Dike dating for

20-Mar-2020 03:25

The Independence dike swarm in eastern California, more than 250 km long, extends from the eastern Sierra Nevada and Inyo Mountains through the Argus Range, Alabama Hills, and Spangler Hills to the Garlock fault, where it is offset 64 km before continuing into the Mojave Desert.The dike swarm includes a wide variety of rock types, from lamprophyre to granite porphyry belonging to a calc-alkalic suite.

The magma crystallizes underground and becomes a dike, which is a plutonic or intrusive rock.

The dikes sometimes stand out in bold relief such as this one named the Big Wall, shown here at the base of West Spanish Peak.

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