Descrizione del progetto
I difetti reticolari del quarzo potrebbero rivelare i processi di formazione delle rocce
L’analisi della provenienza aiuta i geologi a individuare la regione da cui hanno origine i campioni di sedimenti. Il quarzo è tra i più diffusi minerali in grado di formare rocce presenti sulla Terra. I cristalli di questo composto contengono una grande quantità di difetti puntiformi, che a volte vengono utilizzati per datare i sedimenti quaternari; tuttavia, la comprensione relativa alla formazione e alle dinamiche di tali difetti è tuttora limitata. L’obiettivo del progetto PROGRESS, finanziato dall’UE, è quello di dimostrare che i difetti puntiformi nel quarzo possono fornire la prova del metamorfismo delle rocce e rivelarne i processi di degradazione meteorica, trasporto e riciclaggio. Per studiare questi difetti puntiformi, i ricercatori metteranno in atto una combinazione di tecniche microscopiche e di metodi basati sulla luminescenza.
Obiettivo
Quantitative provenance analysis studies are instrumental in understanding the tectonic and climatic processes that are shaping Earth`s landscape. Although the most abundant mineral in the sedimentary system is quartz, almost all studies in provenance analysis investigate accessory minerals. Quartz crystals contain a vast number of point defects, intrinsic or due to impurities. Although our understanding on the formation and dynamics of these defects is far from complete, a few of these defects in quartz are used for dating Quaternary sediments by luminescence (thermoluminescence (TL) or optically stimulated luminescence (OSL)) or by electron spin resonance (ESR). PROGRESS aims at proving that point defects in quartz have also the capacity to carry genetic information and their modifications can provide evidence for antiquity, metamorphism (or lack thereof) as well as knowledge on weathering, transport, or recycling. This information can be unravelled by ESR and luminescence methods in combination with microscopic techniques such as scanning electron microscopy coupled with cathodoluminescence (CL) wavelength resolved spectroscopy. To understand changes that are occurring at atomic level in quartz in nature in geological time, PROGRESS will investigate quartz grains extracted from independently dated old to young quartz-bearing continental crustal sources, metamorphosed rocks versus their unmetamorphosed equivalents, fresh versus highly weathered samples, as well as intrusive versus volcanic rocks, besides conducting experiments in laboratory environments. To tackle nature`s complexity during sediment movement in space and time the effect of physical and chemical changes that occur during transport of quartz grains will be investigated by the study of river sediments that drain different lithologies. These investigations will allow a simple quartz based fingerprinting method to be developed, that will have a significant impact on quantitative provenance studies.
Campo scientifico
Programma(i)
- HORIZON.1.1 - European Research Council (ERC) Main Programme
Argomento(i)
Meccanismo di finanziamento
ERC - Support for frontier research (ERC)Istituzione ospitante
400084 Cluj Napoca
Romania