scholarly journals Use of indicator minerals in diamond exploration: a comparison between barren and fertile kimberlites in Angola

2019 ◽  
Keyword(s):  
Diamond Exploration ◽  
Indicator Minerals

Kimberlites and other ultramafic alkaline rocks in the Sisimiut–Kangerlussuaq region, southern West Greenland

2002 ◽  
pp. 57-66 ◽  
Author(s):  
Sven Monrad Jensen ◽  
Henriette Hansen ◽  
Karsten Secher ◽  
Agnete Steenfelt ◽  
Frands Schjøth ◽  
...  
Keyword(s):  
Great Length ◽  
Carbonatite Complex ◽  
Original Series ◽  
West Greenland ◽  
Alkaline Rocks ◽  
Diamond Exploration ◽  
Rock Types ◽  
Indicator Minerals

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, e.g.: Monrad Jensen, S., Hansen, H., Secher, K., Steenfelt, A., Schjøth, F., & Rasmussen, T. M. (1). Kimberlites and other ultramafic alkaline rocks in the Sisimiut–Kangerlussuaq region, southern West Greenland. Geology of Greenland Survey Bulletin, 191, 57-66. https://doi.org/10.34194/ggub.v191.5129 The alkaline province of southern West Greenland includes swarms of dykes described as kimberlites and lamproites (Larsen 1991), and these rock types are widely distributed in the Sisimiut–Sarfartoq–Kangerlussuaq region (Figs 1, 2). Kimberlites and lamproites are potential carriers of diamond, and since the description of the Sarfartoq carbonatite complex and the kimberlitic dykes related to this complex (Larsen 1980; Secher & Larsen 1980), the Sisimiut–Sarfartoq–Kangerlussuaq region has seen several campaigns of commercial diamond exploration. The latest and most persistent stage of exploration began in the mid-1990s and has continued to date, with varying intensity. Numerous reports of diamond-favourable indicator minerals from till sampling, finds of kimberlitic dykes, and recovery of actual diamonds from kimberlitic rocks have emerged since 1995 (Olsen et al. 1999). A drilling programme in late 2001 confirmed the unusually great length and width of a magnetic kimberlitic dyke (Ferguson 2001).

Ultrabasic eruptives with alnöitic-kimberlitic affinities from Malaita, Solomon Islands

1965 ◽  
Vol 34 (268) ◽  
pp. 16-34 ◽  
Author(s):  
J. B. Allen ◽  
T. Deans
Keyword(s):  
Solomon Islands ◽  
Chemical Analyses ◽  
Alkaline Rocks ◽  
Kimberlite Indicator Minerals ◽  
Host Rocks ◽  
Indicator Minerals

SummaryA detrital assemblage of magnesian ilmenite, pyrope, chrome-diopside, rutile, and zircon has been traced to outcropping ultrabasic alkaline rocks, hitherto unknown in the Melanesian region. Analyses and descriptions of these ‘kimberlite indicator minerals’ are given. The host rocks comprise alnöite, an alnöite breccia with calcite matrix, and a magnesian ankaratrite, which are described, with chemical analyses. Emphasis is laid on the abundance of ultrabasic inclusions and xenocrysts and the replacements and transformations they have undergone. Malaita Island promises to contribute significantly to the understanding of the relations between alnöite, melilite basalts, and kimberlites.

Use and misuse of Mg- and Mn-rich ilmenite in diamond exploration: A petrographic and trace element approach

Lithos ◽  
2017 ◽  
Vol 292-293 ◽  
pp. 348-363 ◽  
Author(s):  
Montgarri Castillo-Oliver ◽  
Joan Carles Melgarejo ◽  
Salvador Galí ◽  
Vladimir Pervov ◽  
Antonio Olimpio Gonçalves ◽  
...  
Keyword(s):  
Trace Element ◽  
Diamond Exploration ◽  
Element Approach
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