Melt-peridotite reaction recorded in the chemistry of spinel and melt inclusions in basalt from 43°N, Mid-Atlantic Ridge

被引：23
|
作者：
Kamenetsky, V
Crawford, AJ
机构：
[1] Univ Tasmania, Sch Earth Sci, Hobart, Tas 7001, Australia
[2] Univ Tasmania, Ctr Ore Deposit Res, Hobart, Tas 7001, Australia
来源：
EARTH AND PLANETARY SCIENCE LETTERS | 1998年 / 164卷 / 1-2期
基金：
澳大利亚研究理事会;
关键词：
mid-ocean ridge basalts; melts; inclusions; spinel; peridotites; petrology;
D O I：
10.1016/S0012-821X(98)00226-X
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：
Compositions of spinel and grassy melt inclusions in primitive olivine (FO89.3-91) from basalt AII32 D11-177 at 43 degrees N, Mid-Atlantic Ridge fall into two principal groups. The dominant (similar to 90%) Group-I spinel and melt inclusions have typical MORE compositions. In contrast, Group-II. Cr-spinels are strongly enriched in TiO2 (2.6-4.1 wt%), and Group-II melt inclusions show significant enrichment in SiO2 (54.6-58.4 wt%), TiO2, Na2O and K2O, whereas their CaO contents (9.3-11.1 wt%) are unusually low. Group-II melts are also remarkable in crystallizing high-Mg orthopyroxene (Mg# 91). These mineral associations and melt compositions are unusual for MORE, and are interpreted to result from interaction between MORE-like melts and harzburgitic peridotite at low pressure. (C) 1998 Elsevier Science B.V. All rights reserved.
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页码：345 / 352
页数：8
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