2013年12月4日 · Dolerite’s sills and dykes created the Karoo’s distinctive flat-topped hills and dramatic landscapes. Dolerite created some of the rock that Stone Age people used for tools. Dark dolerite boulders helped provide the canvas for human artistic endeavour and evolution.

2011年4月11日 · Here we discuss the evolutionary history of dolerite sills and dykes in different parts of the basin on the basis of new major and trace element analyses of dolerite samples collected from drill-cores (five sites spanning 1700 m of basin stratigraphy) and previously published data on sills and dykes in the Golden Valley Sill Complex (GVSC).

2017年4月1日 · This paper describes the spatial and temporal relationships between Karoo-age (ca. 180 Ma) dolerite dykes and a regional-scale saucer-sill complex from the Secunda (coal mine) Complex in the northeastern parts of the Karoo Basin of South Africa.

The Karoo dolerite sills and ring-complexes have the same geographical distribution as the dolerite dykes and they are by far the most common type of intrusion in the Karoo basin. The dolerite sills and dykes form a complex intrusive network that probably acted as …

2023年1月1日 · The igneous intrusions of the Karoo Large Igneous Province (LIP) provide critical information on the magma plumbing system, which served as source rock maturation agent for organic-rich sedimentary rocks of the Main Karoo Basin as well as pathway and barrier to subsurface fluid flow.

2011年4月19日 · Here we discuss the evolutionary history of dolerite sills and dykes in different parts of the basin on the basis of new major and trace element analyses of dolerite samples collected from...

This study shows that aeromagnetic surveys provide valuable complementary data for mapping the shape, size, depth and geometry of magnetic Karoo dolerites, thereby contributing evidence of the tectonic history in the Karoo basin

2000年10月1日 · New age, trace element and isotope data for this dyke swarm show that is magmatism is indistinguishable from Karoo continental flood basalts. Ar/Ar dating gives an age of 178.9 ± 1.4 Ma. Both high Ti-Zr and low Ti-Zr dolerites occur, but the high Ti-Zr rocks appear to be the dominant type of magmatism.

2005年3月30日 · A suite of dolerite dykes from the Ahlmannryggen region of western Dronning Maud Land (Antarctica) forms part of the much more extensive Karoo igneous province of southern Africa. The dyke compositions include both low- and high-Ti magma types, including picrites and ferropicrites.

The Karoo Large Igneous Province (KLIP) in South Africa comprises a spatially limited basalt suite (Drakensberg Group) and a spatially extensive dolerite suite. This study aims to establish a tectonic regime that could have facilitated the KLIP and the extent of geochemical variation in the dolerite suite. Principal component analysis