Results 71 to 80 of about 657 (209)
Specific features of kimberlites of Mirny field (Sibirian platform)
Известия высших учебных заведений: Геология и разведка, 2019 Results of comparative complex investigation are provided for diamonds from primary bodies of Mirny kimberlite field, among which three groups are distinguished sharply differing by typomorphic features of crystals, related with three separated in time ...
N. N. Zinchuk, V. I. Koptil
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Earth and Space Science, Volume 11, Issue 11, November 2024.Abstract The Charity Shoal structure is a circular, ∼1.2‐km‐diameter, bedrock‐rimmed shoal in eastern Lake Ontario with a ∼20‐m‐deep central basin. The structure has been proposed as a possible Middle Ordovician impact crater or volcanic intrusion. We conducted marine seismic and magnetic surveys (9‐km2) and 3‐D geophysical modeling to better resolve ...
Mary H. Armour +3 more
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Rare earth element characteristics of pyrope garnets from the Kaavi-Kuopio kimberlites - implications for mantle metasomatism [PDF]
Bulletin of the Geological Society of Finland, 2005 Peridotitic garnet xenocrysts from five kimberlite pipes in the Kaavi-Kuopio area of eastern Finland have been studied using major and trace element geochemistry to obtain information on the stratigraphy, compositional variability and evolutionary ...
M. Lehtonen
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Magnetic surface geometry inversion of Kimberlites in Botswana
Geophysical Prospecting, Volume 72, Issue 9, Page 3524-3546, November 2024.Abstract Surface geometry inversion of geophysical data has recently been introduced as an effective approach for generating surface‐based geological models. The models obtained through surface geometry inversion clearly delineate the contacts between distinct rock units, making them easily interpretable by geologists.
Saeed Vatankhah +3 more
wiley +1 more source
, 2013 Kimberlite magmas are volatile-rich, silica-poor ultrabasic magmas originating as small-degree mantle melts at depths of 150 km or greater. Alteration and entrained xenoliths obscure their original magma chemistry and properties.
Sparks, R. S. J.
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Геодинамика и тектонофизика, 2015 This article provides basic information about Mikhail M. Odintsov (1911–2011), Corresponding Member of the USSR Academy of Sciences, and his scientific, organizational and social activities.
Dmitry P. Gladkochub +2 more
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LITHOLOGY OF KIMBERLITE PIPE ORFICE OF CAMACHIA
Collection of Scientific Works of the Institute of Geological Sciences of the NAS of Ukraine, 2014 Впервые алмазы были открыты в Анголе в 1912 г.. В последующие 40 лет добыча алмазов велась из аллювиальных отложений. К настоящему времени в стране выявлено около 700 кимберлитовых месторождений. Кимберлитовой трубки Камачия введена в эксплуатацию в 2005 году.
openaire +3 more sources
Journal of Raman Spectroscopy, Volume 55, Issue 10, Page 1090-1104, October 2024.Olivine‐hosted secondary melt inclusions in xenoliths from five Kaapvaal craton kimberlites of variable diamond grade do not show difference in composition. The composition of 26 minerals identified in the daughter phases suggests carbonate melt rich in alkali, sulfur, chlorine, and phosphorus infiltrated the kimberlite xenoliths.
Sahroz Khan +3 more
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When a Plateau Suppresses a Plume: Disappearance of the Samoan Plume Under the Ontong Java Plateau
AGU Advances, Volume 5, Issue 4, August 2024.Abstract The Samoan hotspot generated an age‐progressive volcanic track that can be traced back to 24 Ma at Alexa Bank, but the trace of the older portion (>24 Ma) of the hotspot track is unclear. We show that six seamounts located in and around the Magellan Seamount chain—north of the Ontong‐Java Plateau (OJP)—have ages (87–106 Ma), geochemistry, and ...
M. G. Jackson +3 more
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Crater formation and erosional truncation of Arkhangelskaya kimberlite pipe (Russia)
Известия высших учебных заведений: Геология и разведка, 2019 The Late Devonian kimberlite pipes Arkhangelskaya, Pionerskaya, named after Grib, as well as a number of other pipes, have full sections of crater tufogenic and terrigenous deposits in the Zimneberezhny diamondiferous region, the thickness of which is ...
A. V. Bolonin +2 more
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