薄い地殻は,マリオン・ライズを支えるマントルの枯渇の証拠である
Huaiyang Zhou1, Henry J B Dick
1State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China. zhouhy@tongji.edu.cn
Nature
|February 8, 2013
まとめ
マリオン・ライズは,他の海上のライズとは異なり,薄いか欠落した地殻が特徴で,それを示す.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 海洋地質学 海洋地質学
- プレート・テクトニクス (プレート・テクトニクス)
背景:
- 海洋の上昇は,軸深さの変動によって特徴付けられ,しばしばマントルのホットスポットと関連付けられています.
- アイスランド・ライズに匹敵するマリオン・ライズは,その長さのほとんどに沿ってユニークな軸裂け目を呈しています.
- 南西インド・リッジは,体系的なサンプリングにより,地殻の建築を研究するためのユニークな機会を提供します.
研究 の 目的:
- 南西インディアン・リッジ沿いのマリオン・ライズの地殻構造を調査する.
- マリオン・ライスの形成と特徴に起因する地質学的プロセスを理解する.
主な方法:
- 南西インド山脊の全長に沿って,地質学的サンプルを体系的に採取する.
- 地殻の露出と組成の分析.
- 脊柱システムの地球物理学的解釈.
主要な成果:
- マリオン・ライズで,アイスランド・ライズと対照的にペリドータイトの大幅な露出.
- マリオン・ライズ (Marion Rise) の裂け目を越えて,一般的に薄いか欠けている地殻の証拠がある.
- マリオン上昇は主にイソスタティック反応であり,厚くなった地殻や大きな熱異常によるものではありません.
結論:
- マリオン・ライズの構造は,底辺の枯渇したマントルの同静的調整を示唆しています.
- この枯渇したマントルは,カルーとマダガスカルの洪水ベースルトイベントの間に置かれたマントルから起源がある可能性が高い.
- この研究は,海洋上昇の形成とマントルプロセスとの関係に関する新しい洞察を提供します.
関連する概念動画
01:27Diversity of Protists III
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,...
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...
01:11Papillary Dermis
Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen and...
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen and...
01:21Isothermal Processes
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...
01:24Carbonation Shrinkage
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction facilitates the...
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction facilitates the...
01:09Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...