2004 Joint Assembly

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Biogeosciences

Mer Bleue bog

8:00 a.m.–5:00 p.m. Sunday, 16 May 2004
Limit: 47.
Cost: $40 (US), including lunch, site booklet etc.

You may register for this field trip via Online registration forms (no longer available).

Leaders: Tim Moore & Nigel Roulet (McGill University), Jill Bubier (Mount Holyoke College), Peter Lafleur (Trent University) and Pierre Richard (Université de Montréal)

Mer Bleue is a large, ombrotrophic bog located 15 km east of Ottawa. During the last 6 years, research has been conducted on the biogeochemistry and ecology of this system. The field trip will include discussions of eddy–covariance tower measurements of CO2 exchange, chamber–based measurements of CO2 and CH4 flux, plant ecology and response to N and P fertilization, hydrology, the biogeochemistry of a drained beaver pond and peatland evolution and C modelling. Time and weather permitting, we shall also visit Alfred bog where peat is being harvested for horticultural purposes.

The buses will be departing at 8:00 a.m. from 1001 rue Bleury. This is the Northwest corner of Palais de Congres at the intersection of rue Bleury and rue Viger.

Mont Saint-Hilaire Forested Catchment

9:00am–5:00pm, Saturday May 22, 2004.
Limit: 12
Cost: ~30 $ CAN (cost of transportation and entrance to the biosphere reserve).

Mont Saint-Hilaire is a forested UNESCO biosphere reserve and one of the Monteregian Hills of Quebec located 32 km east of Montreal. This field trip will provide a practical opportunity to examine some of the issues raised in the “Issues of Scale in Catchment Hydrobiogeochemistry” session and at the meeting.

In an area of 150 ha (1.5 km2), eight drainage basins, varying in size from 7 to 150 ha, have been established in a nested framework to examine the influence of scale on runoff generation and stream water chemistry. We shall examine the important characteristics of the drainage basins (variations in soils, topography, vegetation, soil moisture and water table). I shall present information on runoff, especially during storms, and the hydrologic pathways which influence the chemistry of the streams.

For more information, please contact:

April James
Department of Geography, McGill University
McGill Centre for Climate and Global Change Research (C2GCR)
Burnside Hall, Rm 705
805 Sherbrooke Street West
Montreal, Quebec, Canada, H3A 2K6
Email: april.james@mail.mcgill.ca
Fax: +1 (514) 398-7437

VGP Fieldtrips (2)

VGP 1: Thetford Mines Ophiolite, Quebec, Canada

15–16 May 2004

To express interest in taking part in or to register for this fieldtrip, please contact Jean Bédard, jbedard@rncan.gc.ca and not AGU or VGP directly.

Leaders: Jean H. Bédard (GSC–Quebec, Canada) and P. Pagé (INRS–ETE, Canada)

The Thetford Mines Ophiolite is located about 1.5 hours drive from Montreal, and hosts two Pt–Pd showings. The 2–day pre–meeting fieldtrip will show the principal features of this well preserved, well–exposed boninite–dominated ophiolite. Although we will spend some time looking at features specific to Pt–Pd mineralization (related to Special Session V09: Siderophile and Chalcophile Elements: Analysis and Interpretation), the fieldtrip will be of interest to attendees of other sessions, including V11 (stops # 5, 8, 9, 12), V12 (stops # 4–13), V14 (all stops: for comparison with putative Archean ophiolites), and V17 (stop # 3).

Stops will be made at representative examples of most important facies in the ophiolite, but special emphasis will be put on the PGE–enriched zones. Stops will include: 1) the Laurentian margin (mylonitic contact with the mantle rocks and migmatized metasedimentary rocks); 2) the amphibolite sole, including lineated hb–plag–ep–rutile–qz amphibolite and high–P garnet–bearing metapelite; 3) the mantle, including typical harzburgite, intrusive dunite and chromitite pods; 4) dunitic to harzburgitic lowermost crustal cumulates with interbedded PGE–poor chromitites; 5) intra–oceanic normal faults with prominent syn–magmatic breccia complexes and feeders to overlying lavas; 6) middle–crustal pyroxenites hosting an unusual potharite–bearing (PdHg) Pd–Pt–rich chromitite vein system (Starchrome showing), surrounded by orthopyroxenitic reaction rims; 7) a discordant mid–crustal dunitic pipe containing a platiniferous chromitite breccia–filled core (Hall deposit); 8) hydrothermally altered and veined layered gabbroic rocks; 9) an apical trondjhemite breccia complex transitional to the sheeted dykes; 10) sheeted dykes; 11) spectacular boninitic pillow lavas; 12) subvolcanic explosion breccias at the base of the supracrustal section; 13) rhyodacitic pyroclastic deposits; 14) an overlying fore–arc flysh deposit grading from debris flows dominated by ophiolitic detritus, to sediments dominated by Laurentian margin debris.

The fieldtrip will start in Montreal early morning on Saturday 15 May (participants must take care of their own lodging on Friday and Sunday nights). The meeting point will be a central location in Montreal; the party will drive directly to the Thetford Mines outcrops (bu prior arrangement, participants may rent their own cars and meet the main party in Thetford Mines). Depending on the number of participants, rental minivans or cars will be used (gas and rental costs around $75–100/attendee). Saturday night will be at the Balmoral Hotel/Motel (shared accommodation, around $50/person), with the return to Montreal on Sunday evening. All meals, beer and wine will be at attendees' expense. A fieldtrip guide will be available at modest cost. Total cost per participant will be around $200–250 Can. The number of participants will be limited to around 15. To keep costs down, this is an informal fieldtrip. The leaders will deal directly with participants.

VGP Fieldtrip 2: Ossipee Ring Complex, New Hampshire, USA

21–24 May 2004

To express interest in taking part in or register for this fieldtrip, please contact either Ben Kennedy, Ben@eps.mcgill.ca, or John Stix, Stix@eps.mcgill.ca, and not AGU or VGP directly.

Leaders: Ben Kennedy & John Stix (McGill University, Canada)

A weekend fieldtrip is being arranged for the 21–24th of May, after the Joint Assembly in Montreal. The Ossipee ring complex is an eroded caldera with a beautifully exposed ring dyke. The ring dyke, which channeled magma to the surface during caldera formation and resurgence, contains syenites with inclusions of pyroclastic and porphyritic rhyolite, abundant inclusions of a hornblende–rich syenite, and basalt dykes. The different inclusions have distinctly different compositions, shapes, and abundances. Some inclusions are seen Adissolving@ into the syenite, and the syenite contains varying percentages of xenocysts which originated from these inclusions. Some areas of the ring dyke acted as eruption conduits, and rhyolite mingled explosively with basalt producing intrusive pyroclastic rocks with mingled textures. Also, exposed within the caldera are ignimbrites, a variety of breccias and the floor of the caldera. VGP sessions at the Joint Assembly that are directly relevant to this field trip include: V13 Dynamics of caldera systems; V07 From magma to pyroclasts: flow, vesiculation, solidification and fragmentation; and V12 Magma mixing and mineral chemistry: probing the dynamics of magma chambers.

Ossipee is a four hour drive from Montreal. We will leave Montreal in the afternoon or evening of Friday, 21st of May. We will return to Montreal on Monday, 24th of May. We will travel in minivans and spend 3 nights in a motel next to the ring complex. We will spend Saturday, Sunday, and half of Monday in the field. The price of the trip will be around US $200, which is based on the cost of 3 nights in the Motel (two persons to a room), printing a field guide and hiring minivans. The number of participants will be limited to around 20. To keep costs down, this is an informal fieldtrip. The leaders will deal directly with participants.

 
 

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