Sources of Beach Sand Beach sands are derived from the breakdown of rocks (or reefs, etc.) in the surrounding region. THEREFORE, whatever is nearby will.

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Presentation transcript:

Sources of Beach Sand Beach sands are derived from the breakdown of rocks (or reefs, etc.) in the surrounding region. THEREFORE, whatever is nearby will create what is on the beach OR, what is in the beach sand MUST also be in the rocks nearby

Sources of Beach Sand In California lots of rocks = lots of broken rock bits = lots of bits of minerals = lots of mineral beach sands Near Coral Reefs Lots of organic material = lots of broken bits of organic material + closer to beach than other eroded particles = beach full of coral reef fragments

Heavy Mineral Sand Some minerals heavier than others Magnetite, pyrite, galena Takes energy to move particles Larger particles = more energy

Oolitic Sands Ooites (aka ooids) Formation: CaCO 3 precipitates out of water Forms a CaCO 3 (lime) mud on bottom of the sea floor Pieces of mud get ripped up by wave action Ripped up pieces get rolled into balls by the gentle waves Eventually harden into ooites

Beach sands Location: Cabo, Baja Mexico Composition: Shells Source: lots of shells (kelp bed, tide pool) just offshore.

Beach sands Location: Waianapanapa, Maui Composition: Basalt Source: Erosion of basaltic lava flows which comprise the island of Maui

Basalt = Black Sand Beaches Black Sand Beach, Hawai’i Basalt Waianapanapa, Maui

Green Sand Olivine common in basalt Crystals can easily fall out during weathering Creates a beach of green sand

Beach sands Location: Guam Composition: Olivine Source: Erosion of basaltic lava flows containing lots olivine

Olivine = Green Sand Beaches Green Sand Beach Papakolea, Hawai’i Olivine Guam

Beach sands Location: Huahini, Tahiti Composition: Coral Source: Breakdown of coral reefs just offshore

Beach sands Location: Ventura, California Composition: Minerals Source: Breakdown of rocks in surrounding area

Minerals = “Tan” Sand Beaches Cabrillo Beach San Pedro, CA S. Leyva 2005 Minerals (quartz, feldspar, hornblend) Ventura, California