“The formation of rocks has everything to do with climate,” says the associate professor of geological sciences and engineering at Missouri University of Science and Technology. “Different climate settings have different sediments, soil types and vegetation. The beauty of the geological record is that we can see changes in the past, which gives us some guide to predict future changes.”
Yang spends his summers working in northwest China because it’s one of the few places to have a land record from Pangea, the supercontinent that existed between 200 million and 350 million years ago. Land records are hard to preserve because they are exposed to the elements, Yang says, so most research has typically been done using marine records instead. The seawater offers better protection of the rocks below, as Missouri S&T students saw first-hand in June during a field course led by Yang and two other professors from Trinity and Guizhou universities in southern China.
After the field course was complete, Yang, along with two Missouri S&T graduate students and collaborators from Chinese institutes, spent six weeks camping and hiking in the high desert, where temperatures averaged between 100 and 120 degrees. The team was surprised to uncover a complete, fossil skeleton of a vertebrate animal while working to collect their samples. The two-foot long skeleton was later covered to protect it from being exposed to the elements.
“Most people don’t realize that 250 million years ago, the greatest, most severe mass extinction in the earth’s history occurred,” Yang says. “That’s when the earth’s climate shifted from icehouse to greenhouse. There are a lot of theories, but we don’t know the real causes of the mass extinction yet.”
Yang returned to Rolla in early August with more than 300 pounds of volcanic ash (known as tuff). Zircon, a special mineral in the ash, can be used to accurately date the rocks and will help to more precisely determine the pace of the terrestrial mass extinction and climatic change, he says.
“There are so many things we would like to know,” he says.
What is known is that after remaining in a greenhouse state for about 230 million years, the earth transitioned back to an icehouse climate roughly 30 million years ago. Since then, the earth’s climate has cycled between glacial and interglacial periods. For example, 18,000 years ago there were glaciers just north of Kansas City, Mo., he says.
“For the last 6,000 years, we’ve been in an interglacial period,” he says. “The climate has been warm but it’s within natural variations. We’ve seen more extreme ones and theoretically, it’s time to go glacial,” Yang says.
Yang plans to return to northwest China on a regular basis throughout his career to conduct more detailed studies in a wider area.
Contact: Missouri S&T Public Relations, 573-341-4328, firstname.lastname@example.org
Mindy Limback | Newswise Science News
PR of MCC: Carbon removal from atmosphere unavoidable for 1.5 degree target
22.05.2018 | Mercator Research Institute on Global Commons and Climate Change (MCC) gGmbH
Monitoring lava lake levels in Congo volcano
16.05.2018 | Seismological Society of America
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.
The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
23.05.2018 | Life Sciences
23.05.2018 | Physics and Astronomy
23.05.2018 | Materials Sciences