まとめ
考古学的な分類的多様性グラデーションは,地球の古代の回転極の位置を特定することができます. プランクトン系フォラミニフェラとブラキオポッドの分析により,現在の位置付近に極があることが示唆され,古磁気モデルに異議を唱える.
科学分野:
- パレオントロジー・パレオントロジー
- 地質物理学 地質物理学とは地質物理学です.
- 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
背景:
- 分類学的な多様性のグラデーションは,緯度の温度グラデーションの影響を受けます.
- 地球の古代の回転極の位置を特定することは,古生物学とプレート構造の理解に不可欠です.
- 古代の極の位置を決定するための以前の方法には,限界があります.
研究 の 目的:
- 古代の回転極の位置を決定するための定量的な古生物学的技術として,分類学的多様性グラデーションの有用性を調査する.
- 分類学的な多様性と緯度温度梯度間の関係を分析する.
- 古生物多様性のデータを既存の古磁気モデルと比較する.
主な方法:
- Recent planktonic foraminifera.からの分類学的多様性データに関する統計的分析
- 同様の分析をペルミアのオルソテタケイド・ブラキオポッドの多様性データにも適用した.
- 多様性に基づくポールポジションモデルと古磁気データとの比較.
主要な成果:
- プランクトンのフォラミニフェラの多様性と緯度温度グラデーションの間に強い相関が認められ,極の位置を可能にしました.
- ペルミア紀の腕足類の分析は,現在の回転極に近い古代の極の位置を示唆しています.
- 入手可能な多様性データは,ペルミア紀の古磁気学的結果よりも,現在の地球モデルに適しています.
結論:
- 分類学的な多様性グラデーションは,古代の回転極の位置を再構築するための実行可能な方法を提供します.
- この発見は,地球の磁気極と回転極が常に一致しているわけではないことを示唆している.
- 不一致の磁極と回転極を認める地磁場モデルのさらなる検討は正当である.
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