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Ice-VII inclusions in diamonds: Evidence for aqueous fluid in Earth’s deep mantle
Science ( IF 56.9 ) Pub Date : 2018-03-08 , DOI: 10.1126/science.aao3030
O. Tschauner 1 , S. Huang 1 , E. Greenberg 2 , V. B. Prakapenka 2 , C. Ma 3 , G. R. Rossman 3 , A. H. Shen 4 , D. Zhang 2, 5 , M. Newville 2 , A. Lanzirotti 2 , K. Tait 6
Affiliation  

Encapsulating Earth's deep water filter Small inclusions in diamonds brought up from the mantle provide valuable clues to the mineralogy and chemistry of parts of Earth that we cannot otherwise sample. Tschauner et al. found inclusions of the high-pressure form of water called ice-VII in diamonds sourced from between 410 and 660 km depth, the part of the mantle known as the transition zone. The transition zone is a region where the stable minerals have high water storage capacity. The inclusions suggest that local aqueous pockets form at the transition zone boundary owing to the release of chemically bound water as rock cycles in and out of this region. Science, this issue p. 1136 The presence of ice-VII in diamond inclusions requires regions of the mantle with a free aqueous phase. Water-rich regions in Earth’s deeper mantle are suspected to play a key role in the global water budget and the mobility of heat-generating elements. We show that ice-VII occurs as inclusions in natural diamond and serves as an indicator for such water-rich regions. Ice-VII, the residue of aqueous fluid present during growth of diamond, crystallizes upon ascent of the host diamonds but remains at pressures as high as 24 gigapascals; it is now recognized as a mineral by the International Mineralogical Association. In particular, ice-VII in diamonds points toward fluid-rich locations in the upper transition zone and around the 660-kilometer boundary.

中文翻译:

钻石中的 Ice-VII 内含物:地球深部地幔中含水流体的证据

包裹地球的深水过滤器从地幔带出的钻石中的小内含物为我们无法采样的地球部分的矿物学和化学提供了宝贵的线索。Tschauner 等人。在来自 410 至 660 公里深度的钻石中发现了称为冰-VII 的高压形式的水的包裹体,该部分地幔被称为过渡带。过渡带是稳定矿物具有高储水能力的区域。包裹体表明,由于随着岩石循环进出该区域,化学结合水的释放,在过渡带边界处形成了局部含水袋。科学,这个问题 p。1136 金刚石包裹体中冰-VII 的存在需要地幔区域具有游离水相。地球更深地幔中的富含水的区域被怀疑在全球水收支和发热元素的流动性中起着关键作用。我们表明,冰-VII 以天然钻石中的内含物形式出现,并作为此类富水地区的指标。Ice-VII 是钻石生长过程中存在的含水流体残留物,在主钻石上升时结晶,但仍处于高达 24 吉帕斯卡的压力下;它现在被国际矿物学协会认定为一种矿物。特别是,钻石中的冰 VII 指向上部过渡区和 660 公里边界附近的富含流体的位置。我们表明,冰-VII 以天然钻石中的内含物形式出现,并作为此类富水地区的指标。Ice-VII 是钻石生长过程中存在的含水流体残留物,在主钻石上升时结晶,但仍处于高达 24 吉帕斯卡的压力下;它现在被国际矿物学协会认定为一种矿物。特别是,钻石中的冰 VII 指向上部过渡区和 660 公里边界附近的富含流体的位置。我们表明,冰-VII 以天然钻石中的内含物形式出现,并作为此类富水地区的指标。Ice-VII 是钻石生长过程中存在的含水流体残留物,在主钻石上升时结晶,但仍处于高达 24 吉帕斯卡的压力下;它现在被国际矿物学协会认定为一种矿物。特别是,钻石中的冰 VII 指向上部过渡区和 660 公里边界附近的富含流体的位置。
更新日期:2018-03-08
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