کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4715653 1638652 2016 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Paleozoic metasomatism at the origin of Mediterranean ultrapotassic magmas: Constraints from time-dependent geochemistry of Colli Albani volcanic products (Central Italy)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Paleozoic metasomatism at the origin of Mediterranean ultrapotassic magmas: Constraints from time-dependent geochemistry of Colli Albani volcanic products (Central Italy)
چکیده انگلیسی


• Phlogopite-bearing mantle characterized by local isotopic disequilibrium
• Disequilibrium melting process operating at the local scale in the metasomatized mantle
• Timing of the mantle metasomatism at the origin of the ultrapotassic quaternary magmatism in the Mediterranean area

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Lithos - Volume 244, 1 February 2016, Pages 151–164
نویسندگان
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