@article{fdi:010062244,
  title = {{T}he {I}anapera-{A}mpanihy {S}uture, {SW} {M}adagascar : a major tectonic boundary on the eastern margin of the {M}ozambique belt},
  author = {{R}akotovao, {A}. {P}. and {J}essell, {M}ark and {S}alvi, {S}. and {B}{\'e}ziat, {D}. and {M}ontel, {JM}. and {R}akotondrazafy, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he position of ancient ({P}aleo) suture zones in the crystalline basement of {M}adagascar is still the subject of debate. {T}he {I}anapera area is part of the {N}eoproterozoic {V}ohibory domain, which covers the northern part of the {A}mpanihy {H}igh-{S}train {Z}one ({HSZ}), in the southwestern part of the basement. {B}y combining {L}andsat 7 {ETM}+, airborne magnetic and radiometric data as well as available maps and data, with new field, geochemical and geochronological data in a {GIS}, we have updated the geological map of this region to investigate a supposed suture in this area. {W}e suggest that the proposed suture in {SW} {M}adagascar is a {NNE}-{SSW} major lineament, rather than the 20 km-wide {A}mpanihy {HSZ}. {T}he lineament separates the {V}ohibory high-pressure granulites from the older {A}ndroyan medium-pressure granulites, and can be outlined from the {I}anapera area to the {A}mpanihy region towards the south; accordingly, we named it the {I}anapera-{A}mpanihy {S}uture. {B}ased on field, geophysical and geochemical data, we recognised a suite of granites and syenites, which we named the {I}anapera suite, and a small sheet-like body of granodiorite ({B}evaro granodiorite). {T}he {I}anapera suite contains the only known occurrence of corundum-bearing syenite in the {M}adagascar basement. {T}hese bodies were formed by two distinct episodes of felsic magmatism: respectively, high-{K} calc-alkaline to shoshonitic, and low-{K} calc-alkaline pulses. {T}he composition, mineralogy, as well as a {U}-{T}h-{P}b monazite age of 540 +/- 22 {M}a, is consistent with late to post-collisional emplacement of the {I}anapera suite, reinforcing the hypothesis of a suture in this area. {B}ased on the above data, we suggest a northwards continuation of this suture in {K}enya, as far as the intrusive-hosted {D}usi corundum deposit ({S}imonet et al., 2004). {T}he {I}anapera-{A}mpanihy {S}uture could be the major tectonic boundary suggested as the eastern margin of the {M}ozambique belt, within the central {E}ast {A}frican {O}rogen.},
  keywords = {{I}anapera ; {V}ohibory ; {M}adagascar ; {S}uture zone ; {C}orundum-bearing syenite ; {S}hoshonite ; {MADAGASCAR} ; {MOZAMBIQUE} {CANAL}},
  booktitle = {},
  journal = {{J}ournal of {A}frican {E}arth {S}ciences},
  volume = {94},
  numero = {{SI}},
  pages = {31--44},
  ISSN = {1464-343{X}},
  year = {2014},
  DOI = {10.1016/j.jafrearsci.2013.12.009},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062244},
}