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| The geologic landscape of Joshua Tree has long fascinated visitors to
this desert. How did the rocks take on such fantastic shapes? What forces
sculpted them? |
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| Geologists believe the face of our modern landscape was born more than
100 million years ago. Molten liquid, heated by the continuous movement
of Earth’s crust, oozed upward and cooled while still below the surface.
These plutonic intrusions are a granitic rock called monzogranite. |
| The monzogranite developed a system of rectangular joints. One set, oriented
roughly horizontally, resulted from the removal—by erosion—of
the miles of overlying rock, called gniess (pronounced “nice”).
Another set of joints is oriented vertically, roughly paralleling the contact
of the monzogranite with its surrounding rocks. The third set is also vertical
but cuts the second set at high angles. The resulting system of joints tended
to develop rectangular blocks. (figure 1) Good examples
of the joint system may be seen at Jumbo Rocks, Wonderland of Rocks, and
Split Rock. |
| As ground water percolated down through the monzogranite’s joint
fractures, it began to transform some hard mineral grains along its path
into soft clay, while it loosened and freed grains resistant to solution.
Rectangular stones slowly weathered to spheres of hard rock surrounded by
soft clay containing loose mineral grains. Imagine holding an ice cube under
the faucet. The cube rounds away at the corners first, because that is the
part most exposed to the force of the water. A similar thing happened here
but over millions of years, on a grand scale, and during a much wetter climate.
(figure 2) |
| After the arrival of the arid climate of recent times, flash floods began
washing away the protective ground surface. As they were exposed, the huge
eroded boulders settled one on top of another, creating those impressive
rock piles we see today. (figure 3) |
| Visitors also wonder about the “broken terrace walls” laced
throughout the boulders. These are naturally occurring formations called
dikes. Younger than the surrounding monzogranite, dikes were formed when
molten rock was pushed into existing joint fractures. Light-colored aplite,
pegmatite, and andesite dikes formed as a mixture of quartz and potassium
minerals cooled in these tight spaces. Suggesting the work of a stonemason,
they broke into uniform blocks when they were exposed to the surface. |
| Of the dynamic processes that erode rock material, water, even in arid
environments, is the most important. Wind action is also important, but
the long-range effects of wind are small compared to the action of water.
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| The erosion and weathering processes operating in the arid
conditions of the present are only partially responsible for the spectacular
sculpturing of the rocks. The present landscape is essentially a collection
of relict features inherited from earlier times of higher rainfall and
lower
temperatures. |
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last modified: 04/01/02
web editor: Sandra kaye |
