1. ???(Mid-ocean Ridges)

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• 1. ??????????
• 2. ????????????
• ??
• ?????
• 3. ?-??????????
• 4. ??????????

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1. ???(Mid-ocean Ridges) 2. ????(Intracontinental
Rifts) 3. ??(Island Arcs) 4. ?????? (Active
Continental Margins) 5. ????(Back-arc basins)

• 6. ?????(Ocean Island basalts)
• 7. ??????????
• (Miscellaneous Intra-Continental Activity)
• ????(kimberlites) ,
• ???-????????,
• ???(carbonatites) ,
• ???( anorthosites)...

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• ??????????-?????
• ?????????????

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• ??
• ?????

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Ocean-ocean ? ??Island Arc (IA) Ocean-continent
? ???Continental Arc or ??????Active Continental
Margin (ACM)
??????????????????
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Structure of an Island Arc
?????????? HFU heat flow unit (4.2 x 10-6
joules/cm2/sec)
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1????????
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(No Transcript)
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???????Island Arc Petrogenesis

• ?????????
• ????
• ??????????????????????
• ???????????????,?????????????????,???????

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2?????????

• ????????????????????,?????????????????????????????
  ,???????????,?????????????K2O???????????????,????
  ???
• ?????????????,???-????,???-?????,??????,??????????
  ????
• ????????????????? ??????????
• ????????????????? ?????????????????
• ??????????????????,?????????,????????????

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???????Continental Arc Magmatism
AFM and K2O vs. SiO2 diagrams (including Hi-K,
Med.-K and Low-K types of Gill, 1981
(a)northern, (b)central and (c)southern
volcanic zones of the Andes. Open circles
in the NVZ and SVZ are alkaline rocks.
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(?) ?-??????????
1????????????????? ?????????????????????????
?????????????????
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(?) ?-??????????

• 2??????????(??)?????
• ?-?????,??????????????????????????

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(?) ?-??????????

• 3????????????????
• ???????????????,???????????????,????????
  ?????????????

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(?)??????????

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• ????????
• ???????????
• ?????
• ??????????
• ??????????
• ????-????????
• ?????
• A????

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1??????(Ocean Intraplate Volcanism)

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• ???????

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?????????(OIB)
???????? ???????
-???????(OIT) ??????? -???????( OIA)
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??Evolution in the Series
Tholeiitic, alkaline, and highly alkaline
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3????????(CFB) Continental Flood Basalts

• ?????
• Large Igneous Provinces
• (LIPs)
• ?????
• Some rifts
• ???????
• Continental flood basalts
• (CFBs)

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CFB????? Tectonic Setting of CFBs

• ????
• ?????????????

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