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Estratos del Cordon de los Ratones

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Stratigraphic sections of the Estratos del Cordón de los Ratones unit at the localities of (a) Cerro Negro hill, (b, c) Cordón de los Ratones hill chain and (d) the foothills of the Cerros del Principal range.

Stratigraphic sections of the Estratos del Cordón de los Ratones unit at th... Available to Purchase

Published: 09 December 2019
Fig. 4. Stratigraphic sections of the Estratos del Cordón de los Ratones unit at the localities of ( a ) Cerro Negro hill, ( b , c ) Cordón de los Ratones hill chain and ( d ) the foothills of the Cerros del Principal range.
Journal Article

Eocene arc petrogenesis in Central Chile ( c. 33.6° S) and implications for the Late Cretaceous–Miocene Andean setting: tracking the evolving tectonic regime Available to Purchase

Marcia Muñoz-Gómez, Constanza Fuentes, Francisco Fuentes, Felipe Tapia, Mathieu Benoit, Marcelo Farías, C. Mark Fanning, Andrés Fock, Reynaldo Charrier, Daniel Sellés, Daniela Bustamante
Published: 09 December 2019
Journal of the Geological Society (2020) 177 (2): 258–275.
DOI: https://doi.org/10.1144/jgs2019-042
...Fig. 4. Stratigraphic sections of the Estratos del Cordón de los Ratones unit at the localities of ( a ) Cerro Negro hill, ( b , c ) Cordón de los Ratones hill chain and ( d ) the foothills of the Cerros del Principal range. ...
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View PDF for article title, Eocene arc petrogenesis in Central Chile ( c. 33.6° S) and implications for the Late Cretaceous–Miocene Andean setting: tracking the evolving tectonic regime
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General compositional features of igneous rocks from the Estratos del Cordón de los Ratones unit (Sellés 2000; this work). (a) total alkalis–silica diagram and (b) AFM diagram, with magmatic series subdivisions after Irvine & Baragar (1971).

General compositional features of igneous rocks from the Estratos del Cordó... Available to Purchase

Published: 09 December 2019
Fig. 8. General compositional features of igneous rocks from the Estratos del Cordón de los Ratones unit ( Sellés 2000 ; this work). ( a ) total alkalis–silica diagram and ( b ) AFM diagram, with magmatic series subdivisions after Irvine & Baragar (1971) .
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Schematic summary of the stratigraphy of the study area and its surroundings (c. 33° 30′–34° 00′ S; see Fig. 1) and the associated coeval tectonic regimes recognized. Compiled from Charrier et al. (2002), Boyce et al. (2014), Boyce (2015) and this work. ECLR, Estratos del Cordón de los Ratones unit.

Schematic summary of the stratigraphy of the study area and its surrounding... Available to Purchase

Published: 09 December 2019
Cordón de los Ratones unit.
Image
Example of outcrop-scale characteristics of the Estratos del Cordón de los Ratones unit in the study area. (a) Dacitic lava with flow banding and angular lithic fragments; (b) folding and rheomorphic textures in a rhyolitic lava flow; (c) lapilli vitric tuff with fiammes; (d) columnar jointing in intrusive dome; (e) banded rhyolitic lava flow showing abrupt changes in flow direction; and (f) development of dropstone texture over a finely laminated tuff.

Example of outcrop-scale characteristics of the Estratos del Cordón de los ... Available to Purchase

Published: 09 December 2019
Fig. 5. Example of outcrop-scale characteristics of the Estratos del Cordón de los Ratones unit in the study area. ( a ) Dacitic lava with flow banding and angular lithic fragments; ( b ) folding and rheomorphic textures in a rhyolitic lava flow; ( c ) lapilli vitric tuff with fiammes; ( d
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(a) Multi-element diagrams and selected rare earth element ratios for igneous rocks from the Estratos del Cordón de los Ratones unit (Sellés 2000; this work). (a) Rare earth element concentrations normalized to chondrite (Sun & McDonough 1989) and the spider multi-element plot normalized to normal mid-ocean ridge basalt (N-MORB) (Pearce 1983). (b) Fields defined by the current Andean Southern Volcanic Zone magmas are included as reference (abbreviations as in Fig. 9).

( a ) Multi-element diagrams and selected rare earth element ratios for ign... Available to Purchase

Published: 09 December 2019
Fig. 10. ( a ) Multi-element diagrams and selected rare earth element ratios for igneous rocks from the Estratos del Cordón de los Ratones unit ( Sellés 2000 ; this work). ( a ) Rare earth element concentrations normalized to chondrite ( Sun & McDonough 1989 ) and the spider multi-element
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Sr–Nd isotopic composition of igneous rocks from the Estratos del Cordón de los Ratones unit. The field defined by the mantle array (Wilson 1989) is shown as reference and the fields for different igneous units from the Chilean margin are shown for comparison. The latter correspond to (1) the Abanico and Farellones formations from Nyström et al. (2003), (2) ɛNd(i) data from Fuentes (2004) and (3) the Andean Southern Volcanic Zone (abbreviations as in Fig. 9).

Sr–Nd isotopic composition of igneous rocks from the Estratos del Cordón de... Available to Purchase

Published: 09 December 2019
Fig. 11. Sr–Nd isotopic composition of igneous rocks from the Estratos del Cordón de los Ratones unit. The field defined by the mantle array ( Wilson 1989 ) is shown as reference and the fields for different igneous units from the Chilean margin are shown for comparison. The latter correspond
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Photomicrographs showing the main petrographic characteristics of igneous rock samples from the Estratos del Cordón de los Ratones unit. (a, b) Basaltic andesitic lava flows; (c) intrusive rocks; (d, e) acid lava flows; and (f) intrusive rocks; see text for further details. Chl, chlorite; FB, flow banding; FT, felsitic texture; Ol, olivine; Pl, plagioclase; PPL, plane polarized light; PT, perlitic texture; Px, pyroxene; Qz, quartz; Sap, saponite; XPL, cross-polarized light; Zeo, zeolite.

Photomicrographs showing the main petrographic characteristics of igneous r... Available to Purchase

Published: 09 December 2019
Fig. 7. Photomicrographs showing the main petrographic characteristics of igneous rock samples from the Estratos del Cordón de los Ratones unit. ( a , b ) Basaltic andesitic lava flows; ( c ) intrusive rocks; ( d , e ) acid lava flows; and ( f ) intrusive rocks; see text for further details
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Selected major and trace element Harker diagrams for igneous rocks from the Estratos del Cordón de los Ratones unit (Sellés 2000; this work). Fields defined by the current Andean Southern Volcanic Zone magmas (SVZ) are included as reference. The latter have been grouped in the northern (NSVZ), transitional (TSVZ) and southern (SSVZ) segments, as indicated in Figure 1. The data were taken from Hickey et al. (1986), Futa & Stern (1988), Hildreth & Moorbath (1988), Stern (1988), Sruoga et al. (2005), Holm et al. (2014) and Hickey-Vargas et al. (2016a, b).

Selected major and trace element Harker diagrams for igneous rocks from the... Available to Purchase

Published: 09 December 2019
Fig. 9. Selected major and trace element Harker diagrams for igneous rocks from the Estratos del Cordón de los Ratones unit ( Sellés 2000 ; this work). Fields defined by the current Andean Southern Volcanic Zone magmas (SVZ) are included as reference. The latter have been grouped in the northern
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U–Pb age determinations in primary igneous zircons of samples from the Estratos del Cordón de los Ratones units. Tera-Wasserburg plots and corresponding frequency histograms (light blue boxes) and relative probability density plots are shown. Error ellipses are indicated at the 2σ level and weighted-average ages are indicated as insets. Only data with a discordance <25% have been plotted in the diagrams corresponding to laser ablation inductively coupled plasma mass spectrometry analyses (CR018, CR046, CR052). For sample CR052, inherited ages (two spots) were not considered in the diagrams. For sample ANG01, the final age considered incorporates the external error and corresponds to 42.96 ± 0.31 (Table 1).

U–Pb age determinations in primary igneous zircons of samples from the Estr... Available to Purchase

Published: 09 December 2019
Fig. 6. U–Pb age determinations in primary igneous zircons of samples from the Estratos del Cordón de los Ratones units. Tera-Wasserburg plots and corresponding frequency histograms (light blue boxes) and relative probability density plots are shown. Error ellipses are indicated at the 2 σ level