volcanic pipe sentence in Hindi
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- At the margins of the volcanic pipe the lamproite is mixed with a volcanic breccia containing shattered wall rock fragments mixed and milled by the eruption.
- It is the remains of a volcanic pipe which cut through the surrounding sedimentary rock, before cooling to form very hard dolerite, a coarser-grained equivalent of basalt.
- During eruption these pipes are open to the surface, resulting in open circulation; many xenoliths of surface rock and even wood and fossils are found in volcanic pipes.
- Around 90-120 million years ago, a swarm of volcanic pipes, centred on Kimberley to the east, brought diamond-bearing kimberlite to a higher surface formed of Karoo Sequence sediments.
- As the rough diamond travels up from the earth's crust through volcanic pipes it comes under extreme stresses and pressures, and during this travel tiny fractures can form inside the diamond.
- Johann Wolfgang Goethe recognised the volcanic origin of these stone fields : the basalt of the former volcanic pipe crumbled as a result of erosion to form the blockfields visible today that are a typical indicator of collapsed volcano structures.
- Since the Permian, erosion has removed the volcanic peaks and indeed most of the lava layer and laid bare the magma chambers and volcanic pipes deep below, allowing scientist a rare view of what goes on beneath a rift valley.
- The Argyle diamond mine is also notable for being the first successful commercial diamond mine exploiting a volcanic pipe of lamproite, rather than the more usual kimberlite pipe; much earlier attempts to mine diamonds from Murowa Diamond Mine in Zimbabwe.
- A volcanic pipe containing diamonds is known as a " primary source " of diamonds . " Secondary sources " of diamonds include all areas where a significant number of diamonds have been eroded out of their kimberlite or lamproite alluvial deposits and deposits along existing and ancient shorelines, where loose diamonds tend to accumulate because of their size and density.
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