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if the tone/saturation numbers were listed as "6/5"...

this would indicate the gem has "Medium-dark" tone and "Strong" saturation of color...

There is, world-wide, an ash layer at the boundary which has been independently dated by several different radiometric techniques to approximately 65 million years (3).

However, the cause of this mass extinction was keenly sought but not known until Alvarez et al suggested that it was caused by the impact of a huge asteroid (4) (5) .

Buffon's Iron Sphere Experiments- On the basis of iron sphere cooling experiments, Frenchman Georges de Buffon estimated that the Earth would have needed 75,000 years to cool to its present temperature.

The quantitative approach is admirable, but Buffon's assumptions are flawed. Silicate minerals have lower heat conductivity than steels and are better insulators leading to slower cooling rates.

Because of their uranium and thorium content, some zircons undergo metamictization.

Connected to internal radiation damage, these processes partially disrupt the crystal structure and partly explain the highly variable properties of zircon.

Throughout the world, there is a sudden extinction of a large number of taxa, including the dinosaurs, at the geological boundary known as the K-T (Cretaceous – Tertiary) boundary.

The natural color of zircon varies between colorless, yellow-golden, red, brown, blue, and green.

Colorless specimens that show gem quality are a popular substitute for diamond and are also known as "Matura diamond".

李秋立,研究员,博士生导师。1977年出生于河北河间。1998年毕业于西北大学地质系,2003年于中国科学技术大学获博士学位。长期从事微区地质年代学研究,在离子探针上研发了多种副矿物微区原位U-Pb年龄测试方法,为解决超碱性岩类、碳酸岩类、陨石、碎屑沉积岩、中低温变质岩、矿床等定年难题提供了有效定年手段。在国内外学术刊物上共发表100余篇研究论文,其中82篇被SCI 收录,SCI 引用1500多次。获得2008年安徽科学技术奖一等奖(排名第四)、2010年国家自然科学二等奖(排名第五年),2012年首届国家优秀青年科学基金,2014年中国矿物岩石地球化学学会“侯德封奖”。学历:1. 超高压变质岩中多期多硅白云母的年代学与矿物学 (国家自然科学基金,2005.1-2007.12,批准号:40403008)2. 华北克拉通显生宙期间岩石圈地幔的时代 (国家自然科学基金,2007.1-2010.12,批准号:40634019)3. 扬子克拉通钾镁煌斑岩和玄武岩研究对岩石圈厚度和性质的制约(国家自然科学基金,2010.1-2012.12,批准号:40973044)4. 离子探针分析基体效应研究-以橄榄石Li同位素为例 (国家自然科学基金,2012.1-2015.12, 批准号:41173009)5.

Chronological Analysis of the Scriptures- Literal interpretation of the scriptures led some people to conclude that the Earth was created approximately 6,000 years old.

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