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Making a Geologic Cross Section
Published on: April 30, 2023
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太陽系の混沌と,地質学と天文学によって制約されたパレオセーン-エオセンの境界年齢
Richard E Zeebe1, Lucas J Lourens2
1School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 1000 Pope Road, MSB 629, Honolulu, HI 96822, USA. zeebe@soest.hawaii.edu.
Science (New York, N.Y.)
|August 31, 2019
まとめ
天文学的データによって 年代測定は5千万年を超えました 新しい 発見 に よる と,旧生~新生 期 の 熱 最大 度 が 明らか に なっ た
科学分野:
- 地理科学
- 天文学
- 古代気候学
背景:
- 天文学的計算はサイクロストラティグラフィーとアストロクロノロジーに不可欠です.
- 現在の天文時間のスケールは,軌道計算の不一致のために,過去5000万年に限定されています.
- この時間スケールを拡張することで 地球の古代の気候と軌道動態に関する 重要な洞察が得られます
研究 の 目的:
- 現在より5000万年先の 絶対的な天文時間スケールを 開発する
- パレオセヌス・エオセヌス境界の年齢を精査し,パレオセヌス・エオセヌス熱極限 (PETM) の期間を決定する.
- 軌道のトリガーとPETMの持続時間を調べるため
主な方法:
- 地質学的データを新しい天文学的解決法 (ZB18a) と統合する.
- 過去の軌道構成を再構築する高解像度天文モデリング.
- 天文学的な周期と相関する 沈殿物の正確な年代測定
主要な成果:
- 58~5300万年前の地質学的データと ZB18a の天文学的解の間の例外的な一致です
- 現在より5800万年前まで続く新しい絶対的な天文年代を確立する.
- 現在より560万年±050万年前の新しいパレオセーン-エオセンの境界年齢の決定.
- PETMの始まりは 40万5千年の特異性の最大値と一致し 軌道トリガーを示唆しています
- PETMの期間は170年±3万年と決定された.
結論:
- この新しい天文学的解決法により かつてないほど長く正確な天文年代測定が可能になりました
- 軌道フォースはPETMを誘発するのに 重要な役割を果たした
- 太陽系は5千万年前に 混沌とした共鳴を体験し 基本的な周波数に影響を与えました
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