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THERMOCHRONOLOGY OF THE AILOSHAN-RED RIVER SHEAR ZONE——A CASE STUDY OF MULTIPLE DIFFUSION DOMAIN MODEL

Chen Wenji(Institute of Geology,State S'eismological Bureau,Beijing 100029)T M Harrison O M Lovera(Dept.of Earth & Space Sci.,UCLA,Los Angeles,CA 90024,U.S.A.)  
Recently,the single-diffusion-domain closure model of Dodson (1973) has been extended to apply to minerals with a discrete distribution of domain size,multi-deffu-sion-domain closure model (Lovera et al.,1989).Because these domains contain a range of closuer temperatures,Lovera et al.(1989) found that a single K-feldspar samples may reveal a broad segment of a cooling history,rather than the single datum usually expected.A study of K-feldspar (FA-2-1) from the Ailao Shan/Red River shear zone,Yunnan,reveals extremely rapid cooling in the interval 20 to 19 Ma using the new model.In consistent with the earlier published analysis involving many biotite samples and a K-feldspar sample collected from Quxu area,southern Tibet.We believe that the two results are related.These two studies underscore the value of using the domain disstribution hypothesis in tectonic studies and presage a revolution in "tectonic geochro-nology
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