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Solving the Mystery of Hawaiian Sands: A Guide to Beach Sediment Analysis

Dive into the intriguing world of Hawaiian beach sands in this comprehensive analysis. This guide aids in identifying six unique beaches by examining key sediment characteristics like composition and grain size. Discover the distinctive red sands of Kaihalulu, the fine white grains of Kailua, the black sands of Kalapana, the green sands of Papakulea, the mixed sediments of Sandy Beach, and the diverse materials at Sunset Beach. Each beach tells a story of volcanic activity, marine life, and geological processes. Uncover the secrets hidden within these enchanting sands!

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Solving the Mystery of Hawaiian Sands: A Guide to Beach Sediment Analysis

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  1. Sediment Analysis labPart II Hawaiian Mystery Sands

  2. 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.

  3. Beach 1: Kaihalulu Beach

  4. 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.

  5. Beach 2: Kailua Beach

  6. The fine white sand of Kailua Beach on the windward coast of O‘ahuis 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.

  7. Beach 3: Kalapana Beach

  8. 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.

  9. Beach 4: Papakulea Beach

  10. 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.

  11. Beach 5: Sandy Beach

  12. 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.

  13. Beach 6: Sunset Beach

  14. 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.

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