Information om | Engelska ordet ZIRCONS

Exempel på hur man kan använda ZIRCONS i en mening

• Hadean rocks are very rare, largely consisting of granular zircons from one locality (Jack Hills) in Western Australia.
• There are xenoliths, mostly granites coming from the Precambrian basement, and zircons recovered from the rocks are up to several billion years old.
• With granitic rock masses and adjoining metamorphic rocks including gneiss, with hornblende, some epidote, some ruby, and garnet, zircons were also found.
• Relict Hadean zircons (xenocrysts) in the Iwokrama Formation suggest that older crust must occur at depth.
• Indirect evidence of an Archaean ancestry for the Bangweulu Block is provided by detrital zircons within the Mporokoso Group, which indicate a local source area with zircons of 3.
• 8 billion years, some of the zircons collected from the orthogneisses of Mount Sones are among the oldest rock specimens found on Earth.
• As the result of a detailed mapping and U–Pb dating, the oldest zircons of the Acasta Gneiss Complex were found to occur within a relatively homogeneous and mappable tonalitic gneiss by J.
• Detrital zircons with ages greater than 4 billion years old have been found in these rocks, and a 4,404 ± 8 million year old zircon was found at Erawandoo Hill; this is the oldest dated material originating on Earth; the date is in the Cryptic era of the Hadean eon.
• Jargoon or jargon (occasionally in old writings jargounce and jacounce) is a name applied by gemologists to those zircons which are fine enough to be cut as gemstones, but are not of the red color which characterizes the hyacinth or jacinth.
• Analyses of zircons from a felsic orthogneiss with presumed granitic protolith returned an age of 4.
• Zircons from this granite protolith shows similarities to zircons from the Yilgarn Craton in Western Australia, and may be evidence for continental crust forming in the Hadean Eon.
• This pluton emplaced at 304 ± 1 Ma (U-Pb dating on zircons), along a thrust surface separating a pile of allochthonous tectonic units from the Foreland.
• Shock metamorphosed zircons with correlated U-Pb discordance and melt rocks with concordant protolith ages indicate an impact origin for the Sudbury Structure.
• " Jeff Simon in his review for The Buffalo News observed, "It isn't that Redman's Elastic Band couldn't figure out freer and merrier ways to groove its way into future hip-hop samples (exploration is not exactly a bugaboo with them), it's just that at the moment, a motherlode of instrumental talent seems to be going into rhinestones and zircons.
• Other minerals identified - which are found in all sandstones across the entire Clarens Formation - are zircons, garnets, agates, riebeckite, spinel, sphene, and hornblende.
• Today Wellingrove has a church, Rural Fire Service (RFS) and a community hall in a Crown Land fossicking area where sapphires and zircons may be found.
• 4 billion year old Antarctic-margin detrital zircons match those in Laurentian granites of similar age; and a glacial clast of A-type granite has a uranium-lead zircon age of 1440 million years, an epsilon-hafnium initial value of +7, and an epsilon-neodymium initial value of +4.
• Potentially, titanium-in-zircon thermometry of Earth's oldest zircons can show the progressive heat loss from a magmatic Hadean Earth to the onset of plate tectonics as the planet's crust began to cool and underwent plastic deformation.
• The designers used gemstones such as zircons, chrysoberyls, tourmalines, opals, garnets, beryls, spinels, and peridots.
• The non-impact seismites studied were the Caledonian deformation zone in SW Norway (also known as the Svarthumlevatnet metagabbro), where non-impact exterior planar microstructures in zircons had been previously found, and the Alpine seismite in northern Italy at Premosello along the Insubric line in the Ivrea–Verbano zone, where non-impact interior planar fractures had been previously found.

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