\nScripps Institution of Oceanography<\/em>
\n“Not Feeling the Buzz:\u00a0Tectonics – Not Climate – Limits Heights of\u00a0Mountains”<\/p>\n
The potential to rapidly denude topography at and above the glacier Equilibrium Line Altitude (ELA), irrespective of uplift rates, rock type or pre-existing\u00a0topography, is explored in the\u00a0glacial buzzsaw<\/i>\u00a0hypothesis.\u00a0In this talk, I offer evidence from\u00a0cosmogenic\u00a0nuclide data and numerical models that (1) topography can persist in a state of\u00a0transience for millions of years through\u00a0feedbacks that can promote and\u00a0maintain subdued topography dissected by valleys and that (2) the\u00a0glacial buzzsaw\u00a0cuts down\u2013not\u00a0across. Finally, we compiled tectonic, topographic, and erosion rate data from Arc-Continent convergent margins where the convergence rate is known (Andes, Central America, Cascadia, British Columbia, Alaska, Taiwan, and Makran). Erosion rates and elevation maxima and mean elevations correlate linearly with plate convergence rates. Importantly, mountain peaks in three heavily glaciated mountain ranges (Alaska, Cascadia, and South Chile) do not deviate from the trend of unglaciated mountain ranges such as the Central Andes and Taiwan. That mountain ranges with different climatic characteristics fall within the same trend implies that tectonics is the primary control of mountain range mass and heights\u2013not glaciers. Jane Willenbring is an Associate Professor at Scripps Institution of Oceanography, UC San Diego. She joined Scripps in the summer of 2016 and is the Director of the Scripps Cosmogenic Isotope Laboratory. She received her B.Sc. from North Dakota State University, where she was a McNair Scholar, and a Master\u2019s degree from Boston University. She received her Ph.D. in Earth Sciences from Dalhousie University in Halifax, Nova Scotia Canada and was named an Izaak Walton Killam Laureate. She was a Synthesis Postdoctoral Fellow through the National Center for Earth-Surface Dynamics, and an Alexander von Humboldt Fellow at GFZ Potsdam, Germany. Jane was previously a professor at the University of Pennsylvania and a Blaustein visiting professor at Stanford University. She is a Fellow of the Geological Society of America and in 2016 was awarded an NSF Career grant.<\/p>\n Meeting flyer to print out & post at your institution<\/a><\/p>\n Beverages and socializing commence at 7:30pm. We meet in the John Wesley Powell Auditorium of the Cosmos Club, Entrance is through the club gate, the first right-hand entrance on Florida Avenue north of the intersection with Massachusetts Avenue NW. The auditorium entrance is to the left of the gate. The Powell Auditorium is within walking distance of the DuPont Circle Metro stop (Q Street exit), the Connecticut Avenue bus routes (L2, L4), and the Massachusetts Avenue bus routes (N2, N4).<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":" GSW meeting 1533: Wednesday, October 3 ~ The 2018 Bradley lecture ~ Jane Willenbring Scripps Institution of Oceanography “Not Feeling the Buzz:\u00a0Tectonics – Not Climate – Limits Heights of\u00a0Mountains” The potential to rapidly denude topography at and above the glacier … Continue reading ![\"Mountains\"](\"https:\/\/gswweb.org\/new\/wp-content\/uploads\/2018\/09\/Mountains.png\")
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\nThe formal program starts at 8:00pm.
\nMeetings are open to the public; please join us!<\/p>\n
\n2170 Florida Avenue NW, Washington DC 20008. <\/strong><\/p>\n