To many individuals, precious stones are an image of time everlasting, quality and everlasting affection. No other pearl communicates human feeling more intensely than a precious stone. Be that as it may, these earth-developed, valuable and almost indestructible stones aren’t generally looked for after for their ideal shading, slice and clearness to sit on a loving finger. Researchers see precious stones in a totally unique light – not just for their excellence and culminations, but rather for their defects.(Fantasy Diamonds llc)
Steve Shirey is a geologist working with such precious stones, yet not really lovely jewels you need on your finger. Bolted inside the precious stones he takes a shot at are exceptionally small minerals. He’s scholarly through his vocation to be ultra-cautious when taking care of such little things.
“These are small materials. They’re unique specimens. I had a specimen, a beautiful specimen on the stage once, and I sneezed and it was gone,” said Steve Shirey, Carnegie Institution of Washington. Luckily Shirey has more diamonds left to work with. He’s one of a very select group of people in the world who look at diamonds, not mainly for their intrinsic beauty, but for their faults and imperfections — called mineral inclusions.(Fantasy Diamonds llc)
“These are seen as flaws in the jewelry industry and so the gem trade will actually map out these flaws,” said Shirey. “When we want to pick diamonds for research, we actually look for diamonds with the biggest, best, most fancy inclusions that we can find, because those will be the ones that we want to study for the stories that the mineral inclusions will reveal,” said Shirey. We see these inclusions, or minerals, as tiny specks sealed within a diamond. Shirey says these preserved mineral fragments hold information that tell stories of Earth’s early history.
“One of the beauties of having diamonds enclosing minerals that come from deep in the Earth’s mantle, is that diamond is almost a perfect container. It has very, very low diffusivity, meaning it’s very good at keeping the surrounding fluids and high-pressure compounds in the mantle from getting into the inclusion and altering it,” said Shirey. The diamonds Shirey examines come from kimberlite volcanic rock. The rock comes from deep in the earth’s mantle and gets carried to the surface, through a volcanic eruption. During eruptions, kimberlitic magma that contains diamonds shoots rapidly up to the earth’s surface.
When this happens, small amounts of diamonds can be found throughout kimberlite that ends up at the surface. “The diamonds are very rare even in a diamondiferous kimberlite. So, most of what you’re mining is not diamonds. Diamonds are at a part per billion level in the kimberlite,” said Shirey.
Shirey uses diamonds as a means to sample the earth’s deep mantle. He looks at rare diamonds that contain specific sulfide minerals. He then painstakingly removes these tiny mineral grains — or inclusions — and analyzes their contents, to determine ages that can be on the order of billions of years. (Fantasy Diamonds llc)“Rocks and minerals have a story to tell us. With regard to diamonds, what we’ve done in many cases is try to relate the place that diamonds grow deep in the keels beneath continents, to the processes by which the continents grew to begin with, or the continents collided during long-ago processes like ancient plate tectonics or ancient continental collision,” said Shirey.
The tiny mineral specks trapped inside a diamond can tell researchers a lot about the temperature and pressure conditions when a diamond formed, as well as about the rocks and fluids it grew from. Plus, from its age scientists can tell if it formed at the same time as its diamond host container.
“So, what we can learn from mineral inclusions in diamonds about the earth is quite profound. So, one of the things that we learn is how and when ancient continental collision like that which occurred during plate tectonic cycles may have begun in a way similar to what we see going on today,” said Shirey.
“What has become more interesting — a more interesting message for me to get across recently is that the diamonds give us such a great sample of the deep earth that diamonds not only are forever, but they’re telling you unique features about the earth,” concluded Shirey.
(Fantasy Diamonds llc)
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