@inproceedings{fdi:010067892,
  title = {{R}apid paleoenvironmental variations in {NE} {B}razil during the {L}ateglacial : insights from {T}p{S}2, {S}3{CO}2 and {S}3{CO} {R}ock {E}val parameters},
  author = {{J}acob, {J}. and {D}isnar, {J}.{R}. and {B}oussafir, {M}. and {K}{\'e}ravis, {D}. and {S}ifeddine, {A}bdelfettah and {S}padano {A}lbuquerque, {A}.{L}. and {T}urcq, {B}runo},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {R}ock-{E}val pyrolysis technique was first developed as a rapid mean for evaluating the petroleum potential of source rocks, via the measurement of bulk organic parameters such as {T}otal {O}rganic {C}arbon ({TOC}), {H}ydrogen {I}ndex ({HI}), {O}xygen {I}ndex ({OI}) and the maximum pyrolysis temperature {T}max ({E}spitali{\'e} et al., 1985; {L}afargue et al., 1998). {T}his method was then used to rapidly estimate organic matter quality and quantity in sedimentary series for paleoenvironmental studies ({T}albot and {L}ivingston, 1989). {R}ecently, it has been proposed that there could be more information gained from the {R}ock-{E}val parameters ({D}isnar et al., 2003). {W}hen considering also the recent analytical developments available from the {T}urbo6 version of the apparatus, there is a large field of investigation that remains unexplored in paleoenvironmental studies. {H}ere we present results from the sedimentary infill of {L}agoa do {C}a{\c{c}}ó ({N}orthern {B}razil) that records paleoenvironmental changes since the {L}ast {G}lacial {M}aximum ({J}acob et al., 2004). {T}he present study focuses on the {L}ateglacial interval (ca. 17,000 to 11,000 cal yrs {BP}), a time period where different {R}ock-{E}val parameters such as {T}p{S}2 ({T}max equivalent), {HI} and {OI} produce controversial information. {I}n order to better understand the meaning of these parameters, we propose an original mean of obtaining more pertinent information. {S}3{CO}2/{S}3{CO} ratio and {T}p{S}2 surprisingly display similar trends over the considered period, in two different cores. {F}urthermore, the evolution of these parameters is comparable with that of ?18{O} in the ice core record of {S}ajama ({B}olivia) during the {L}ateglacial ({F}igure 1). {A}lthough the significance of these parameters and the origin of these variations remain to be cleared, our results confirm a pattern of rapid climate variability over the {S}outh {A}merican {T}ropics during the last deglaciation, as seen in the {N}orthern {H}emisphere.},
  keywords = {{BRESIL}},
  numero = {},
  pages = {2},
  booktitle = {},
  year = {2005},
  URL = {https://www.documentation.ird.fr/hor/fdi:010067892},
}