Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting
Geochemical characteristics of Ordovician basic volcanic rocks help to define the evolving tectonic setting of the Argentine Puna and northern Chile. Four spatially distinct magmatic groups are defined on geological, petrographical, geochemical and isotopic bases, each associated with particular geo...
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2009
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| LEADER | 24701caa a22014417a 4500 | ||
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| 001 | PAPER-8959 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203849.0 | ||
| 008 | 190411s2009 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-59149089893 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Coira, B. | |
| 245 | 1 | 0 | |a Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting |
| 260 | |c 2009 | ||
| 270 | 1 | 0 | |m Coira, B.; Instituto de Geología y Minería, UNJu-CONICET, C.C. 258, 4600 S.S. de Jujuy, Argentina; email: bcoira@idgym.unju.edu.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a Geochemical characteristics of Ordovician basic volcanic rocks help to define the evolving tectonic setting of the Argentine Puna and northern Chile. Four spatially distinct magmatic groups are defined on geological, petrographical, geochemical and isotopic bases, each associated with particular geodynamic environments. The Tremadoc western group of subalkaline low K tholeiites with arc and modified MORB like signatures represent early stages of a back-arc basin, where spreading was incipient. The Arenig western group, medium K calc-alkaline basalts to andesites have volcanic arc in transition to back-arc signatures. The Tremadoc subalkaline basalts of the eastern group have REE patterns similar to E-MORB and at the same time weak subduction characteristics suggesting a rather mature supra-subduction zone (SSZ) basin. In contrast, the Late Tremadocian-Arenig basalts of the same group have intra-plate signatures, interpreted as magmas that ascended along pull apart regions associated with a transtensional regime. The geochemical patterns were applied to correlate basic sequences of doubtful geological setting. So, basalts from Chile were related to the Tremadocian western group, where they represent a slightly more mature stage of spreading of the basin. Basic rocks from Pocitos and part of Calalaste represent pre-Ordovician records of a back-arc system similar to that of the Tremadoc western group. Clearly similar arc patterns to those of the Arenig western group allow extending the arc environment to the southern Puna. The Tremadocian basalts from the eastern group were related to metabasites from the southern Puna, as part of a back-arc environment at that time. |l eng | |
| 536 | |a Detalles de la financiación: Secretaría de Ciencia y Técnica, Universidad de Buenos Aires, X207 | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica, PICT 7-8724 | ||
| 536 | |a Detalles de la financiación: The manuscript was greatly improved after revision by Robert Kay; we are grateful for his collaboration. Constructive reviews from V. Ramos and one anonymous referee substantially contributed to better the quality of this work. We want to thank P. Flores and P. Cachizumba for carrying out FRX analyses of major and trace elements and S. Rosas for their valuable participation in the design works. Financial support for field and laboratory works was provided by ANPCyT (Grant PICT 7-8724 to B Coira) and UBACYT (Grant X207 to Koukharsky). Appendix Analytical methods See . Table 1 | ||
| 593 | |a Instituto de Geología y Minería, UNJu-CONICET, C.C. 258, 4600 S.S. de Jujuy, Argentina | ||
| 593 | |a Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, UBA-CONICET, C.Universitaria, Pabellon 2, Piso 1, 1428 Buenos Aires, Argentina | ||
| 593 | |a Centro Atómico Bariloche, 8400 Bariloche, Río Negro, Argentina | ||
| 593 | |a Facultad de Ciencias Naturales, UNT-CONICET, Miguel Lillo 205, 4000 San Miguel de Tucumán, Argentina | ||
| 651 | 4 | |a ARGENTINA | |
| 651 | 4 | |a ARGENTINA | |
| 651 | 4 | |a CHILE | |
| 651 | 4 | |a SAN JUAN [ARGENTINA] | |
| 651 | 4 | |a SOUTH AMERICA | |
| 690 | 1 | 0 | |a BASIC MAGMATISM |
| 690 | 1 | 0 | |a NORTHERN CHILE |
| 690 | 1 | 0 | |a ORDOVICIAN |
| 690 | 1 | 0 | |a PUNA |
| 690 | 1 | 0 | |a BACKARC BASIN |
| 690 | 1 | 0 | |a ISLAND ARC |
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| 690 | 1 | 0 | |a PETROGRAPHY |
| 690 | 1 | 0 | |a SUBDUCTION ZONE |
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| 700 | 1 | |a Koukharsky, M. | |
| 700 | 1 | |a Guevara, S.R. | |
| 700 | 1 | |a Cisterna, C.E. | |
| 773 | 0 | |d 2009 |g v. 27 |h pp. 24-35 |k n. 1 |p J. South Am. Earth Sci. |x 08959811 |w (AR-BaUEN)CENRE-1080 |t Journal of South American Earth Sciences | |
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