M. Calvo-Rathert

M. Calvo-Rathert
Universidad de Burgos | UBU · Department of Physics

PhD

About

107
Publications
13,324
Reads
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852
Citations
Additional affiliations
October 2000 - present
Universidad de Burgos
Position
  • Professor (Full)
October 1997 - June 2013
Universidad de Burgos
October 1997 - October 2000
Universidad de Burgos
Position
  • Professor (Associate)
Education
September 1986 - January 1992
Complutense University of Madrid
Field of study
  • Geophysics - Paleomagnetism
October 1977 - January 1984

Publications

Publications (107)
Article
Full-text available
We present initial rock magnetic results for both lava flows and lapilli produced by the 2021 eruption of the Cumbre Vieja, La Palma (Canary Islands). Samples were taken during the eruption to minimize early alteration and weathering of the rocks and tephra. Standard procedures included progressive alternating field and thermal demagnetization, hys...
Article
We present new radiometric ages and full-vector paleomagnetic data from São Vicente Island, Cape Verde. Samples were obtained from a sequence of 11 nephelinitic flows. A K-Ar age determination was performed on the lowermost flow of the sequence, yielding an upper Miocene age of 6.07 ± 0.16 (2σ) Ma. Considering the normal polarity observed in all fl...
Article
We present new radiometric ages and full-vector paleomagnetic data from São Vicente Island, Cape Verde. Samples were obtained from a sequence of 11 nephelinitic flows. A K-Ar age determination was performed on the lowermost flow of the sequence, yielding an upper Miocene age of 6.07 ± 0.16 (2σ) Ma. Considering the normal polarity observed in all fl...
Article
Full-text available
We report an archeomagnetic study from the Early Iron Age archeological site of Cerro de San Vicente (Salamanca, Spain). The studied materials were sampled from one roundhouse and its central fireplace, a surrounding burnt floor, and slags with a twofold objective. First, to archeomagnetically determine the last use of the central fireplace, becaus...
Article
Full-text available
We report paleointensity results obtained with the multispecimen method (MSP) over the Pliocene sequence of Apnia (Georgia) which records a polarity reversal. Paleointensity determinations with the multispecimen technique were performed on 12 flows with the original (MSP‐DB) and the domain‐state corrected (MSP‐DSC) protocol. Eight MSP‐DSC determina...
Article
Full-text available
Sixteen rhyolitic and dacitic Cretaceous and Paleocene‐Eocene lavas from the Lesser Caucasus have been subjected to paleomagnetic and multimethod paleointensity experiments to analyze the variations of the Earth's magnetic field. Paleointensity experiments were performed with two methods. Thellier‐type experiments with the IZZI method on 65 specime...
Article
Well-exposed lava sequences with available geochronological information may provide invaluable information on the fine characteristics of the Earth's magnetic field variation. A paleomagnetic study has been performed on twenty Pleistocene age, sub-horizontal lava flows in the Javakheti Highland (Lesser Caucasus). The sequence is formed by calc-alka...
Article
The Galería Complex is a cave sediment succession at the Atapuerca paleoanthropological site (Burgos, Spain) that offers detailed environmental information about the late Middle Pleistocene, especially the period between marine oxygen isotope stages MIS10 and MIS7. Previous studies have reconstructed the chronology and detailed the environmental de...
Article
This study presents new high precision age and full-vector archaeomagnetic data from a kiln excavated in the Roman archaeological site of Mitreo's house (Mérida, Badajoz, Spain). The age of the kiln was obtained by the stratigraphic method and by the ceramological study of the italic and sigillata pottery found with a very precise age date of 55 ±...
Article
Full-text available
The progressive southward reoccupation of territories of the Iberian Peninsula by the Christian kingdom against the Muslims from the eighth century AD onwards is a well-known process. However, there are few well-dated sites of this period, especially in the northern plateau of Spain. Here we report the full vector archaeomagnetic dating of two hear...
Article
Full-text available
The radiocarbon technique is widely used to date Late Pleistocene and Holocene lava flows. The significant difference with palaeomagnetic methods is that the 14C dating is performed on the organic matter carbonized by the rock formation or the paleosols found within or below the lava flow. On the contrary, the archaeomagnetic dating allows to date...
Article
Full-text available
A paleointensity study has been carried out on a Pliocene sequence of 20 consecutive lava flows where previous directional results seem to reflect anomalous behavior of the Earth’s magnetic field (EMF), which can be explained by a polarity transition record or non-averaged paleosecular variation or both. Here, we perform a total of 55 paleointensit...
Article
Archaeointensity determinations on burnt archaeological material are complex and reliable data scarce, although this kind of material can be of great interest in archaeological investigations. With the goal of analysing the reliability of archaeointensity determinations, an interlaboratory comparison study has been performed combining different exp...
Article
Full-text available
In this study, we implement multi-method approach to obtain higher quality and reliability of absolute paleointensity values compared to those obtained through the usual procedures that consist of a single paleointensity determination method. This new protocol is motivated by previous studies in which the reliability of the available paleointensiti...
Article
Teotihuacan, the most important city of the Americas during the Classic period, developed a deep and complex civilization without any written histories. This millennial culture mostly used pictorial forms of visual communication expressed in numerous mural paintings. Thus, the knowledge of the absolute chronology of some of the most important mural...
Article
Full-text available
We report a detailed paleomagnetic study on two Plio‐Pleistocene lava flow sequences from the Djavakheti Highland, Lesser Caucasus. The Korkhi sequence is composed of two volcanic successions of distinct age (1.9 and 3.1 Ma), while the Apnia sequence was emplaced between 3.8 and 3.1 Ma according to available radiometric datings. Normal, reverse and...
Article
Full-text available
Recent studies have demonstrated that rock-magnetic analysis may provide additional information to distinguish and characterize extreme marine inundation events such as tsunamis. Rock-magnetic proxies reinforce and improve the environmental evidences supplied by other methods, adding some decisive clues for the interpretation of the origin and...
Article
The Cretaceous Normal Superchron is a period of great interest to investigate global scale variations of the geomagnetic field. Long periods of single polarity are still a matter of debate: up to now there are two contradicting theories, which try to relate geomagnetic field intensity and reversal rate. We aim to shed light on the geomagnetic field...
Conference Paper
Full-text available
The Djhavakheti Highland volcanic region in the central sector of the Lesser Caucasus (South Georgia) is one of the largest neo-volcanic areas of the Caucasus. It displays an eruptive activity that provides long and continuous sequences of basaltic lava flows whose mineralogy is capable to record in a reliable way the direction and intensity of the...
Article
Full-text available
We present preliminary rock magnetic results and paleodirections from a Cretaceous alkaline dyke swarm in the Asunción Rift, Eastern Paraguay. Previous investigations suggest that these dykes extruded in a rather short period of time, in the period 126-127 Ma, during normal and reversed polarity field configuration (Velazquez et al., 2011). Paleodi...
Conference Paper
Full-text available
Resumen: La región volcánica de Djavakheti se caracteriza por una actividad plio-pleistocena que generó un gran número de flujos de lava consecutivos. Estas características, combinadas con las dataciones K-Ar disponibles (Lebedev et al., 2008 y 2014 com. pers.), proporciona un registro adecuado para el estudio del campo magnético terrestre (CMT). E...
Conference Paper
Full-text available
Resumen: Se tomaron muestras de 16 lavas dacíticas y riolíticas de edad paleógena y cretácica cerca de la ciudad de Bolnisi, en el sur de la República de Georgia con dos objetivos: (i) Obtener nuevos resultados paleomagnéticos para la región del Cáucaso y (ii) aportar nuevos datos de paleointensidad correspondientes a unos periodos, el Cretácico y...
Article
Sixteen Miocene, Pleistocene and historic lava flows have been sampled in Lanzarote (Canary Islands) for paleointensity analysis with both the Coe and multispecimen methods. Besides obtaining new data, the main goal of the study was the comparison of paleointensity results determined with two different techniques. Characteristic Remanent Magnetizat...
Article
We report 28 successful Thellier type absolute geomagnetic paleointensity determinations from a Pleistocene lava sequence composed of 39 successive flows in the Djavakheti Highland (Lesser Caucasus, Georgia). Additionally, multispecimen technique provided the estimation of geomagnetic field strength for 12 independent cooling units. Paleointensity...
Conference Paper
Full-text available
A paleomagnetic and rock magnetic study has been carried out on 16 dacitic and rhyolitic lavas of Cretaceous and Paleogene age to find out their suitability for absolute paleointensity determinations. Experiments were aimed to obtain information about the characteristics of the remanence recorded in the lavas, to find out the carriers of remanence...
Conference Paper
Full-text available
Paleomagnetism and rock magnetism experiments were carried out on the Pliocene Apnia sequence. This sequence consists of basaltic flows with K-Ar ages between 3.70 ±0.20 and 3.09 ±0.10 Ma, and is located in the western Djavakheti Highland, one of the most important volcanic regions of the Lesser Caucasus. Previous paleomagnetic studies on different...
Conference Paper
Full-text available
RESUMEN Reportamos cuarenta y seis determinaciones de paleointensidad absoluta, en una secuencia pleistocena de 39 flujos de lava consecutivos ubicados en la Meseta de Djavakheti, en el Cáucaso Menor, en Georgia. Las edades radiométricas y los datos paleomagnéticos existentes, sugieren dos posibilidades. Los 36 flujos de la parte inferior de la sec...
Article
Full-text available
Reliable paleomagnetic data from the Caucasus area, part of the Alpine-Himalayan fold belt, are still sparse if compared to other regions of this fold belt, since the methodology employed in many of the studies carried out before the nineteen-nineties often does not fulfil the minimum reliability and quality criteria required for present-day paleom...
Article
A detailed palaeomagnetic, rock-magnetic and palaeointensity study has been carried out on a Miocene volcanic sequence which consists of 39 consecutive lava flows recording a polar- ity transition in La Gomera (Canary Islands, Spain). In addition, new 40Ar/39Ar ages were obtained in two flows, yielding 9.63±0.06 Ma in the lower and 9.72±0.08 Ma in...
Article
Full-text available
Reliable paleomagnetic data from the Caucasus area, which forms part of the Alpine-Himalayan orogenic belt, are still sparse if compared to other regions of this fold belt, since the methodology employed in many of the studies carried out before the nineteen-nineties often does not fulfil the minimum reliability and quality criteria required for...
Chapter
Direction and strength of the Earth’s magnetic field vary with time. The changes produced by the main field, which is generated by magnetohydrodynamic processes in the Earth’s liquid iron outer core, display periods of the order of a year to millions of years. Analysis of the remanent magnetization recorded by rocks, sediments, and archaeological m...
Conference Paper
Full-text available
Paleomagnetic studies have been conducted in the Pyrenees (and in its foreland basins) since the earlier sixties and have continued duringthe next decades, particularly increasing in the nineties. At the moment, the research interest is still growing as regards of the increasing in number of publications. This vast amount of data is due to several...
Conference Paper
Full-text available
A rock magnetic study has been carried out on a sedimentary sequence in the Galería cave in the Sierra de Atapuerca karst system, which is located in the Duero Basin (northern Spain). This cave belongs to the world-famous archaeological site of Atapuerca which contains hominin remains of Pleistocene age. In the present study, four (G.I to G.IV) fr...
Article
Full-text available
Since the early times of paleomagnetism, volcanic rocks have been the subject of numerous investigations, in part because their stronger intensity of remanence allowed an easier measurement. The paleomagnetic study of volcanic rocks undeniably beneÀted from the fact that more than half a century ago, Luis Néel was able to provide a theory for the a...
Article
Full-text available
A palaeomagnetic and rock-magnetic investigation has been carried out on a Pliocene lava flow sequence in the Djavakheti Highland in the central Lesser Caucasus in the Republic of Georgia. In addition, a 40Ar/39Ar dating and electronic microscopic studies were performed on samples of this sequence, named the Saro section, which consists of 39 succe...
Data
Full-text available
We present new archaeointensity data from Georgia from ca. 3000 BCE to 1500 CE. Forty-eight potsherds and fired clays were subjected to Thellier-type paleointensity experiment using the IZZI protocol (Tauxe and Staudigel, 2004) with routine pTRM check. We observed an excellent agreement between samples collected from the same site, supporting the p...
Article
Full-text available
The Pacific coast of Mexico has repeatedly been exposed to destructive tsunamis. Recent studies have shown that rock magnetic methods can be a promising approach for identification of tsunami- or storm-induced deposits. We present new rock magnetic and anisotropy of magnetic susceptibility (AMS) results in order to distinguish tsunami deposits in t...
Article
A paleomagnetic, rock-magnetic and paleointensity study has been carried out on 14 basaltic lava flows from two Pliocene (K-Ar age between 3.09 +/- 0.10 Ma and 4.00 +/- 0.15 Ma) sequences (Apnia and Korxi) from the eastern Djhavakheti Highland in southern Georgia (Caucasus). Measurement of strong-field magnetisation versus temperature curves yielde...
Article
Full-text available
[1] The firm relationship between archeomagnetic samples and their absolute ages, which is usually determined or estimated using a variety of methods (archaeological context, thermoluminiscense, C14, etc.), is crucial in any archaeomagnetic investigation. In this paper, we report 18 successful (from 65 analyzed) archaeointensity determinations of h...
Article
Full-text available
A rock-magnetic and paleomagnetic investigation was carried out on eleven Pleistocene and Pliocene 40Ar/39Ar dated lava flows from the Tepic-Zacoalco rift region in the western sector of the Trans-Mexican Volcanic Belt (TMVB) with the aim of obtaining new paleomagnetic data from the study region and information about the Earth’s magnetic field reco...
Article
Full-text available
Detritic deposits with siliceous cement located at the SW and W of the Duero basin (Areniscas Salamanca Formation) have been considered Cenozoic and more recently they have been ascribed to the Upper Cretaceous-Paleocene. In order to provide new data about their controversial age, a paleomagnetic study on two of the most representative outcrops of...
Article
Full-text available
This article presents the first palaeomagnetic results from 13 independent cooling units in the Chiapanecan Volcanic Arc (ChVA). Six sites were directly dated by Ar–Ar or K–Ar methods: their dates range from 2.14 to 0.23 Ma. We isolated the characteristic palaeodirections for all 13 lavas. Eleven non-transitional directions yield a mean direction w...
Conference Paper
Full-text available
Resumen: Se presentan resultados preliminares de magnetismo de rocas y paleomagnetismo realizados en luna secuencia de coladas basálticas (Saro), en el sur de Georgia. Se cuenta con 39 coladas con una edad de 2.2 Ma (Lebedev et al., 2008). Los análisis de las curvas termomagnéticas permiten distinguir cuatro tipos de muestras: a) Tipo H, muestras c...
Conference Paper
Full-text available
Resumen: Se ha llevado a cabo un estudio de paleomagnetismo, magnetismo de las rocas y paleointensi-dad en 16 coladas pliocenas de la meseta de Djavakheti (Cáucaso Menor, Georgia). En las medidas de la magnetización en función de la temperatura, se pudieron reconocer tres tipos de curvas termomagnéticas: (i) Curvas reversibles con magnetita como ún...
Article
This study tests if burnt soils and sediments can provide reliable records of geomagnetic field strength at the time of burning by carrying out an experiment to reproduce the prehistoric use of fire on a clayish soil substratum. Rock magnetic experiments showed that in the upper 0–1 cm of the central part of the burnt surface, remanence is a thermo...
Article
The paleosecular variation (PSV) and polarity transitions are two major features of the Earth’s magnetic field. Both PSV and reversal studies are limited when age of studied units is poorly constrained. This is a case of Central and western Mexico volcanics. Although many studies have been devoted to these crucial problems and more than 200 paleoma...
Conference Paper
Full-text available
Resumen Este trabajo presenta resultados preliminares sobre los experimentos de magnetismo de rocas y paleomagnetismo realizados en una secuencia de coladas basálticas (Saro) con una edad estimada en 2,0 a 2,2 Ma mediante dataciones radiométricas con el método K-Ar (Lebedev et al, 2008), localizada en la meseta de Dzavakheti, en el sur de Georgia....
Article
Full-text available
We present rock-magnetic and paleomagnetic results obtained on samples belonging to a Neogene sequence of 11 successive lava flows and a dyke from La Gomera (Canary Islands, Spain). Analysis of thermomagnetic curves allows to distinguish three types of samples: (i) Type H samples with low-Ti titanomagnetite as the only carrier of remanence; (ii) ty...
Article
Full-text available
We report detailed rock-magnetic and paleomagnetic directional data from 35 lava flows (302 standard paleomagnetic cores) sampled in the Central-Northern region of Uruguay in order to contribute to the study of the paleosecular variation of the Earth’s magnetic field during early Cretaceous and to obtain precise Cretaceous paleomagnetic pole positi...
Article
Full-text available
Despite of the impressive cultural heritage and abundant archaeological sites, absolute geomagnetic intensity data from Mesoamerica are still sparse. Archeointensity determinations using the Coe variant of the Thellier and Thellier method have been carried out on some selected pottery fragments from the El Opeño archeological site which has the ear...