Results 71 to 80 of about 2,573 (214)
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
wiley +1 more source
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
doaj +1 more source
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
Geological and Petrographic Characteristics of Kimberlite Pipes
Вестник Пермского университета. Геология, 2016 Studies of the geological structure and petrochemical composition of the Siberian Platform kimberlites indicated complexity, diversity of geological, tectonic, and paleogeographic situations, which must be considered for proper prospecting-exploration for diamonds in each area of investigation.
openaire +3 more sources
Olivine in the Udachnaya-East kimberlite (Yakutia, Russia): types, compositions and origins [PDF]
, 2007 Olivine is the principal mineral of kimberlite magmas, and is the main contributor to the ultramafic composition of kimberlite rocks. Olivine is partly or completely altered in common kimberlites, and thus unavailable for studies of origin and evolution ...
Demouchy, S +7 more
core +3 more sources
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
wiley +1 more source
Noble gases in diamonds: Occurrences of solarlike helium and neon [PDF]
, 1987 We have measured noble gases in 17 diamond samples, mostly inclusion free, from diverse, known locations. The ^3He/^4He ratios are characterized by a large spread (10^4), ranging from values below atmospheric to close to the solar ratio.
Epstein, S. +3 more
core +1 more source
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
wiley +1 more source