@article{fdi:010064754,
  title = {{D}iatom, phytolith, and pollen records from a {B}e-10/{B}e-9 dated lacustrine succession in the {C}had basin : insight on the {M}iocene-{P}liocene paleoenvironmental changes in {C}entral {A}frica},
  author = {{N}ovello, {A}. and {L}ebatard, {A}. {E}. and {M}oussa, {A}. and {B}arboni, {D}. and {S}ylvestre, {F}lorence and {B}ourles, {D}. {L}. and {P}ailles, {C}. and {B}uchet, {G}. and {D}ecarreau, {A}. and {D}uringer, {P}. and {G}hienne, {J}. {F}. and {M}aley, {J}ean and {M}azur, {J}. {C}. and {R}oquin, {C}. and {S}chuster, {M}. and {V}ignaud, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} discontinuous 200 m-long borehole drilled in the {B}ol {A}rchipelago (13 degrees {N}, {L}ake {C}had) provided 25 samples, which were dated using the {B}e-10/{B}e-9 method and analyzed for their micro-biological content. {T}he dating provided ages ranging from 63 +/- 0.1 to 2.6 +/- 0.1 {M}a, a period contemporaneous with the {P}liocene fossil localities located in the current {D}jurab desert of {C}had (16-17 degrees {N}). {W}ell-preserved diatom assemblages first occurred at 4.7 +/- 0.1 {M}a and were dominated by the freshwater planktonic genera {A}ulacoseira and {S}tephanodiscus until the end of the {P}liocene. {T}his supports the recurrence of lacustrine conditions at {B}ol during all the {P}liocene. {T}he presence of pelite and argillaceous deposits in the core before 4.7 +/- 0.1 {M}a, however, suggests that the lake settled earlier, at least since 6.3 +/- 0.1 {M}a. {T}he abundance of {A}fromontane pollen taxa at 4.2 +/- 0.1 {M}a and the occurrence of trapeziform polylobate phytoliths throughout the sequence suggest significant vegetation inputs from the southern highlands, while the importance of kaolinite in the clay sediments indicates a water supply predominantly from the south during the {P}liocene. {P}hytolith assemblages are all dominated by lobate grass silica short cells and by blocky and elongate types, which attest to the presence of herbaceous-dominated vegetation around {B}ol and/or in the southern drainage basin during the {P}liocene. {T}his result is also supported by the pollen assemblage described at 4.2 +/- 0.1 {M}a, which shows highest affinity for the savanna biome. {M}oreover, low values for the {X}erophytic grass phytolith index indicate the presence of humid-loving (mesophytic and aquatic) grass communities in this vegetation. {A}t last, significant variations in the abundance of blocky and elongate phytoliths are indicative of local alternations of fully lacustrine and marshy conditions at {B}o!. {P}articularly between 3.6 and 2.7 {M}a, the abundance of silicified bulliform cells combined with the absence of diatoms support a significant lacustrine reduction at {B}ol favoring the increasing of local marshy vegetation.},
  keywords = {{L}ake {C}had ; {S}ahara-{S}ahel ; {M}iocene-{P}liocene ; {V}egetation ; {C}limate ; {H}ominin ; {AFRIQUE} {CENTRALE} ; {SAHARA} ; {SAHEL} ; {TCHAD} {BASSIN}},
  booktitle = {},
  journal = {{P}alaeogeography {P}alaeoclimatology {P}alaeoecology},
  volume = {430},
  numero = {},
  pages = {85--103 + corrigendum, 2016, 442, p. 128},
  ISSN = {0031-0182},
  year = {2015},
  DOI = {10.1016/j.palaeo.2015.04.013},
  URL = {https://www.documentation.ird.fr/hor/fdi:010064754},
}