{'fraction_non_alphanumeric': 0.025730994152046785, 'fraction_numerical': 0.00935672514619883, 'mean_word_length': 5.534351145038168, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY A geochemical and isotopic (Nd-Pb) comparison of volcanic rocks erupted during the last 3,550 yrs. B.P. of interplinian activity of Somma- Vesuvius volcano, Southern Italy

Detailed stratigraphic sampling of formations from Somma-Vesuvius (Southern Italy) volcano complex erupted during the last 3550 years of inteplinian activity provide a framework for comprehensive chemical analyses and isotopic studies. The evolution of majorand trace-element abundances of these rocks suggest that fractional crystallization together with crustal assimilation are only a partial explanation of the complex processes occurring in the magma chamber. Our Nd and Pb isotopic data point to complex processes involving contributions from heterogeneus lithosphere, assimilation of continental crust, and magma mixing.