在巴塔哥尼亚的Chon Aike Silicic大岩性省份确定地贡献
Michelle L Foley1,2, Benita Putlitz1, Lukas P Baumgartner1
1Institute of Earth Sciences, University of Lausanne, UNIL-Mouline, 1015 Lausanne, Switzerland.
概括
乔恩·艾克·西利奇 (Chon Aike Silicic Large Igneous Province,简称CASP) 的火山岩是由地融化形成的. 的同位素揭示了来自金属石源的重大贡献,这表明地的解体驱动了性岩的产生.
科学领域:
- 地质化学 地质化学
- 同位素地质学的同位素.
- 火山学 火山学是一门学科.
背景情况:
- 乔恩·艾克·西利奇大火山地带 (CASP) 的火山岩石主要是地外解的产物.
- 了解岩源对于破译felsic岩起源至关重要.
研究的目的:
- 在CASP中调查潜在的岩源 (地与地幔) 的地化学和同位素差异.
- 识别在解体过程中对性岩有所贡献的地水库.
- 量化不同来源对岩形成的贡献.
主要方法:
- 结合氧和同位素分析.
- 的微量元素分析.
- LA-ICP-MS U-Pb火山单位年代测定地质年代学.
- 二元混合模型 (δ18O-εHf) 来评估融贡献.
主要成果:
- 来自El Quemado综合体 (EQC,约148-153万年) 的石显示富含的 δ18O (79.5‰) 和负的 εHf (-2.0 到 -8.0).
- 来自西部Chon Aike形成 (WCA,约159万年) 的石表现出 δ18O (67‰) 和 εHf (-4.0到+1.5).
- 混合模型显示,70% (EQC) 和60% (WCA) 的融来源于石灰岩地.
- 微量元素表明,来自LIL贫的上大陆地的沉积原石的解剖学.
结论:
- 地的解,特别是石质岩石的部分融化,是产生CASP类岩石的主要过程.
- 高热量流环境与肥沃的石岩地相结合,促进了大量的岩火山活动.
- 玄武岩的岩底层在启动南极事件方面发挥了作用.
相关概念视频
Ionic Crystal Structures
14.3K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.3K
Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences
454
Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
454
Cleavage and Blastulation
45.2K
After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
45.2K
Chromatin Immunoprecipitation- ChIP
11.1K
Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
11.1K
Washing, Drying, and Ignition of Precipitates
911
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
911
Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview
728
In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
728


