マイクロテクタイト,マイクロクリスタイト,スピネルは,南洋におけるプレオセンの後の小惑星の衝突によるものです
Science (New York, N.Y.)
|March 29, 1991
まとめ
太平洋南東部のプレオセンの終わりの小惑星衝突からのガラスの球体は,マイクロテクタイトとマイクロクリスタイトに似ています. そのマグネシオフェライト・スピネルの挿入は,クレタセアス・テリシアル境界の衝突残骸に似た衝撃蒸気から形成されたことを示唆している.
科学分野:
- 地質学 地質学 地質学
- 惑星科学は惑星科学である.
- 堆積物学 堆積物学 堆積物学 堆積物学 堆積物学
背景:
- ガラスのような球体は,堆積物の堆積物の中に存在します.
- これらの球体は小惑星の衝突と関連しています.
- マイクロテクタイトとマイクロクリスタイトの区別は難しいかもしれません.
研究 の 目的:
- プレオセンの後の小惑星の衝突によるガラスの球体の性質を特徴づけるために.
- これらの球粒を,既知のマイクロテクタイトやマイクロクリスタイトと比較する.
- 衝突球体の形成条件を理解する.
主な方法:
- プレオセンの終わりの沈殿堆積物からのガラスの球体の分析.
- スフェルル属性の比較とマイクロテクタイトとマイクロクリスタイトに関する既存のデータ.
- スフェルルインクルージョンの顕微鏡および化学分析.
主要な成果:
- プレオセンの後半の衝突からの球体は,マイクロテクトイトとマイクロクリスタイトの両方に類似した性質を示しています.
- これらの球体は,衝突で発生した蒸気雲からの融解したシリケート滴から形成された可能性が高い.
- マグネシオフェライト・スピネルのインクルージョンが特定され,クレタセウス時代と第三期の境界の衝突球体で見つかったものと類似しています.
結論:
- 研究された球粒は,衝突の残骸であると確認されています.
- これらのプレオセンの後半の球球の形成条件は,白亜紀と地質期の境界の条件に類似していました.
- インパクトイベントは,異なる時代の異なる特徴を持つ異なる地質学的マーカーを作成します.
さらに関連する動画
14:38Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
Published on: April 20, 2012
13:38Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
Published on: October 26, 2019
関連する概念動画
02:06Conditions 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.
02:06Conditions 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.
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,...
01:29Diversity of Archaea IV
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 thermal...
01:27Diversity of Archaea III
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 environments.Morphological...
01:50Global 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.