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MauiNui - Geology of Maui Nui Maui Molokai Lanai and...

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Geology of Maui Nui: Maui, Moloka‘i, Lana‘i, and Kaho‘olawe
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Maui Moloka‘i Lāna‘i Kaho‘olawe
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Maui Nui The four islands of Maui, Moloka‘i, Lana‘i, and Kaho‘olawe formed a single landmass in the past called Maui Nui (Greater Maui) formed of 6 or 7 volcanoes Around 2 million years ago, volcanoes on all of these islands as well as the Ko‘olau on O‘ahu were in their shield stage, which means there were 4 to 5 active shield volcanoes at the same time
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Maui Nui today submarine rift zones submarine landslides Penguin Bank
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Maui Nui in the early Pleistocene (1.2 Ma)
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Maui Nui today
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Island of Maui Formed of two volcanoes: West Maui Volcano, ~1.97 to 0.39 Ma has rocks from all three subaerial eruptive phases: shield, postshield alkalic cap, and rejuvenation East Maui Volcano, 1.1 Ma to present has rocks from the late shield (rare) and postsheild alkalic cap (most of the volcano’s modern surface) is still in the postsheild alkalic cap stage includes Haleakala - an erosional feature modified by later eruptions
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West Maui Volcano East Maui Volcano Haleakalā
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West Maui Volcano Caldera is roughly outlined by ‘Iao Valley Two sets of rift zones (four total) not very well defined, dikes go in many directions both active in shield and postshield stages change in orientation due to growth of East Maui Volcano?
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West Maui Volcano
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West Maui Volcano
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West Maui Volcanic Rocks Shield Stage Wailuku Member , ~1.97 to 1.31 Ma low silica tholeiitic basalts; thin pahoehoe and a‘ā flows but toward the end of the shield stage become smore silica-rich and more alkaline, and lava flows become thicker Postshield Alkalic Cap Stage Honolua Member , ~1.20 Ma 40-60 separate eruptions with 1000 to 10,000 years between eruptions mostly benmorites and trachytes, more silica-rich than hawaiite
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