Si isotope variability in Proterozoic cherts

@inproceedings{Chakrabarti2012SiIV,
  title={Si isotope variability in Proterozoic cherts},
  author={Ramananda Chakrabarti and Andrew H Knoll and Stein B. Jacobsen and Woodward W Fischer},
  year={2012}
}
We report Si-isotopic compositions of 75 sedimentologically and petrographically characterized chert samples with ages ranging from 2600 to 750 Ma using multi-collector inductively coupled plasma mass spectrometry. dSi values of the cherts analyzed in this study show a 7& range, from 4.29 to +2.85. This variability can be explained in part by (1) simple mixing of silica derived from continental (higher dSi) and hydrothermal (lower dSi) sources, (2) multiple mechanisms of silica precipitation… CONTINUE READING
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