@article{PAR00003597,
  title = {{D}etermination of rapid {D}eccan eruptions across the {C}retaceous-{T}ertiary boundary using paleomagnetic secular variation : 2. {C}onstraints from analysis of eight new sections and synthesis for a 3500-m-thick composite section},
  author = {{C}henet, {A}. {L}. and {C}ourtillot, {V}. and {F}luteau, {F}. and {G}{\'e}rard, {M}artine and {Q}uidelleur, {X}. and {K}hadri, {S}. {F}. {R}. and {S}ubbarao, {K}. {V}. and {T}hordarson, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he present paper completes a restudy of the main lava pile in the {D}eccan flood basalt province (trap) of {I}ndia. {C}henet et al. (2008) reported results from the upper third, and this paper reports the lower two thirds of the 3500-m-thick composite section. {T}he methods employed are the same, i.e., combined use of petrology, volcanology, chemostratigraphy, morphology, {K}-{A}r absolute dating, study of sedimentary alteration horizons, and as the main correlation tool, analysis of detailed paleomagnetic remanence directions. {T}he thickness and volume of the flood basalt province studied in this way are therefore tripled. {A} total of 169 sites from eight new sections are reported in this paper. {T}ogether with the results of {C}henet et al. (2008), these data represent in total 70% of the 3500-m combined section of the main {D}eccan traps province. {T}his lava pile was erupted in some 30 major eruptive periods or single eruptive events ({SEE}), each with volumes ranging from 1000 to 20,000 km 3 and 41 individual lava units with a typical volume of 1300 km(3). {P}aleomagnetic analysis shows that some {SEE}s with thicknesses attaining 200 m were emplaced over distances in excess of 100 km (both likely underestimates, due to outcrop conditions) and up to 800 km. {T}he total time of emission of all combined {SEE}s could have been (much) less than 10 ka, with most of the time recorded in a very small number of intervening alteration levels marking periods of volcanic quiescence (so-called "big red boles'). {T}he number of boles, thickness of the pulses, and morphology of the traps suggest that eruptive fluxes and volumes were larger in the older formations and slowed down with more and longer quiescence periods in the end. {O}n the basis of geochronologic results published by {C}henet et al. (2007) and paleontological results from {K}eller et al. (2008), we propose that volcanism occurred in three rather short, discrete phases or megapulses, an early one at similar to 67.5 +/- 1 {M}a near the {C}30r/{C}30n transition and the two largest around 65 +/- 1 {M}a, one entirely within {C}29r just before the {K}-{T} boundary, the other shortly afterward spanning the {C}29r/{C}29n reversal. {W}e next estimate sulfur dioxide (likely a major agent of environmental stress) amounts and fluxes released by {SEE}s: they would have ranged from 5 to 100 {G}t and 0.1 to 1 {G}t/a, respectively, over durations possibly as short as 100 years for each {SEE}. {T}he chemical input of the {C}hicxulub impact would have been on the same order as that of a very large single pulse. {T}he impact, therefore, appears as important but incremental, neither the sole nor main cause of the {C}retaceous-{T}ertiary mass extinctions.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch - {S}olid {E}arth},
  volume = {114},
  numero = {},
  pages = {{B}06103},
  ISSN = {0148-0227},
  year = {2009},
  DOI = {10.1029/2008jb005644},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00003597},
}