@article{fdi:010035663,
  title = {{O}xygen isotope analyses of fine silica grains using laser-extraction technique : comparison with oxygen isotope data obtained from ion microprobe analyses and application to quartzite and silcrete cement investigation},
  author = {{A}lexandre, {A}. and {B}asile {D}oelsch, {I}sabelle and {S}onzogni, {C}. and {S}ylvestre, {F}. and {P}arron, {C}. and {M}eunier, {J}.{D}. and {C}olin, {F}abrice},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he laser fluorination technique reported here for analyzing the oxygen isotope composition (delta {O}-18) of fine quartz size fractions 50-20, 20-10, 10-5, 5-2, 2-1 and < 1 mu m has been validated by comparison with the ion microprobe technique. {I}t yields accurate 61 8 0 data with an external precision better than 0.15%.. {T}his is a significant methodological improvement for isotopic studies dealing with materials such as soil or biogenic oxides and silicates: particles are often too small and recovered in insufficient amount to be easily handled for ion microprobe analysis. {B}oth techniques were used to investigate delta {O}-18 composition of a {C}retaceous quartzite and silcrete sequence from the {S}outh-{E}ast of {F}rance. {Q}uartzite cements average 31.04 +/- 1.93%.. {T}hey formed from {M}id-{C}retaceous seawater. {H}igher in the series, silcretes cements average 26.66 +/- 1.36%. {T}hey formed from {U}pper- or post- {U}pper-{C}retaceous soil water and groundwater. {O}xygen isotope data show that the silicification steps from one mineralogical phase to another and from one layer to another (including from an upper pedogenic silcrete to a lower groundwater silcrete) occurred in a closed or weakly evaporating hydrological system. (c) 2006 {E}lsevier {I}nc. {A}ll rights reserved.},
  keywords = {{FRANCE}},
  booktitle = {},
  journal = {{G}eochimica {E}t {C}osmochimica {A}cta},
  volume = {70},
  numero = {11},
  pages = {2827--2835},
  ISSN = {0016-7037},
  year = {2006},
  DOI = {10.1016/j.gca.2006.03.003},
  URL = {https://www.documentation.ird.fr/hor/fdi:010035663},
}