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Updated: Jul 12, 2026

07:37
Resurrection of Dormant Daphnia magna: Protocol and Applications
Published on: January 19, 2018
パレオセノ・エオセノ熱最大値と北東大西洋の開口
Michael Storey1, Robert A Duncan, Carl C Swisher
1Quaternary Dating Laboratory, Department of Environment, Society and Spatial Change, Roskilde University Centre, Post Office Box 260, 4000 Roskilde, Denmark.
まとめ
パレオセーヌ・エオセーヌ熱マキシマム (PETM) は,グリーンランド・ヨーロッパプレート境界付近の火山活動中の温室効果ガスの放出によって引き起こされた. このイベントは,約5610万年前から始まった大規模な洪水ベースルト噴火の後に起こった.
科学分野:
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- ジオクロノロジー (Geochronology) について
- プレート・テクトニクス (プレート・テクトニクス)
背景:
- パレオセーヌ・エオセーヌ熱マキシマム (PETM) は,地球温暖化の重要な出来事である.
- 以前の仮説では,PETMは突然の二酸化炭素および/またはメタンの放出に起因すると考えられていた.
研究 の 目的:
- PETMを取り巻く重要な地質学的出来事を正確に年代測定する.
- 火山活動とPETMの発生を相関させるため.
- PETMのトリガーメカニズムを調査する.
主な方法:
- 40Ar/39Arの年齢測定を用いた.
- デンマークのアッシュ17鉱床とスカレントルネ・フォーメーション・タフを年代付けした.
- これらの堆積物をPETMと大陸分裂の出来事と関連付けました.
主要な成果:
- デンマークのアッシュ17鉱床とスカレントルネ・フォーメーション・タフ (Skraenterne Formation Tuff) は同時代のものです.
- PETMの発生は,大規模な洪水ベースルト火山活動 (56.1 +/- 0.4 Ma) の開始後のものです.
- PETMの発生は,推定大陸分裂時間 (55.5 +/- 0.3 Ma) の誤差内にあります.
結論:
- 東グリーンランドの大規模な火山活動がPETMと関連している.
- PETMは,グリーンランド・ヨーロッパプレート境界付近の炭素豊富な堆積物と相互作用するマグマによって引き起こされた可能性が高い.
- この相互作用により,温室効果ガスが放出され,PETMが発生します.
関連する概念動画
Global Climate Change
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.
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Freezing Point Depression and Boiling Point Elevation
Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Freezing Point Depression and Boiling Point Elevation
When a non-volatile solute is added to a pure solvent, it results in the lowering of the freezing point of the solvent. This phenomenon is called freezing point depression. The extent to which the freezing point is lowered depends on the molality of the solute -the number of moles of solute per kilogram of solvent and the cryoscopic constant of the solvent.From the plot of chemical potential, μ, against temperature, it is evident that the μ of both solid and liquid solvents decrease with...
Deep Sea Microbial Ecology
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 extending beyond...

