Cosmogenic dating basalt Balkan chat

AA(Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia), AB(Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, Australia; Present address: Department of Medical Radiations Science, Royal Melbourne Institute of Technology, GPO Box 2476V, Melbourne, Victoria 3001, Australia.), AC(Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, Australia; Present address: Department of Medical Radiations Science, Royal Melbourne Institute of Technology, GPO Box 2476V, Melbourne, Victoria 3001, Australia.), AD(Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, Australia; Present address: Department of Medical Radiations Science, Royal Melbourne Institute of Technology, GPO Box 2476V, Melbourne, Victoria 3001, Australia.)Cl production in calcium feldspar from the 17,300 year old Tabernacle Hill basalt.At an altitude of 1445 m and an effective geomagnetic latitude of 40.9 ° the calcium spallation rate is 152 ± 11 atoms (g Ca) at sea level and high latitude.The concentration ratio of ilmenite to pyroxene and olivine is 0.78±0.02, yielding an apparent cosmogenic ^3He production rate of 93.6±7.7 atom g^(-1) yr^(-1) that is 20-30% greater than expected from prior theoretical and empirical estimates for compositionally similar minerals.

Ph D thesis, School of Earth Sciences, The University of Melbourne.Fine-grained phases with low cosmogenic ^3He production rates, like ilmenite, will have anomalously high production rates owing to net implantation of ^3He from the surrounding, higher ^3He production rate, matrix.

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