Abstract
ABSTRACT The Sierra Bermeja Pluton (∼60 km2 surface area) exemplifies a type of controversial granites of the Iberian Massif (European Variscan Belt), the cordierite-bearing ‘Serie Mixta’ (mixed series) monzogranites. The pluton is included almost completely in the Cornalvo Natural Park (Badajoz, Spain), a relevant target area in Roman times. The geological mapping summarised in the presented map at 1:10,000 scale has revealed a complex intrusive assemblage. Three main cordierite-bearing monzogranite types that show local varieties constitute most of the massif. Monzogranite intrusions are younger towards the centre of the pluton and gave rise to outstanding mappable mingling/mixing zones in some areas. A NE–SW trending reduced dyke complex composed by vaugnerite series rocks, lamprophyres, aplites and quartz dykes, completes the lithological assemblage of the pluton. An inventory of Geologic Points of Interest to promote the geological knowledge of this remarkable protected area and its geoconservation is also presented.
Highlights
Precise geological maps constitute the basis of studies such as those applied in resources exploration, civil engineering, environmental geosciences and natural hazards (Lisle, Brabham, & Barnes, 2011)
The Sierra Bermeja Pluton is a 59.75 km2 elongated trapezoidal-shape intrusion (5.0–7.0 km width; 9.5– 12.0 km length), with the long axis oriented N120°E. This massif encompasses several cordierite-bearing monzogranite lithotypes that can be grouped into three main units, which according to their roughly spatial concentric arrangement have been termed as Outer Unit (OU), Middle Unit (MU) and Inner Unit (IU)
Three main monzogranite types plus a reduced dyke complex composed by vaugnerite series rocks, lamprophyres, aplites and quartz dykes constitute this Variscan massif
Summary
Precise geological maps constitute the basis of studies such as those applied in resources exploration, civil engineering, environmental geosciences and natural hazards (Lisle, Brabham, & Barnes, 2011) Their accuracy is decisive to prevent severe economic and/or human losses, and the progress of the scientific knowledge requires as well accurate maps. According to IUGS procedures, geological map sheets, at least at scale of 1:50,000, are needed in order to display, among others, the location and extent of a Geosite (Wimbledon et al, 2000) In this contribution we present a detailed geological map at 1:10,000 scale of a composite granitic pluton, the Sierra Bermeja Pluton, which is encompassed in part within a protected area of remarkable natural and historical interest, the Cornalvo Natural Park (Badajoz province of Spain). The map includes a thorough inventory of noticeable geological (Geological Point of Interest, GPI; Table 1) and of other nature sites of interest (Main Map) aimed to be taken into account by the Cornalvo Natural Park administration in terms of geoconservation and geological heritage
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