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High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For example, the mass of helium...
Diversity of Protists III01:27

Diversity 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,...

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Updated: Jul 11, 2026

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
06:06

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

Published on: August 17, 2016

ストロンチウムイソトープを用いた高解像度層図.

D J Depaolo, B L Ingram

    Science (New York, N.Y.)
    |February 22, 1985
    PubMed
    まとめ

    海洋化石におけるストロンチウム-87/ストロンチウム-86の同位体比は,沈殿岩の年代を正確に表している. この地化学的方法は,地質学と古生物学の研究のための高解像度年齢相関を提供します.

    科学分野:

    • 地質化学 地質化学
    • パレオントロジー・パレオントロジー
    • 海洋学 海洋学とは

    背景:

    • 現代の海水におけるストロンチウム-87/ストロンチウム-86 (87Sr/86Sr) の同位体比は比較的一定である.
    • しかし,この比率は地質的な時間尺度で徐々に変化します.
    • 海洋生物は海水からストロンチウムを炭酸殻に吸収し,殻形成時に海洋の87Sr/86Sr比を記録する.

    研究 の 目的:

    • 化石化した海洋炭酸塩殻における87Sr/86Sr同位体比の有用性を地質年代学のために評価する.
    • 堆積岩の高解像度年齢相関に関するこの方法の可能性を確立する.

    主な方法:

    • 化石化した海洋炭酸塩殻の87Sr/86Sr同位体比の高精度測定.
    • 蓄積された化石炭酸塩殻から成る堆積岩の分析.

    主要な成果:

    • 化石貝殻の87Sr/86Sr比は,貝殻の堆積時の海洋の同位体組成の信頼できる代理として機能します.
    • 高精度測定により,精密な年代測定と堆積物の配列の相関が可能です.

    結論:

    • 87Sr/86Sr年代測定法は,他の確立された技術と比較して年齢の解明を提供します.

    さらに関連する動画

    Isolation of Quartz Grains for Optically Stimulated Luminescence (OSL) Dating of Quaternary Sediments for Paleoenvironmental Research
    09:41

    Isolation of Quartz Grains for Optically Stimulated Luminescence (OSL) Dating of Quaternary Sediments for Paleoenvironmental Research

    Published on: August 2, 2021

    Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
    08:43

    Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides

    Published on: May 20, 2019

    関連する実験動画

    Last Updated: Jul 11, 2026

    Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
    06:06

    Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

    Published on: August 17, 2016

    Isolation of Quartz Grains for Optically Stimulated Luminescence (OSL) Dating of Quaternary Sediments for Paleoenvironmental Research
    09:41

    Isolation of Quartz Grains for Optically Stimulated Luminescence (OSL) Dating of Quaternary Sediments for Paleoenvironmental Research

    Published on: August 2, 2021

    Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
    08:43

    Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides

    Published on: May 20, 2019

  • この地化学的アプローチは,地質学,古生物学,古海洋学,地化学のさまざまな問題に取り組むのに価値があります.