Garnet-clinopyroxene and clinopyroxene geothermobarometry of deep mantle and crust eclogites and peridotites

被引：23
|
作者：
Simakov, S. K. [1 ]
机构：
[1] St Petersburg State Univ, Dept Geol, St Petersburg 199034, Russia
来源：
LITHOS | 2008年 / 106卷 / 1-2期
关键词：
Geothermobarometry; Eclogite; Peridotite; Upper mantle; Continental crust;
D O I：
10.1016/j.lithos.2008.06.013
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：
Eclogite is one of the major types of xenoliths in kimberlite. An investigation of such xenoliths provides important constraints on the distribution of P and T within the upper mantle and its chemical composition. Garnet-clinopyroxene and clinopyroxene barometers are proposed for mantle eclogites and peridotites on the basis of CaTs solubility in clinopyroxene coexisting with garnet. Such barometers permit estimation of P-T conditions for eclogite and peridotite garnet-clinopyroxene assemblages, including those involving omphacite and Cr-diopside pyroxenes for the ranges 700 <= T <= 2100 degrees C and 1.5 <= P <= 22 GPa. The barometers were used to determine formation conditions of eclogitic and peridotitic inclusions in diamonds, diamond-bearing, diamond-graphite-bearing and diamond-free eclogites and peridotites from kimberlite pipes and metamorphic complexes. (C) 2008 Elsevier B.V. All rights reserved.
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页码：125 / 136
页数：12
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