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Doctoral thesis
English

Formation of a tonalitic batholith through sequential accretion of magma batches

Defense date2014-02-05
Abstract

This work presents a detailed geochemical study of the centre and north of the Adamello batholith located in the Italian Alps. It is the largest plutonic complex of the Alps since its length, oriented SW-NE, extends about 80 km with 670 km2 of rocks exposed at the current surface level by glacial and fluvial erosion. The Adamello, unlike other batholiths of the Alps, is located south of the Insubric line, and more specifically, is surrounded by two faults, the Tonale fault to the north, and the Giudicarie fault to the east. This intrusion was formed by magma accumulation after the subduction and collision of the European plate beneath the African plate. The duration of the magmatic activity was 10 Ma from the Eocene to Oligocene. Although the south of the batholith has been studied in more detail, only few data are available on the central and northern part of the Adamello which is characterized by a less heterogeneous petrographic and geochemistric composition. This study focuses on the evolved tonalites rocks of the complex, the aim is on the one hand to understand and quantify the magmatic processes occurring from the magma source extraction to its emplacement in the upper crust, and on the other hand to determine the cooling rate of magma once arrived at emplacement level.

eng
Keywords
  • Adamello
  • Zircon
  • U-Pb dating
  • Ar-Ar
  • Microprobe
Citation (ISO format)
SKOPELITIS, Alexandra. Formation of a tonalitic batholith through sequential accretion of magma batches. 2014. doi: 10.13097/archive-ouverte/unige:39303
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Creation07/07/2014 9:51:00 AM
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