The transport of osmium from the continents to the oceans
- 出版日期：2002.
- 页数：154 p. :
- 第一责任说明：Gwyneth Ann Williams.
- 分类号：a422.3 ; a371
- ISBN：0493604960(ebk.) :
MARC全文
02h0025418 20110921154247.0 cr un||||||||| 110921s2002 xx ||||f|||d||||||||eng | AAI3046251 0493604960(ebk.) : CNY371.35 NGL NGL NGL a422.3 ; a371 Williams, Gwyneth Ann. The transport of osmium from the continents to the oceans [electronic resource] / Gwyneth Ann Williams. 2002. 154 p. : digital, PDF file. Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1224. ; Adviser: Karl Karekin Turekian. Thesis (Ph.D.)--Yale University, 2002. Understanding the transport of osmium from the continents to the oceans is critical in expanding and refining the utility of osmium isotopes in the Cenozoic paleooceanographic curve as a tracer of past plate tectonic activity and Earth weathering history1. Before we can project into the past, however, we need to comprehend the modern distribution and transport processes of osmium in the surficial environment. This approach will lead us to a modern mass balance for osmium and an accurate estimate of its oceanic residence time. Sample analyses of aerosols, soils, rivers and estuaries constrain the sources and modes of transport of osmium. Restriction of a less radiogenic anthropogenic signal close to pollution sources requires that estuaries act as at least temporary traps for osmium.2 Measurement of aerosols in New Haven, Connecticut indicates that local fluxes of atmospheric osmium may be high, but analogy with 210Pb indicates that the global atmospheric flux of more radiogenic osmium from the continents to the oceans are minor compared to the riverine flux.3 Evidence obtained from the leaching of rapid accumulation rate, reducing sediments of Santa Barbara Basin over the last glacial-interglacial period indicates that seawater osmium was less radiogenic during the last glacial, requires that the residence time of osmium in seawater is -10 ka4.;1Pegram et al (1992). 2Williams et al (1997). 3Williams and Turekian (1998), Williams and Turekian (2002, in press). 4Williams and Turekian (1997) Osmium ; Fluids ; Sediment transport. Analysis. ; Migration. Electronic books. aeBook. aCN bNGL http://proquest.calis.edu.cn/umi/detail_usmark.jsp?searchword=pub_number%3DAAI3046251&singlesearch=no&channelid=%CF%B8%C0%C0&record=1 NGL Bs950 rCNY371.35 ; h1 bs1107