收稿日期: 1999-06-08
修回日期: 1999-08-16
网络出版日期: 2000-04-01
基金资助
国家重点基础研究项目“青藏高原隆升与环境变化”(编号:KZ951-A1-204)资助。
TECHNIQUE FOR SURFACE DATING—COSMOGENIC ISOTOPES DATING
Received date: 1999-06-08
Revised date: 1999-08-16
Online published: 2000-04-01
王 建，徐孝彬 . 地面测年技术——宇生同位素测年[J]. 地球科学进展, 2000 , 15(2) : 237 -240 . DOI: 10.11867/j.issn.1001-8166.2000.02.0237
Cosmogenic isotopes dating is a new technique.It can measure the surface exposure age of geomorphic surface in the age range of 103to 106years.Possible candiates of isotopes used for dating include3He,10Be,21Ne,26A1,36Cl.Cosmogenic isotope concentration in the surface rock is a function of age and erosion rate.This technique has great potential in Geo-surface dating.It can be used to date the glaciation events,volcanic activities,faulting rates,flooding and mud flow events and geomorphological processetc.In a word,in-situ cosmogenic isotope and cosmogenic dating technique is applicable to date the rock surface
that is impossible to be dated by the traditional technique.With the development and the wider application of this technique,geomorphology would be push forward faster.
Key words： Cosmogenic isotopes dating; Exposure age; Surface dating.
〔1〕Davis R,Schaeffer O A.Chlorine-36 in nature〔J〕.Ann NY Acad Sci,1955,62:105～122.
〔2〕Srinivasan B.Barites:anomalous xenon from spallation and neutroninuduced reactions〔J〕.Earth Planet Sai Lett,1976,31:129～141.
〔3〕Yokoyama Y,Reyss J,Guichard F.Production of radionuclides by cosmic rays at mountain altitudes〔J〕. Earth Planet Sci Lett,1977,36:44～56.
〔4〕Cerling T E.Geomorphology and in-situ cosmogenic isotopes〔J〕.Annu Rer Earth Planet Sci,1994,22:273～317.
〔5〕Brown E T, Brook E J, Raisbeck G M,et al. Effective attenuation lengths of cosmic rays producing10Be and 26Al in quartz:Implications for expoure age dating〔J〕.Geophys Res Lett,1992,19:369～372.
〔6〕Granger D E,Kirchner J W,Finkel R.Spatially averaged long-term erosion rates measured from in situ-produced gosmogenic nuclides in alluvial sediment〔J〕. The Journal of Geology,1996,104:249～257.
〔7〕Dorn R I,Phillips R N,Zreda M G,et al.Glacial chronology〔J〕.Natl Geogr Res Expl,1991,7:456～471.
〔8〕Poths J,Crowe B M.Surface exposure ages and noble gas components of volcanic units at the Lathrop Wells Volcanic center,Nevada〔J〕.Eos Trans Am Geophys union,1992,73(43):610.
〔9〕Ohillips F M,Age and geomorphic history of Meteor Crater,Arizona,from cosmogenic 36Cl and 14C in rock varnish〔J〕.Geochim Cosmochim Acta,1991,55:2 695～2 698.
〔10〕Sutton S R.Thermoluminescence measurements on shock-metamorphosed sandstone and dolomite from Meteor Crater,Arizona〔J〕.J Geophys Res,1985,90:3 690～3 700.
〔11〕Ritz J F,Brown E T,Bourles D L,et al.Slip rates along active faults estimated with cosmic-ray-exposure dates:Application to the Bogd fault,Gobi-Altai,Mongolia〔J〕.Geology,1995,23(11):1 019～1 022.
〔12〕Robert S Anderson,James L Repka,Gregory S Dick.Explicit treatment of inheritance in dating depositional surfaces using in situ10Be and 26Al〔J〕.Geology,1996,24(1):47～51.
〔13〕Cerling T E,Webb R H,Poreda R J,et al.Cosmogenic3He ages and frequency of late holocene debris flows from prospect Canyon,Grand Canyon USA〔J〕.Geomorphology,1999,27:93～111.
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