Lord Howe Island basaltic cumulate3D Model
Lord Howe Island basaltic cumulate
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More model informationThis broken cobble of cumulate basalt was found on a ‘beach’ of surf-rounded cobbles and boulders at Lord Howe Island off the east coast of Australia. Lord Howe is an extinct hot spot volcano (7 million years old) that is part of a meridional chain of seamounts in the Tasman Sea. The southern end of the chain is still an active seamount to the northeast of Tasmania. The volcano is significantly eroded. The boulder beach has various types of basalts and rocks with a similar cumulate appearance to this one. The sand in between the boulders in exceptionally rich in olivine and augite, the two dominant phenocryst phases in this specimen. The basalts themselves vary from alkali picrites through to olivine tholeiites.
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