A red-corundum-bearing vein in the Rai–Iz ultramafic rocks, Polar Urals, Russia: the product of fluid activity in a subduction zone
A red-corundum-bearing vein in the Rai–Iz ultramafic rocks, Polar Urals, Russia: the product of fluid activity in a subduction zone
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俄罗斯极地乌拉尔 RaiâIz 超镁铁岩中的含红刚玉矿脉：俯冲带流体活动的产物
DOI：
10.1016/j.lithos.2018.09.025
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发表时间：
2018-11
期刊：
影响因子：
3.5
通讯作者：
Ren Y.F.
中科院分区：
文献类型：
--
作者：
Meng F.C.;Shmelev V.R;Kulikova K.V.;Ren Y.F.
地幔楔橄榄岩中的脉体记录了板片源熔体/流体的活动，是壳幔物质循环的反映。在俄罗斯乌拉尔极地的拉伊-伊兹超镁铁质岩中发现了一条含红锆石的脉。超镁铁岩为方辉橄榄岩和纯橄榄岩，含红刚玉岩为金云母、钠云母、奥长石、红刚玉和铬尖晶石。红刚玉以含92- 98wt%Al2O3和2- 7wt%Cr2O3的微晶或细粒形式出现。铬尖晶石具有46-78的Cr#值（[100Cr/（Cr + Al）]原子比）。奥长石的特征在于An值为20-30。金云母富含Ba（BaO = 0.8-2.7重量%），钠云母富含Sr（SrO = 0.8-2.3重量%）。锆石显示振荡环带，Th/U值<0.2，表明为流体结晶。锆石加权平均206 Pb/238 U年龄为382 ± 2 Ma，金云母40 Ar/39 Ar坪年龄为377 ± 3 Ma，表明含红云母脉形成于380 Ma。矿脉的产出和形成时代、矿脉矿物的结构和成分以及锆石εHf值（−11 ~+13）表明，矿脉是俯冲带流体与地幔楔橄榄岩相互作用的产物。
The veins in the mantle wedge peridotite can record the activity of slab-derived melt/fluid, which is the reflection of the material circulation between crust and mantle. A red-corundum-bearing vein is present in the Rai–Iz ultramafic rocks in the Polar Urals, Russia. The ultramafic rocks are harzburgite and dunite, and the red corundum-bearing rocks consist of phlogopite, paragonite, oligoclase, red corundum, and chromian spinel. Red corundum occurs as prophyroblasts or fine grains that contain 92–98 wt% Al2O3and 2–7 wt% Cr2O3. Chromian spinel has Cr# values ([100Cr/ (Cr + Al)] atomic ratio) of 46–78. Oligoclase is characterized by An values of 20–30. Phlogopite is Ba-rich (BaO = 0.8–2.7 wt%) and paragonite is Sr-rich (SrO = 0.8–2.3 wt%). Zircons from the oligoclasite show oscillatory zoning and Th/U values of <0.2, indicating crystallization from fluid. A zircon weighted-mean206Pb/238U age of 382 ± 2 Ma and a phlogopite40Ar/39Ar plateau age of 377 ± 3 Ma indicate that the red-corundum-bearing vein formed at 380 Ma. The occurrence and formation age of the vein, structure and composition of vein minerals, and zircon εHf values (−11 to +13) suggest that the vein was the product of interaction between a subduction-zone-derived fluid and mantle wedge peridotite.
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