THE TRACE-ELEMENT VARIATIONS IN CLINOPYROXENES FROM SPINEL PERIDOTITE XENOLITHS FROM SOUTHWEST POLAND

被引：44
作者：
BLUSZTAJN, J
SHIMIZU, N
机构：
[1] Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole
来源：
CHEMICAL GEOLOGY | 1994年 / 111卷 / 1-4期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1016/0009-2541(94)90091-4
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：
Major- and trace-element content, and Sr- and Nd-isotopic composition are reported for clinopyroxenes from anhydrous spinel peridotites (SW Poland). LREE enrichment which occurs in ah samples is decoupled from relatively high Nd-143/Nd-144 ratios (0.51286-0.51291), indicating that mantle metasomatism took place relatively recently. REE and HFSE (high-field strength element) abundances show marked variation but, interestingly, correlate with each other: samples with U-shaped REE patterns have Ti/Zr> 700; samples with a REE concave-downward pattern have Ti/Zr of 20-200 and samples with a REE concave-upward pattern are characterized by Ti/Zr of 2-40. We suggest that trace-element enrichment is the result of interaction between basaltic melt migrating through the veins and contiguous wall-rock peridotites. Modal composition and trace-element characteristics of samples with U-shaped REE patterns probably reflect interaction of depleted peridotite residue with carbonatite melt.
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页码：227 / 243
页数：17
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