Searched for: mods_originInfo_publisher_s%3A%22Utrecht%255C+University%22
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Kruitbosch, Edwin (author)The early Eocene is characterised by transient greenhouse warming events marking perturbations of the global carbon cycle. Terrestrial geochemical proxies facilitate evaluation of these hyperthermal events - having durations in the order of 105 yr - in a high-resolution timeframe. The northern Bighorn Basin has provided such proxies for the...report 2021
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van der Looij, K.J.R. (author)Antigua is an island located on the volcanically extinct part of the lesser Antilles volcanic arc. The island contains a transition from volcanic, to volcaniclastic and pyroclastic and to carbonate rocks. Since the mapping of Martin-Kaye (1959) no research focusing on the whole island has been done. This study provides new data trough fieldwork...report 2019
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Brons, B. (author)Understanding the strain distribution along the Lesser Antilles is essential, because they form a seismic active region. The objective of this thesis is to pave the way for such understanding by providing new insights on the geological architecture and evolution of Antigua, a key area for Caribbean geodynamics, paleogeography and paleobiology....report 2019
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- Veenma, Y.P. (author) report 2018
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Marijnissen, K.A. (author)The dynamo of the solid inner core and liquid outer core gives rise to the Earth’s magnetic field, a field that changes in direction and intensity and can be reversed. This process of geomagnetic reversals is still poorly understood, because only a few sections have been recorded in high resolution, which are crucial to get a better...report 2017
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Tuinstra, K.B. (author)The reversal of the Earth’s magnetic field is a phenomenon that is not fully explained. Detailed volcanic records with high eruption rates that capture the behaviour of the Earth’s magnetic field, sampled in high resolution are scarce. Here we show the relative intensities of a mid-Miocene volcanic record, sampled in the East of Gran Canaria, in...report 2017
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van Ginneken, S. (author)It has been proposed that 400-kyr eccentricity is the driving force behind 4th order sea-level cycles in sequence stratigraphy during greenhouse times. However, this suggestion, which is mostly based on spectral peak ratios in the depth domain, is hard to verify due to lack of reliable age control with a resolution higher than or similar to the...report 2017
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van Klaveren, S.D. (author)Reversals of the Earth’s magnetic field are governed by complex processes in the liquid outer core, which are still not fully understood. Rock records that cover a reversal are rare. Here we show a high resolution directional description of a Mid-Miocene reversal captured in a thick basaltic sequence formed during the shield building phase of...report 2017
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Nap, A. (author)The Earth’s magnetic field is known to exhibit reversals in polarity. Such a reversal seems imminent to occur in the future, but little is known about the processes that govern such a reversal. We created a detailed record of a polarity reversal recorded in (Mid-Miocene) shield building lavas of Gran Canaria. In this part of the research we...report 2017
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Post, B. (author): The El Chichón volcano located in Chiapas, Mexico is known for its devastating eruption in 1982. After this eruption more research was done to improve its eruption history. Earlier works report 12 eruptions over the last 8000 years. However it is still incomplete and mainly tephra data on 1982 and 550BP eruptions are present. A distal tephra...report 2016
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van der Steeg, W. (author)The Bakhuis Granulite Belt of 30-40 x 100 km transects a large Paleoproterozoic TTG-greenstone belt in the Guiana Shield and is surrounded in its southern part by younger metavolcanics and associated granites. The granulite belt has experienced ultra high temperature metamorphism. The metamorphism was previously dated at 2072-2055 Ma. In the SW...report 2016
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Smits, K.D. (author)Little research has been done on recent environmental and climatic change in Mexico. This study presents an environmental reconstruction since the Postclassic Era (~ AD 1080) for the southeastern part of Mexico. A lacustrine core from laguna Chicuacan, located in the Grijalva watershed, Tabasco, Mexico has been analyzed on diatom and pollen...report 2015
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Hoogenboom, P.E. (author)Lake Awassa is a lake in the Ethiopian Rift Valley and undergoes a water level rise since the last few decades. Local people say that this increase is caused by an increase in surface runoff due to deforestation. Another hypothesis suggests that the water level rise is due to siltation of the lake by erosion and especially gully erosion. To...report 2013
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Broersen, T. (author)This study focused on explaining the spatially variable movement speeds of the Home Hill landslide in Tasmania, Australia, by assessing the landslide’s soil physical properties, in combination with performing a stability analysis using a combination of the hydrological model STARWARS, and a deterministic stability model based on the infinite...report 2013
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Hennekam, J.J. (author)Cuticle analysis is used as a paleo-precipitation proxy in boreal and subtropical environments. Here, this method has been applied successfully in the tropical Maya Lowlands (Tabasco, Mexico). Multiple proxies have already indicated the presence of severe drought episodes during the time of the Maya Collapse. By applying cuticle analysis on...report 2013
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Herder, C. (author)Water is the most essential requirement for all human activities such as drinking, agriculture and power generation. People would not survive without sufficient fresh water of good quality. Planet earth accommodates huge amounts of water, but only 1% is accessible as fresh water in lakes, rivers and aquifers (Jackson et al., 2001). The...report 2013
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oonk, P.B.H. (author)Volcanic crater lakes on Earth and the Martian surface have, at first sight, hardly anything in common. Crater lakes contain liquid water, are often set in andesitic host-rocks and cover a small area, while the Martian surface does not contain liquid water, is basaltic in composition and the scale of the geologic structures is much larger....report 2013
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van der Heijden, L.H. (author)The research included in this manuscript will allow scientists to better assess the impacts of ocean acidification (OA) on net community production and calcification rates. First, I collaborated with the European Free Ocean Carbon Dioxide Enrichment (eFOCE) project. eFOCE aims to better understand and project the impacts of OA by precisely...report 2013
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van Bree, L.G.J. (author)One of the large and increasingly important global problems is coastal eutrophication. Human disturbances includes large-scale fertilizer use which increases the nutrient availability in many coastal areas and can lead to toxic algal blooms or ecosystem turnover. Detecting past human disturbances in an area can improve the understanding of the...report 2012
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van der Boon, A. (author)The Maikop series are composed of a thick succession of black shales, and are considered the most important source rock for hydrocarbons in the Caspian basin. The type section of this formation is located near the city of Maykop in Russia, north of the Greater Caucasus. Corresponding anoxic sediments can be traced in a vast area from Austria to...report 2012
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