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プレオセンの後半期の海洋小惑星の衝突の大きさと可能性のある影響に関する新しい証拠
まとめ
プレオセンの後半の大規模な小惑星の衝突は,南東太平洋の床に瓦を散らした. この重要な小惑星の衝突は北半球氷河期の始まりと一致する可能性がある.
科学分野:
- 地質学 地質学 地質学
- 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
- インパクトクラテリング (インパクトクラテリング)
背景:
- プレオセンの後の地質学的記録は,初期の氷河期を理解するために重要である.
- 小惑星の衝突は,潜在的な地球規模の影響を持つ重要な地質学的なイベントを表しています.
研究 の 目的:
- 太平洋南東部のプレオセンの後の小惑星衝突の証拠を特定し,特徴づけること.
- 衝突した小惑星の大きさと潜在的重要性を決定する.
- 衝突のタイミングと北半球氷河期の発生を相関させるため.
主な方法:
- 深海の沈殿体内におけるイリジウム濃度の分析.
- 堆積層のストラティグラフィック年代測定. 堆積層のストラティグラフィック年代測定.
主要な成果:
- 東南太平洋の600km以上の地表に広がった小惑星の衝突残骸の発見.
- 衝突した小惑星の直径は少なくとも0.5kmと推定され,近年の地質学史上最大の1つであることを示唆しています.
- 北半球氷河の発生の推論されたタイミングとの衝突の層図年齢の相関.
結論:
- 大規模な小惑星の衝突は,南東太平洋のプレオセンの後半に起こった.
- この衝突は,少なくとも直径0.5キロメートルの弾丸で,かなり大きなものであった.
- この衝撃のタイミングは,北半球の大規模な氷河化の開始と一致しており,潜在的な因果関係を示唆しています.
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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.
The 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...
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.
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.
What is Evolutionary History?
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics. Together, the fossil...
The Evidence for Evolution
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.