Peridotite Xenoliths! AEG-BWH Meeting, Thursday, January 15

Geologists and students:

I want to personally invite you and your colleagues to the January 15, 2015 AEG-BWH meeting featuring Fred Davis of The Smithsonian. He will be speaking on: Peridotite Xenoliths: A Window into the Mantle. The meeting is at Brewer’s Alley in Frederick. Please register immediately via email to Patrick Hastings at AEGBWHSecretary. Below is the full notice.

Steve Stokowski, PG
Chairman, AEG-BWH


Notice of Meeting

Announcement from the BWH Section of the
Association of Environmental & Engineering Geologists

Date: Thursday Jan. 15, 2015

Baltimore MD – Washington DC – Harrisburg PA

TOPIC: Peridotite Xenoliths: A Window into the Mantle

Xenoliths are rocks from the deep crust and upper mantle that are carried to the surface by violent volcanic eruptions. Peridotite xenoliths are a direct source of information about the chemistry and petrology of Earth’s mantle, which cannot be observed directly. The mantle is the largest layer of the Earth and is the source of basaltic lavas. In my research, I analyze the chemical compositions of the minerals olivine, orthopyroxene, clinopyroxene, spinel, and garnet from peridotite xenoliths to investigate how the composition of Earth’s mantle has changed over time due to recycling of crust and sediments from the surface back into the deep earth through subduction. I am particularly interested in using the concentrations of transition metals, such as Mn, Fe, and Zn, to learn about mantle rocks that partially melt to form basaltic magmas. This work connects with information from seismology and high-pressure experiments to give a clearer picture of the present state of Earth’s interior and how it has evolved through time.

Dr. Fred Davis, Ph.D. is a postdoctoral fellow in the division of petrology and volcanology at the Smithsonian Institution. Fred is interested in the chemical evolution and dynamics of the solid Earth and terrestrial planets, particularly as expressed by the chemistry of basaltic lavas. He investigates the processes of melt generation and evolution through experimentation at high temperature and pressure in the piston cylinder apparatus and under varying redox conditions in gas-mixing furnaces. He is also interested in investigating the petrology of the upper mantle by examining natural basalts and mantle xenoliths.


Chair: Steve Stokowski, AEG BWH, (508) 259-3536,
Vice Chair: William Mikalik, Applied Environmental, Inc.,
Secretary/Treasurer: Patrick Hastings, Seismic Surveys Inc.,


DATE: Thursday Jan. 15, 2015
TIME: 6:00 p.m. to 8:45 p.m.


Brewers Alley
124 N. Market Street
Frederick, MD 21701 (Downtown)

Here is the Google Map link to Brewers Alley. (or here:,+Frederick,+MD+21701,+USA&pw=0&t=h&z=16
); Parking is either where you can find it on the street, OR, there is a
multistory, municipal parking garage directly behind the restaurant (note
the long rectangular building east of Brewers Alley when you open the Google
Map/Satellite link). The clearance is approximately 6”8”, which is lower
than some vans.

The parking garage entrance is off Church Street, a one-way heading east. If
coming north on 355/N. Market Street (from I-270), cross over Patrick Street
(the divider between N & S street designations), and turn Right on Church,
and left into the garage. If exiting I-70 (from Balto, for ex), go north
on North on S. East Street, cross over canal, turn left on E. Patrick, Right
on Frederick and Right on Church into garage on left.

COST (dinner & mtg):
Bring personal or company check or cash to the meeting and pay treasurer
before presentation.
Members: $35
Non-members: $40
Students: $25


6:00 to 7:00 pm Social, Networking and Registration
7:00 to 7:45 pm Dinner
7:45 to 8:45 pm Presentation, Questions, Closing Statements

To reserve a seat, please email Patrick Hastings by Monday, January 12,
2015 at AEGBWHSecretary.

AEG-BWH 2015 Upcoming Meetings/Field Trips
February 19 – Employment Roundtable at George Mason University
March 19 – Presenter TBD
April 18 (Saturday) – AEG-BWH Spring Symposium (NEW! and at James Madison
May 21 – Presenter TBD


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