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Перевод: zircon

[существительное]
циркон

Тезаурус:

1. There is no accepted blocking temperature for Pb retention in zircon, however, nor any evidence that it lies below the equilibration temperatures of upper-mantle rocks.
2. Similarly high U contents (although with less Th) have been found in a small zircon inclusion in a Zaire diamond.
3. On this basis, we reinterpret the young ages derived from most zircon megacrysts in kimberlites and related rocks as implying a close genetic relationship between the megacryst suites and their host eruptives.
4. Ramtron use a ceramic called PZT, which consists mainly of lead, zircon and titanium oxides, with traces of other elements.
5. Three zircons were dated in situ using the SHRIMP ion microprobe at the Australian National University in Canberra, after chips of the ANU zircon standard SL13 had been implanted into the analysed thin section.
6. The presence of zircon crystals up to 0.25mm in size in the veins (Fig. 1) is reflected in the unusually high Zr content of the bulk rock (340p.p.m.).
7. Indeed, there is evidence that old U-Pb ages are preserved in zircon megacrysts and in zircon inclusions in diamond, both erupted in young kimberlites.
8. Their willingness to grant ex-parte and interlocutory injunctions has meant that liberties are sometimes extinguished without proper adjudication, and on other occasions that their vindication has been crucially delayed (see the Zircon affair and the Spycatcher litigation in Chapter 5).
9. The thermal history of the South Mountains Granodiorite, provided by isotopic (U-Pb zircon, 40 Ar/ 39 Ar hornblende, K-Ar biotite) and fission-track (apatite) age determinations, indicates rapid cooling of 260CMyr -1 (from 800 to 300C) between 22 and 20Myr ago, followed by slower cooling of 73CMyr -1 (from 300 to 100C) between 20 and 17Myr (ref. 24).
10. These veins contain diopside and phlogopite, with minor disseminated ilmenite, zircon, calcite, apatite and serpentine.
11. Zircon is rare in mantle rocks (all known occurrences in kimberlite are of xenocrystic or xenolithic origin) but does occur in MARID xenoliths.
12. There was also a strange security operation against a journalist following disclosures about espionage devices ("Zircon") in the New Statesman .