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Magnetoestratigrafía Y Paleomagnetismo Del Jurásico Inferior Marino De La Cuenca Neuquina, República Argentina

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Magnetoestratigrafía Y Paleomagnetismo Del Jurásico Inferior Marino De La Cuenca Neuquina, República Argentina Tesis de Posgrado Magnetoestratigrafía y paleomagnetismo del Jurásico Inferior marino de la Cuenca Neuquina, República Argentina Iglesia Llanos, María Paula 1997 Tesis presentada para obtener el grado de Doctor en Ciencias Geológicas de la Universidad de Buenos Aires Este documento forma parte de la colección de tesis doctorales y de maestría de la Biblioteca Central Dr. Luis Federico Leloir, disponible en digital.bl.fcen.uba.ar. Su utilización debe ser acompañada por la cita bibliográfica con reconocimiento de la fuente. This document is part of the doctoral theses collection of the Central Library Dr. Luis Federico Leloir, available in digital.bl.fcen.uba.ar. It should be used accompanied by the corresponding citation acknowledging the source. Cita tipo APA: Iglesia Llanos, María Paula. (1997). Magnetoestratigrafía y paleomagnetismo del Jurásico Inferior marino de la Cuenca Neuquina, República Argentina. Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. http://digital.bl.fcen.uba.ar/Download/Tesis/Tesis_2962_IglesiaLlanos.pdf Cita tipo Chicago: Iglesia Llanos, María Paula. "Magnetoestratigrafía y paleomagnetismo del Jurásico Inferior marino de la Cuenca Neuquina, República Argentina". Tesis de Doctor. Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. 1997. http://digital.bl.fcen.uba.ar/Download/Tesis/Tesis_2962_IglesiaLlanos.pdf Dirección: Biblioteca Central Dr. Luis F. Leloir, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Contacto: [email protected] Intendente Güiraldes 2160 - C1428EGA - Tel. (++54 +11) 4789-9293 Magnetoestratigrafía y Paleomagnetismo del Jurásico Inferior marino de la Cuenca Neuquina, República Argentina Tesis Doctoral en Ciencias Geológicas Autora: María Paula Iglesia Llanos Director: Haroldo Vizán UNIVERSIDAD DE BUENOS AIRES Facultad de Ciencias Exactas y Naturales D artamento de Ciencias Geoló icas ¡_ °p g Qeal“ oq 62/ Año:1997 ól l k A mispadres Maria Paula Iglesia Llanos “Magnetoesrraligrafia y Paleomagnerismodel Jurásico Irfizrior... " Indice Abetmct S “ 6 ¡V J . A 7 Abreviaturasutilizada 9 '+ J " 10 [A L ; A (“3' L' 15 l. Geologíay Estratigrafia del Jurásico A ." ‘ J ‘ 16 1.ElJurásicoenla.A a 4 16 2. ElJurásicoenla Cuenca}r _ ' 24 a. "“ " " 24 b. Origen y decarmlln 24 c.Reseña4*: " 27 3. P' 4 "v " 31 B.Geologíadelasáreas 4" ‘ 43 l. Región del n'o Atuel (provincia de ‘ ‘ ‘ ) 43 a Perfil del arroyo Malo 43 i. [1. .. 43 ii. .‘ ‘ J 4 43 lkscn'pcíón 45 iv. T“ ‘ "U a S4 b. Perfil del arroyo Las (‘hilcm 56 í. I ,L. , 56 ii. .‘ ‘ ‘ ‘ 56 iii. Descripción 59 iv. P' ‘ "U " 66 V. Obbcl i 67 c. Perfil de Puesto Araya 67 í. I'L' " 67 ii. , ‘ ’ ‘ 68 iii. Descripción 70 iv. P' ‘ "y " 74 2. Región de la Cordillera del Viento (província del I ' _ ' ) 77 a. Perfil Pajapn'n 77 í.Il. ., 77 ii. ‘ ‘ ‘ 77 iii_Mañpción 80 iv. P' "7 ‘Ta 87 V. ObbCl ' 87 b.PerfilChacay“"‘ ‘ 89 í. ¡1- u 89 Universidad de Buenos Aires. I997 l Maria Paula Iglesia Llanos 'Magneloestratigrqïa y Paleomagnelianodel Jurásico Irgferior..." ii. A ‘ ’ é 89 iii. ¡Bcn'príón 90 iv. P‘ ‘ "v “ 93 3. Región de Charahuilla (provincia del I' A ' ) 93 a. Perfil del arroyolara 93 i. Ï'L' ' ' 93 ii. 1‘ ‘ ’ A 93 iii. lkscn'pción 94 iv.ï" ‘ "v " lOl 2. Determinacióny Anális de losdatos paleomagnéticosy magnetoestratigráficos delJurásico Inferior Simbolos utilizados en el Capítulo 2 105 A (‘ " J J 106 B. .‘ 4 J ‘ 106 C. Estudios paleomagnéficos y magnetoestratigráficos del Jmásico en la 1‘ a 4 110 l. .‘ ‘ ‘ ‘ l lO D.‘ ‘4 ’ ' v lll l. Técnicasdempn lll 2. Técnicasdeï L ‘ ¡u 112 E. Análisis de los comportamientos y propiedades magnéticas de las muestras. Determinación de las direcciones magnéticas 113 l. Determinación de las polaridades magnéficas l 18 F.Estudiopaleomagnéficodel delaCuencaNeuquina............l19 l. Análisis de las componentes magnéticas en los perfiles de los arroyos Malo y las Chilcas (región del río Amel, Mendoza)......................122 a. Perfil del arroyo Malo 120 b. Perfil del arroyo Las (‘hilms 127 2. Determinación de las direcciones magnéticas 132 3. Pruebas para evaluar la edad de las magnetizaciones aisladas 134 4. ObScr . 137 G. Estudio paleomagnético del Pliensbaquiano-Toarciano de la Cuenca Neuquina .........145 l. Perfil de Puesto Araya (región del n'o Atuel, ‘ ‘ ‘ ) 145 a. Determinaciónde las direcciones T“ 145 b. Obscr ' 148 c. Pruebaspamevaluarlaedaddelasmagnetimciones aisladas..........................151 2. Perfil de RajapaJo-Chacay Melehue (región de la Cordillera del Viento,2' 1 ' ) 154 a. Valoración de las propiedades magnéticas de las + 154 b. Determinación de las direcciones magnéticas 159 c. Estudios y pruebas para evaluar la edad de las magnetimciones aisladas ........164 3. Perfil del arroyo Lapa (región de Charahuilla, Ï' 1 ' ) 168 a Determinación de las direcciones m 168 Universidad de Buenos Aires. I 997 2 María Paula Iglesia Llanos "Magneraesrralignfia y Paleomagnerimo del Jurásico hfizrior... " b. Pmebasparaevaluarlaedaddelasmagneu'mciones aisladas..........................l74 c. Cbacr ' 174 3. Magnetoestratigrafia del Jurásico Inferior de la Cuenca Neuquina A .‘ ‘ J ‘ 178 B. Biozonas de amonites y polaridades magnéticas de secciones de Europa y correlación con las biozonas de .‘ U "' 182 C. Criterios de valoración de los estudios magrretoestratígráficos para el Jurásico T r 185 D. MagnetoestrarigrafiadelJurásico Inferiorde laCuencaÏ' _ ' l9l l. ' “ * " 191 a. Perfil del arroyo Malo (región del río Atuel, ‘ ' J ) 193 b. Perfil del arroyo las Chilcas (región del río Atuel, ‘ ‘ " ) 195 c.PerfildePtmtoAraya(regióndelrío Anrel,“ J ) 197 d. Perfil de Rajapalo-Chacay Melehue (región de la Cordillera del Viento, Ï' 1 ' ) 199 e. Perfildel arroyolapa(regióndeCharahuilla,Ï' _ ' ) 202 2. Escala magnetoestrafigrafim compuesta de la Cuenca Neuquina ........................205 a. ' “ * " 205 b. “ " ‘ 209 i. Hettangiano-Si ' 209 ii. Plíensbaquiano-T ' 218 E. Correlación de las escalas bie Ü ‘ ‘ "y " local e internacional..................226 l. l' “ Ü' 228 2_Sinemuriann 11] 3. P" L 1 ' 235 4. T ' 242 4.Geodinámicadela Pangm durante elJurásico Tprano a Medio A r L l -I 249 B. .‘ ‘* J 4 250 C. Polos paleomagnéticos de América del Srn'para el Jurásico Temprano a Malin 754 l. PPs obtenidos en este Khldio 254 a Henangiano-S'Lnemuñano 254 b. Pliensbaquiano-T ' 255 2. Otros PPs de América del Sur 256 3. Paleolan'tudes de la Cuenca I' _ ' 260 4. CDPA de América del Sur 264 D. Polos paleomagnéticos de Eurasia para el Jurásico Temprano a Medio........................267 E. Ajuste estadístico entre los PPs de Eurasia y América del Sur 269 l. ' “ ‘L ' ' 269 2. “ " ‘ 774 3. T" ' ’ 274 F. CDPA de Eurasia y su relación con la de América del Sur 278 Universidad de Buenos Aires, 1997 3 Maria Paula Iglesia Llanos “Magmtoes'tratigrqfiay Paleomagnen'mo del Jurásico Inferior... " G. Reconstruccíones absolutas de la Pangea para el Jurásico Temprano a Medio............282 l. ' ‘“ * " 282 2.l 1.4.l | U H Configuración paieogegráfica de la Pangea y paieolatitudes estimadas para el Hettangiano-Sinemuríano (200 Ma), Plíensbaquiano-Toarciano Medio (190 Ma) y Toarcíano Tardio-Bathoniano (180 Ma) 284 l. ' r ‘ ' ' 284 2. “ “ ‘ 287 a. Hettangiano-Sínemm'iano (200 Ma) 287 b. Pliensbaquiano-Toarcíano Medio (190 Ma) 288 c. Toarciano Tardío-Barhoniano (180 Ma) 791 (‘ ' 296 Apéndice l (Perfil de los arroyosMalo y N'M‘m) 301 Apéndice2 (Perfil del arroyoLas milan) 305 Apéndice 3 (Perfil de Puesto Araya) 307 Apéndice4(Perfil Rajapalo-Chacay" ' ' j 309 Apéndice 5 (Perfil del arroyo I apa) 314 Bit" v g 317 Universidadú BuenosAires, l 997 María Paula Iglesia Llanos ‘Magnelaeslraligrafiay PaleomagnenlvnodelJunín'w Irjen'or... " mmmuhmmmmmwmmmmmmAWCÜMWkadeWWWdeüNm WambkbrmfimmaguohafldeJewEMym:l)WMmhhdmgmdmeSGnhanHmfispbae.Smdtaiamwomsdbrtbwduafimofúcqn&ydmgnaomzfigwüc Modwlicbshafldnotbebeyondtbemgeofanammonitebiomnqie. l,l-1,4my.,2)Deu¡iled mmnpmmdmmmmmwmmmWWMS)PWWMMMÓ)SMJWWWWMmmmhüümmhmfiabühyofthemmmfim WhhmsmmmmummmmmflstmnmageafiwhddeMthárwhwdfithmghplmmfiahwdaumdmmmdáfic mmmmmmmofmmemhmmmwmmMmmmmmgnedcsymofflnadmbbdced.hwoümhthedaanfimfimof WMbhmühWWmfithMMmWefiddmedmbmflnmgneficveammmepodfimmeypmdnhmadnm mhvuywmonbMflnofighflmguficñnfimfiomNumpMabjnmdmpcfide MoAmyaFomfionmalaflnedwmww6S,whamamlmcmasdnmnmm compúses 14 mese polarity zona (Al-Mr) and 13 normal polarity zonas (A143 ) recorded in 17 annmnites mmmmmmmñwmhmmmommmmbamhbiozoneswhichinnmcorrdmewfithflpolarityzonesreprmdin lóammotútebiomnesoftlneomidaed WmmmlehflnWWMMTwúmhmbyMáfimfiuopemddnSwflmstanPadficAMZmOnüsbafidmguhhMoml mmhmmmmmdmwümmmmmmmmmMmmmmmmhmmmWMmm PPsfirSomhAnniawu'eobmimd.omC‘RAÜbmadaWBSJ'ELmSóraA”=4°mupaúgtoMmmmmmmmlwmyfiwwfi's,AgfiZTmesponfingmdn WTmBodnpolapasmyplmgficfiddmaMqufifiduQ=lhkm WnamlfiwmklsWambawemhmfimmgim(ZWMy)udmeEa1yPfimsbadfim(lmMyxtheeonúmüfld MXMWWHWÜIWOÏRWWPMÍOW padeanymdms.htfisMyñkaMdnhgfitHflmgimSümnün(2WMy)Smnh MMTwám(l9&luMy)memmfimbubmdhbmeoámmAmbwufldhvebembandnüghlafinflqwñhkajaprfmdedm&50-WS;WR ' MeldneatZS°S,mdfimntheIAeToudanmflatleastanddlehnssic(l70My)ñwuúd plumslmeandageofthealspat 190My,whichmggcstssinflartñreaiom,mtuandagesofcfisplmmn hEfiwafldMthWofmhbWflmfisWWMmmmMMMWW.WMMWMWMMmWhMMW wmdamfl'natlnnplatetectonics.HmdmingtbeHdnngiamSinamñanQOOMaLngmwouldtmebem bmdmñsmmtuiypoáfimmddmhwadmshifiedmrthwmdsaaügbmemlflrmMWhMaMeTummammmflamhafiofhm hnsicBiogwgmpHmldatafinmflnNoMmHmfispluemrútesfinmsmaboMmmmonmmofwmmmmmmmmmm oonsista'ltwiththe AmaiaudñnaáammposedahogahahtüsmnymdmwmAPWP.wfidlmbeusedmardüumm appmisemagúmdemddimcfionsofdispmhothereonfinans. Universia! de BuenosAires. 1997 S María Paula Iglesia Llanos 'Magnetoestrarigrafia y Paleomagnerimo del Jurásico Iry‘en'or..." wammmadmmmmmmmuResumen:MWgnfiadedlmfimMaíamwahCnm
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