sediment analysis lab part ii hawaiian mystery sands
Post on 20-Dec-2015
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Sediment Analysis labPart II
Hawaiian Mystery Sands
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Use the following info to
• Help you identify from which of the following 6 beaches the “mystery” samples came
• Help you explain what characteristics (composition, grain-size, etc.) of the mystery samples helped you identify its beach.
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Beach 1: Kaihalulu Beach
Photo: Kevin Coates, Hana Kayak Tours
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The distinctive red sand of Kaihalulu Beach (near Hana on Maui’s eastern end)
comes from the high iron oxide (rust) content in the volcanic cinders of nearby
Ka‘uiki Hill.
Image by Dennis Kunkel courtesy of Bishop Museum
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Beach 2: Kailua Beach
Photo: David Kemble
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The fine white sand of Kailua Beach on the windward coast of O‘ahu is made from broken down bits of coral reef and marine
shells and skeletons. In the shelter of a broad fringing reef, this beach’s gentle
waves make it a favorite for family recreation.
Image by Dennis Kunkel courtesy of Bishop Museum
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Beach 3: Kalapana Beach
Photo: John Bortniak,National Oceanic & Atmospheric Administration,
Dept. of Commerce
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Broken down bits of lava rock form the famous black sand beaches on the southeast coast of the
island of Hawai‘i. As hot lava from Kilauea and Mauna Loa pours into cool ocean water, steam
explosions blast the lava apart, forming fine grains of basalt rock sand.
Image by Dennis Kunkel courtesy of Bishop Museum
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Beach 4: Papakulea Beach
Photo: Richard A. Cooke III
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The famous green sand of Papakulea Beach near the South Point of the island of Hawai‘i comes
from olivine, a common mineral found in volcanic rocks. This side of the island is too young to have
developed coral reefs, so recent lava flows are the only source of sand.
Image by Dennis Kunkel courtesy of Bishop Museum
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Beach 5: Sandy Beach
Photo: David Kemble
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Bits of broken reef combined with eroded lava rock from nearby Koko Crater form the sand on Sandy Beach, a popular bodysurfing spot on the southeastern tip of O‘ahu. The relentless waves and strong current constantly break down new material. They carry away the fine sand grains,
leaving coarse sand.
Image by Dennis Kunkel courtesy of Bishop Museum
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Beach 6: Sunset Beach
Photo: David Kemble
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A wide variety of materials and organisms dislodged from the surrounding reefs form the sand at Sunset Beach on the North Shore of O‘ahu. This calm summer beach transforms
into a surfing beach in the winter, when huge waves pulverize the reef and its attached
animals.
Image by Dennis Kunkel courtesy of Bishop Museum