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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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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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Thijssen, A.C.D. (author)The Bakhuis Granulite Belt (BGB) is a PaleoProterozoic granulite facies domain in west Suriname, South America. Mineral assemblages such as sapphirine + quartz and orthopyroxene + sillimanite + quartz indicate that the belt experienced Ultrahigh-Temperature (UHT) metamorphism, which was dated at 2,07 – 2.05 Ga (De Roever et al., 2003a). In the...report 2016
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- Kollaard, R. (author) 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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Kaskes, P. (author)In August 2013, Naturalis Biodiversity Center in Leiden and the Black Hills Institute (Hill City, USA) excavated a new specimen of Tyrannosaurus rex on the Murray Ranch, south of Jordan, eastern Montana, USA. The partial skeleton of this famous carnivorous dinosaur was found in a fluvial sandstone deposit of the Upper Maastrichtian Hell Creek...report 2016
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van der Veer, E.C. (author)The Huesca fluvial fan contains a low gradient fluvial system with well-exposed, 3D outcrops. An outcrop study of low-sinuous deposits aims to provide a deterministic reservoir model that predicts correlation lengths, nesting and reservoir potential of thin-bedded fluvial reservoir sandstone in an overall low net-to-gross setting. To correlate...report 2016
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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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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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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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van den Heuvel, Q. (author)Plate tectonics are controlled by Earth’s mantle. Large scale tectonic processes in the mantle are thought to be recorded in the deep carbon cycle. Diamonds consist for 99% of carbon and therefore provide an excellent paleo-carbon mantle record. By linking the information derived from diamonds and their inclusions to xenoliths it can possibly...report 2016
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Vos, H. (author)The Bakhuis Granulite Belt consists mainly of intermediate and mafic granulites that show banding on decimetre scale. Intercalations of Al-silicate-rich granulite and of quartzite are of a clear sedimentary origin and may indicate that the granulites are also of sedimentary origin. However, the granulites might also originate from volcanic...report 2015
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Klaver, M. (author), de Roever, E.W.F. (author), Nanne, J.A.M. (author), Mason, P.R.D. (author), Davies, G.R. (author)The Bakhuis Granulite Belt in western Suriname is an ultrahigh-temperature (UHT) metamorphic terrain in the centre of the Paleoproterozoic (Transamazonian) Guiana Shield. Next to the UHT granulites, the belt contains a 30 by 30 km body of orthopyroxene-bearing granitoids: the Kabalebo charnockites. This setting offers an excellent opportunity to...report 2015
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Huijgen, M. (author)The Kunlun Orogen is situated at the northern edge of the Tibetan Plateau in Qinghai, China. The focus of this study are the East Kunlun mountains, separated from the West Kunlun Mountains by the large sinistral Altyn Tagh fault. The East Kunlun Mountains are separated in three zones (the Southern Zone, Central Zone and Northern Zone) separated...report 2015
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Sakes, A. (author)The formation of the Lesser Antilles volcanic island arc, of which Saba forms the northernmost volcanic edifice, is caused by subduction of the Atlantic Oceanic crust underneath Caribbean Oceanic crust. Several scientists demonstrated the importance of magma mixing and, in a lesser degree, assimilation in the magma chambers underneath Saba. The...report 2015
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Uunk, B. (author)Within the Guiana shield, the Bakhuis belt forms a ~30 x 100 km horst-shaped geologic anomaly of UHT granulites and plutonic rocks oblique to the older TTG-greenstone in the north and the younger arc-related CSID-belt to the south. Consequently, the belt has the potential to provide important information on the history of the Guiana shield. The...report 2015
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Zomerdijk, M. (author)The volcanic island of Saba is located in the Caribbean Sea and is part of the Lesser Antilles volcanic arc. The andesitic domes of Saba preserve a lot of andesitic host rocks as well as basaltic enclaves. In this project the geochemical signatures of Li, Be and Cl are studied to identify the source of the basalts and andesitic rocks. ⁸⁷Sr/⁸⁶Sr...report 2015
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Bosdom, K. (author), van der Ven, M. (author), van der Velde, R. (author), Bertotti, G. (author): In earlier stages of this project, we have characterized natural fracture patterns and fluid flow in outcropping Lower-Cretaceous carbonate pavements of the Jandaira Fm. in the Potiguar Basin, NE Brazil. We found that most fractures are formed during early burial, resulting mainly from NNE-SSW compression and partially from more recent NW-SE...report 2015
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Arens, T. (author)Saba is a volcanic island and is part of the Lesser Antilles island arc, which is related to the ongoing subduction of the Atlantic oceanic plate underneath the Caribbean plate. This arc has been studied extensively because of the recent volcanism. Also, there is a north to south gradient in chemical and isotopic composition of the lavas. This...report 2015
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Bontje, C.J.C. (author)The Kunlun Mountains, located along the northern margin of the Tibetan Plateau in Qinghai, Western China play an important role in the collision history between Eurasia and India. However, not much research has been done on both metamorphic P-T conditions and geochronology. A combined P-T modelling and 40Ar/39Ar dating study on the Jinshuikou...report 2015