Erratum to: Variscan tectonics in the Iberian Pyrite Belt, South Portuguese Zone

Soriano, Carles; Casas, Josep Maria

doi:10.1007/s00531-002-0269-8

Cited by 21 publications

(17 citation statements)

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“…The major structural feature of the IPB consists of a south-verging thrust-fold belt complex that caused significant crustal thickening and stacking. This structural configuration, compatible with a thin-skinned geometry, was developed in the course of two main deformation phases, presumably on top of a major cryptic décollement correlated with the lower-upper Devonian transition within the Phyllite-Quartzite Formation [29,31,[58][59][60][61][62]. Data gathered so far support the conclusion that the structural evolution experienced by the IPB is controlled by the OMZ-SPZ oblique collision.…”

Section: Geodynamic Framework Of the Sw Iberian Variscides: Setting Osupporting

confidence: 65%

The Beja Layered Gabbroic Sequence (Ossa-Morena Zone, Southern Portugal): geochronology and geodynamic implications

et al. 2007

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The Beja Igneous Complex (BIC) is a major geological feature in SW Iberian Variscides, consisting of three main units developed during different stages of the oblique collision between the Ossa Morena Zone (OMZ) upper plate and South Portuguese Zone (SPZ) lower plate, namely: (1) ca. 355 Ma to ca. 345 Ma Layered Gabbroic Sequence formed in early stages of collision magmatism; (2) the ca. 335-330 Ma to ca. 320 Ma Cuba-Alvito (gabbro-diorite) Complex formed throughout the late-collision magmatic event; and (3) the Baleizão Porphyry Complex corresponding to the period of post-collision magmatism, ca. 300 Ma. The new SHRIMP U-Pb age of 342±9 Ma reported here for amphibole-bearing pegmatite dykes cutting the layered gabbros is interpreted as dating the development of late fluid-rich melts in the Layered Gabbroic Sequence, synchronous with Fe-Cu-Co sulphide deposition. The close agreement between this data and available amphibole 40 Ar/ 39 Ar ages of BIC, Beja-Acebuches Ophiolite and other geological units of the OMZ southern border, may be taken as evidence for a moderate to rapid regional crustal uplift episode at ca. 340±5 Ma; this data, coupled with structural constraints, also allow to estimate the age for the transition between the D 2a -D 2b deformation phases of Variscan continental collision. A complex wedge system within the SW Iberian Variscides developed during this collision, involving the OMZ upper plate to the north and the SPZ passive margin in the lower plate. The Évora-Beja-Aracena Domain, located in the upper plate above the N-dipping subduction zone, is re-interpreted as a retro-wedge domain that was kinematically coupled to the SPZ pro-wedge and subduction system. Retro-wedge growth is linked to upper plate uplift (early collision) and a late-orogenic wedge thickening. The early stages of magmatism in the retro-wedge are related to asthenospheric mantle upwelling induced by the slab break-off. Regional LP-HT metamorphism and subsequent magmatic events in the retro-wedge domain were caused by long term high heat flow sustained by (1) mafic magma underplating, (2) stacking of high-heat producing upper-crustal lithologies, and reinforced (3) by (moderate to) rapid crustal uplifting. Mass advection and orogenic architecture were strongly affected by asymmetric removal towards the lower-part foreland basin and by transient mechanical properties of the wedge system associated with the anomalous thermal regime.

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Section: Geodynamic Framework Of the Sw Iberian Variscides: Setting Osupporting

confidence: 65%

The Beja Layered Gabbroic Sequence (Ossa-Morena Zone, Southern Portugal): geochronology and geodynamic implications

et al. 2007

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“…Within the test site, different iron-bearing facies occur, such as the gossan itself, massive sulphide, altered shale and river sediments under the influence of acidic mine drainage (AMD) (Riaza et al [25]). The Iberian pyrite belt is hosted in a north -vergent fold and thrust belt of late Variscan age (Soriano and Casas [26], Donaire et al [27]) extending from east of Setubal/Portugal to north of Seville/Spain. A typical succession starts with a series of phyllites/quartzites, followed by slates, basalt sills, felsic volcanics (rhyolites and dacites) and Culm series (greywackes and slates) (Donaire et al [27]).…”

Section: Test Sitementioning

confidence: 99%

“…A typical succession starts with a series of phyllites/quartzites, followed by slates, basalt sills, felsic volcanics (rhyolites and dacites) and Culm series (greywackes and slates) (Donaire et al [27]). The stratabound, volcanogenic massive sulphide (VMS) lenses are hosted in felsic volcanics of Upper Devonian to Lower Carboniferous ages (Soriano and Casas [26]). Zones of chloritic and argillitic alteration (Saez and Donaire [28]) are associated with those lenses.…”

Section: Test Sitementioning

confidence: 99%

The Need for Accurate Geometric and Radiometric Corrections of Drone-Borne Hyperspectral Data for Mineral Exploration: MEPHySTo—A Toolbox for Pre-Processing Drone-Borne Hyperspectral Data

2017

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Drone-borne hyperspectral imaging is a new and promising technique for fast and precise acquisition, as well as delivery of high-resolution hyperspectral data to a large variety of end-users. Drones can overcome the scale gap between field and air-borne remote sensing, thus providing high-resolution and multi-temporal data. They are easy to use, flexible and deliver data within cm-scale resolution. So far, however, drone-borne imagery has prominently and successfully been almost solely used in precision agriculture and photogrammetry. Drone technology currently mainly relies on structure-from-motion photogrammetry, aerial photography and agricultural monitoring. Recently, a few hyperspectral sensors became available for drones, but complex geometric and radiometric effects complicate their use for geology-related studies. Using two examples, we first show that precise corrections are required for any geological mapping. We then present a processing toolbox for frame-based hyperspectral imaging systems adapted for the complex correction of drone-borne hyperspectral imagery. The toolbox performs sensor-and platform-specific geometric distortion corrections. Furthermore, a topographic correction step is implemented to correct for rough terrain surfaces. We recommend the c-factor-algorithm for geological applications. To our knowledge, we demonstrate for the first time the applicability of the corrected dataset for lithological mapping and mineral exploration.

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“…The transpressional nature of the Variscan deformation on a regional scale has been mentioned by several authors (i.e. Quesada, 1998;Soriano and Casas, 2002;Silva and Pereira, 2004;Simancas et al, 2006;Gumiel et al, 2010a; A C C E P T E D M A N U S C R I P T been used to explain the overall tectonic evolution of the Rio Tinto area.…”

mentioning

confidence: 99%

A new 3D geological model and interpretation of structural evolution of the world-class Rio Tinto VMS deposit, Iberian Pyrite Belt (Spain)

Martin-Izard

Arias

et al. 2015

Ore Geology Reviews

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A new 3D geological model and structural evolution of the Rio Tinto world-class VMS deposit is presented in this work. The Rio Tinto volcanogenic massive sulfide (VMS) deposit is located in the Spanish segment of the Iberian Pyrite Belt and is hosted by felsic porphyritic volcanic rocks and tuffs. Computer generated 3D modeling of the different orebodies and host rocks has been carried out using data from around 3,000 drill-core logs, allowing us to build 93 cross-sections and 6 plants (both 50 m spacing). This has enabled us to recognize of the geometry and relationships between the mineralization and the earliest Carboniferous transtensional tectonics through the development of an extensional pull-apart basin with two sub-basins separated by the NW-SE trending Eduardo Fault. The sub-basins, CerroColorado and San Dionisio, were limited by two E-W strike-slip faults, the Northern and Southern faults, and bounded in the east and west by the NW-SE-trending Nerva and Western faults, respectively. The generated pull-apart basin was first filled by a basaltic magmatism of mantle origin and later, following the deposition of the intermediate complex sedimentary unit, by rhyodacitic volcanic rocks of crustal origin. The evolution of the subsiding basins caused the development of an E-W oriented rollover anticline that affected these filling rocks.As a result of a counterclockwise rotation of the stress axes, the primitive pull-apart basin evolved into a basin affected by E-W transtensional sinistral shearing. Its northern and southern limits were favorable areas for increased hydrothermal fluid flow, which gave way A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 to the huge concentration of VMS mineralization located near the limits. The Northern and, to a lesser degree, the Southern extensional faults thus become channel areas for feeding and discharging of the VMS and stockwork ores. The main mineralizing period was related to this stage. Subsequently, during the Variscan transpressional phase, the E-W extensional faults were reactivated as inverse faults, affecting the volcanic sequence of mafic to felsic composition and the intermediate complex sedimentary unit. Fault propagation folds developed above these faults, affecting the massive sulfides, the transition series and the Culm flysch sediments, with buttressing playing a significant role in the geometry of tectonically inverted structures. The VMS mineralization and cupriferous stockworks were folded and dismembered from the original conduits in the volcanic series, and a dextral reactivation of the NW-SE trending faults also developed.Finally, it should be emphasized that this new 3D geological model is an approach to provide a better insight into the 3D structure of the world-class VMS Rio Tinto deposit and could be a key-point for further studies providing a new tool to increase knowledge of the VMS mineralizations and exploration guidelines elsewerein the IPB.

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Erratum to: Variscan tectonics in the Iberian Pyrite Belt, South Portuguese Zone

Abstract: Figures 1 and 4 were given incorrect and are reproduced correctly here.The online version of the original article can be found at http://dx.

Cited by 21 publications

References 0 publications

The Beja Layered Gabbroic Sequence (Ossa-Morena Zone, Southern Portugal): geochronology and geodynamic implications

The Beja Layered Gabbroic Sequence (Ossa-Morena Zone, Southern Portugal): geochronology and geodynamic implications

The Need for Accurate Geometric and Radiometric Corrections of Drone-Borne Hyperspectral Data for Mineral Exploration: MEPHySTo—A Toolbox for Pre-Processing Drone-Borne Hyperspectral Data

A new 3D geological model and interpretation of structural evolution of the world-class Rio Tinto VMS deposit, Iberian Pyrite Belt (Spain)

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