A new gravity survey (1164 gravity stations and 180 samples for density analysis) combined with two new geological cross sections has been carried out in a sector of the Central Pyrenees in order to improve the characterization of basement and cover architecture. From North to South, the study area comprises the southern half of the Axial Zone and the northernmost part of the South-Pyrenean Zone. New gravity data were combined with previous existing databases to obtain the Bouguer and residual anomaly maps of the study area. The two cross sections, oriented NNE–SSW, were built from field data and previous surficial and subsurface data and cross the La Maladeta plutonic complex. The residual anomaly map shows values ranging from −18 to 16 mGal and anomalies mainly oriented N120E. The two 2.5D modelled cross sections show similar observed gravity curves coinciding with similar interpreted structural architecture. Data show a gravity high oriented N120E coinciding with the Orri basement thrust sheet and an important gravity depression, with the same orientation, coinciding with the leading edge at depth of the Rialp basement thrust sheet and interpreted as linked to a large subsurface accumulation of Triassic evaporites. The volume at depth of the La Maladeta and Arties granites has been constrained through gravity modelling. This work highlights that the combination of structural geology and gravity modelling can help to determine the structural architecture of an orogen and localize accumulations of evaporites at depth.
In this work we establish reliable correlations between density and magnetic susceptibility in three paramagnetic granites from the Pyrenees. In total, 128 sites (310 density measurements and >2600 susceptibility ones) were studied in the Mont Louis-Andorra, Maladeta and Marimanha granitic plutons covering the main range of variability of magnetic susceptibility. Regressions were calculated for every granitic body and an integrated linear function was obtained for the entire dataset: ρ (kg/m3) = 2566 (kg/m3) + 0.541κ (10−6 S.I.) (R:0.97). This relationship is only valid in the paramagnetic domain, where iron is mostly fractioned in iron-bearing phyllosilicates and the occurrence of magnetite is negligible (or at least its contribution to the bulk susceptibility). This relationship, likely different in other bodies, allows for transforming magnetic susceptibility data into density data, helping to constrain gravity modelling when density data from rock samples are scarce. Given the large amount of AMS studies worldwide, together with the quickness and cost-effectiveness of susceptibility measurements with portable devices, this methodology allows for densifying and homogenizing the petrophysical data when modelling granite rock volumes based on both magnetic and gravimetric signals.
<p>Deception Island is one of the most active volcanoes in Antarctica, with more than 20 monogenetic eruptions during the Holocene. The latest episodes of 1967, 1969 and 1970 have shown that volcanic activity on Deception Island can become a concern for tourists, scientists, and military personnel working on or near the island.</p><p>The objective of this work is, therefore to identify eruptive processes and the evolution of post-caldera volcanic edifices at Deception Island by morphometric analysis, supported by field observations. This methodology has been used since the 1970s to analyse mafic monogenetic volcanoes but it has not been fully developed until recently.</p><p>Tuff cones and rings, as a result of magma-water interaction, represent the most common eruptive events occurring during Deception Island's recent geological past and are therefore the most likely to occur in the near future. This work provides an opportunity to incorporate for the first time at Deception Island geomorphological observations for a better comprehension of the potential evolution of a future eruption and for a broader understanding of volcanic hazards on this island.</p><p>This research was supported by the MICINN grant CTM2011- 13578-E and was partially funded by the POSVOLDEC project (CTM2016-79617-P) (AEI/FEDER-UE). A.G. is grateful for her Ram&#243;n y Cajal contract (RYC-2012-11024). D.P. is grateful for his Beatriu de Pin&#243;s (2016 BP 00086) and Juan de la Cierva (IJCI-2016-30482) contracts. This research is part of POLARCSIC and AntVolc&#160;activities</p>
<p>Earth Sciences are booming in social media, an unexampled scenario a few years ago. In the last year, these numbers have increased because of the COVID-19, citizens are consuming even more digital information, at the same time they are looking for more simplified and easy-understanding scientific concepts. It is very important to remark the value of entertainment, humor, and visual contents, which have a light universal language to approach Earth Sciences to citizens and experts beyond the pure academic frontiers. In this work, we share some successful examples through the use of illustration, comic, and infographic content between two Instagram accounts (<strong>@ohmagmamia</strong> and <strong>@salirconunageologa</strong>) which addend more than 13,000 followers and have a potential reach up to 37.1k (based on their account insights). The audience for this content is international although it has gained great popularity among the Spanish-speaking public (the initial target audience), little by little creating an interesting and growing movement. Countries such as Chile, Argentina, Colombia, and Spain have the greatest impact according to statistics. Age range is between 18-34 years for 87% of the audience, with a clearly female predominance (55% in @Ohmagmamia and 60% in @Salirconunageologa).</p><p>One of the principal goals of these accounts is to develop visual, artistic and easy-understanding content that fits the audience. On one hand @Ohmagmamia uses photographic material (e.g. landscapes, outcrops, hand specimen samples or micro-photographies), simple geological sketches and infographic content along with small descriptions in the post captions. This approach has been well received by both Earth Science students and non-professional enthusiasts, as well as biology-geology teachers and public examination trainers. On the other hand, @Salirconunageologa (Dating a geologist) uses cartoons, humour and comics to approach Earth Sciences to professionals and the general public. Its visual material focuses on storytelling to explain what it means to be a geologist using all its universe of friendly characters. In the first season of &#8220;Dating a Geologist Universe&#8221; (with 17 episodes), the main character, Nia Stone, is involved in different hilarious situations related to Earth Sciences, like volcanoes, trilobites, or Dr. Gems (the main Villain). This &#8220;<strong>geocomics&#8221;</strong> have been very well received, being the first chapter the one which records the best audience data, with 10k accounts reached on Instagram.&#160;</p><p>Social media statistics data provide interesting information about the success of these scientific dissemination&#8217;s new methods. In the last 6 months of the 2020 both accounts reached an average of 11,000 Instagram accounts with an average more than 1,000 &#8220;likes&#8221; per post and with an engagement rate that varies from 9 to 12%. In addition, the use of other social media such as Twitter or YouTube able us to reach more people and/or accounts by using Twitter &#8220;threads&#8221; or sharing videos of invite talks or &#8220;webinars&#8221;, whose popularity grew during the quarantine period. All these results show the importance of a perfect relation between visuals, art and Earth Science and its capability to reach people from all around the globe.</p>
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