Results 121 to 130 of about 526 (172)
Mantle plume trail beneath the ca. 1.1 Ga North American Midcontinent Rift revealed by magnetotelluric data. [PDF]
Natl Sci RevLin W +4 more
europepmc +1 more source
Fossil pollen resolves origin of the South African Proteaceae as transcontinental not transoceanic. [PDF]
Ann BotLamont BB, He T, Cowling RM.
europepmc +1 more source
Some of the next articles are maybe not open access.
Related searches:
Related searches:
Indian kimberlites and the genesis of kimberlites
Chemical Geology, 1984Abstract Late Proterozoic kimberlites occur in both southern and central India. They are similar in petrography and geochemistry to the kimberlites of southern Africa and Yakutia, U.S.S.R. These rocks contain low-CaO forsteritic olivines (Fo92), abundant phlogopites, magnesian ilmenites, aluminous—magnesian chromites, chrome-pyrope garnets surrounded
Eric A.K. Middlemost, Dalim K. Paul
openaire +1 more source
Compositional classification of ?kimberlitic? and ?non-kimberlitic? ilmenite
Lithos, 2004Abstract Ilmenite is one of the common kimberlitic indicator minerals recovered during diamond exploration, and its distinction from non-kimberlitic rock types is important. This is particularly true for regions where these minerals are present in relatively low abundance, and they are the dominant kimberlitic indicator mineral recovered.
Bruce A. Wyatt +3 more
openaire +2 more sources
Kimberlite and kimberlitic intrusives of southeastern Australia
Mineralogical Magazine, 1980SummaryFifteen widely separated occurrences of kimberlite and kimberlitic rocks are now known in south-eastern Australia. Those that have been satisfactorily dated isotopically give ages ranging from Permian to Late Jurassic. One occurrence exhibits an intimate spatial association with carbonatite.
openaire +1 more source
Kimberlitic zircons ? A possible aid in prospecting for kimberlites
Mineralium Deposita, 1975Kimberlitic zircons from 16 intrusions in Lesotho, the Republic of South Africa, and Tanzania have been investigated. The following characteristics distinguish the kimberlitic zircons from the zircons derived from most other sources: 1. Rounded to subrounded grains predominate; euhedral zircons are very rare. 2.
P. Kresten, P. Fels, G. Berggren
openaire +1 more source
What is a Kimberlite? Petrology and Mineralogy of Hypabyssal Kimberlites
Elements, 2019Hypabyssal kimberlites are subvolcanic intrusive rocks crystallised from mantle-derived magmas poor in SiO2 and rich in CO2 and H2O. They are complex, hybrid rocks containing significant amounts of mantle-derived fragments, primarily olivine with rare diamonds, set in a matrix of essentially magmatic origin.
Mitchell, Roger H. +2 more
openaire +3 more sources
Physics and Chemistry of the Earth, 1975
Abstract The model of a kimberlite pipe depicts a hypothetical pipe having a diameter of 300 m at a level equivalent to the post-erosional (present-day) surface of the major pipes in the Kimberley area. Below this reference level the pipe configuration and composition illustrate features typical of the Kimberley occurrences.
openaire +1 more source
Abstract The model of a kimberlite pipe depicts a hypothetical pipe having a diameter of 300 m at a level equivalent to the post-erosional (present-day) surface of the major pipes in the Kimberley area. Below this reference level the pipe configuration and composition illustrate features typical of the Kimberley occurrences.
openaire +1 more source
Mineralogical Magazine, 2013
AbstractA detailed mineralogical examination of representative material from the P2-West 'kimberlite' located in the Wajrakarur Kimberlite Field (India) demonstrates that significant differences exist between these rocks and archetypal hypabyssal kimberlite.
Gurmeet Kaur, R. H. Mitchell
openaire +1 more source
AbstractA detailed mineralogical examination of representative material from the P2-West 'kimberlite' located in the Wajrakarur Kimberlite Field (India) demonstrates that significant differences exist between these rocks and archetypal hypabyssal kimberlite.
Gurmeet Kaur, R. H. Mitchell
openaire +1 more source
Polymineralic inclusions in kimberlite-hosted megacrysts: Implications for kimberlite melt evolution
Lithos, 2019Abstract Megacrysts are large (cm to >20 cm in size) mantle-derived crystals, which are commonly entrained by kimberlite magmas, comprising of olivine, orthopyroxene, clinopyroxene, phlogopite, garnet, ilmenite and zircon as common phases. Numerous studies have shown megacrysts to contain polymineralic inclusions, which have been interpreted to ...
Adam Abersteiner +7 more
openaire +1 more source