Paleomagnetic evidence for a very large counterclockwise rotation of the Madre de Dios Archipelago, southern Chile

Rapalini, Augusto E.; Hervé, Francisco; Ramos, Víctor A.; Singer, Silvia

doi:10.1016/s0012-821x(00)00339-3

Cited by 28 publications

(18 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some parts of this complex may be as old as Devonian (Faundez, Herve & Lacassie, 2002) but other parts have detrital zircon peaks of Carboniferous and Permian ages (Hervé, Fanning & Pankhurst, 2003) and probably overlap with Trinity Peninsula Group and Duque de York Complex deposition. Interestingly, both the Trinity Peninsula Group and the Eastern Andes Metamorphic Complex lack the accreted Carboniferous-Permian limestone and Permian red chert that is common in the Duque de York (subduction) Complex (Rapalini et al 2001) and it is possible that the Eastern Andes Metamorphic Complex and the Trinity Peninsula Group share a common supra-subduction tectonic setting in Permian and Triassic times. There is little evidence of an active volcanic arc in the provenance of either unit other than the Permian zircons that due to their small size, typically less than 200 microns, could be far travelled.…”

Section: Discussionmentioning

confidence: 99%

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

et al. 2011

View full text Add to dashboard Cite

-Field observations from the Trinity Peninsula Group at View Point on the Antarctic Peninsula indicate that thick, southward-younging and overturned clastic sedimentary rocks, comprising unusually coarse conglomeratic lenses within a succession of fine-grained sandstonemudstone couplets, are the deposits of debris and turbidity flows on or at the foot of a submarine slope. Three detrital zircons from the sandstone-mudstone couplets date deposition at 302 ± 3 Ma, at or shortly after the Carboniferous-Permian boundary. Conglomerates predominantly consist of quartzite and granite and contain boulders exceeding 500 mm in diameter. Zircons from granitoid clasts and a silicic volcanic clast yield U-Pb ages of 466 ± 3 Ma, 373 ± 5 Ma and 487 ± 4 Ma, respectively and have corresponding average εHf t values between +0.3 and +7.6. A quartzite clast, conglomerate matrix and sandstone interbedded with the conglomerate units have broadly similar detrital zircon age distributions and Hf isotope compositions. The clast and detrital zircon ages match well with sources within Patagonia; however, the age of one granite clast and the εHf characteristics of some detrital zircons point to a lesser South Africa or Ellsworth Mountain-like contribution, and the quartzite and granite-dominated composition of the conglomerates is similar to upper Palaeozoic diamictites in the Ellsworth Mountains. Unlike detrital zircons, large conglomerate clasts limit possible transport distance, and suggest sedimentation took place on or near the edge of continental crust. Comparison with other upper Palaeozoic to Mesozoic sediments in the Antarctic Peninsula and Patagonia, including detrital zircon composition and the style of deformation, suggests deposition of the Trinity Peninsula Group in an upper plate basin on an active margin, rather than a subduction-related accretionary setting, with slow extension and rifting punctuated by short periods of compression.

show abstract

Section: Discussionmentioning

confidence: 99%

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

et al. 2011

View full text Add to dashboard Cite

show abstract

“…47-27 Ma period coincided with slow convergence rates and extremely oblique convergence (Pardo-Casas and Molnar, 1987;Somoza and Ghidella, 2005). The Paleogene oblique subduction against the Patagonian Andes has been connected with lower denudation rates revealed by fissiontrack data from the basement domain (Thomson et al, 2001) and the large counterclockwise rotation of the Late Paleozoic Madre de Dios Terrane in Eocene times (Rapalini et al, 2001;Fig. 3).…”

Section: Geological Structure and Tectonic Frameworkmentioning

confidence: 99%

Structural, tectonic and glaciological controls on the evolution of fjord landscapes

Glasser

Ghiglione

2009

Geomorphology

View full text Add to dashboard Cite

“…Oceanic subduction below western Patagonia has been active since at least the beginning of Middle Jurassic (Ramos, 1981(Ramos, , 2002 and perhaps earlier (Rapalini et al, 2001;Hervé et al, 2007). Following Permian accretion, Patagonia recorded an episode of continental extension that started in the upper Triassic and continued during the Lower and Middle Jurassic (Ramos, 2002).…”

Section: Geodynamics and Geologymentioning

confidence: 99%

Uplift of quaternary shorelines in eastern Patagonia: Darwin revisited

et al. 2011

View full text Add to dashboard Cite

During his journey on the Beagle, Darwin observed the uniformity in the elevation of coastal Eastern Patagonia along more than 2000 km. More than one century later, the sequences of Quaternary shorelines of eastern Patagonia have been described and their deposits dated but not yet interpreted in terms of geodynamics. Consequently, we i) mapped the repartition of the Quaternary coastal sequences in Argentinean Patagonia, ii) secured accurate altitudes of shoreline angles associated with erosional morphologies (i.e. marine terraces and notches), iii) took into account previous chrono-stratigraphical interpretations in order to calculate mean uplift rates since~440 ka (MIS 11) and proposed age ranges for the higher and older features (up to~180 m), and iv) focused on the Last Interglacial Maximum terrace (MIS 5e) as the best constrained marine terrace (in terms of age and altitude) in order to use it as a tectonic benchmark to quantify uplift rates along the entire passive margin of Eastern South America. Our results show that the eastern Patagonia uplift is constant through time and twice the uplift of the rest of the South American margin. We suggest that the enhanced uplift along the eastern Patagonian coast that interested Darwin during his journey around South America on the Beagle could originate from the subduction of the Chile ridge and the associated dynamic uplift.

show abstract

Paleomagnetic evidence for a very large counterclockwise rotation of the Madre de Dios Archipelago, southern Chile

Cited by 28 publications

References 28 publications

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

Structural, tectonic and glaciological controls on the evolution of fjord landscapes

Uplift of quaternary shorelines in eastern Patagonia: Darwin revisited

Contact Info

Product

Resources

About