globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2019.228302
论文题名:
Structural controls on Jurassic gold mineralization, and Cretaceous-Tertiary exhumation in the foreland of the southern Patagonian Andes: New constraints from La Paloma area, Deseado Massif, Argentina
作者: Fernández M.L.; Mazzoli S.; Zattin M.; Savignano E.; Genge M.C.; Tavani S.; Garrone A.; Franchini M.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 775
语种: 英语
中文关键词: Au-Ag epithermal veins ; Low-temperature thermochronometry ; Multiple Inversion Method ; Ore geology ; Patagonia ; Structural analysis
英文关键词: Binary alloys ; Deposits ; Fission reactions ; Geodynamics ; Gold alloys ; Gold deposits ; Lanthanum ; Ore analysis ; Phosphate minerals ; Silver alloys ; Silver deposits ; Strike-slip faults ; Structural analysis ; Structural dynamics ; Structural geology ; Temperature ; Apatite fission tracks ; Epithermal ; Fluid-rock interaction ; Hydrothermal ore deposit ; Multiple inversion ; Patagonia ; Strike-slip component ; Thermochronometry ; Fault slips ; Cretaceous-Paleogene boundary ; epithermal deposit ; exhumation ; gold ; Jurassic ; mineralization ; silver ; thermochronology ; Andes ; Argentina ; Deseado Massif ; Patagonia ; Santa Cruz [Argentina]
英文摘要: Fluid-rock interaction occurring within high-permeability conduits represented by fault-fracture meshes is well known to control the development of hydrothermal ore deposits. In this study we document the fundamental role of four sets of precursor joints, reactivated as dilational faults displaying variable normal dip-slip and strike-slip components of motion, in the formation of epithermal Au-Ag deposits of economic interest. Paleostress analysis unravels how all the resulting four sets of hybrid extension-shear fractures are kinematically compatible with an extensional stress field characterized by multiple permutations between the σ3 and the σ2 axes. Such permutations are interpreted to be associated with dominantly normal fault reactivation of suitably oriented early joint sets as a result of continued regional extension, and by orthogonal stretching produced by differential downthrow of the hanging-wall blocks of laterally-terminating Jurassic normal faults. Later fault reactivation appears to be associated with far field propagation of Andean stresses, marked by superposed strike-slip and reverse fault slip components recording roughly E-W horizontal compression. This late fault reactivation could be related with a late Early Cretaceous shortening event known to have affected the studied sector of the Deseado Massif. The subsequent tectonic evolution of the study area occurred within the general framework of a slow Cretaceous to Tertiary exhumation recorded by apatite fission track cooling ages. Our new thermochronometric results, recording steady-state cooling at a rate of c. 1 °C/Ma during the last 90 Ma, shed new light onto the post-Jurassic geodynamic evolution of the foreland of the southern Patagonian Andes. © 2019
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170583
Appears in Collections:气候变化与战略

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作者单位: CONICET - Centro Patagónico de Estudios Metalogenéticos, Departamento de Geología y Petróleo, Facultad de Ingeniería, Universidad Nacional del Comahue, Neuquén, Buenos Aires 1400, Argentina; School of Science and Technology, Geology Division, University of Camerino (MC), Via Gentile III Da Varano, Camerino, (MC) 62032, Italy; Dipartimento di Geoscienze, Università degli Studi di Padova, via G. Gradenigo 6, Padova, 35131, Italy; Dipartimento di Scienze della Terra, dell'Ambiente e delle Risorse (DiSTAR), Università degli Studi di Napoli Federico II, Complesso di Monte S. Angelo, Via Cinthia, 21 - Edificio L, Napoli, 80126, Italy; Minera Don Nicolás S.A., Estancia El Condor, Ruta Nacional Nro. 3 km 2080Provincia de Santa Cruz, Argentina

Recommended Citation:
Fernández M.L.,Mazzoli S.,Zattin M.,et al. Structural controls on Jurassic gold mineralization, and Cretaceous-Tertiary exhumation in the foreland of the southern Patagonian Andes: New constraints from La Paloma area, Deseado Massif, Argentina[J]. Tectonophysics,2020-01-01,775
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