探测大量的托巴岩的积累历史
1Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095-1567, USA. jvazquez@ess.ucla.edu
Science (New York, N.Y.)
|August 18, 2004
概括
最年轻的托巴塔夫喷发之前有15万年的岩演变. 艾兰石晶体揭示了11万年的停滞期,随后在大规模喷发之前,35,000年的融化多样性不断增加.
科学领域:
- 地质化学 地质化学
- 火山学 火山学是一门学科.
- 同位素地质年代学 同位素地质年代学
背景情况:
- 最年轻的托巴塔夫 (YTT) 喷发代表了地球上最大的四分期火山事件.
- 了解超级喷发之前的长期岩过程对于危险评估至关重要.
研究的目的:
- 重建导致YTT超级喷发的岩过程和时间表.
- 利用艾兰石晶体化学和地质年代学来解读岩储存和演化.
主要方法:
- 来自YTT的艾伦酸盐晶体的化学分析.
- 艾伦石晶体的年代测定,以确定岩演变的时间表.
- 组合区分分析以推断岩性质的变化.
主要成果:
- 艾兰石晶体记录了至少15万年的岩储存和演变.
- 主要的亚火山性岩在约11万年内保持同质性和热性停滞.
- 融化多样性和系统增长的显著增加发生在火山爆发前35,000年.
结论:
- YTT超级喷发是长期的岩积累和以后的快速进化阶段的高潮.
- 艾兰石地质年代学为大型状系统提供了爆发前的岩动态的详细记录.
相关概念视频
02:56The Fossil Record
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
01:15Quarrying of Stone
Quarrying is the process of extracting stone from a quarry, where specialized techniques are employed to remove large blocks of stone safely and efficiently. This process can involve controlled explosions or more precision-oriented methods such as cutting and drilling.
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the block.
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the block.