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Rayco Marrero-Diaz

Rayco Marrero-Diaz
Tragsatec, Grupo Tragsa · Gerencia Planificación y Gestión Hídrica

PhD in Hydrogeology

About

37
Publications
10,307
Reads
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353
Citations
Citations since 2017
7 Research Items
156 Citations
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20172018201920202021202220230102030
Additional affiliations
January 2012 - December 2017
Laboratório Nacional de Energia e Geologia
Position
  • PostDoc Position
September 2002 - December 2009
Instituto Tecnológico y de Energías Renovables
Position
  • PhD Student

Publications

Publications (37)
Preprint
Full-text available
In the XIX th century, the Alfama thermal and non-thermal springs were qualified as “mineral water” by the governmental authorities. But after a few years of legal usage in balneotherapy, all of them knew a constant and progressive definitive decay, and the last balneotherapic facility was abandoned and sealed more than 40 years ago. Despite their...
Book
Full-text available
Muchos son los peligros que afrontan las personas que trabajan en la minería del agua, la penosidad y peligrosidad de esta labor es evidente: desprendimientos, espacio confinado, temperaturas elevadas, atmósfera nociva, herramientas pesadas, explosivos, etc. Los datos manejados en la Guía incluyen las últimas medidas realizadas en 2020 y las conclu...
Article
Full-text available
Water galleries are one of the main systems for capturing groundwater on the western islands of the Canary Islands (Spain). Water galleries are approximately 2-m high × 2-m wide excavated, sub-horizontal drains. This research focuses on taking measurements of radon, a natural radioactive gas present in volcanic territories, such as the Canary Islan...
Article
Full-text available
The existence of several springs located in the Alfama district, Lisbon, Portugal, reported since the medieval Islamic period, are an important but almost unknown part of the history of the city. The word “Alfama” probably comes from the Arabic “Al-Hamma”, which means "hot spring". This historical importance is revealed through the diversified wate...
Article
The South Rif Thrust (Northern Morocco) is characterized by several thermo-mineral water sources with outlet temperatures ranging from 24 °C to 54 °C. The anomalous temperatures of these resurgences are linked to deep circulation in areas where the geothermal gradients are abnormally high (>35 °C km−1). Nonetheless, the factors that govern the geol...
Article
Full-text available
Seismic-volcanic unrest was detected between 2004 and 2005 in the central and northwest zones of Tenerife Island (Canary Islands, Spain). With the aim of strengthening the program of geochemical and seismic-volcanic surveillance, a study of the origin, characteristics, and spatial distribution of dissolved carbon dioxide (CO2) and helium (He) gases...
Article
The atmospheric chloride mass balance (CMB) method was used to estimate net aquifer recharge in Las Cañadas Caldera, an endorheic summit aquifer area about 2000 m a.s.l. with negligible surface runoff, which hosts the largest freshwater reserve in Tenerife Island, Canary Islands, Spain. The wet hydrological year 2005–2006 was selected to compare ye...
Conference Paper
Full-text available
The region of Lisbon is an urban area with the highest population density and energy demand in Portugal. It also presents very favorable geological environments for geothermal purposes. The historical and/or current existence of warm springs and deep sedimentary aquifers in Cretaceous and Jurassic formations, identified by hydrocarbon exploration s...
Article
Full-text available
We report herein the results of soil gas geochemistry studies, focused mainly on nonreactive and/or highly mobile gases such as He and H2, in five mining licenses at Tenerife and Gran Canaria, Canary Islands, Spain, during 2011–2014. The primary objective was to sort the possible geothermal potential of these five mining licenses, thus reducing the...
Article
Full-text available
In Alfama district (Lisbon, Portugal) the existence of numerous springs is widely documented since roman times. Some of them have thermal and/or minerals features. Nowadays there are no remains of these springs or any other in the zone with similar characteristics. In this work, based on bibliographic physical-chemical analysis, a study was conduct...
Chapter
Full-text available
As in most volcanic oceanic islands, groundwater represents more than 90% of available water resources in Tenerife Island (Canary Island, Spain). Understanding recharge dynamics is a key for water management as a basic element for a sustainable socioeconomic development. This work presents a preliminary estimation of yearly aquifer recharge in the...
Data
Full-text available
Carbon dioxide is one of the first gases to escape the magmatic environment due to its low solubility in basaltic magmas at low pressures. The exsolved CO2 gas migrates towards the surface through rock fractures and high permeability paths. If an aquifer is located between the magmatic environment and the surface, a fraction of the CO2 emitted is d...
Chapter
Full-text available
La región volcánica del Campo de Calatrava constituye una de las tres zonas de volcanismo reciente más importantes de la Península Ibérica. Durante el mes de Septiembre de 2007 se realizó una campaña geoquímica de gases para evaluar y calcular la tasa de emisión difusa de CO2 en tres zonas del Campo de Calatrava. La emisión total difusa de CO2 esti...
Article
Full-text available
We report the results of 11 soil CO2 efflux surveys by the accumulation chamber method at the summit cone of Teide volcano (SCT), Tenerife Island, Spain. The surveys were undertaken from 1997 to 2009 to determine the scale of total CO2 emissions at the SCT and to evaluate the temporal and spatial variations of CO2 efflux and their relationships wit...
Article
Water and gas sampling of natural discharges are the most common type of geochemical surveys for geothermal exploration. However, these natural discharges are generally scarces at geothermal exploration areas where the extent of the field is not known. Therefore, soil-volatile (Hg, As, Sb, NH3 and B) and soil-gas surveys (222Rn, CO2, He, H2, CH4, O...
Article
Full-text available
Volcanic aquifers commonly trap an important fraction of the main soluble components of fluids released from volcanic-hydrothermal system (CO2, SO2, H2S, HCl, HF, etc.). In particular, the interactions between volcanic gases and volcanic aquifers have been studied through hydrogeochemical parameters, as major and minor ions contents and dissolved g...
Article
Full-text available
El Hierro Island (278 km2) is one of the youngest and the southwesternmost of the Canary Islands and rises 4000 m above the sea floor. The main characteristics of El Hierro consist on a truncated trihedron shape and three convergent ridges of volcanic cones. Since fumarolic activity is absent at the surface environment of El Hierro, the study of th...
Article
We report herein the first results of two soil CO2 efflux surveys carried out at Cuicocha lake-filled and Pululahua caldera volcanic systems, Ecuador. A total of 172 and 217 soil CO2 efflux measurements were taken at the surface environment of Pululahua and Cuicocha calderas respectively, by means of the “accumulation chamber” method during the sum...
Article
Full-text available
Significant changes in the diffuse emission of carbon dioxide were recorded in a geochemical station located at El Hierro, Canary Islands, before the occurrence of several seismic events during 2004. Two precursory CO2 efflux increases started thirteen and nine days before two seismic events of magnitude 2.3 and 1.7, which took place near El Hierro...
Article
Carbon dioxide is one of the first gases to escape the magmatic environment due to its low solubility in basaltic magmas at low pressures. The exsolved CO2 gas migrates towards the surface through rock fractures and high permeability paths. If an aquifer is located between the magmatic environment and the surface, a fraction of the CO2 emitted is d...
Article
Precursory geochemical signatures of radon degassing in the subsurface of the Tenerife Island were observed several months prior to the recent 2004 seismic-volcanic crisis. These premonitory signatures were detected by means of a continuous monitoring of 222Rn and 220Rn activity from a bubbling CO2-rich gas spot located at 2.850m depth inside a hor...
Article
A seismic swarm started in April, 2004, to the west-northwest of Teide volcano, in Tenerife, Canary Islands. Teide volcano (3715 m high) is located at the northern scarp of Las Cañadas caldera, a large depression produced by multiple episodes of caldera collapse and giant landslides. The basanite-phonolite magmatic system and the hydrothermal syste...
Article
Las Cañadas caldera, located at the central part of Tenerife, Canary Islands, is a large volcanic depression (16 x 9 km). The caldera is opened to the sea at the north side and filled by continuous layers of lava flows and fall deposits. These volcanic deposits form a good hydrogeological trap which is the largest ground water reserve of the island...
Article
Teide volcano (3715 m high) is located at the northern scarp of the Las Ca¤adas caldera, a large depression at the center of Tenerife Island. Las Ca¤adas has been produced by multiple episodes of caldera collapse and giant landslides. The basanite-phonolite magmatic system associated with Teide volcano is emitting gases that reach the summit produc...
Article
Full-text available
Concentrations of soil gases (O 2, CO 2, N 2, H 2, He, Ar, Rn, and Hg vapor) and the efflux of carbon dioxide at the Ahuachapán Geothermal Field has been investigated. Soil pressure gradient and temperature were also measured. A grid of 196 points were sampled. Results show that higher concentrations of hydrothermal gases are found along fault zone...
Article
CO2 is the predominant carbon component in volcanic gases, and it is the least soluble of the major species in magmatic melts. The two remaining carbon components are CO and CH4. Most of the diffuse emission studies on volcanoes are related to CO2 but significant amounts of other C species in volcanic gases could be emited through the surface envir...
Article
Full-text available
Degassing magma is the primary source of Hg in volcano-geothermal systems; therefore, Hg is an important constituent in volcanic gases. Diffuse Hg0 degassing studies from Poás volcano have been yearly performed during the 2000-2003 period. Po s volcano is a large basaltic-andesite stratovolcano, located in the Central Cordillera of Costa Rica. The...
Article
Diffuse CO2 emission studies are becoming a useful geochemical tool for volcano monitoring. Significant temporal variations of diffuse CO2 degassing rate seem to be directy related to changes of activity volcanic. Since 1999 a research collaboration program between INETER and ITER has been established for monitoring diffuse CO2 emission from Cerro...
Article
We report the results of 11 soil CO2 efflux surveys at the summit cone of Teide volcano (SCT), Tenerife. The surveys were undertaken from 1997 to 2009 to determine the scale of total CO2 emissions at the SCT and to evaluate the temporal variations of CO2 efflux and their relationships with the volcanic-seismic activity. Our results reveal significa...

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