geologia 2 Flashcards

1
Q

kontinenteen jitoa

A

300 milioi : PANGEA
zatitu eta banatu
frogak
1. geografiko : plaka kontinentalak elkar ahokatu
2. paleoklimatiko: kontinenteetan kasko glaziar baten arrastoak ikusgai
3. geologiko: harri formazioak hasiera jarraipena 2 kont desberdinetan
4. paleontologiko : garai bereko izakien fosilak 2 kont desberdinetan

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2
Q

alfred wegener jitoaren arazoa

A

ez zuen azaldu kontinenteen higiduren zergatia

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3
Q

ozeano hondoaren hedapena

A

ww2 sonarrak, underwater maps
dortsal ozeanikoak aurkitu
ozeano hondoko mendilerro handiak

HARRY HESS

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4
Q

plaken tektonikaren postulatuak

A
  1. litosfera banatuta= plaka litosferiko
  2. plaka ozeaniko exlusivo / mostly mixed
  3. 7 nagusi + 6 ertain + mikroplaka+++
  4. plakak higitu = ukitze ertzetan jarduera geologiko nagusi
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5
Q

dortsal ozeanikoen ezaugarriak

A
  • jatorri bolkanikoko goraguneak = jarduera bolkaniko handia
  • dortsaletik urrunago = harri zaharrago
  • ez daude sedimentuz estalita ( urrunago sedimentu geruza lodiagoa)
  • dortsalaren 2 aldeetan zerrenda paleomagnetiko simetrikoak
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6
Q

plaken tektoniken teoria

A

70-80’s
dortsal ozeaniko **HONDO OZEANIKO **berria sortzen ari
subdukzio eremuetan suntsitzen
- beste fenomeno azaldu : bolkanismo,orogenia,kontinenteen higidura,sismikotasuna

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7
Q

DINAMIKaren zegatia

A
  1. mantuko** konbekzio korronte ( gradiente** geotermiko)
  2. dortsaletan hondoratutako plaka arrastatutako lotutako plaka = dortsala etengabe zabaldu & aktibo
  3. kanpo nukleo konbekzio korronte BARNE NUKLEOKO BEROA kanporatu
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8
Q

GEOSFERAREN BEROA MANTENDU

A
  1. sorrerako hondar beroa
  2. mantuko material erradiaktiboen deskonposizio exotermikoa
  3. kanpo nukleoko burdina kristalizatzean beroa askatu - (burdina barne nukleora prezipitatu)
  4. konbek korronteek marruskadura = beroa askatu
  5. GRABITATEA = P = BEROA ASKATU
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9
Q

ertz dibergente

A

2 plaka banatu = dortsal ozeanikoa
1. materiala mantutik kanporatu ( pitzadura jarduera bolkanikoa)
2. basaltoa sortu

eraikitzaile

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10
Q

ebakidurazko ertzak

A

plakak elkar irristatu= falda eraldatzaile
1. jarudera sismiko
2. bolkanismo
3. harrien deformazio + konpresioa

pasiboak

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11
Q

ertz konbergente

A

talka = SUBDUKZIO EREMU
1. plaka dentsoena hondoratu
2. sismikotasuna eta bolkanismoa

suntsitzaile

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12
Q

ozeaniko-ozeaniko

A
  1. gaineko plakan ARKU IRLAK
  2. lurrikara/ tsunami intentsitate ertain/handiko
  3. hobi ozeaniko sakonak
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13
Q

ozeaniko-kontinental

A
  1. mendikate perikontinental (ANDES)
  2. lurrikara intentso
  3. hobi sedimentario PERIKONTINENTAL
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14
Q

kontinental-kontinental

A
  1. mendikate barnekontinental (himalaya)
  2. bolkanismorik ez
    3.** LURRIKARA** SUPER FUERTES
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15
Q

luma termiko

A

behe mantuaren oinarritik igotzen den MATERIAL BEROKO korrontea

materialak kanpo nuk kontaktuan = d - = flotatu = mantua zeharkatu

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16
Q

PUNTU BEROA

A

luma termikoa litosferaren oinarrira heldu
berotu = jarduera bolkanikoko eremua