Location: Rafain Hotel and Convention Center, Foz do Iguacu, Brazil
Web: http://www.agu.org/meetings/ja10/
Includes the following sessions:
P05: Impact cratering on solid planets – shocks on basalts
Convenors: David Baratoux (baratoux@dtp.obs-mip.fr), Masahiko Arakawa (arak@eps.nagoya-u.ac.jp), Alvaro Crosta (alvaro@ige.unicamp.br)
Impact craters on solid planets are often formed on magmatic rocks. For the Moon and Mars, new magnetic, mineralogical and chemical data motivate a better quantification of shock effects on basalt. Recent analyses of craters on terrestrial igneous provinces offer the perspective of comparative studies. Contributions providing insights into the formation of impact craters on magmatic bodies, experimental or field studies (e.g. Vargeao and Cerro do Jarau, or Lonar), and analyses of extra-terrestrial impact structures will be appreciated. A 2-day field trip to Vargeao and Vista Alegre craters is being proposed in association with this session.
V03: Layered intrusions: up and down inside a volcano
Convenor: Nikolai Bagdassarov (nickbagd@geophysik.uni-frankfurt.de)
Layered intrusions represent a time evolution of closed crystallising magma bodies. Pressure, temperature, oxidation state as well as magmatic fluid regime are reflected in density stratification of magmatic minerals inside magma chambers. The session is aimed to discuss petrological field observations of mineral layering in various volcanic environments, numerical and laboratory modelling of sedimentation-floating processes in magma chambers on micro and macro scales.
V04: LIPs and mafic dyke swarms of South America
Convenors: Wilson Texeira (wteixeir@usp.br), Richard Ernst (richard.ersnt@ernstgeosciences.com), Elson Oliveira (elson@ige.unicamp.br)
Continental flood basalts, volcanic passive margins, oceanic plateaux, mafic dyke swarms, as well as bimodal and dominantly felsic magmatism represent the largest known intraplate-type igneous episodes on Earth. The high-quality information content of Large Igneous Provinces (LIPs) record (precise ages and piercing points, trends, palaeomagnetic poles) is critical in sorting out supercontinent configurations. With the importance and potential of LIP studies in mind, this session welcomes presentations on all aspects of the Phanerozoic and Precambrian LIP record of South America, including assessment of the broader global geodynamic implications.
V06: Mantle plumes in the Atlantic Ocean
Convenor: Munir Humayun (humayun@magnet.fsu.edu)
This session aims to attract geologists, geochemists and geophysicists, conducting research on the mechanisms of plume generation, ridge-plume interactions, plume source compositions and plume melting dynamics, for the diverse variety of plumes encountered in the Atlantic Ocean basin. This session encourages submissions regarding physical or chemical studies that contribute to our understanding of plume generation, including the recycling of subducted slabs, or other sources of mantle heterogeneity expressed in oceanic island basalts (OIB), and processes involving the impact of OIB on the mid-oceanic ridge due to ridge-plume interactions.
V10: Understanding magmatism: from crystals to provinces
Convenors: Olivier Bachmann (bachmano@u.washington.edu), Guilherme Gualda (g.gualda@vanderbilt.edu), Josef Dufek (dufek@gatech.edu), Calvin Miller (calvin.miller@vanderbilt.edu)
Understanding magmatic systems requires combining information from a variety of disciplines (petrology, geochemistry, geophysics, geochronology), using a variety of approaches (from field work to modelling), and in a variety of scales (from individual crystals to entire provinces). This session aims to bring together researchers studying multiple aspects of magmatic systems. We are interested in (1) emphasising the relationship between plutonic and volcanic rocks, (2) using mineral compositions to record magmatic conditions, (3) unravelling the chronology of events, (4) using well-constrained modelling, and (5) exploring eruption triggers.
Includes the following fieldtrips:
Impact craters in basalts
Date: 14th-15th August
Basaltic impact craters are rare on Earth (although common in other solid planetary bodies). We will visit two impact craters: Vargeão and Vista Alegre, in Paraná and Santa Catarina states, with diameters of 13 and 9.5 km, respectively. This will provide a first-hand insight of the shock deformation features in basalt, especially for participants of the session "Impact Cratering on Solid Planets - Shocks on Basalt".
The sites are only a few hours from Iguazu.
ParanaMagmatic Province
Date: 3rd-7th August
Leaders: Leila Marques (leila@iag.usp.br), Antonio Jose Nardy (nardy@rc.unesp.br), Breno Waichel (breno@unioeste.br)
The opening of the South Atlantic was preceded by voluminous magmatism in Brazil and Africa, giving rise to the Paraná-Etendeka Magmatic Province, one of the largest igneous provinces of the world. In Brazil, the volcanic rocks were erupted into a Palaeozoic sedimentary basin (Paraná Basin) represented by flood basalts with minor intermediate and acid (rhyodacite/rhyolite) volcanics. The volcanism was also accompanied by significant intrusive magmatism, which gave rise to sills and three dyke swarms. In the field trip different volcanic rock-types will be observed, as well as several volcanic structures, such as lava lobes, pegmatoid segregations, pahoehoe lavas and peperites. The trip begins with the spectacular outcrops of the Florianópolis Dyke Swarm, belonging to the final stages of the magmatic activity. Then, several exposures of the lava piles will be visited, beginning with the first basaltic flows in contact with the aeolian sandstones of Botucatu Formation. We will then follow the sequence of lava flows upward in magnificent valleys where the entire pile of basaltic flows, and intertrap sandstones, can be recognised. The two types of acid volcanics, at the upper portions of the lava piles and representing the last stages of the volcanic activity, will also be examined. The trip will finish in Foz do Iguaçu City, which was built over basalts of Paraná Magmatic Province. Participants must arrive in Florianópolis on August 2nd. The field trip starts on August 3rd early in the morning. Interested participants can contact Leila Marques at leila@iag.usp.br. Preliminary cost estimate is U$ 1,000.00.The minimum number of participants is 15 and the maximum is 35.