Radiogenic argon and strontium diffusion parameters in biotite at low temperatures obtained from Alpine Fault uplift in New Zealand

Details Radiogenic argon and strontium diffusion parameters in biotite at low temperatures obtained from Alpine Fault uplift in New Zealand Radiogenic argon and strontium diffusion parameters in biotite at low temperatures obtained from Alpine Fault uplift in New Zealand

Jan 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26...67h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 26, Issue 1, pp.67-80

Computer Science

12

Scientific paper

Rapid uplift along the Alpine Fault zone in New Zealand has exposed ancient mica schists which are estimated to have been at depths up to 9000 ft prior to the fault displacement, on the assumption that the smooth surface represented by the present, flat topped, peak elevations is truly representative of the mature Pliocene surface prior to uplift and glaciation. K-Ar age measurements on the micas show losses of radiogenic argon that vary with depth of burial up to almost complete loss from biotite at a depth of 9000 ft. The mean value of the diffusion parameter ( D / a 2 ) calculated is 6 × 10 -16 sec -1 at an estimated temperature of 110°C. This value is much higher than expected but is compatible with effectively complete retention of argon at surface temperatures, and with measured diffusion losses at high temperatures, if in the relationship D / a 2 = ( D 0 / a 2 ) exp (- E / RT ) D 0 / a 2 = 1 sec -1 and E = 27 Kcals / mole . A single Rb-Sr analysis on one of the low argon biotite samples showed an almost equal loss of radiogenic Sr 87 .

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