地質物理および地化学の証拠は,深層の温度変動が,中海の山脊の下にあることを示しています
Colleen A Dalton1, Charles H Langmuir, Allison Gale
1Department of Earth and Environment, Boston University, 685 Commonwealth Avenue, Boston, MA 02215, USA.
まとめ
地球のマントルの温度変動は250°Cを超え,深さは400kmを超え,マントルのコンベクションと海洋流域の深さに影響を与えます. この研究は,地震データ,山脊の深さ,玄武岩の組成を統合して,地球温暖化パターンを明らかにしています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地球科学 地球科学 地球科学
- 惑星科学は惑星科学である.
背景:
- マントルの温度と構成は,コンベクションの活力や海流域の深さなどの地球の性質を根本的に制御しています.
- 地震波の速度,海洋の深さ,中洋の玄武岩組成は,マントルの変化の重要な指標である.
- これらの指標は,しばしば別々に分析され,マントルのダイナミクスの包括的な理解を制限します.
研究 の 目的:
- 地震波の速度,海洋の深さ,中洋の玄武岩組成を統合してマントルの温度と組成を決定する.
- マントルの熱と組成の変動の範囲と性質を調査する.
- 地震速度の解釈のための熱校正スケールを確立する.
主な方法:
- 地震波の速度と海のの深さを相関させる.
- 中洋のの玄武岩の組成を分析した.
- 統合されたデータセットをマントルの温度と組成のモデルと比較する.
主要な成果:
- 観測された相関は,400km以上の深さまで広がる250°Cの温度変動と一致しています.
- 結果は,常温下でのマントルの組成の変動と矛盾しています.
- 異常な熱いのセグメントはホットスポットと相関しており,ホットスポット火山活動の源となる深いマントルの羽根を示唆しています.
結論:
- 一貫したマントルの温度信号は,地球全体に存在し,かなりの深さまで広がっています.
- 組成ではなく,マントルの温度変動が,山脊における観測された地震および水位測定データの主要な要因である.
- この熱信号は,中海の山脊から遠く離れた地域における地震速度の解釈に不可欠な校正を提供します.
さらに関連する動画
08:43Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
Published on: May 20, 2019
6.2K
11:50Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
Published on: June 13, 2015
12.0K
関連する概念動画
Deep Sea Microbial Ecology
53
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches...
53
Global Climate Change
24.4K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.4K
Diversity of Archaea IV
639
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
639
Microbial Mats
67
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
67
Diversity of Archaea III
502
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...
502
Marine Microbial Ecology
66
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
66
