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Radiometric methods in geological reconstruction, in the prospecting of georesources and evaluation of hazard

Puccini, Antonio (2012) Radiometric methods in geological reconstruction, in the prospecting of georesources and evaluation of hazard. Doctoral Thesis.

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Abstract

This study deals with a in-situ radioactivity measurements in the rocks with 3 main objectives:
1) Assessment of hazards resulting by the use of granitoid rocks as building materials. Based on the specific activities (expressed as Bq kg-1) measured with gamma-ray spectrometer, we have estimates the Activity Concentration Index (I). The (I) values in these rocks vary between from 0,73±0,07 in Grigio Malaga to 1,04±0,05 in Rosa Cinzia.
2) The measurement of 40K, 238U and 232Th performed according to the objective 1) revealed that portable gamma-ray spectrometer is a powerful tool in survey and mapping of intrusive complexes. Two study cases were considered: Buddusò and Arzachena plutons and their surrounding intrusion. These innovative tests show that the portable spectrometer proved high efficacy in real time geochemical discrimination of single intrusion.
3) Applied a stochastic-deterministic approach to simulate the Variscan one-dimension geotherm at c.a. 350 Ma and c.a. 300 Ma. Three main sources would have contributed to the thermal budget of the crust: Radiogenic heat production; Moho heat flow and Viscous shear heating. We have collected a large number of thermo-barometric constraints, at 350 Ma and 300 Ma, to compare the geotherm built with the P-T-t path. Results support a radiogenic contribute joined to basal flow enhanced by crustal delamination.

Item Type:Doctoral Thesis
ID Code:6742
Contributors:Oggiano, Giacomo
Publisher:Università degli studi di Sassari
Uncontrolled Keywords:Natural radioactivity, activity concentration index, thermal budget, portable gamma-ray spectrometer, Sardinian variscan crust
Subjects:Area 04 - Scienze della terra > GEO/09 Georisorse minerarie e applicazioni mineralogico- petrografiche per l'ambiente ed i beni culturali
Divisions:001 Università di Sassari > 01 Dipartimenti > Zoologia e genetica evoluzionistica
Cicli, scuole e corsi:Ciclo 24 > Scuole > Scienze della natura e delle sue risorse > Scienza e tecnologia dei minerali e delle rocce di interesse industriale
Deposited On:28 Mar 2012 10:53

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