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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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Smits, S.E. (author)
report 2020
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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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Boersma, Q. (author), Prabhakaran, R. (author), Hilario Bezerra, F. (author), Bertotti, G. (author)
In carbonate rocks, channelized fluid flow through fracture conduits can result in the development of large and connected karst networks. These cavity systems have been found in multiple hydrocarbon and geothermal reservoirs, and are often associated with high-permeability zones, but also pose significant challenges in drilling and reservoir...
report 2019
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den haan, S.F. (author)
report 2019
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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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Veenma, Y.P. (author)
report 2018
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Kruitbosch, E. (author)
report 2018
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Pragt, A.N. (author)
report 2018
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de Hoop, S. (author), Prabhakaran, R. (author)
The fieldwork was focussed on quantification of the morphological features of hypogenic karst caves in Brazil using 3D LIDAR (Light Detection and Ranging) and Drone Imagery. The fieldwork was conducted along with several partners as part of the Porocarste 3D project which is a consortium of three Brazilian universities (UFRN, UFRJ and UnB) and...
report 2018
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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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Wang, Y. (author)
Autogenic and allogenic forcing interacts at different timescales, and their interaction results in the sequential sedimentary patterns observed in fluvial sediment records (Abels et al., 2013). Field studies help to understand surface processes in the past and interpret the way fluvial architecture is formed. That is crucial for geological...
report 2017
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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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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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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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Anema, J. (author)
As a result of the injection of massive amounts of carbon, the Paleocene-Eocene boundary is characterized by an abrupt rise in global temperature. The Paleocene-Eocene Thermal Maximum (PETM) is coincided with a drastic change in sediments and a negative Carbon Isotope Excursion (CIE). Given the recent issues of global warming, with a changing...
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 Toorenenburg, K.A. (author), Donselaar, M.E. (author), Noordijk, N.A. (author), Weltje, G.J. (author)
Floodplain deposits are abundant in low-gradient dryland river systems, but their contribution to connected reservoir volumes has not yet been fully acknowledged due to their poor detectability with typical wireline log suites and relatively-lower reservoir quality. This study presents an analysis of stacked crevasse splays in the distal part of...
report 2016
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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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Jansz, W.H. (author)
Within the lower Paleocene Tullock Formation that is exposed in northeastern Montana (USA), an alternation of fluvial deposits with lignite coal seams is observed. In these coals different tephras are interbedded. In order to test if the coal seams are lateral continuous features and thus formed by allogenic processes, a tephrostratigraphic...
report 2016
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