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Westerman, D. S.
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Westerman, D. S.
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- PublicationRestrictedIntroduction: LASI III—Magma pulses and sheets in tabular intrusions(2010-06)
; ; ; ; ;Rocchi, S.; Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy ;Dini, A.; Istituto di Geoscienze e Georisorse, CNR Pisa, Pisa, Italy ;Mazzarini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Westerman, D. S.; Department of Geology, Norwich University, Northfield, Vermont, USA; ; ; The origins of granites and intrusive rocks have been widely discussed for a couple of centuries, and the way volcanoes work and their magma forms have attracted scientists, naturalists, and laymen since the dawn of humankind. However, shallow igneous intrusions, representing the obvious link between the hidden kingdom of Pluto and the fiery realm of Vulcanus, have been partly overlooked, leading to some lack of communication between “plutonic” and “volcanic” researchers. An effort devoted to heal this breach has been contributed to by the establishment of the LASI conferences (named after laccolith and sill, the main types of shallow igneous intrusions).181 24 - PublicationOpen AccessThe intrusive complexof the Island of Giglio: geomagnetic characteristics of plutonic facies with low susceptibility contrast(1998-08)
; ; ; ; ; ; ; ;Faggioni, O.; Istituto di Geofisica Marina, Consorzio Universitario della Spezia, Universitá di Pisa, La Spezia, Italy ;Westerman, D.; Department of Geology, Norwich University, Northfield, VT, U.S.A. ;Innocenti, F.; Istituto di Geofisica Marina, Consorzio Universitario della Spezia, Universitá di Pisa, La Spezia, Italy ;Beverini, N.; Istituto di Geofisica Marina, Consorzio Universitario della Spezia, Universitá di Pisa, La Spezia, Italy ;Carmisciano, C.; Istituto di Geofisica Marina, Consorzio Universitario della Spezia, Universitá di Pisa, La Spezia, Italy ;Cavallini, R.; Istituto di Geofisica Marina, Consorzio Universitario della Spezia, Universitá di Pisa, La Spezia, Italy ;Dini, A.; Dipartimento di Scienze della Terra, Universitá di Pisa, Italy; ; ; ; ; ; Two main plutonic facies characterize the intrusive complex of the Island of Giglio, and the trend of their contact at depth has been modelled using a 2D½ analysis based on a detailed geomagnetic survey in order to verify the geological hypothesis of the subsurface geometry of this contact. The magnetic anomaly connected with the discontinuity is quite low, due to the small difference between the magnetic susceptibilities of the two granitic facies. Development of this model of inversion of the magnetic field, which is in good agreement with the geological interpretation, was made possible by: 1) accurate control of the geomagnetic time variations and consequent temporal reduction, 2) a very low level of the artificial magnetic noise, 3) high density of the magnetic survey, 4) detailed knowledge of the mapped geologic contact between facies and of their petrologic characteristics, and 5) direct local measurements of the magnetic susceptibilities of the key lithologies. The model shows the trends of the geological contact, as projected in three E-W sections, that dips eastward in the range between 210 and 540, supporting the geologic hypothesis that the Pietrabona facies represents an external shell of the shallowly emplaced Giglio monzogranite intrusion.228 616 - PublicationOpen AccessThe geomagnetic model of the Mount Capanne pluton (Elba Island)(2001-09-26)
; ; ; ; ; ; ; ;Faggioni, O.; Istituto di Geofisica Marina - CUNISPE ;Innocenti, F.; UNIPI ;Beverini, N.; UNIPI ;Carmisciano, C.; Istituto di Geofisica Marina - CUNISPE ;Marchisio, M.; UNIPI ;Stefanelli, P.; Istituto di Geofisica Marina - CUNISPE ;Westerman, D.; Nortwich University, Northfield, VT, USA; ; ; ; ; ; We show the 2.5 geomagnetic model of the granitic pluton of West Elba Island. The model is obtained by the TaE thecnique interpretation of the geomagnetic anomaly field....184 84