Provenance of the Middle Jurassic-Cretaceous sedimentary rocks of the Arequipa Basin (South Peru) and implications for the geodynamic evolution of the Central Andes

Chavez, Cesar; Roddaz, Martín; Dantas, Elton Luiz; Santos, Roberto Ventura; Alván, Aldo

doi:10.1016/j.gr.2021.07.018

Cited by 9 publications

(5 citation statements)

References 89 publications

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“…The inherited zircon grains can be referred to orogenic cycles having built up Amazonia and the subsequent late Neoproterozoic and Palaeozoic proto-Andes as shown by a number of previous provenance studies on Palaeozoic sedimentary and igneous rocks in the Andean realm (Figure 11b,c; Bahlburg et al, 2009Bahlburg et al, , 2011Bahlburg et al, , 2020Cardona et al, 2009;Chew et al, 2007Chew et al, , 2016Einhorn et al, 2015;García Zavaleta et al, 2023;Reimann et al, 2010). A cumulative view shows that most grains fall in the age bracket representing the late Famatinian and early Gondwanan orogenies in the Andean realm between 400 and 300 Ma (Figure 11a,b).…”

Section: F I G U R Ementioning

confidence: 84%

Sedimentology, geochronology and provenance of the late Permian and Triassic Mitu Group in Peru—The evolution of continental facies along a transform margin

Panca,

Bahlburg,

Cárdenas

et al. 2024

Basin Research

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In the late Permian and Triassic, the continental Mitu Group formed in extensional basins along the length of the Cordillera Oriental and Altiplano of present‐day Peru. Given the presence of coeval arc systems only in northern Chile and southern Ecuador but not in Peru the tectonic setting of the Mitu basin has been interpreted variably as orthogonal continental rift, sinistral transtensional rift, aulacogen and back‐arc basin. The Mitu Group comprises continental mass flow and alluvial fan, fluvial, aeolian and minor lacustrian facies and hosts thick piles of subalkaline and alkaline intermediate and felsic ignimbrites and mafic lavas. The age of the Mitu Group had originally been established as ranging from the Late Permian to the late Triassic on the basis of structural considerations and scarce biostratigraphic data. Recently, U–Pb zircon ages from ignimbrites and sedimentary rocks have been taken to constrain the Mitu Group to the Middle and Late Triassic. We performed a sedimentological, heavy mineral, and zircon geochronological and Lu‐Hf isotope study of the Mitu Group in 14 sections mainly in southern and central Peru, and one section in northern Peru. Ten new U–Pb concordia ages on ignimbrites intercalated in the Mitu Group successions offer a new robust stratigraphic framework and constrain the stratigraphy of the Mitu Group between 260 and 205 Ma. In combination with maximum likelihood ages of deposition derived from detrital zircon, U–Pb geochronology places the deposition of the Mitu Group between ca. 270 and 194 Ma (lower Guadalupian into the Sinemurian). Detrital zircon U–Pb age distributions and heavy mineral assemblages reflect a strongly recycled Precambrian Amazonian and Palaeozoic proto‐Andean provenance. The Palaeozoic detrital age patterns are highly variable, and temporally and spatially random. A local provenance can generally not be identified. εHf(t) values in zircon obtained from ignimbrites and sedimentary rocks indicate variable degrees of crustal recycling. In the course of the Palaeozoic, εHf(t) values become on average progressively less negative, with a large proportion particularly of Mitu age zircons' εHf(t) values encompassing less evolved and moderately juvenile compositions. Along strike of the basin stratigraphic thicknesses, and rates and times of accumulation vary strongly with larger thicknesses and rates being registered in southern Peru. This suggests that the Mitu basin had been divided into a number of subbasins with individual histories of subsidence, accumulation, and volcanism. Absent a magmatic arc, late Permian–Triassic Peru evolved in a sinistral plate tectonic and regional framework expressed particularly in the sinistral Late Gondwanide orogeny predating the Mitu Group. We interpret that a sinistral transform fault linked the subduction zones in southern Ecuador and northern Chile and that the Mitu Group basin has formed by sinistral transtensional and transpressional movements along a related transcurrent fault inboard of the transform margin. In the broader framework of the accretionary Terra Australis orogen along the western Gondwana margin, this interpretation fits its evolution in the Andean segment in an internally consistent way.

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Section: F I G U R Ementioning

confidence: 84%

Sedimentology, geochronology and provenance of the late Permian and Triassic Mitu Group in Peru—The evolution of continental facies along a transform margin

Panca,

Bahlburg,

Cárdenas

et al. 2024

Basin Research

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“…(1977); Chavez et al. (2022), see the lithostratigraphic log in Figure 1's legend and Figures 1a–1c and 1d). The base of this series is made up of Triassic to Jurassic andesites and basalts, followed by limestones and massive sandstones, and by Cretaceous volcano‐clastic sequences (Alván et al., 2018; Boekhout et al., 2013; Jenks, 1948).…”

Section: Hydro‐geological Settingmentioning

confidence: 95%

“…The Coastal and Precordillera regions are covered by volcano-sedimentary sequences from the Mesozoic era, overlying Proterozoic to Paleozoic gneiss and granite basement (Cobbing et al (1977); Chavez et al (2022), see the lithostratigraphic log in Figure 1's legend and Figures 1a-1c and 1d). The base of this series is made up of Triassic to Jurassic andesites and basalts, followed by limestones and massive sandstones, and by Cretaceous volcano-clastic sequences (Alván et al, 2018;Boekhout et al, 2013;Jenks, 1948).…”

Section: Lithostratigraphic Settingmentioning

confidence: 99%

Characterization of Southern Peru Hydrothermal Systems: New Perspectives for Geothermal Exploration Along the Andean Forearc

Taillefer,

Truche,

Audin

et al. 2024

Geochem Geophys Geosyst

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This study provides a comprehensive characterization of various hydrothermal systems in Southern Peru ranging from the faulted Precordillera's steep topography up to the volcanic High Cordillera (>4,000 m asl). The objective is to investigate thermal anomalies that may potentially serve as new geothermal resources. Our integrated approach combines: (a) geochemistry from 14 hot springs sampled throughout the Tacna region, and (b) 3D numerical modeling of coupled groundwater and heat transfer considering topography and faults embedded in homogeneous permeability. Water and gas analysis indicates that the springs located near volcanoes discharge Na‐K‐Cl waters with high temperatures (>87°C), high Total Dissolved Solid concentrations (TDS >3,452 mg/L), and free gases dominated by CO2 (>90 vol%). Springs located along the regional faults in the Precordillera discharge Ca‐SO4 and Na‐K‐Cl waters with moderate temperatures (27–53°C), intermediate TDS concentrations (464–2,458 mg/L), radiocarbon ages between 1.4 and 7.9 kyr, and free gases dominated by N2 (>95 vol%). The Aruma springs, which are located at the transition between the High and the Precordillera, display intermediate characteristics. Numerical models accurately replicate the locations and temperatures of the fault‐related springs only for permeable faults (>10−14 m2), revealing the creation of 100‐km long thermal plumes along faults, locally rising up the 150°C‐isotherm to about ∼1,000 m below the surface. This approach clearly distinguishes the spring origins, which are volcanic in High Cordillera and tectonic in Precordillera. Moreover, we highlight that steep topographic gradient and permeable reverse faults in the Andean forearc may generate considerable thermal anomalies, opening perspectives for the geothermal exploration.

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Section: Lithostratigraphic Settingmentioning

confidence: 99%

Characterization of Southern Peru hydrothermal systems: New perspectives for geothermal exploration along the Andean forearc

Taillefer,

Truche

et al. 2024

Preprint

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This study provides a comprehensive characterization of various hydrothermal sys- tems in Southern Peru ranging from the faulted Precordillera’s steep topography up to the volcanic High Cordillera (>4000 m asl). The objective is to investigate thermal anoma- lies that may potentially serve as new geothermal resources.Our integrated approach com- bines: i) geochemistry from 14 hot springs sampled throughout the Tacna region, and ii) 3D numerical modeling of coupled groundwater and heat transfer considering topog- raphy and faults embedded in homogeneous permeability. Water and gas analysis indi- cates that the springs located near volcanoes discharge Na-K-Cl waters with high tem- peratures (>87°C), high Total Dissolved Solid concentrations (TDS >3452 mg/L), and free gases dominated by CO2 (>90 vol%). Springs located along the regional faults in the Precordillera discharge Ca-SO4 and Na-K-Cl waters with moderate temperatures (27- 53°C), intermediate TDS concentrations (464-2458 mg/L), radiocarbon ages between 1.4 and 7.9 kyr, and free gases dominated by N2 (>95 vol%). The Aruma springs, which are located at the transition between the High and the Precordillera, display intermediate characteristics. Numerical models accurately replicate the locations and temperatures of the fault-related springs only for permeable faults (>10 m), revealing the creation of 100-km long thermal plumes along faults, locally rising up the 150°C-isotherm to about ∼ 1000 m below the surface. This approach clearly distinguishes the spring origins, which are volcanic in High Cordillera and tectonic in Precordillera. Moreover, we highlight that steep topographic gradient and permeable reverse faults in the Andean forearc may gen- erate considerable thermal anomalies, opening perspectives for the geothermal exploration.

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Provenance of the Middle Jurassic-Cretaceous sedimentary rocks of the Arequipa Basin (South Peru) and implications for the geodynamic evolution of the Central Andes

Cited by 9 publications

References 89 publications

Sedimentology, geochronology and provenance of the late Permian and Triassic Mitu Group in Peru—The evolution of continental facies along a transform margin

Sedimentology, geochronology and provenance of the late Permian and Triassic Mitu Group in Peru—The evolution of continental facies along a transform margin

Characterization of Southern Peru Hydrothermal Systems: New Perspectives for Geothermal Exploration Along the Andean Forearc

Characterization of Southern Peru hydrothermal systems: New perspectives for geothermal exploration along the Andean forearc

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