@article{fdi:010054142,
  title = {{S}pectrocolorimetric interpretation of sedimentary dynamics : the new "{Q}7/4 diagram"},
  author = {{D}ebret, {M}. and {S}ebag, {D}avid and {D}esmet, {M}. and {B}alsam, {W}. and {C}opard, {Y}. and {M}ourier, {B}. and {S}usperrigui, {A}. {S}. and {A}rnaud, {F}. and {B}entaleb, {I}. and {C}hapron, {E}. and {L}allier-{V}erges, {E}. and {W}iniarski, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{C}olour is a fundamental property of sediment and is often used for lithographic description to determine sedimentological structures, fades etc. {H}owever, the sedimentary information contained in this parameter is difficult to extract because it is difficult to quantify. {C}olour can be quantified by spectrocolorimetry which provides very high resolution data quickly and non-destructively. {W}hen adapted to sedimentology, spectrocolorimeters prove to be powerful tools due to their low purchase and maintenance costs, and some are portable and easily used in-the-field. {S}everal methods have been used to extract sedimentological data from colorimetric spectra (first derivatives, factorial analysis, etc.). {I}n the present study, we first provide a review of the sedimentological application of spectrophotometers and, after having described these methods, their advantages and disadvantages, we then describe a new tool called the {Q}7/4 diagram (abscissa {L}*; {O}rdinates 700/400 ratio). {T}his new technique permits sedimentological units to be defined, allows the identification of different sediment components and provides 5 distinct poles: {C}layey deposits, organic rich deposits (chlorophyll a and by products), altered organic matter deposits, iron rich deposits, carbonated deposits. {C}oupled with the analysis of first derivative spectra, it is possible to distinguish different pigments linked to the degradation and/or nature of the organic material ({C}hlorophyll a, melanoidin, etc.), the state of iron oxidation (for example, hematite and goethite-like signatures) and the nature of clays. {T}he {Q}7/4 diagram permits rapid acquisition of high resolution data on changes of sediment dynamics in geosystems that have been subjected to highly varied climatic/environmental conditions. {T}he instrument is non destructive, easy to use and maintain, portable for use in the field, fast to implement, is capable of high resolution, and has a vast range of possible applications. {S}pectrocolorimetry appears to provide many advantages and could become an essential and robust tool for preliminary sedimentological studies.},
  keywords = {{S}pectrophotometry ; {R}eflectance ; {Q}7/4 diagram ; {S}edimentary dynamics ; {O}rganic matter},
  booktitle = {},
  journal = {{E}arth-{S}cience {R}eviews},
  volume = {109},
  numero = {1-2},
  pages = {1--19},
  ISSN = {0012-8252},
  year = {2011},
  DOI = {10.1016/j.earscirev.2011.07.002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010054142},
}