HawaiiGeo - Geology of the Big Island of Hawaii Island of...

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Geology of the Big Island of Hawai‘i
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Island of Hawai‘i
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The Big Island of Hawai‘i Youngest Hawaiian island Five volcanoes above sea level: Kohala, Mauna Kea, Hualalai, Mauna Loa, and Kilauea Two submarine volcanoes: Mahukona and Lo ihi Submarine rift zones Giant submarine landslides Pahala Ash a layer of weathered ash found all over the island may come from more than one volcano Mauna Kea in the north Kilauea in the south has been used to try to correlate age of Big Island volcanoes
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submarine rift zones Lō‘ihi Seamount submarine land slides submarine land slides submarine rift zone
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Kohala Mauna Kea Kīlauea Mauna Loa Hualālai
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distribution and thickness of Pāhala Ash
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Kohala Volcano Oldest of the Big Island volcanoes A single set of rift zones (two total) N o exposed caldera--probably buried by postshield lavas Shield Stage rocks: Pololo Member , 500 to 300 k.y.a. (k.y.a. = thousand years ago) tholeiitic basalt, exposed in valley walls alkalic basalts appear toward end of shield stage Postshield Stage rocks: Hawi Member , 260 to 60 k.y.a.
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This note was uploaded on 04/19/2011 for the course GG 103 taught by Professor Herrero-bervera during the Summer '10 term at University of Hawaii, Manoa.

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HawaiiGeo - Geology of the Big Island of Hawaii Island of...

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