SK

188 records found

Quaternary Caspian Sea level variations depended on geophysical processes (affecting the opening and closing of gateways and basin size/shape) and hydro-climatological processes (affecting water balance). Disentangling the drivers of past Caspian Sea level variation, as well as t ...

The NW Amazonian Craton in Guainía and Vaupes departments, Colombia

Transition between orogenic to anorogenic environments during the Paleo-Mesoproterozoic

In order to improve our understanding of the NW-Amazonian Craton evolution, we present new petrographic, geochemical and geochronological analyses of 27 samples from the geotectonic Rio Negro-Juruena Province in eastern Colombia (Guainía and Vaupés departments). New LA-ICP-MS zir ...
Alluvial diamonds have been found in Suriname since the late 19th century, but to date the details of their origin remain unclear. Here we describe diamonds from Paramaka Creek (Nassau Mountains area) in the Marowijne greenstone belt, Guiana Shield, north-eastern Suriname. Thirte ...
The Armina Formation along the Coppename River is a part of the 2.26-2.10 Ga Paleoproterozoic Marowijne Greenstone Belt of Suriname. It is in faulted contact with the 2.08-2.05 Ga Bakhuis Granulite Belt. This paper studies the relation between these units based on field observati ...
The Caspian Sea is an evolutionary island whose rich and endemic fauna have evolved in partial isolation over the past two million years. Baseline studies of pre-20th Century communities are needed in order to assess the severity of the current Caspian biodiversity cri ...

Quaternary time scales for the Pontocaspian domain

Interbasinal connectivity and faunal evolution

The Pontocaspian (Black Sea - Caspian Sea) region has a very dynamic history of basin development and biotic evolution. The region is the remnant of a once vast Paratethys Sea. It contains some of the best Eurasian geological records of tectonic, climatic and paleoenvironmental c ...
Proterozoic metamorphic and igneous rocks belonging to the Guiana Shield form the basement of the Colombian territory from its eastern borders westwards to at least the eastern flanks of the Central Cordillera. A small part of the Amazonian basement underlain by felsic metavolcan ...
The interior of the Guiana region in north‐eastern South America was one of the last mountain areas to be explored in the Americas; the flat and rocky summit of Roraima was ascended for the first time only in 1884. This is one of more than 60 such table mountains, called tepuis b ...

Spiegelzee

De zeespiegelgeschiedenis van de mens

Wie zich zorgen maakt over een stijgende zeespiegel, zo schrijft Salomon Kroonenberg in 'Spiegelzee', vergeet dat de mensheid zoiets al eerder heeft meegemaakt. Zo'n 120.000 jaar geleden stond de zeespiegel zes meter hoger dan nu, en lag Amersfoort aan zee. In het koudste deel va ...
Salomon Kroonenberg duikt in de ‘Surinaamse erfenis’ van professor Jan Pieter Bakker, de grote man van de Amsterdamse fysisch geografen in de jaren
1940-60. Omdat Bakker veel bevindingen publiceerde in congresbundels en gedenkboeken van collega’s in Duitsland, Frankrijk en Oo ...
The sedimentological, metamorphic, petrographic and geochemical characteristics of the Armina Formation, part of the Paleoproterozoic Greenstone Belt of Suriname in South America, are described, based on field, geochemical and petrographic evidence obtained through fieldwork alon ...
The Proterozoic basement of Suriname consists of a greenstone–tonalite–trondhjemite–granodiorite belt in the northeast of the country, two highgrade belts in the northwest and southwest, respectively, and a large granitoid–felsic volcanic terrain in the central part of the countr ...

Gold deposits of Suriname

Geological context, production and economic significance

Gold has been a major economic asset for Suriname for more than a century. The long history of gold mining, concentrated in large parts of a greenstone belt in the northeast of the country, began with small-scale artisanal extraction activities and has recently seen the developme ...
This special issue of the Netherlands Journal of Geosciences / Geologie en Mijnbouw contains the proceedings of the Conference on the Economic Geology of Suriname, held on 16 January 2015 in The Hague, the Netherlands, to honour Dr Eddie Jharap (Fig. 1), founder and former Chief ...
This article is based on long-term research of aquatic landscapes in the Volga River delta which was held in 2010–2012 and included investigation and sampling of bottom sediments in deltaic lagoons, fresh-water bays, small channels, oxbow lakes, and part of the deltaic near-shore ...