1 / 23

Hawaiian Island Geology

Hawaiian Island Geology. Over 100 volcanoes in a volcanic island arc system. Meiji (3000 m deep). Big Island. Hawaiian Islands. Niihau. Kauai. Oahu. Molokai. Lanai. Maui. Hawaii. Bathymetric Profile of Hawaiian Emperor Chain.

haru
Télécharger la présentation

Hawaiian Island Geology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hawaiian Island Geology

  2. Over 100 volcanoes in a volcanic island arc system Meiji (3000 m deep) Big Island

  3. Hawaiian Islands Niihau Kauai Oahu Molokai Lanai Maui Hawaii

  4. Bathymetric Profile of Hawaiian Emperor Chain

  5. J. Tuzo Wilson (1963), a Canadian geophysicist ,came up the "hotspot" theory. volcanoes of the Hawaiian chain should get progressively older and become more eroded the farther they travel beyond the hotspot. Pacific Plate Kauai (oldest) Oahu Maui Hawaii (youngest)

  6. Age of Hawaiian Islands

  7. Movement of Hawaiian Islands Moves in a northwesterly direction Much of the Hawaiian island arc is underwater and extends toward Midway

  8. WE’VE GOT HOT SPOTS ALL OVER THE PLACE Other examples of hot spots include: Cape Verde (off the coast of Senegal), Galapagos Islands (off the coast of Equator), Society Islands (French Polynesia), Tristan da Cunha (southern Atlantic), Yellowstone, Ethiopia Plateau, Lord How (near Sydney), Iceland, and many more.

  9. Movement away from hotspot Older islands erode and subside

  10. Aging islands and coral: • Drilling and removing core sample • C14 dating

  11. Darwin’s Theory of Coral Atoll Formation: Subsidence Theory Fringing Reef- boarders coastline closely Island subsides Barrier Reef- separated from land by a lagoon Atoll- coral ring with central lagoon lagoon is a shallow area with a sandy floor, patch reefs, and patches of seagrass

  12. Fringing Reef- Tahiti

  13. Fringing Reef Shoreline Reef Flat Reef Front

  14. Barrier Reef Profile

  15. Australia- Great Barrier Reef

  16. Kaneohe Bay Barrier Reef Patch Reef Fringing Reef

  17. Reef Flat of a barrier reef Lagoon Reef Flat of a Barrier Reef Coral Island (Cay or Motu) Reef Flat Reef Front Open Ocean

  18. Cross Section of an Atoll

  19. Belize- Blue Hole Atoll

  20. Midway Atoll Kure Atoll (28° 25' N - 178° 20' W) Pearl & Hermes Atoll

  21. Inquiry • The oldest seamount in the Hawaiian Emperor Chain is _____? • What direction are our islands moving? • What seamount will be the newest Hawaiian Island? • Key features of a barrier reef are_____? • When an atoll subsides it often forms a _____?

More Related