Because of cosmogenic isotopes production, the concentration of cosmogenic isotope in surface layer of the exposed rocks accumulates more and more, and at same time, it becomes less and less with isotope’s radiation and surface’s erosion. With this principle, under the condition of cosmogenic isotopes production rate being well known, the function between the concentrations of cosmogenic isotopes and time and erosion can be calculated. Using this model, we can calculate the exposed ages and erosion rate of the surface. This makes the dating technique be very useful and have a good provision in the study of Geomorphology and Quaternary. In cosmogenic isotopes, 26Al and 10Be deriving from quartz are used most widely and maturely in this field.
XU Xiao-bin, WANG Jian, Françoise Yiou, Grant Raisbeck
. New Means in the Study of Geomorphology and Quaternary——Research of Terrestrial Cosmogenic Isotopes[J]. SCIENTIA GEOGRAPHICA SINICA, 2002
, 22(5)
: 587
-591
.
DOI: 10.13249/j.cnki.sgs.2002.05.587
[1] Simpson J A, Fagot W C. Properties of the low energy nucleonic component at large atmospheric depth[J]. Phys. Rev. 1953,90:1068-1072.
[2] Lal D, Peters B. Cosmic ray produced radioactivity on the earth [J]. In handbuch der physiked. S. Flugge. 1967, 4(2): 167-181.
[3] Erik T, Thomas W, Philippe J, et al. Determination of cosmogenic productionrates of 10Be, 3He and 3B in water[J]. Nuclear Instruments and Methods in Physics Research, 2000,B172:873-883.
[4] Nishiizi K, Lal D, et al. Production of 10Be and 26Al by cosmic rays in terrestrial quartz in situ and implications for erosion rates [J]. Nature, 1986, 319: 134-136.
[5] Edouard B, Grant M, Francoise Y, et al. Solar modulation of cosmogenic nuclide production over the last millennium: comparison between 14C and 10Be records[J]. Earth and Planetary Science Letters, 1997, 150: 453-462.
[6] Francoise Yiou, Karl Diel, et al. Preparation of microgram quantities of carrier-free iodine for AMS analysis[J]. Nuclear Instruments and Methods in Physics Research, 2000, B 172:395-398.
[7] Edward J Brook, Erik T Brown, Mark D Kurz, et al. Constraints on age, erosion, and uplift of Neogene glacial deposits in the Transantarctic Mountains determined from in situ cosmogenic 10Be and 26Al[J]. Geology, 1995, 23(12): 1063-1066.
[8] Paul R, Kimberly A. Carrie Patterson, et al. Mid-Pleistocene cosmogenic minimum-age limits for pre-Wiscinsinan glacial surfaces in southwestern Minnesota and southern Baffin Island: a multiple nuclide approach[J]. Geomorphology, 1999, 27: 25-39.
[9] Gregory S, Robert S, Oliver A. Dating fluvial terraces with 10Be and 26Al profiles: application to the Wind River, Wyoming [J]. Geomorphology, 1999, 27:41-60.
[10] Darryl E, Clifford S, James W, et al. Modulation of erosion on steep granitic slopes by boulder armoring, as revealed by cosmogenic 10Be and 26Al[J]. Earth and Planetary Science Letters. 2001, 186: 269-281.
[11] 王建,徐孝彬.地面测年技术--字生同位素测年[J].地球科学进展.2000,15(2):237～240.
[12] G M Raisbeck, F Yiou. Production of long-lived cosmogenic nuclei and their applications [J]. Nuclear Instruments and Methods in Physics Research, 1984, B 5:91-99.
[13] Reedy, R C, J R Arnold, K. Lal. Cosmic-ray record in solar system matter[J]. Annual Review of Nuclear and Particle Science, 1983, 33: 505-537.
[14] Shea M A, D F Smart, et al. Estimating cosmic ray vertical cut-off rigidities as a function of the Mcllwain L-Parameter for different epochs of the geomagnetic field [J]. Physics of the Earth and Planetary Interiors, 1987, 48: 200-205.
[15] Tibor J Dunai. Scaling factors for production rates of in situ produced cosmogenic nuclides: a critical reevaluation[J]. Earth and Planetary Science Letters, 2000, 176: 157-169.
[16] Erik T Brown, John M Edmond, et al. Examination of surface exposure ages of Antarctic moraines using in situ produced 10Be and 26Al[J]. Geochimica et Cosmochimica Acta 1991, 55:2269-2283.
[17] D Lal. Cosmic ray labeling of erosion surfaces: in situ nuclide production rates and erosion models[J]. Earth and Planetary Science letters, 1991, 104: 424-439.
[18] Jone O, Stone. Air pressure and cosmogenic isotope production [J]. Journal of Geophysical Research, 2000, 105(B10): 23,753-23, 759.
[19] Paul R Bierman, Kimberly A Marsella, et al. Mid-Pleistocene cosmogenic minimum-age limits for pre-Wisconsinsn glacial surfaces in southwestern Minnesota and southern Baffin Island: a multiple nuclide approach[J]. Geomorphology, 1999, 27:25-39.
