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RESEARCH PROGRAM
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Research Units
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Scientific and education field classification
International Patent Classification
- HUMAN NECESSITIES
- SPORTS; GAMES; AMUSEMENTS
- MERRY-GO-ROUNDS; SWINGS; ROCKING-HORSES; CHUTES; SWITCHBACKS; SIMILAR DEVICES FOR PUBLIC AMUSEMENT
- SPORTS; GAMES; AMUSEMENTS
- PHYSICS
- MEASURING (counting G06M); TESTING
- INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (separating components of materials in general B01D, B01J, B03, B07; apparatus fully provided for in a single other subclass, see the relevant subclass e.g. B01L; measuring or testing processes other than immunoassay, involving enzymes or micro-organisms C12M, C12Q; investigation of foundation soil in situ E02D1/00; sensing humidity changes for compensating measurements of other variables or for compensating readings of instruments for variations in humidity, see G01D or the relevant subclass for the variable measured; testing or determining the properties of structures G01M; measuring or investigating electric or magnetic properties of materials G01R; systems or methods in general, using reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; determining sensivity, graininess, or density of photographic materials G03C5/02; testing component parts of nuclear reactors G21C17/00; [N: controlling or regulating non-electric variables G05D; measuring degree of ionisation of ionised gases, i.e. plasma H05H1/00A; testing electrographic developer properties G03G15/08H6])
- MEASURING (counting G06M); TESTING
Geographical classification
- Region: Umbria
Keywords
MANTLE HETEROGENEITY; GENESIS OF BASALTS; MAGMA MIXING; LENGTH SCALE OF COMPOSITIONAL HETEROGENEITY IN MAGMAS; CHAOS THEORY; FRACTAL GEOMETRY; EXPERIMENTAL PETROLOGY; INTRUSIVE ROCKS; EFFUSIVE ROCKSCHAOTIC DYNAMICS AND FRACTAL GEOMETRY IN THE GENESIS AND MIXING OF MAGMAS
Università degli Studi di PerugiaAbstract
Compositional heterogeneities strongly characterize all the life stages of magmatic systems from the genesis of basaltic magmas in a geochemically heterogeneous upper mantle to successive evolutionary stages where magmas derived from both a single heterogeneous source and different sources interact.The main goal of this research project is to study the processes acting during the genesis and evolution of magmas via magma mixing by analysing plutonic and volcanic rocks through a multidisciplinary approach involving petrology, geochemistry, and experimental petrology. Together with these classic petrologic techniques, also new methods of Chaos Theory and Fractal Geometry will be used. This approach will allow us to keep into account the non-linearity, the dependence upon initial conditions, and the scale-invariance of petrogenetic processes and, hence, to gain more in-depth knowledge about magmatic systems.
In detail, the project is mainly focused on:
i) understanding the nature of source regions and the length scale of upper mantle heterogeneities by focusing attention on OIB magmatism and by considering the compositional variability of basaltic melts from the length scale of oceans to single volcanoes;
ii) understanding the mechanisms acting during interaction of rheologically similar magmas by studying basaltic magmas generated by an heterogeneous mantle source and reconstructing the composition of end-members that were involved in the >>>
Principal Investigator
Giampiero POLI Università degli Studi di PERUGIAResearch Objectives
The main aim of this research project is the study of processes occurring during genesis and evolution via magma mixing of magmas using a multidisciplinary approach involving petrology, experimental petrology and geochemistry on selected and representative plutonic and volcanic rocks. Together with classic petrology, techniques based on Chaos Theory and Fractal Geometry will be used since these methods allow to keep into account the non-linearity, the variability connected to the initial conditions, and the scale invariance of magmatic processes.This project will focus on understanding of:
- type and scale of the compositional heterogeneity of the upper mantle, by studying the geochemical variability of Oceanic Island Basalts (OIB);
- mixing processes among basaltic magmas during migration from their source, by studying compositional transects on representative samples;
- the early stages of the intrusion of mafic magmas into felsic magma chambers and successive evolution of mixing processes in time, by studying both plutonic rocks and lavas characterized also by variable crystallinity, and by performing experimental petrology experiments.
Regarding magma genesis, we will focus on partial melting processes through the study of basaltic rocks, mainly of OIB-type strictly correlated in space and time, to evaluate nature and dimensional length scale of the distribution of the upper mantle heterogeneities. The conceptual model is the >>>
Timescale
24 monthsNational and international background
There is a plethora of evidence that magmatic systems display compositional heterogeneities at many length-scales and that these heterogeneities play a very important role in the petrogenesis of igneous rocks [e.g. 1,2]. The causes of these heterogeneities are related to several processes acting on different spatial and temporal scales. A first process that can strongly influence the degree of heterogeneity of a magmatic system is partial melting of a source rock (e.g. the upper mantle); such a process can lead to the production of magma volumes with different geochemical composition depending on the degree of melting and the extent of compositional heterogeneity of the source rock [e.g. 3,4]. Single magma volumes generated by this process can coalesce during their migration from the source region to produce magmatic masses of larger dimensions which are constituted by several interacting sub-systems with variable compositions [e.g. 5]. Another process that is likely to form compositionally heterogeneous magmatic masses is interaction between magmas derived by partial melting of different source rocks [e.g. mantle-derived magmas which interact with crustal anatectic magmas; e.g. 6,7].Recent studied have shown that the Earth mantle is highly heterogeneous in composition being constituted by regions having variable degrees of "fertility" which, potentially, can give basaltic melts with extremely different geochemical compositions. From a two layers upper mantle >>>
