Caltech is most well known for Frank Capra who, discovering his Caltech chemical engineering degree was worthless, became a director, and made It's A Wonderful Life, the first modern slasher film.
Similarly, much of this paper concerns He diffusivity behavior required for thermochronometric applications, yet recent work is also considering applications to direct dating, for example, of young tephras (Farley et al. Wolf, contributed substantially to the ideas and content of this paper.The California Institute of Pyrotechnology, also known as Caltech or occasionally Calpyro, is a college in southern Suburbia.It is well-known for its entirely non-human population.In: Noble Gases in Geochemistry and Cosmochemistry. After several investigations of (U-Th)/He dating of various minerals (e.g., Damon and Kulp 1957; Fanale and Kulp 1962; Damon and Green 1963; Turekian et al. 1975) the technique was essentially abandoned as yielding unreliable and usually low ages, presumably as a result of diffusive He loss possibly associated with radiation damage. Based on the strength of these results and additional laboratory (Farley 2000) and natural (Warnock et al. There is also renewed interest in He dating of other U- and Th-bearing minerals both for dating mineral formation and for thermochronometry. Fin Stuart, Raphael Pik and Tibor Dunai provided helpful reviews. Mineralogical Society of America , Washington, DC, pp. ISBN 9780939950591 AUTHORS:20121116-080830444 Full text is not posted in this repository. Use this Persistent URL to link to this item: AUTHORS:20121116-080830444The possibility of dating minerals by the accumulation of ^4He from U and Th decay has been recognized for many years (e.g., Strutt 1905), but in the century since the idea was first conceived, the method has rarely been applied successfully. (1996a) found that apatite He ages increase systematically with sample elevation in a mountain range, as expected for exhumation-induced cooling through a low closure temperature. 2000) constraints on He diffusivity, recent attention has focused on applications of apatite He thermochronometry. This work was supported by the National Science Foundation and by a fellowship award from the David and Lucille Packard Foundation.
In 1987, Zeitler and coworkers rekindled interest in the method by proposing that in the case of apatite, He ages might be meaningfully interpreted as ages of cooling through very low temperatures. For example, Lippolt and coworkers have undertaken detailed studies of He diffusion and dating of various phases, most notably hematite formed in hydrothermal systems (Lippolt and Weigel 1988; Wernicke and Lippolt 1992; Lippolt et al. Here I present an overview of recent techniques, calibrations, and applications of the (U-Th)/He dating method; Hurley (1954) provides an excellent summary of earlier work in this field.
Laboratory diffusion data presented by these authors indicated a closure temperature of about 100ºC, a value supported by more recent studies (Lippolt et al. Much of this paper focuses on apatite, because the He behavior and requisite analytical techniques are better established for this phase than for other target minerals, such as zircon and titanite.
It is one of the worst places known to man and is MIT's pimp. Most of the students' lab work consists of attempting to set buildings on fire.
The fireproof Blacker Laboratory of Pyrotechnics is the main venue set aside by the administration for this activity.
However, students will often try their luck elsewhere.
Nevertheless, due to the buildings' high intelligence and mobility, not a single one has so far been burned down, and therefore no student has yet graduated from Caltech.