Results 141 to 150 of about 208 (182)

The Geophysical Signature Of The Marsfontein Kimberlite Pipe

7th SAGA Biennial Technical Meeting and Exhibition, 2001
The M1 kimberlite pipe is located on the farm Marsfontein near Potgietersrus in the Northern province. With a surface area of roughly 0.5ha, this is by no means an insignificant diamond deposit. Over 1.8 million carats were recovered from the start of the project in 1998 to the end of 2000.
openaire   +1 more source

Degassing structures in volcaniclastic kimberlite: Examples from southern African kimberlite pipes

Journal of Volcanology and Geothermal Research, 2008
Kimberlite pipes are commonly filled with a distinctive structureless facies termed volcaniclastic kimberlite (previously also termed Tuffisitic Kimberlite Breccia, TKB), which constitutes a thorough mix of both juvenile material and lithic clasts derived from all stratigraphic levels.
Gernon, TM, Sparks, RSJ, Field, M
openaire   +2 more sources

KIMBERLITE SILLS AND DYKES ASSOCIATED WITH THE WESSELTON KIMBERLITE PIPE, KIMBERLEY, SOUTH AFRICA

South African Journal of Geology, 2012
Field relations, petrography and bulk rock geochemistry constrain the emplacement mechanisms and petrogenesis of a kimberlite sill complex exposed in water tunnels at Wesselton Mine, Kimberley. The sill complex, together with associated dykes, is precursor to the main Wesselton pipe and contains: 1.
White, Jenny, Sparks, R. S. J., Bailey, K., Barnett, W. P., Field, M., Windsor, L.   +5 more
openaire   +2 more sources

Exploration Geophysics Of Kimberlite: An Assessment Of Methods Applied To The Goedgevonden Kimberlite Pipe

3rd SAGA Biennial Conference and Exhibition, 1993
The primary purpose of this study was to identify geophysical methods that were cheap, quick, readily available for use which would yield an indicative response over a known kimberlite. The following methods were selected for assessment: ground magnetics, self potential, radiometrics, horizontal loop electromagnetic (HLEM), and very low frequency (VLF)
openaire   +1 more source

The geology of the Singida kimberlite pipes, Tanganyika

1962
Fifty-four kimberlite pipes and dykes cut Precambrian granite in the Singida region of Tanganyika. The pipes range from 60 to 2500 feet in diameter, and occur in clusters and lines. The lines follow fracture zones. In addition to intrusive kimberlite, the pipes contain massive to stratified kimberlite tuff and sedimentary-tuffaceous beds.
openaire   +1 more source

XENOLITHS OF HORNBLENDITES FROM THE UDACHNAYA KIMBERLITE PIPE

Russian Geology and Geophysics, 1995
Based on study of structural characteristics of mineralogy and chemistry of hornblendite xenoliths from the Udachnaya Kimberlite Pipe, we have recognized pyroxene, pyroxene-plagioclase, monomineral, and mica varieties. The reaction relationships of amphibole with relict pyroxene suggest metasomatic nature of hornblendites.
A. A. Lunegov, A. I. Kiselev
openaire   +1 more source

Improvements in Search Techniques to Detect Kimberlite Pipes

81st EAGE Conference and Exhibition 2019, 2019
Summary A review is made of traditional methods that have proven popular in aiding exploration for diamonds. Simple pattern recognition technique can be used to locate kimberlite pipes that have a magnetic response. Gravity tensor gradients have also started to be used.
D. FitzGerald, T. Meyer
openaire   +1 more source

Eclogite clinopyroxenes from the kimberlite pipes of Yakutia

Lithos, 1968
The kimberlite pipes of Yakutia contain a number of rare xenoliths of deep seated origin (corundum eclogites, grospydites and diamond bearing eclogites). The chemistry of the clinopyroxenes from each of these rock types is distinctive. The pyroxenes of corundum eclogites and grospydites are aluminium rich, while a high Na 2 O content is characteristic ...
openaire   +1 more source

Serpentinization of Olivine in a Kimberlite Pipe Udachnaya

2023
V. K. Marshintsev, V. G. Gadiyatov, P. I. Kalugin   +2 more
openaire   +1 more source

Kimberlite Pipes

Scientific American, 1978
openaire   +1 more source