Ordovician. This collision should have generated dextral shear zones in the back arc region of the convergent SW Gondwana margin, where systematic domino-like clockwise rotations of small crustal blocks accommodate crustal shortening. The Western Puna block, bordering the Precordillera terrane to the north, might have rotated counterclockwise as an independent microplate due to tectonic escape processes, in a fashion similar to the present-day relationship between the Anatolia block and the Arabian microplate.

show abstract

The structure of the Precambrian and Lower Paleozoic basement of the Central Andes between 22° and 32°S. Lat.

Mon

Hongn

1991

Geol Rundsch

View full text Add to dashboard Cite

ZusammenfassungIm Andenbasement dieser Region lassen sich drei diastrophische Hauptzyklen, die durch ihren strukturellen Baustil und ihre geographische Verbreitung definiert sind, unterscheiden. Die/iltesten Strukturen sind verkntipft mit den Bewegungen der Panamerikanischen Orogenese (500-700 m. a.), welche im Zentralkraton einen polydeformierten Komplex yon Schiefern, Gneissen und Graniten erzeugte. Diesem lagern diskordant kambrische und ordovizische Sequenzen ohne Metamorphose und prfiandiner Deformation auf. Nach Westen zu gibt es einen Gtirtel stark deformierter ordovizischer Sedimente, die einen einfacheren Baustil als das prfikambrische Basement aufweisen, und diskordant von undeformierten devonischen Abfolgen bedeckt sind. Die Faltung des Ordoviziums wird der Ocloyischen Phase der Kaledonischen Bewegung zugerechnet.Weiter westwfirts tritt ein jtingerer Faltengfirtel aus devonischen Sedimenten auf, die wfihrend der Chanischen Phase der Herzynischen Bewegung intensiv deformiert wurden, und von karbonischen und permischen Sequenzen diskordant tiberlagert sind.Der Ocloyische Gtirtel ist von postordovizischen Graniten die von devonischen Schichten iiberlagert sind, und der Chanische Gtirtel yon karbonischen und permischen Graniten intrudiert. Im pr~kambri-schen Basement des Zentralkratons treten einerseits prfikambrische Granite auf, denen diskordant kambrische Schichten auflagern. Andererseits findet man Granite mit pal/iozoischen Isotopenaltern, letztere aber in Gebieten, wo wegen des Fehlens von Deckschichten eine stratigraphische Kontrolle unm6glich ist.Die gemachten Beobachtungen scheinen darauf hinzudeuten, dab die palfiozoischen Faltengtirtel intrakratonisch sind. Ob es allochtone ,,terrains~ in der pazifischen Ktistenkordillere gibt, ist Gegenstand der Kontroverse. AbstractThree major diastrophic cycles, defined by their structural style and their spatial distribution are recognized in the Andean Basement of this region. The oldest structures are related to the Panamerican Orogeny (500 to 700 m. a.) which produced in the Central Craton multiply deformed complexes of schists, gneisses and granites, that are covered discordantly by unmetamorphosed Cambrian and Ordovician beds. West of the Central Craton Ordovician sedimentary beds are folded with a simple structural style and intruded by granites. Both the sedimentry beds and the granites are covered discordantly by undeformed Devonian sequences. The folding of the Ordovician is attributed to the ocloyic phase of the caledonian movements. West of the ocloyic belt is another foldbelt consisting of strongly folded Devonian beds attributed to the chanic phase (hercynian). The chanic belt is intruded by carboniferous and permian granites and covered discordantly by Carboniferous and Permian sequences.The features observed in the eastern slope of the Andes suggest that the Paleozoic foldbelts are intracratonic. Whether there are accreted terrains in the Pacific Coastal Cordillera is matter of controversy. ResumenEn el basamento de los Andes de esta regi6n s...

show abstract

Paleozoic basin development in northern Chile (21°–27°S)

Cited by 16 publications

References 11 publications

Lycopsids from the Upper Devonian of northern Chile with remarks on the geographical distribution of the morphogenus Haplostigma Seward

Lycopsids from the Upper Devonian of northern Chile with remarks on the geographical distribution of the morphogenus Haplostigma Seward

Reinterpretation of the Ordovician rotations in NW Argentina and Northern Chile: a consequence of the Precordillera collision?

The structure of the Precambrian and Lower Paleozoic basement of the Central Andes between 22° and 32°S. Lat.

Contact Info

Product

Resources

About