Kyushu University, Kumamoto University, Japan Agency for Marine-Earth Science and Technology, Kobe University, Chiba Institute of Technology, Waseda University started with large-scale volcanic activity in the "rainy era" about 2 million years ago to 3400 million years ago. It was revealed that volcanic activity and long rains may have caused simultaneous changes in the ecosystem such as mass extinction of marine organisms and diversification of dinosaurs on land.

 It is known that the Triassic period of the Mesozoic period (about 2 million years ago to 5190 million years ago) had a generally hot and dry climate, of which about 2 of the period called "Carnian". From 130 million years ago to 2 million years ago, there are traces of the "rainy era" in which rainfall increased for about 3400 million years. This climate change, called the "Carnian heavy rainfall event," coincided with the extinction of some organisms and the time of major evolutionary changes, but it was not known what caused the long rains.

 In this study, we investigated a rock called a chart observed on the Kiso River bed in Sakahogi Town, Gifu Prefecture, and discovered a low osmium isotope ratio peculiar to the mantle material inside the earth from the chart in the early Carnian period.This is evidence of the large-scale volcanic activity that occurred in the early Carnian and the large supply of osmium derived from it to the ocean.

 In addition, dating using conodont fossils and organic carbon isotope strata found that the rainy era had arrived during periods of high volcanic activity.In other words, it was very likely that volcanic activity triggered the Carnian heavy rainfall event.

 The large-scale volcanic activity of Carnian revealed in this study led to rapid changes in temperature and anoxicization of the ocean, and the mass extinction that occurred in this era is similar to the mass extinction in other eras. May have been involved in.In addition, since it is thought that the explosive diversification of dinosaurs and the birth of mammals also occurred during the Carnian heavy rainfall event, what kind of environmental changes will be caused by volcanic activity during this period, and the ecology. It is necessary to proceed with research on whether it contributed to system change.

Paper information:[Global and Planetary Change] Marine osmium isotope record during the Carnian “pluvial episode” (Late Triassic) in the pelagic Panthalassa Ocean

Kobe University

To an outstanding research university that shines with advanced research and fusion research

Kobe University, which is located in a port city open to the world, has 4 faculties and 10 faculties under the 15 university arts series of "humanities / human sciences", "social sciences", "natural sciences", and "life / medical sciences". It is a comprehensive university with a graduate school, one research institute and many centers. Based on the philosophy of "harmony between science and reality," we have strengths in both the humanities and science fields […]

Kyushu University

A university that creates "comprehensive knowledge" that opens up the future and drives social change

Kyushu University, which celebrated its 111th anniversary this year, is a core university with 12 faculties and 19 faculties.We have been designated as a "designated national university corporation" that can be an international base by developing the world's highest level of outstanding education and research activities.From the humanities and sociology that we have cultivated so far to the natural sciences, and even the design-related "knowledge" […]

Chiba Institute of Technology

Foster professionals who learn cutting-edge science and technology and contribute to world culture with technology

Chiba Institute of Technology was founded in 1942 as "Koa Institute of Technology" in response to social demands to train advanced science and technology engineers and enrich Asian countries including Japan.In the 17 years since then, it has continued to support Japan's growth through manufacturing, and is now the oldest existing private technical university […].

Waseda University

Reform with the aim of "WASEDA shining in the world" with research, education, and contribution as the three pillars

Waseda University has created an unparalleled environment in which all students can hone their ability to take on unanswered issues based on the three founding principles of "independence of academics, utilization of academics, and creation of model people."Aiming to be a world-class university with unwavering international competitiveness, "WASEDA that shines in the world," "Waseda for research" and "[…] for education.

Kumamoto University

Search for truth and newness.Kumamoto University aims to be a "True Global University"

Kumamoto University, which has a long history and tradition of more than 130 years, has set "Human resources development that can" Global Thinking and Local Action "by inheriting the spirit of Tsuyoshi Kiyoshi since the old system of Goko" in its educational strategy.A new creative "knowledge" was born and raised for a bright future, any [...]

University Journal Online Editorial Department

This is the online editorial department of the university journal.
Articles are written by editorial staff who have a high level of knowledge and interest in universities and education.