the two‐faced mica
作者:
Derek York,
Margarita Lopez Martinez,
期刊:
Geophysical Research Letters
(WILEY Available online 1986)
卷期:
Volume 13,
issue 9
页码: 973-975
ISSN:0094-8276
年代: 1986
DOI:10.1029/GL013i009p00973
数据来源: WILEY
摘要:
We explain two common40Ar/39Ar age spectra shapes in biotite. One features a dip in ages at mid‐temperature regions of the spectrum. The other has exactly the opposite characteristic, i.e. a bump upwards in age at the same position. The explanation assumes that the vast majority of biotites consist of two almost completely independent K‐Ar phases. During laboratory step‐heating of irradiated biotite, the argon from these two phases is separated via release over two different temperature ranges. Biotite is therefore a clock with two
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