Mantle-slab interaction and redox mechanism of diamond formation

被引：167
作者：
Palyanov, Yuri N. [1 ,2 ]
Bataleva, Yuliya V. [1 ,2 ]
Sokol, Alexander G. [1 ,2 ]
Borzdov, Yuri M. [1 ]
Kupriyanov, Igor N. [1 ]
Reutsky, Vadim N. [1 ]
Sobolev, Nikolai V. [1 ]
机构：
[1] Russian Acad Sci, VS Sobolev Inst Geol & Mineral, Siberian Branch, Novosibirsk 630090, Russia
[2] Novosibirsk State Univ, Dept Geol & Geophys, Novosibirsk 630090, Russia
来源：
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2013年 / 110卷 / 51期
基金：
俄罗斯基础研究基金会;
关键词：
carbonate-iron interaction; high-pressure experiment; mantle mineralogy; deep carbon cycle; DEEP CARBON-CYCLE; HIGH-PRESSURE; OXYGEN FUGACITY; FIBROUS DIAMONDS; CRYSTAL-GROWTH; EARTHS MANTLE; INCLUSIONS; MELTS; IRON; METAL;
D O I：
10.1073/pnas.1313340110
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Subduction tectonics imposes an important role in the evolution of the interior of the Earth and its global carbon cycle; however, the mechanism of the mantle-slab interaction remains unclear. Here, we demonstrate the results of high-pressure redox-gradient experiments on the interactions between Mg-Ca-carbonate and metallic iron, modeling the processes at the mantle-slab boundary; thereby, we present mechanisms of diamond formation both ahead of and behind the redox front. It is determined that, at oxidized conditions, a low-temperature Ca-rich carbonate melt is generated. This melt acts as both the carbon source and crystallization medium for diamond, whereas at reduced conditions, diamond crystallizes only from the Fe-C melt. The redox mechanism revealed in this study is used to explain the contrasting heterogeneity of natural diamonds, as seen in the composition of inclusions, carbon isotopic composition, and nitrogen impurity content.
引用
收藏
页码：20408 / 20413
页数：6
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