Diatremes


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Diatremes

 

(volcanic pipes), volcanic vents in the shape of vertical pipes widening toward the top to form a funnel. Diatremes result from major gas eruptions. They are common in the vicinity of Kimberley (South Africa), where they have been filled with a volcanic breccia-like rock (kimberlite) containing diamonds. In the last decade diamond-bearing kimberlite volcanic pipes have been discovered in the Yakut ASSR.

References in periodicals archive ?
This diamondiferous kimberlite will be the first diatreme to be extensively explored over the coming months as was detailed in the announcement May 10, 2004.
Additional surface sampling together with alluvial testing is proposed to determine the extent and mineral content of these newly discovered diatremes.
In Tantar, the diatremes are comprised of breccias with fragments of chalcedon and opal within a matrix of steam-heated silica and rocks with advanced argillic alteration.
The authors are both qualified persons by NI43-101 definition, and are familiar with exploration for and experienced in discovery of diamond bearing kimberlite diatremes in the Northwest Territory.
The authors are both qualified persons by NI43-101 definition, and are familiar with exploration and experienced in discovery of diamond bearing kimberlite diatremes in the Northwest Territory.
Such fractures are often the preferred location of diatremes that rise from the deeper parts of the mantle, including the kimberlites that come from depths of around 200 kms where diamonds are a naturally stable form of carbon.
As Jilbey is targeting diatreme bodies in their exploration, and since there is a known association of high grade gold mineralization with some diatremes on Gold Canyon's properties, the Company is optimistic that other diatreme-related gold mineralization may be found as a result of Jilbey's exploration efforts.
This model is conceptually focussed on active subduction in which diamondiferous material is captured by rapidly rising alkalic magmas that cut through the subducted slab to form diatremes at surface.
Three large positive magnetic anomalies of 40-50 acres each were interpreted as diatremes.
A number of lake hosted horizontal conductors indicative of possible kimberlitic diatremes (diamonds) were prioritized for drilling which, hopefully, can commence while lake-ice is still thick enough to support vertical drilling operations.
Ground geophysical and geological surveys commencing this month will help prioritize drilling targets on numerous anomalies indicated by last year's detailed helicopter-EM/Magnetic survey to be possible massive sulfide (Ni-Cu-Co) and lake-hosted kimberlitic diatremes (diamonds).
The 28,830 hectare Balairiam Property is located within Central Kalimantan at the southwestern end of the main northeast trending Trans Borneo Gold Belt hosting the Busang and Kelian gold mineralized diatremes.