Draft minutes from the 1532nd meeting

Your mission, if you choose to accept it, is to review these minutes for inaccuracies, subtle nuances, and anything that might be missing.

1532nd Meeting of GSW Minutes (Draft)

If you spot any errors, email them to meeting secretary Victor Zabielski at gsw.meeting.secretary@gmail.com to be approved at the next meeting.

2018 Bradley lecture:

GSW meeting 1533: Wednesday, October 3

~ The 2018 Bradley lecture ~

Jane Willenbring
Scripps Institution of Oceanography
“Not Feeling the Buzz: Tectonics – Not Climate – Limits Heights of Mountains”

Mountains

The potential to rapidly denude topography at and above the glacier Equilibrium Line Altitude (ELA), irrespective of uplift rates, rock type or pre-existing topography, is explored in the glacial buzzsaw hypothesis. In this talk, I offer evidence from cosmogenic nuclide data and numerical models that (1) topography can persist in a state of transience for millions of years through feedbacks that can promote and maintain subdued topography dissected by valleys and that (2) the glacial buzzsaw cuts down–not across. 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–not glaciers.SIO_Willenbring_headshot250

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’s 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.

Meeting flyer to print out & post at your institution

Beverages and socializing commence at 7:30pm.
The formal program starts at 8:00pm.
Meetings are open to the public; please join us!

We meet in the John Wesley Powell Auditorium of the Cosmos Club,
2170 Florida Avenue NW, Washington DC 20008.

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).

Meeting 1532 (Sept. 12) announcement

Danielle Sumy, IRISInduced earthquake hazard and risk in the United States
Megan Holycross, SmithsonianDiffusion in silicate melts: using atomic-scale processes to track magmatic events
Maya Gomes, Johns Hopkins UniversityEnvironmental Drivers of Extinction: the Early Jurassic Toarcian Oceanic Anoxic Event

Beverages and socializing commence at 7:30pm.
The formal program starts at 8:00pm.
Meetings are open to the public; please join us!

We meet in the John Wesley Powell Auditorium of the Cosmos Club,
2170 Florida Avenue NW, Washington DC 20008.

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).

GSW field trip postponed

Due to the recent rainy weather and a poor forecast this weekend, the GSW field trip to Catoctin Mountain has been postponed until next Saturday, June 9. Please pass the information along, and visit the field trip post (below) for further details and updates.

http://www.gswweb.org/index.php/2018/05/02/gsw-spring-field-trip/

Draft minutes from the 1531st meeting

Relive the drama of the 1531st meeting with this draft copy of the minutes. If you spot any errors, email them to meeting secretary Victor Zabielski at gsw.meeting.secretary@gmail.com to be approved at the next meeting.

UPDATE: GSW Spring Field Trip

catoctin

UPDATED FRIDAY, JUNE 1:

Due to poor weather forecast this weekend, the GSW Spring Field Trip to Catoctin Mountain has been POSTPONED  until Saturday, June 9, 2018.  Ann Wylie of the University of Maryland will lead the trip.

We will meet at 4810 Middlepoint Road, Myersville, MD at 10:00am. If there is no more parking space, please use the Sand Flats parking area, about 1 mile south off Gambrill Road, for overflow parking.

The field trip will extend from the Pre Cambrian Catoctin metabasalt, through the full section of the Loudon and Weverton Formations on Catoctin Mountain, MD. Here is a good overview of the rock units we’ll see on the trip.

The log house is located on the northwest corner of the intersection of Middlepoint and Tower Roads. (Some GPS devices place the house west of the intersection and on the wrong side of the street.) Here we will see the Loudon conglomerate, and the topographic expressions of the metabasalt-Loudon contact and the Loudon-Lower Weverton contact. The second stop is to a boulder field that marks the contact between the Lower and middle Weverton. At the third stop, we will park cars and walk about a mile along the crest of the easternmost ridge of Catoctin Mountain, where we will visit an old magnetite mine and observe an overturned fold revealing the synclinal structure of this ridge. Upper Weverton forms this ridge. We will return to the cars, and visit an overlook of the Frederick Valley close to the border fault. This is a great place to have a late lunch. A geologic map (draft) of the Catoctins which I have constructed will be provided for discussion. We expect the trip to conclude by early afternoon. There is a lot of walking, but the trail on the east ridge is fairly level after an initial gentle incline. The mine is only accessible by hiking. The boulder field is also a short walk along a trail.
Explore in advance using LiDAR and Google Earth (download the KMZ file from the link below, then just open it in Google Earth):
https://drive.google.com/file/d/1bjzbTbBrBFoFpvOjuxr32l5oZ1rg0BlZ/view?usp=sharing (98 MB)

A direct link to the PDF of the Catoctin Furnace geologic quad is here: http://www.mgs.md.gov/output/maps/quadgeo/CATOCGEO2004_1.pdf

Or, view a color version of the MD lidar in 3D just using a browser here (it’s the “MD elevations” layer near the bottom of the layer list), along with other layers, though the 1968 geologic map is not always geographically correct due to scale and other factors. (Thanks to Martin Schmidt for the link).

Meeting Number 1531, May 2, 2018

The 1531st meeting of the Society will be on
Wednesday, May 2, 2018
,
featuring:

Hélène Le Mével, Carnegie Institution – Volcanic unrest in the Southern Andes of Chile

Richard Ortt, Maryland Geological Survey – Title TBA (projects of the MD Geological Survey)

Anne Thompson, NASA – Environmental Success Stories – The View from Space

Meeting flyer to print out and post at your institution – Help spread the word!

Beverages and socializing commence at 7:30pm.
The formal program starts at 8:00pm.
Meetings are open to the public; please join us!

We meet in the John Wesley Powell Auditorium of the Cosmos Club,
2170 Florida Avenue NW, Washington DC 20008.

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).