Publication Date:
2021-05-12
Description:
The major processes that control the genesis of potassic volcanic rocks, like the timing of multi-stage mantle metasomatism, remain largely unclear. In an attempt to clarify the timing of the metasomatic process, a detailed geochronologic and geochemical study has been conducted on the ultrapotassic rocks of the Colli Albani Volcanic
District (Central Italy). New 40Ar/39Ar data coupled with literature and newly performed 87Sr/86Sr, 143Nd/144Nd
and chemical data allow us to precisely delineate the time-dependent geochemical variations of the magmas
erupted at the Colli Albani Volcanic District and to better define mantle source processes responsible for their genesis. The temporal geochemical variations observed in the Colli Albani magmas indicate that: i) the ultrapotassic
magmas originated from a metasomatized mantle source in which phlogopite is the potassium-bearing phase;
ii) the partial melting of the mantle source involved mainly phlogopite and clinopyroxene (±olivine), whereas
the role of accessory phases was less significant; and iii) the metasomatic process that led to the formation of
the phlogopite in the mantle can be reasonably related to events that have occurred during the Paleozoic Era
Description:
Published
Description:
151-164
Description:
2V. Struttura e sistema di alimentazione dei vulcani
Description:
3V. Proprietà chimico-fisiche dei magmi e dei prodotti vulcanici
Description:
4V. Processi pre-eruttivi
Description:
JCR Journal
Keywords:
Mantle metasomatism
;
Phlogopite
;
Ultrapotassic magmas
;
Colli Albani Volcanic District
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Permalink
