Effect of chlorine on near-liquidus phase equilibria of an Fe–Mg-rich tholeiitic basalt
Effect of chlorine on near-liquidus phase equilibria of an Fe–Mg-rich tholeiitic basalt
复制标题
氯对富铁镁拉斑玄武岩近液相平衡的影响
DOI：
10.1007/s00410-014-1027-1
复制
发表时间：
2014
影响因子：
3.5
通讯作者：
A. Treiman
中科院分区：
文献类型：
--
作者：
J. Filiberto;R. Dasgupta;J. Gross;A. Treiman
摘要
Cl在玄武岩岩石成因中的重要性已得到公认，但其对玄武岩液相线结晶作用的限制却很少。为了量化氯在玄武岩系统中的作用，我们通过实验确定了合成富铁镁玄武岩的近液相线相关系，该玄武岩掺杂有0.0- 2.5wt%溶解氯，压力为0.7、1.1和1.5 GPa。结果已被参数化，并与以前的文献数据进行比较。Cl对矿物化学和液相线降低的影响取决于起始玄武岩成分。富SiO2，Al 2 O3-贫玄武岩的液相线凹陷测量是小于所观察到的玄武岩熔体贫硅和丰富的FeOT和Al 2 O3。Cl对橄榄石-斜方辉石-液体多重饱和压力的抑制作用似乎不随玄武质液体的起始组成而变化。这表明，Cl可能显着促进地球，火星和月球上的硅贫，富铁铝岩浆的产生。
Abstract
The importance of Cl in basalt petrogenesis has been recognized, yet constraints on its effect on liquidus crystallization of basalts are scarce. In order to quantify the role of Cl in basaltic systems, we have experimentally determined near-liquidus phase relations of a synthetic Fe–Mg-rich basalt, doped with 0.0–2.5 wt% dissolved Cl, at 0.7, 1.1, and 1.5 GPa. Results have been parameterized and compared with previous data from literature. The effect of Cl on mineral chemistry and liquidus depression is dependent on the starting basaltic composition. The liquidus depression measured for a SiO2-rich, Al2O3-poor basalt is smaller than that observed for a basaltic melt depleted in silica and enriched in FeOT and Al2O3. The effect of Cl on depression of the olivine–orthopyroxene–liquid multiple saturation pressure does not seem to vary with the starting composition of the basaltic liquid. This suggests that Cl may significantly promote the generation of silica-poor, Fe–Al-rich magmas in the Earth, Mars, and the Moon.
影响因子：
3.9
作者：
Baasner, A.;Schmidt, B. C.;Webb, S. L.
通讯作者：
Webb, S. L.
影响因子：
3.9
作者：
D. Neave;Gareth N. Fabbro;R. Herd;C. Petrone;M. Edmonds
通讯作者：
D. Neave;Gareth N. Fabbro;R. Herd;C. Petrone;M. Edmonds