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PETROLOGY OF KIMBERLITES AND LAMPROITES Kimberlites.-The term kimberlite was first used by Lewis (1887) to describe the host rock of diamond at the type locality, Kimber-ley, South Africa. Kimberlite has been the subject of many subsequent investigations, and considerable effort has been expended in finding an adequate …noun an intrusive igneous rock generated at great depth in the earth's mantle and consisting largely of olivine and phlogopite. It often contains diamonds Collins English Dictionary. Copyright © HarperCollins Publishers Word origin C19: from Kimberley + -ite1 Word Frequency kimberlite in American English (ˈkɪmbərˌlaɪt ) nounKimberlite is an igneous rock, not a mineral or crystal, famous for containing small amounts of Diamonds, Olivine, Garnet, Ilmenite, Zircon, Spinel, and other precious stones. The presence of other stones in Kimberlite often gives it a mottled or spotted appearance.By comparison, three compositionally and texturally distinct groups of Ti-bearing andradites from LN42 hypabyssal kimberlites separately define three well-fitted regression lines with lower ...Jul 26, 2023 · Kimberlite eruptions start near the cratonic roots, at least 75 miles underground, and race upward at tens of feet per second — a fiery fury driven by an abundance of carbon dioxide and water. Kimberlite, an ultramafic volcanic rock, ... Generally, pegmatite is defined as a rock bearing abundant interlocking crystals at least 3 centimeters long. Most pegmatite bodies consist largely of quartz and feldspar and are associated with granitic rocks.Kimberlite eruptions leave behind a characteristic deep, carrot-shaped "pipe" of kimberlite rock, which often contains diamonds. Hundreds of these eruptions that occurred over the past 200 million years have been discovered around the world. Most of them were found in Canada (178 eruptions), South Africa (158), Angola (71) and Brazil (70)May 8, 2023 · Abstract. Most diamonds have been transported to Earth’s surface from depths between ~120 km and ~660 km by volatile-rich magmas called kimberlites. The reconstructed locations of kimberlites ... Kimberlite is a type of igneous rock that is ultramafic and ultrapotassic. Its mineral content usually includes olivine, phlogopite, pyroxene, and garnet, accompanied by a variety of trace minerals. Kimberlite occurs in the Earth 's crust in vertical structures known as kimberlite pipes. These pipes are the most important source of mined ...May 31, 2021 · The Nd and Hf isotopic growth trajectories of the primitive kimberlites require derivation from one or more isolated, chemically homogeneous sources that maintained relatively constant and chondritic to slightly suprachondritic Sm/Nd and Lu/Hf ratios for at least the ∼2,000-Ma range of sample ages that define the trend and likely extending ... After mining, nearly all of the kimberlite from each pipe is stockpiled for several months in two areas located several hundred meters from mining operations. The weathering of the kimberlite, especially over winter, softens the material, making it much easier to liberate diamonds and reducing the risk of breaking or damaging larger crystals.Define Kimberlite. Kimberlite is one of the important type of rocks. If we have to define Kimberlite in general, Kimberlite is a rare, blue-tinged, coarse-grained intrusive igneous …The research described in this paper provides information about the rockbursting potential of kimberlite. Kimberlite is a diamond-bearing rock found in deposits around the world including northern Canada. This paper outlines three methods for the prediction of rockbursts based on the properties of a rock. The methods include the: …Kimberlite is an igneous rock and a rare variant of peridotite. It is most commonly known to be the main host matrix for diamonds. It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.70 g) diamond called the Star of South Africa in 1869 spawned a diamond rush … See more(The kimberlite definition ratio is defined as the percentage of kimberlites within the corridor divided by the percentage of ground occupied by the corridor.) The 035°-trend has no significant Archaean representation and few major aeromagnetic linears either on or off the craton.Kimberlites, small-volume volcanic rocks that are the source of most diamonds, offer rare insights into aspects of the composition of the Earth’s deep mantle. …Kimberlite is an igneous rock that major source of diamonds. Kimberlite is a variety of peridotite . It is rich in mica minerals content and often in form of crystals of phlogopite. Other containt abundant minerals are chrome-diopside, olivine, and chromium- and pyrope-rich garnet .Apr 28, 2022 · Kimberlite is an indicator mineral, increasing odds for geologists that a volcanic pipe includes diamonds: not all pipes erupt diamonds with kimberlite. Kimberlite can be considered a 'neighbor ... noun an intrusive igneous rock generated at great depth in the earth's mantle and consisting largely of olivine and phlogopite. It often contains diamonds Collins English Dictionary. Copyright © HarperCollins Publishers Word origin C19: from Kimberley + -ite1 Word Frequency kimberlite in American English (ˈkɪmbərˌlaɪt ) nounKimberlite is an igneous rock and a rare variant of peridotite. It is most commonly known to be the main host matrix for diamonds.The definition of kimberlite in the dictionary is an intrusive igneous rock generated at great depth in the earth's mantle and consisting largely of olivine and phlogopite. It often contains diamonds.INTRODUCTION. Kimberlite, as illustrated in Figs 1 and 2, is a rock dominated by olivine.Most kimberlites are highly altered and their primary textures are poorly preserved, but rare examples, such as the sample from the Kangamiut region of Greenland shown in Fig. 1, contain about 50% of large fresh olivine grains, which are set …Define kimberlite. means a volatile-rich, potassOct 16, 2015 · Kimberlite is an ultramafic rock derived from the m kimberlite A brecciated (see BRECCIA), potassic, ultrabasic igneous rock, consisting of megacrysts of olivine, enstatite, Cr-rich diopside, phlogopite, pyropealmandine garnet, and Mg-rich ilmenite, in a fine-grained groundmass of serpentine, phlogopite, carbonates, perovskite, and chlorite, in varying proportions. Kimberlite chemical composition. Kimberlite Whole rock major- and trace-element geochemistry on kimberlite samples can be used to define and classify different eruptive phases within a single kimberlite body. The application of log-ratio transforms eliminates statistical difficulties that result from data that sum to a constant (e.g. 100%).Kimberlite, a dark-coloured, heavy, often altered and brecciated (fragmented), intrusive igneous rock that contains diamonds in its rock matrix. It has a porphyritic texture, with large, often rounded crystals (phenocrysts) surrounded by a fine-grained matrix (groundmass). It is a mica peridotite, Search BritannicaClick here to search kimberlite A brecciated (see BRECCIA), potassic, ultrabasic igneous

Definition of kimberlite in the Medical Dictionary by The Free Dictionary Sep 1, 2020 · Kimberlite and carbonatite magmatism occurred on continental shields worldwide, and although some Archean and Paleoproterozoic examples are known from the geologic record (Bizzarro et al., 2002; Donnelly et al., 2012), age distributions suggest that this type of mantle melting was more common after 1.2 Ga and particularly frequent during the ... ML006 inversion results – recovered density model. They viewed and imaged the results in 3D along with the high-resolution satellite imagery and physiographic vector data, allowing them to optimize the drilling program both for ice-based vertical holes designed to test the root of the kimberlite and for angled holes from land.Our samples derive from hypabyssal kimberlite dykes from four pipes (A154N, A154S, A418, A21) at Diavik Diamond Mine (DDM), N.W.T, Canada (Brett et al., 2009, Moss et al., 2009) and from the Quaternary Igwisi Hills kimberlite volcanoes (IHV) in Tanzania (Reid et al., 1975, Dawson, 1994, Brown et al., 2012, Jones et al., …Abstract. Mantle metasomatism is a relatively recent concept introduced in the early 1970s when detailed studies of lithospheric mantle rock fragments (xenoliths), brought to the surface of in basaltic to kimberlitic magmas, became widespread. Two main types of metasomatism were defined: modal (or patent) metasomatism describes the introduction ...

8. Kudos. 84. Bookmarks. Diamonds are almost impossible to detect directly because they are so rare: very rich kimberlite pipes, the routes through which diamonds rise, may contain only three carats of diamonds per ton of kimberlite. Kimberlite begins as magma in Earth’s mantle (the layer between the crust and the core).Late Neoproterozoic kimberlite diatremes at Kuopio in eastern Finland are dated to 620-585 Ma (Dalton et al., 2020; O'Brien, 2015). Erosion has removed kimberlite crater facies and comparisons ...8. Kudos. 84. Bookmarks. Diamonds are almost impossible to detect directly because they are so rare: very rich kimberlite pipes, the routes through which diamonds rise, may contain only three carats of diamonds per ton of kimberlite. Kimberlite begins as magma in Earth’s mantle (the layer between the crust and the core).…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Kimberlite is an igneous rock that major source of diam. Possible cause: Jun 23, 2016 · The central Lac de Gras (LDG) kimberlite field, which contain.