With this session we offer a platform for contributions using geochronological methods for resolving processes in ancient and modern magmatic systems, from deep crust to the surface, from melt accumulation, fractional crystallisation and melting in deep-seated reservois, to melt and crystal transport into the middle and upper crust, processes at the origin of volcanic eruptions, as well as all temporal aspects of metal transport, precipitation and crystallization in ore deposits at lithosphere-scale.

Magma chemistry sampled in plutonic and volcanic rocks (including their crystal cargoes) reflects combinations of processes that operate in their sources (e.g. metasomatism and tapping of various mantle components) as well as during differentiation in the crust (e.g. fractional crystallization, crustal assimilation, mixing/mingling, replenishment of magma reservoirs and chambers, and crustal melting). The fundamental questions addressed by this session concern how igneous systems operate in different tectonic settings and the principal controls on primary, parental and derivative magma compositions. This session thus invites contributions focussing on the generation and differentiation of magmas in the mantle and the crust. We particularly encourage reports on field studies, petrology, geochemistry, experimental petrology, and thermodynamic and geochemical modelling.

Public information:
Dear colleagues,

Please observe that the talks in session GMPV4.2 begin at 09:00 (and not at 08:30 as previously advertised).

Hope to see you there!
On behalf of the convener team.

The Oman Drilling Project (OmanDP; 2016-2018) has recovered 3200 m of diamond drillcore that sample three intervals within the gabbroic lower crust, the crust-mantle transition, partially serpentinised peridotite undergoing active alteration, and the transition from the mantle into the underlying metamorphic sole of the Samail ophiolite in Oman, arguably the best-preserved ophiolite. Most of the boreholes have been geophysically logged and the cores have undergone extensive IODP standard core description onboard the DV Chikyu, supplemented with X-ray CT and high resolution infrared scanning of the entire core. These cores and boreholes can be used to investigate the full spectrum of processes operating during the formation and modification of oceanic crust and shallow mantle. These processes involve mass and energy transfer between all the major components of the Earth system (the mantle, the crust, the hydrosphere, the atmosphere and the biosphere) and occur over a broad range of temperatures, depths and tectonic settings. In this session, we invite abstracts relating to the Oman Drilling Project including core analysis, geophysical logging and microbial studies as well as studies related to the Samail ophiolite and the oceanic lithosphere in general.