Japan Geoscience Union Meeting 2014

Presentation information

Print

Oral

Symbol B (Biogeosciences) » B-PT Paleontology

[B-PT26_2AM1] Paleogenomics

Fri. May 2, 2014 9:00 AM - 10:45 AM 421 (4F)

Convener:*Kazuyoshi Endo(Department of Earth and Planetary Science, Tokyo University), Naohiko Ohkouchi(Japan Agency for Marine-Earth Science and Technology), Tsuyoshi Komiya(Department of Earth Science & Astronomy Graduate School of Arts and Sciences The University of Tokyo), Chair:Kazuyoshi Endo(Department of Earth and Planetary Science, Tokyo University)

9:15 AM - 9:30 AM

[BPT26-02] Evolution of the Earth's environment: A view from sedimentary alkyl porphyrins

*Naohiko OHKOUCHI1, Yoshito CHIKARAISHI1, Hisami SUGA1, Nanako OGAWA1 (1.JAMSTEC)

Keywords:Porphyrins, Sediment, Earth's surface environment

Alkyl porphyrins are derivatives of chlorophylls that are formed in the surface of the Earth by photosynthesizers. Structural changes associated with the diagenetic processes have been intensively studied during the last half a century. Now we know that some alkyl porphyrins are derived only from specific chlorophylls that are originated from a specific type of photosynthesizers. Together with carbon and nitrogen isotopic compositions, such structural information provides a profound insight on the critical evaluation of the surface water environment in the geological past. In this presentation, I will review the diagenetic alteration of chlorophyll structures and review the current evidence.