“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
Wandering greenhouse gas
16.03.2018 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
Unique Insights into the Antarctic Ice Shelf System
14.03.2018 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...
On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...
The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...
At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.
When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...
At the ILA Berlin, hall 4, booth 202, Fraunhofer FHR will present two radar sensors for navigation support of drones. The sensors are valuable components in the implementation of autonomous flying drones: they function as obstacle detectors to prevent collisions. Radar sensors also operate reliably in restricted visibility, e.g. in foggy or dusty conditions. Due to their ability to measure distances with high precision, the radar sensors can also be used as altimeters when other sources of information such as barometers or GPS are not available or cannot operate optimally.
Drones play an increasingly important role in the area of logistics and services. Well-known logistic companies place great hope in these compact, aerial...
16.03.2018 | Event News
13.03.2018 | Event News
08.03.2018 | Event News
16.03.2018 | Earth Sciences
16.03.2018 | Physics and Astronomy
16.03.2018 | Life Sciences