005-Hawaiian Island Geology

005-Hawaiian Island Geology - seagrass Darwins Theory of...

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Over 100 volcanoes in a volcanic island arc system Big Island Meiji (3000 m deep)
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Hawaiian Islands Hawaiian Islands Hawaii Oahu Kauai Lanai Maui Molokai Niihau
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Bathymetric Profile of Hawaiian Emperor Chain
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Hawaii (youngest) Maui Oahu Kauai (oldest) Pacific Plate 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.
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Much of the Hawaiian island arc is underwater and extends toward Midway Moves in a northwesterly direction
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Older islands erode and subside
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Picture 2 Aging islands and coral: Drilling and removing core sample C 14 dating
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Barrier Reef- separated from land by a lagoon Fringing Reef- boarders coastline closely Island subsides Atoll- coral ring with central lagoon lagoon is a shallow area with a sandy floor, patch reefs, and patches of
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Unformatted text preview: seagrass Darwins Theory of Coral Atoll Formation: Subsidence Theory Fringing Reef- Tahiti Fringing Reef Reef Flat Reef Front Shoreline Barrier Reef Profile reef slope reef front outer reef flat lagoon patch reef island inner reef flat Australia- Great Barrier Reef Kaneohe Bay Barrier Reef Fringing Reef Patch Reef Reef Flat of a barrier reef Reef Flat of a Barrier Reef Reef Flat Coral Island (Cay or Motu) Reef Front Lagoon Open Ocean Cross Section of an Atoll Atoll Belize- Blue Hole Kure Atoll (28 25' N - 178 20' W) Midway Atoll Pearl & Hermes Atoll Inquiry 1. The oldest seamount in the Hawaiian Emperor Chain is _____? 2. What direction are our islands moving? 3. What seamount will be the newest Hawaiian Island? 4. Key features of a barrier reef are_____? 5. When an atoll subsides it often forms a _____?...
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005-Hawaiian Island Geology - seagrass Darwins Theory of...

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