Keyword: zircon

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  • 3M22 Zircon Hypersonic Missile in Development Testing for Russian Navy Kirov-class Cruiser

    02/19/2016 1:58:37 AM PST · by sukhoi-30mki · 15 replies
    Navy Recognition ^ | 19 February 2016
    Russian cutting-edge hypersonic missile 3M22 of the 3K22 Zircon system is in the development trials. The Project 11442 (NATO reporting name: Kirov-class) Pyotr Veliky nuclear-powered missile cruiser will carry the type following its upgrade, a shipbuilding industry source told TASS on Friday. According to rumors, the Indo-Russian BrahMos II hypersonic cruise missile (pictured here at Defexpo 2014) is the export variant of the Russian 3M22 Zircon missile. "The Pyotr Veliky cruiser will start its repairs in the third or fourth quarter of 2019. Its repairs and upgrade are planned to be complete in late 2022, with the ship to be...
  • Volcanic Evidence Opens New Maya Mystery

    01/05/2016 12:43:59 AM PST · by SunkenCiv · 23 replies
    LiveScience ^ | May 30, 2014 | Becky Oskin
    Potters at Maya cities on the Caribbean side of Central America fused volcanic ash with local limestone to form household and ceremonial pottery, because the ash made their ceramics easier to fire. The distinctive recipe was a hallmark of the Late Classic Period from A.D. 600 to 900, Ford said. With thousands of people living in cities such as El Pilar and Tikal, the Mayan potters burned through several tons of volcanic ash every year, Ford has estimated. But no one can figure out where the ash came from. The mystery begins with the fact that there just aren't any...
  • Crystal is 'oldest scrap of Earth crust'

    02/24/2014 7:56:24 AM PST · by JoeProBono · 50 replies
    bbc ^ | 24 February 2014
    A tiny 4.4-billion-year-old crystal has been confirmed as the oldest fragment of Earth's crust. The zircon was found in sandstone in the Jack Hills region of Western Australia. Scientists dated the crystal by studying its uranium and lead atoms. The former decays into the latter very slowly over time and can be used like a clock. The finding has been reported in the journal Nature Geoscience. Its implication is that Earth had formed a solid crust much sooner after its formation 4.6 billion years ago than was previously thought, and very quickly following the great collision with a Mars-sized body...
  • Whoops! Earth's Oldest 'Diamonds' Actually Polishing Grit

    01/03/2014 2:26:38 PM PST · by aimhigh · 14 replies
    LiveScience ^ | 1/3/2014 | Becky Oskin
    Evidence of Earth's first continents — 4.3-billion-year-old "diamonds" — are actually just fragments of polishing grit, a new study finds. In 2007, an international team first reported discovering the tiny gems, which hid in pockets inside zircon crystals from Western Australia's Jack Hills, in the journal Nature. But it turns out that the gems weren't actually diamonds, but polishing paste, smushed into hairs'-width cracks when the zircons were prepared for laboratory tests, according to a study published online in the Feb. 1, 2014, edition of the journal Earth and Planetary Science Letters.
  • Geochemical 'Fingerprints' Leave Evidence That Megafloods Eroded Steep Gorge

    07/28/2013 3:01:55 AM PDT · by SunkenCiv · 15 replies
    Science Daily ^ | July 22, 2013 | University of Washington
    The Yarlung-Tsangpo River in southern Asia drops rapidly through the Himalaya Mountains on its way to the Bay of Bengal, losing about 7,000 feet of elevation through the precipitously steep Tsangpo Gorge. For the first time, scientists have direct geochemical evidence that the 150-mile long gorge, possibly the world's deepest, was the conduit by which megafloods from glacial lakes, perhaps half the volume of Lake Erie, drained suddenly and catastrophically through the Himalayas when their ice dams failed at times during the last 2 million years... In this case, the water moved rapidly through bedrock gorge, carving away the base...
  • Diamonds Tell Story Of Earth's Beginning

    08/22/2007 6:48:58 PM PDT · by blam · 15 replies · 724+ views
    The Telegraph (UK) ^ | 8-22-2007 | Roger Highfield
    Diamonds tell story of Earth's beginning By Roger Highfield, Science Editor Last Updated: 12:01am BST 22/08/2007 Diamonds really are forever, according to a study that has found tiny examples of the gems that date from near the birth of the Earth. Tiny diamonds discovered inside crystals of zircon Over four billion years old, the diamonds are the oldest identified fragments of the Earth’s crust and were discovered in the Jack Hills region of Western Australia, suggesting they were created only 300 million years after the planet itself was born from the dust and debris encircling our Sun some 4.5 billion...
  • Simple Life Form May Have Existed 700 Million Years Earlier Than Previously Thought

    07/11/2008 5:26:55 PM PDT · by SunkenCiv · 18 replies · 76+ views
    Science Daily ^ | July 8, 2008 | Curtin University
    The accepted timeframe for the beginnings of life on Earth is now being questioned by a Curtin University of Technology led team of scientists, after finding a key indicator to the earliest life forms in diamonds from Jack Hills in Western Australia... The Curtin led team's discovery of very high concentrations of carbon 12, or "light carbon" within these crystals is remarkable as it is a feature usually associated with organic life... Evidence for ancient life stretches back in time to at least 3.5 billion years ago, in the form of single-celled organisms that did not require oxygen. The discovery...