Quick Answer: Why are diamonds older than kimberlite?

What is the relationship between diamonds and kimberlite?

study showed definitively that the diamonds had no genetic relationship to the kimberlite. This basic age relationship holds for all other diamondiferous kimberlites. Kimberlite eruptions, then, are just the way that diamonds make their way from depth in the mantle to Earth’s surface.

Do diamonds come from kimberlite?

Kimberlite is an igneous rock, which sometimes contains diamonds. … Kimberlite pipes are the most important source of mined diamonds today. The consensus on kimberlites is that they are formed deep within the mantle.

Do all kimberlites contain diamonds?

Kimberlite pipes: Where they are located

Kimberlite pipes were first found near Kimberley in South Africa, but since then they have been found on most continents. Of course, as has been noted, not all kimberlite pipes are created equal and only a small percentage of them contain diamonds.

How old is a natural diamond?

Most natural diamonds have ages between 1 billion and 3.5 billion years. Most were formed at depths between 150 and 250 kilometres (93 and 155 mi) in the Earth’s mantle, although a few have come from as deep as 800 kilometres (500 mi).

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Are diamonds magmatic?

Diamonds are brought to the surface from the mantle in a rare type of magma called kimberlite and erupted at a rare type of volcanic vent called a diatreme or pipe.

What rock is diamond found in?

Diamond is only formed at high pressures. It is found in kimberlite, an ultrabasic volcanic rock formed very deep in the Earth’s crust. The extreme pressures needed to form diamonds are only reached at depths greater than 150km.

What do diamonds in kimberlite look like?

kimberlite, also called blue ground, a dark-coloured, heavy, often altered and brecciated (fragmented), intrusive igneous rock that contains diamonds in its rock matrix. It has a porphyritic texture, with large, often rounded crystals (phenocrysts) surrounded by a fine-grained matrix (groundmass).

How can you tell if a rock is a diamond?

The only hardness test that will identify a diamond is scratching corundum. Corundum, which includes all rubys and sapphires, is 9 on the hardiness scale. If your suspected diamond crystal can scratch corundum, then there is a good chance that you found a diamond. But NO OTHER HARDNESS TEST will identify a diamond.

Why are diamonds found in kimberlite pipes?

Diamond-bearing kimberlite pipes are only found in ancient areas of the continents. But diamonds have also been found far from the pipes. This is because volcanic rock erodes and is washed away over time. Rivers, streams and glaciers can carry diamonds far from the original volcanoes.

How do I know if I found a raw diamond?

Tips for identifying a raw diamond

  1. Fill a clear and normal-sized drinking glass and fill it with water to a 3/4 level.
  2. Then drop the stone you have into the glass.
  3. If it sinks, the stone is a genuine raw diamond. But if it floats, it’s fake.
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Can you find diamond in quartz?

Hardness Test

Diamonds can scratch every other mineral, but only diamonds can scratch diamonds. Quartz, the most likely mineral to be mistaken for diamonds in uncut rough form, ranks 7 on the Mohs Hardness Scale. … Since corundum scratches itself and everything softer, any mineral that corundum won’t scratch is diamond.

How deep are kimberlite pipes?

The general consensus is that kimberlites are formed deep within the mantle, at depths between 150 and 450 kilometers, from anomalously enriched exotic mantle compositions. They are erupted rapidly and violently, often with the release of considerable amounts of carbon dioxide (CO2) and volatile components.

Can you date diamonds?

The way they date diamonds is typically looking at inclusions of other minerals in the diamond that can be radioactively dated. The diamonds themselves can’t be dated.

How old are the youngest diamonds?

The youngest diamond is 900 million years old. The oldest known diamonds are more than 3 billion years old, which is older than many stars in the sky.

What is diamond birthday?

A diamond jubilee celebrates the 60th anniversary of a significant event related to a person (e.g. accession to the throne, wedding, etc.) or the 60th anniversary of an institution’s founding. The term is also used for 75th anniversaries, although the human lifespan makes this usage more common for institutions.