@article{PAR00007586,
  title = {{C}enozoic forearc basin sediments in {S}outhern {P}eru (15-18 degrees {S}) : stratigraphic and heavy mineral constraints for {E}ocene to {M}iocene evolution of the {C}entral {A}ndes},
  author = {{D}ecou, {A}. and von {E}ynatten, {H}. and {M}amani, {M}. and {S}emp{\'e}r{\'e}, {T}hierry and {W}orner, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} large sedimentary forearc basin developed in {C}enozoic times between the present-day {C}oastal {C}ordillera and the {W}estern {C}ordillera of the {C}entral {A}ndes, called {M}oquegua basin in southern {P}eru. {T}he basin is filled by {M}oquegua {G}roup deposits (similar to 50 to 4 {M}a) comprising mostly siliciclastic mudstones, sandstones and conglomerates as well as volcanic intercalations. {S}everal facies changes both, along orogenic strike and through time, are described and have led to subdivision into four sedimentary units ({M}oquegua {A}, {B}, {C} and {D}). {I}n this paper we present a refined stratigraphic scheme of the {M}oquegua {G}roup combined with the first provenance analysis of the {M}oquegua basin based on (i) semi-quantitative analysis of heavy mineral abundance, (ii) electron microprobe ({EMP}) and laser ablation ({LA}) {ICP}-{MS} analyses of single detrital amphibole and {F}e-{T}i oxide grains, and (iii) comparative analysis of the different potential source rocks to clearly identify the most likely sources. {R}esults allow us to reconstruct sediment provenance and to relate changes of the erosion-sedimentation system in the {M}oquegua basin to the evolution of the {A}ndean orogen. {A}t similar to 50 to similar to 40 {M}a the {M}oquegua basin was close to sea level and fed by low energy rivers transporting mainly metamorphic basement and {J}urassic-{C}retaceous sedimentary detritus from local and distal sources. {T}he latter might be as far as the present {E}astern {C}ordillera. {F}rom similar to 35 {M}a on the distal sediment sources were cut off by the uplift of the {A}ltiplano and {E}astern {C}ordillera leading to higher energy fluvial systems and increasing importance of local sources, especially the relevant volcanic arcs. {F}rom 25 {M}a on volcanic arc rocks became the predominant sources for {M}oquegua {G}roup sediments. {T}he 10 {M}a time lag observed between the onset of uplift-induced facies and provenance changes (at similar to 35 {M}a) and the onset of intense magmatic activity (at similar to 25 {M}a) suggests that magmatic addition was not the main driver for crustal thickening and uplift in the {C}entral {A}ndes during latest {E}ocene to {O}ligocene time.},
  keywords = {{A}ndes ; {C}enozoic, provenance analysis ; {H}eavy minerals ; {G}eochemistry ; {A}mphibole ; {F}e-{T}i oxide},
  booktitle = {},
  journal = {{S}edimentary {G}eology},
  volume = {237},
  numero = {1-2},
  pages = {55--72},
  ISSN = {0037-0738},
  year = {2011},
  DOI = {10.1016/j.sedgeo.2011.02.004},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00007586},
}