The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block
TIMS and SHRIMP U-Pb zircon geochronology of selected parts of the Puncoviscana Formation suggest its deposition took place mainly during the Early Cambrian, coeval with 540-535. Ma calc-alkaline Pampean arc volcanism mainly preserved as tuff beds in the oldest identified parts of this unit. Syn- to...
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| LEADER | 28067caa a22015857a 4500 | ||
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| 001 | PAPER-10125 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518204008.0 | ||
| 008 | 190411s2011 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-83555166107 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Escayola, M.P. | |
| 245 | 1 | 4 | |a The age and tectonic setting of the Puncoviscana Formation in northwestern Argentina: An accretionary complex related to Early Cambrian closure of the Puncoviscana Ocean and accretion of the Arequipa-Antofalla block |
| 260 | |c 2011 | ||
| 270 | 1 | 0 | |m Escayola, M.P.; CONICET- IDEAN, Instituto de Estudios Andinos, Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Pabellón II, Nuñez, Buenos Aires, C1428EHA, Argentina; email: mescayola@gl.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a Wood, D.A., Tarney, J., Saunders, A.D., Bougault, H., Joron, J.L., Treuilet, M., Cann, J.R., Geochemistry of basalts drilled in the north Atlantic by IPOD Leg. 49: implications for mantle heterogeneity (1979) Earth and Planetary Science Letters, 42, pp. 77-79 | ||
| 504 | |a Zimmermann, U., Provenance studies of very low-to low-grade metasedimentary rocks of the Puncoviscana Complex, northwest Argentina (2005) Geological Society of London. Special Publication 246, pp. 381-416. , A. Vaughan, P. Leat, R. Pankhurst (Eds.) | ||
| 520 | 3 | |a TIMS and SHRIMP U-Pb zircon geochronology of selected parts of the Puncoviscana Formation suggest its deposition took place mainly during the Early Cambrian, coeval with 540-535. Ma calc-alkaline Pampean arc volcanism mainly preserved as tuff beds in the oldest identified parts of this unit. Syn- to post-tectonic plutons constrains the Tilcarian-Pampean orogeny to have occurred between ca. 530. Ma and deposition of the unconformably overlying Middle-Upper Cambrian Meson Group. Deposition of the Puncoviscana Formation continued after the onset of the Tilcarian-Pampean orogeny. We propose that the Puncoviscana Formation rocks older than 530. Ma were deposited in the arc-trench gap of the west-facing Pampean arc and/or the associated trench, whereas the rocks younger than 530. Ma were deposited in a syn-collision foreland basin. The Puncoviscana Formation rocks were progressively assembled into a west-younging accretionary complex, consistent with the style of deformation and low-grade metamorphism. The age of the syn-collision plutons (≤530. Ma) suggest the foredeep deposits record the transition from trench to foreland basin, due to arrival of the Arequipa-Antofalla block at the west-facing trench at ca. 530. Ma. Our geochronological and Pb-isotope investigations suggest that the Arequipa-Antofalla terrane was a coherent, ribbon-shaped crustal block that also included the western part of the Pampia terrane. A compilation of existing U-Pb zircon studies suggests that the Pampean arc extended along the length of the proto-Andean margin of West Gondwana, represented by the previously amalgamated Amazonia and Rio de La Plata cratons, and probably was initiated during the late Ediacaran after 600. Ma.Following earlier workers, we reaffirm that the Arequipa-Antofalla block was originally separating Laurentia and Amazonia in Rodinia. It probably rifted from Laurentia during the Ediacaran between 600 and 570. Ma, following an earlier departure of Amazonia (∼650. Ma?). The separation of Arequipa-Antofalla from Amazonia and Laurentia opened the Puncoviscana and Iapetus oceans respectively. © 2011 Elsevier Ltd. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: We are grateful to Ricardo Omarini of Salta University for discussions and companionship in the field during several fieldtrips. CONICET-IDEAN (Instituto de Estudios Andinos, Universidad de Buenos Aires) and the Geological Survey of Canada under TGI 3, financially and logistically supported this project. The unfailing financial support from Neil Rogers in his role as leader of Appalachian TGI 3 at the GSC in Ottawa was instrumental in carrying out this project. His recognition of the significance of this research for van Staal’s ongoing studies related to opening of Iapetus and the Appalachian orogen, showed considerable intellectual depth. This paper benefited from the editing by Alex Zagorevski the comments of three anonymous reviewers and Dr. Victor Ramos, regional editor of JSAES. We also appreciate the help of Mario Campaña from Red Pangea for making some of the figures in great haste. This is Geological Survey of Canada publication 20110098. | ||
| 593 | |a CONICET- IDEAN, Instituto de Estudios Andinos, Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Pabellón II, Nuñez, Buenos Aires, C1428EHA, Argentina | ||
| 593 | |a Geological Survey of Canada, 625 Robson Street, Vancouver, V6B 5J3 BC, Canada | ||
| 593 | |a Geological Survey of Canada, 601 Booth St, Ottawa K1S 4H7, ON, Canada | ||
| 690 | 1 | 0 | |a AREQUIPA ANTOFALLA |
| 690 | 1 | 0 | |a PUNCOVISCANA OCEAN |
| 690 | 1 | 0 | |a TILCARIAN-PAMPEAN OROGENY |
| 690 | 1 | 0 | |a ACCRETIONARY PRISM |
| 690 | 1 | 0 | |a CAMBRIAN |
| 690 | 1 | 0 | |a DEPOSITION |
| 690 | 1 | 0 | |a EDIACARAN |
| 690 | 1 | 0 | |a FORELAND BASIN |
| 690 | 1 | 0 | |a GEOCHRONOLOGY |
| 690 | 1 | 0 | |a GONDWANA |
| 690 | 1 | 0 | |a LAURENTIA |
| 690 | 1 | 0 | |a LEAD ISOTOPE |
| 690 | 1 | 0 | |a LOW GRADE METAMORPHISM |
| 690 | 1 | 0 | |a TECTONIC SETTING |
| 690 | 1 | 0 | |a UNCONFORMITY |
| 650 | 1 | 7 | |2 spines |a PLUTON |
| 651 | 4 | |a ARGENTINA | |
| 700 | 1 | |a van Staal, C.R. | |
| 700 | 1 | |a Davis, W.J. | |
| 773 | 0 | |d 2011 |g v. 32 |h pp. 438-459 |k n. 4 |p J. South Am. Earth Sci. |x 08959811 |w (AR-BaUEN)CENRE-1080 |t Journal of South American Earth Sciences | |
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| 856 | 4 | 0 | |u https://doi.org/10.1016/j.jsames.2011.04.013 |y DOI |
| 856 | 4 | 0 | |u https://hdl.handle.net/20.500.12110/paper_08959811_v32_n4_p438_Escayola |y Handle |
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| 961 | |a paper_08959811_v32_n4_p438_Escayola |b paper |c PE | ||
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| 999 | |c 71078 | ||