Search for extinct ^(36)Cl in Ca-Al-rich inclusions in primitive ordinary chondrites

Abstract

The short-lived radionuclide ^(36)Cl decays to either ^(36)Ar (98.1%, β-) or ^(36)S (1.9%, ε and β+), with a half life of 3.01 × 10^5 yr [1]. Recent study has shown that ^(36)S anomalies from the decay of ^(36)Cl exist in sodalite (Na_8Al_6Si_6O_(24)Cl_2) of some Ningqiang CAIs and Allende CAIs and chondrule [2–5], but not in sodalite in other CAIs from Allende or Vigarano [6, 7]. In this study, we have expanded the search for ^(36)S anomalies in primitive ordinary chondrites.

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