Syn- and post-accretionary cooling history of the Ecuadorian Andes constrained by their in-situ and detrital thermochronometric record

Spikings, Richard; Crowhurst, P. V.; Winkler, Wilfried; Villagómez, Diego

doi:10.1016/j.jsames.2010.04.002

Cited by 77 publications

(115 citation statements)

References 40 publications

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“…Thermochronological studies reveal variable exhumation rates for each Andean domain and several distinct cooling events since the Cretaceous [ Spikings et al ., , ]. These exhumation phases were coeval with transpressive deformations recorded on the continent and are recorded between 75 and 30 Ma, and most importantly for our study during the last 15–10 Ma [ Spikings et al ., ].…”

Section: Introductionsupporting

confidence: 79%

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Partitioning of oblique convergence in the Northern Andes subduction zone: Migration history and the present‐day boundary of the North Andean Sliver in Ecuador

et al. 2016

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Along the Ecuadorian margin, oblique subduction induces deformation of the overriding continental plate. For the last 15 Ma, both exhumation and tectonic history of Ecuador suggest that the northeastward motion of the North Andean Sliver (NAS) was accompanied by an eastward migration of its eastern boundary and successive progressively narrowing restraining bends. Here we present geologic data, earthquake epicenters, focal mechanisms, GPS results, and a revised active fault map consistent with this new kinematic model. All data sets concur to demonstrate that active continental deformation is presently localized along a single major fault system, connecting fault segments from the Gulf of Guayaquil to the eastern Andean Cordillera. Although secondary faults are recognized within the Cordillera, they accommodate a negligible fraction of relative motion compared to the main fault system. The eastern limit is then concentrated rather than distributed as first proposed, marking a sharp boundary between the NAS, the Inca sliver, and the Subandean domain overthrusting the South American craton. The NAS limit follows a northeast striking right‐lateral transpressional strike‐slip system from the Gulf of Guayaquil (Isla Puná) to the Andean Cordillera and with the north‐south striking transpressive faults along the eastern Andes. Eastward migration of the restraining belt since the Pliocene, abandonment of the sutures and reactivation of north‐south striking ancient fault zones lead to the final development of a major tectonic boundary south and east of the NAS, favoring its extrusion as a continental sliver, accommodating the oblique convergence of the Nazca oceanic plate toward South America.

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Section: Introductionsupporting

confidence: 79%

“…[], and Spikings et al . [] The inset cartoon illustrates the large‐scale evolution and eastward migration of the deformation through times. Fore‐arc basin localization after Deniaud [].…”

Section: Introductionmentioning

confidence: 99%

Partitioning of oblique convergence in the Northern Andes subduction zone: Migration history and the present‐day boundary of the North Andean Sliver in Ecuador

et al. 2016

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“…coarse-grained, fsp feldspar, fine-gr. fine-grained, gd granodiorite, hbl hornblende, qtz quartz either between alunite and alunite-hosted mineral or fluid inclusions, across individual alunite crystal structural boundaries, or out of the non-encapsulated irradiation package, the latter potentially causing an age overestimation (Spikings et al 2010). In addition, heterogeneously distributed excess Ar might further contribute to the disturbed age spectrum.…”

Section: Resultsmentioning

confidence: 99%

“…The two provinces are separated by a broad, NNE-trending suture zone concealed below Tertiary volcanic and sedimentary cover sequences of the Inter-Andean Depression; the western limit of the suture zone is likely represented by the major Calacalí-Pujilí-Pallatanga fault zone at the eastern border of the Western Cordillera (Figs. 1 and 2; Vallejo et al 2009;Spikings et al 2010). To the west of the suture zone, an allochthonous, late Cretaceous oceanic plateau sequence, accreted at ca.…”

Section: Regional Geologymentioning

confidence: 99%

Metallogenic features of Miocene porphyry Cu and porphyry-related mineral deposits in Ecuador revealed by Re-Os, 40Ar/39Ar, and U-Pb geochronology

et al. 2011

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Mineralization and alteration events at ten Miocene porphyry Cu and porphyry-related epithermal mineral deposits in southern, central, and northern Ecuador were dated by means of molybdenite Re-Os, biotite and alunite 40 Ar/ 39 Ar, and titanite U-Pb geochronology. Most of these hydrothermal events show a spatio-temporal correlation with porphyry intrusion emplacement as constrained by zircon U-Pb ages. The total age range for these events spans the 23.5-6.1 Ma period, without displaying systematic along-or across-arc age distribution trends. While epithermal deposits tend to be spatially associated with volcanic rocks of a similar age, porphyry Cu deposits in Ecuador are frequently spatially associated with deeper-seated basement units and batholith-scale precursor intrusive systems assembled over ≥5 m.y. time periods. In most cases, formation of the porphyry Cu deposits is related to the -011-0378-z youngest magmatic (-hydrothermal) event in a given area, postdating batholith construction at a regional scale. The majority of Miocene deposits occurs in southern Ecuador where areally extensive, post-mineralization (late Miocene to recent) volcanic sequences with the potential to conceal mineralization at depth are lacking. Only few Miocene deposits occur in northern-central Ecuador, where they mainly crop out in the Western Cordillera, west of the productive present-day volcanic arc. The surface distribution of post-mineralization arc volcanism reflects along-arc variations in subducting slab geometry. Porphyry Cu and epithermal deposits in Ecuador define a Miocene metallogenic belt broadly continuous with its coeval counterpart in northern-central Peru. Although both belt segments were formed in an overall similar tectonomagmatic and metallogenic setting, their respective metal endowments differ significantly.Miner Deposita (2012) 47:383-410 DOI 10.1007/s00126

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“…Exemplary studies have been conducted in the North American Cordillera (Batt et al, 2001;Benowitz et al, 2011;Cecil et al, 2006;Colgan et al, 2008;Farley et al, 2001;Fitzgerald et al, 1995;Hacker et al, 2011;Spotila et al, 2001), the Andes (Barnes et al, 2008;Gunnell et al, 2010;Insel et al, 2010;Schildgen et al, 2007Schildgen et al, , 2009Schildgen et al, , 2010Spikings et al, 2010), the Southern Alps of New Zealand (Batt et al, 2000;Shuster et al, 2011;Kamp, 1993, 1995), and the Himalayan-Tibetan orogenic system (Kirby et al, 2002;Ouimet et al, 2010;Wobus et al, 2008;Zeitler et al, 2001).…”

Section: Reconstructing Regional Patterns Of Deformation and Erosionmentioning

confidence: 99%

Thermochronology in Orogenic Systems

Hodges

2014

Treatise on Geochemistry

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Syn- and post-accretionary cooling history of the Ecuadorian Andes constrained by their in-situ and detrital thermochronometric record

Cited by 77 publications

References 40 publications

Partitioning of oblique convergence in the Northern Andes subduction zone: Migration history and the present‐day boundary of the North Andean Sliver in Ecuador

Partitioning of oblique convergence in the Northern Andes subduction zone: Migration history and the present‐day boundary of the North Andean Sliver in Ecuador

Metallogenic features of Miocene porphyry Cu and porphyry-related mineral deposits in Ecuador revealed by Re-Os, 40Ar/39Ar, and U-Pb geochronology

Thermochronology in Orogenic Systems

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