Oscar Baeza

Universität Trier · Department of Geology

Gypsum (GPS) has great potential for structural fire protection and is increasingly used in construction due to its high-water retention and purity. However, many researchers aim to improve its physical and mechanical properties by adding other organic or inorganic materials such as fibers, recycled GPS, and waste residues. This study used a novel...

Estimating the amount of material without significant losses at the end of hybrid casting is a problem addressed in this study. To minimize manufacturing costs and improve the accuracy of results, a correction factor (CF) was used in the formula to estimate the volume percent of the material in order to reduce material losses during the sample manu...

Link (expring on March 4th, 2022): https://authors.elsevier.com/a/1ePUpB8ccudKN Rock weathering and pedogenesis are fundamental processes for element mobility in terrestrial bio-geochemical cycles and for the regulation of primary productivity in adjacent coastal marine ecosystems. Here, soils developed from volcanic ash under extreme climate cond...

The 1.5-km-wide, 40-m-deep, crater-like structure in the 10 Ma old Barda Negra basaltic plateau in Central Argentina was discovered in the early 2000s. Based on remote sensing surveys and on its morphological characteristics, similar to those of the Barringer crater in Arizona, the structure is described to be originated by an impact. In this study...

Free access link before May 19, 2020: https://authors.elsevier.com/a/1apgY-JmAmJeR Organic-rich sediments of the southernmost Chilean Pacific coast and its fjord system constitute an important component of the global marine carbon budget. Sediment records from Trampa and Caribe bays and Churruca fjord in the western Magellan fjord system have been...

Pockmarks are variably sized crater-like structures that occur in young continental margin sediments. They are formed by gas eruptions and/or long-term release of fluid or gas. So far no pockmarks were known from the Pacific coast of South America between 51°S and 55°S. This article documents an extensive and previously unknown pockmark field in th...

MOURA magnetometer and gradiometer is part of the scientific instrumentation for Mars MetNet Precursor mission. This work describes the objective of the investigation, summarizes the work done in the design and development of the sensor as well as its calibration, and shows the demonstration campaigns to show the potential of such instrument for pl...

Satellite-based magnetic measurements of Mars indicate complex and very strong magnetic anomalies, which led to an intensive and long-lasting discussion about their possible origin. To make some progress in the investigation of the origin of these anomalies the MOURA vector magnetometer was developed for in situ measurements on Mars. In this work w...

Satellite-based magnetic measurements of Mars indicate complex and very strong magnetic anomalies, which led to an intensive and long-lasting discussion about their possible origin. To investigate the origin of these anomalies MOURA vector magnetometer was developed for future on ground surveys on Mars and tested on various terrestrial analogues ch...

Significance The Drake Passage (DP) represents the most important oceanic gateway along the pathway of the world’s largest current: the Antarctic Circumpolar Current (ACC). Resolving changes in the flow of circumpolar water masses through the DP is crucial for advancing our understanding of the Southern Ocean’s role in affecting ocean and climate c...

The Drake Passage (DP) is the major geographic constriction for the Antarctic Circumpolar Current (ACC) and exerts a strong control on the exchange of physical, chemical, and biological properties between the Atlantic, Pacific, and Indian Ocean basins. Resolving changes in the flow of circumpolar water masses through this gateway is, therefore, cru...

In the Patagonian Andes erosion by temperate Pleistocene glaciers has produced a deeply incised fjord system in which glacial and non-glacial sediments were deposited since the Late Glacial glacier retreat. So far, fjord bathymetry and structures in the sediment infill were widely unexplored. Here we report the results of an investigation of morpho...

Holocene denudation rates and their regional variations in the superhumid and temperate climate of the southernmost Patagonian Andes are poorly surveyed. Therefore we have investigated denudation in five small lake catchments (0.11–1.62 km2) across a precipitation gradient from 600 to > 9000 mm yr− 1 in southernmost Chile at 53°S. Variations in den...

10 RESUMEN Los sistemas de terrazas evidencian que el Seno Otway y Skyring y el fiordo de Última Esperanza, formaron el mayor sistema lacustre proglacial interconectado de la Patagonia Austral (5.700 km 2) durante la deglaciación temprana (< 18 a 14 ka BP). Este sistema drenaba por el este del Seno Otway hacia el Atlántico. El retroceso de los glac...

Tadpoles of Amietia ruwenzorica (Pyxicephalidae, Cacosterninae) were collected in the Ruwenzori Mountains, Uganda (identified by DNA barcoding). The ventrally directed enlarged oral disc with a high number of labial tooth rows (LTRF 9(4)/9(1)) and the narrow tail with robust caudal musculature characterise them as stream-dwellers. We name this morp...

The Southern Patagonian Icefield (PIF) constitutes the largest continental ice-sheet outside the polar regions. Its Holocene glacier fluctuations and their forcing mechanism are still poorly explored, especially on the western hyperhumid side of the Andes. Glacier fluctuations have been previously constrained by 14C and/or cosmogenic ages of morain...

Glacial millennial-scale paleoceanographic changes in the Southeast Pacific and the adjacent Southern Ocean are poorly known due to the scarcity of well-dated and high resolution sediment records. Here we present new surface water records from sediment core MD07-3128 recovered at 53°S off the Pacific entrance of the Strait of Magellan. The alkenone...

Glacial millennial-scale paleoceanographic changes in the Southeast Pacific and the adjacent Southern Ocean are poorly known due to the scarcity of well-dated and high resolution sediment records. Here we present new surface water records from sediment core MD07-3128 recovered at 53°S off the Pacific entrance of the Strait of Magellan. The alkenone...

Cenozoic denudation rates are sparsely known for the southernmost Patagonian Andes. One of the scientific approaches is to calculate long-term denudation rates based on fission track analyses. Though, these average rates comprise a long period with distinct climate conditions and very different extend of glaciation. These integrated denudation rate...

Postglacial changes in the latitudinal pattern and intensity of the Southern Hemispheric Westerly Wind Belt (SHW) are still poorly constrained and discussed controversially. Here we address the postglacial SHW evolution based on new and also published data from the southwest coast of South America between 33 and 54°S. Three marine and one lacustrin...

In the Western Strait of Magellan in southernmost Chile marine transgression occurred between 14,500 and 13,500 cal. BP. This is indicated by strongly increased accumulation of biogenic carbonate and first appearance of foraminifers in sediment records. From that time until 11,500 cal. BP, sedimentation in the western fjords became predominant auto...

This study presents paleoenvironmental proxies for the last 16.000 cal. years B.P. as determined in two sediment cores retrieved from the Western Strait of Magellanes. Overall goal was to determine the biogenic and terrigenous sediment fluxes and their relationship to paleoenvironmental changes. The chronology is based on well-dated tephra layers f...

Ecosystems damaged by distal volcanic ash and sulfur deposition usually recover within decades. However, sediment, stalagmite, and pollen records from the southernmost Andes indicate a 2000 yr impact on forest and aquatic ecosystems after deposition of a thin tephra layer. SO2 released from altering pumice produced intense soil and lake acidificati...

Late Glacial to Holocene ice retreat was investigated along a 120 km long fjord system, reaching from Gran Campo Nevado (GCN) to Seno Skyring in the southernmost Andes (53°S). The aim was to improve the knowledge on regional and global control on glacier recession with special emphasis on latitudinal shifting of the westerlies. The timing of ice re...

Environmental and climatic changes during the last 20,000 years were investigated along an east-west transect across the southernmost Andes (53°S) within the interdisciplinary project "Late and Post Glacial Environmental Conditions in the Range of the Southern Hemispheric Westerlies". Twelve coring locations in the different geographical, geologica...

The mainly volcanic Cenozoic deposits that make up much of the western part of the Principal Cordillera in Central Chile are generally subdivided into two major units: an older Abanico or Coya-Machalı́ Formation and a younger Farellones Formation. Difficulty in differentiating these units has led to considerable debate. On the basis of the wide dis...