High pressure trace element partitioning between clinopyroxene and alkali basaltic melts

被引:22
作者
Bonechi, Barbara [1 ]
Perinelli, Cristina [1 ]
Gaeta, Mario [1 ]
Fabbrizio, Alessandro [2 ]
Petrelli, Maurizio [3 ]
Strnad, Ladislav [4 ]
机构
[1] Sapienza Univ Roma, Dipartimento Sci Terra, Ple Aldo Moro 5, I-00185 Rome, Italy
[2] Charles Univ Prague, Inst Petr & Struct Geol, Fac Sci, Albertov 6, Prague 12843, Czech Republic
[3] Univ Perugia, Dept Phys & Geol, I-06100 Perugia, Italy
[4] Charles Univ Prague, Labs Geol Inst, Albertov 6, CZ-12843 Prague 2, Czech Republic
关键词
Clinopyroxene; Trace element partition coefficient; Lattice strain model; Order-disorder crystal growth; Fractional crystallization; RARE-EARTH-ELEMENTS; NEAPOLITAN YELLOW TUFF; HIGH-FIELD-STRENGTH; LOW-CA PYROXENE; LASER-ABLATION; CAMPI-FLEGREI; CAMPANIAN IGNIMBRITE; MAGMATIC SYSTEMS; EXPERIMENTAL CONSTRAINTS; PLAGIOCLASE FELDSPAR;
D O I
10.1016/j.gca.2021.04.023
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We present new experimental data on major and trace element partition coefficients (D) between clinopyroxene and a K-basaltic melt from Procida Island (Campi Flegrei Volcanic District, south Italy). Time-series experiments were conducted at 0.8 GPa and 1080-1250 degrees C aiming to investigate the role of the crystallization kinetics on trace elements partitioning behaviour at a pressure relevant for deep magmatic reservoirs. Results indicate that large ion lithophile elements (LILE) are incompatible (e.g., D-Sr <= 0.15), light rare elements (LREE; e.g., D-La <= 0.20) are always more incompatible than heavy rare elements (HREE), which in some cases result to be compatible with clinopyroxene (e.g., Due D-Dy = 1.40); high field strength elements (HFSE) are generally incompatible (D-HFSE <= 0.8), while transition elements (TE) range from slightly incompatible (e.g., D-V = 0.6) to highly compatible (e.g., D-Cr = 63). The calculated D values for LILEs, REEs, HFSEs, and TEs tend to decrease with the increase of temperature and to increase with increasing tetrahedrally-coordinated aluminium content, in agreement with the previous studies. Moreover, we observed the influence of the growth rate on the partition coefficients, with the highest D-REE values calculated in the runs with the highest growth rate (similar to 10(-7) cm s(-1)), due to the less efficient rejection of incompatible elements during rapid crystal growth, that in this study is not linked to disequilibrium conditions, but to the presence of pre-existing nuclei. Additionally, the apparent increase in DREE values with time observed in some runs is not referable to a change in time but rather to the different degrees of polymerization, expressed as the ratios NBO/T of these melts, strictly related to a loss of Fe occurred during the experiments, and thus to a different melt viscosity. Finally, the application of the experimental clinopyroxene-melt partition coefficients highlights that the deepest step of the magmatic differentiation in the Campi Flegrei Volcanic District is represented by the fractionation of about 20-30% of a clinopyroxenitic mineral assemblage from a basaltic parental magma. (C) 2021 Elsevier Ltd. All rights reserved.
引用
收藏
页码:282 / 305
页数:24
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