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首页> 外文期刊>Contributions to Mineralogy and Petrology >Experimental calibration of Forsterite-Anorthite-Ca-Tschermak-Enstatite (FACE) geobarometer for mantle peridotites
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Experimental calibration of Forsterite-Anorthite-Ca-Tschermak-Enstatite (FACE) geobarometer for mantle peridotites

机译：用于地幔阶层的Forsterite-Anorthite-Ca-Tschermak-enstatite（面部）地理位清的实验校准

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The crystallization of plagioclase-bearing assemblages in mantle rocks is witness of mantle exhumation at shallow depth. Previous experimental works on peridotites have found systematic compositional variations in coexisting minerals at decreasing pressure within the plagioclase stability field. In this experimental study we present new constraints on the stability of plagioclase as a function of different Na2O/CaO bulk ratios, and we present a new geobarometer for mantle rocks. Experiments have been performed in a single-stage piston cylinder at 5-10 kbar, 1050-1150 degrees C at nominally anhydrous conditions using seeded gels of peridotite compositions (Na2O/CaO = 0.08-0.13; X-Cr = Cr/(Cr + Al) = 0.07-0.10) as starting materials. As expected, the increase of the bulk Na2O/CaO ratio extends the plagioclase stability to higher pressure; in the studied high-Na fertile lherzolite (HNa-FLZ), the plagioclase-spinel transition occurs at 1100 degrees C between 9 and 10 kbar; in a fertile lherzolite (FLZ) with Na2O/CaO = 0.08, it occurs between 8 and 9 kbar at 1100 degrees C. This study provides, together with previous experimental results, a consistent database, covering a wide range of P-T conditions (3-9 kbar, 1000-1150 degrees C) and variable bulk compositions to be used to define and calibrate a geobarometer for plagioclase-bearing mantle rocks. The pressure sensitive equilibrium:
机译：在浅深度下，搭桥岩石中含有普拉基酶轴承组件的结晶是浅层倾向的搭桥。以前在恒星上的实验工程发现在普通粘接酶稳定场内的压力下减小的压力下的共存矿物质的系统组成变化。在该实验研究中，我们对Plagioclase的稳定性作为不同Na2O / CaO大量比率的函数来提出新的限制，我们为地幔岩提供了一种新的地质仪。在5-10kbar的单级活塞缸中在一个单级活塞缸中进行了实验，在名义上是无水条件下使用恒星组合物的种子凝胶（Na 2 O / CaO = 0.08-0.13; X-Cr = Cr /（Cr + Al）= 0.07-0.10）作为起始材料。如所预期的那样，散装Na 2 O / CaO比的增加将Plagioclase稳定性延伸到更高的压力;在研究的高Na肥沃的LherzoLite（HNA-FLZ）中，Plagioclase - 尖晶石过渡发生在1100℃的9-10kbar之间;在具有Na2O / CaO = 0.08的肥沃的Lherzole（FLZ）中，它在1100℃下发生在8和9 kbar之间。该研究与先前的实验结果一起提供一致的数据库，覆盖各种PT条件（3- 9 kbar，1000-1150℃）和可变的块状组合物用于定义和校准用于Plagioclase携带的地幔岩石的地质仪。压敏平衡：

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