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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 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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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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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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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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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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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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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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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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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
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Rost, E. (author)
The Paleocene Tullock formation, located in the North American Western Interior Basin, contains widely distributed coal layer deposits which display various cyclic patterns. The formation of the cyclicity is generally attributed to regional to local tectonic variation processes. However, there are several examples of sediment deposits that are...
report 2014
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Keijzer, F. (author)
This is a study based on determining the stable isotope composition of fluid inclusions of cold- and warm-water corals from the Bahamas and Curaçao respectively. Geochemical data were obtained using a new online technique called the ‘Amsterdam Device’ which comprises δ2H and δ18O analyses of fluid inclusions with a continuous-flow crushing...
report 2014
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Nanne, J.A.M. (author)
The Bakhuis Granulite Belt (BGB) in the largest Proterozoic granulite-facies domain in northern South America. A metapelite area of 50-100 km2 in the NE of the belt shows orthopyroxene + sillimanite + quartz ± sapphirine with 8-10wt% Al2O3 in the orthopyroxene, characteristic for ultrahigh-temperature (UHT) metamorphism. Evidence for UHT...
report 2013
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Ye, Q. (author), Taheri, M. (author), Van Geenhuizen, M.S. (author)
Open innovation is well conceptualized and researched for large established firms, but not for small and young ones. What makes small high-technology firms more open in search behaviour and innovation and others more closed, has remained largely unknown. This particularly holds true for university spin-off firms. The paper fills this gap and...
conference paper 2012
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Bliekendaal, Erik (author)
A extensive overview of the literature discussion on magma chamber evolution is presented. There are two end-member models, the large magma chamber and the incremental pluton growth. This author considers both models for valid and concludes that only detailed study of a pluton can reveal to what extent which model is most plausible. From field...
report 2012
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van Wetten, I.A. (author)
Cyclic sedimentation caused by orbital forcing has been studied intensively within the marine domain. Within the terrestrial domain however, cycles are less evident which make it less clear whether deposition is orbital forced, but there are indications that this is also the case in the terrestrial domain. In the Purgatory Hill area, north...
report 2012
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Klaver, Martijn (author)
The Bakhuis granulite belt (western Suriname) consists of an early Proterozoic high-grade supracrustal sequence characterised by ubiquitous compositional banding. Orthopyroxene is invariably present in both the mafic and dominant quartzofeldspathic lithologies. Locally, the Bakhuis belt has experienced ultrahigh-temperature metamorphic...
report 2011
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Koerten, H. (author)
Implementation processes of geoinformation-infrastructures are generally seen as problematic and unsuccessful. Implementers are inclined to value organisational aspects of NGII development using design rules, borrowed from political science, economics and management science. A big gap exists between on the one hand the wish to implement SDIs...
conference paper 2010
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