火山与冥王星的平价以及大陆地的分化
C Brenhin Keller1, Blair Schoene1, Melanie Barboni2
1Department of Geosciences, Guyot Hall, Princeton University, Princeton, New Jersey 08544, USA.
Nature
|July 17, 2015
概括
地化学分析显示,火山岩和浮动岩在俯冲区是相似的,但在大陆裂中是不同的. 部分结晶,而不是地融化,主要形成岩.
科学领域:
- 地质化学
- 石油学
- 地球科学
背景情况:
- 大陆地的演变是地球历史的关键.
- 地的异质性阻碍了岩石的地化学比较.
- 了解分化过程对于岩形成至关重要.
研究的目的:
- 在全球范围内比较火山和岩的地化学差异化趋势.
- 在不同的构造环境中研究形成中间和岩的过程.
- 确定负责地分化的主要机制.
主要方法:
- 全球火山和岩全岩地化学数据集的分析.
- 主要和微量元素差异化模式的比较.
- 评估不同构造环境中的岩石水含量和喷发性.
主要成果:
- 在潜伏区的火山岩和浮动岩之间无法区分分化趋势.
- 在大陆裂设置中,差异化趋势不同,这表明浮动岩中的水含量较高.
- 与干燥的火山岩相比,元素模式的抵消表明水性浮动岩的喷发性降低.
结论:
- 分裂结晶是产生中介和岩岩的主要过程.
- 地融化在岩岩的形成中起到较小的作用.
- 马菲克积累物是大陆地分化的主要残留物.
相关概念视频
Isothermal Processes
5.4K
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
5.4K
Formation of Species
46.9K
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
46.9K
Speciation Rates
23.5K
Overview
23.5K
Diversity of Protists III
2.0K
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
2.0K
Diversity of Archaea II
634
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
634
Diversity of Archaea III
441
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
441


