Controls on the mineralogy of S-type volcanic and plutonic rocks
Controls on the mineralogy of S-type volcanic and plutonic rocks
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DOI：
10.1016/0024-4937(88)90005-9
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发表时间：
1988
期刊：
影响因子：
3.5
通讯作者：
J. Clemens;V. Wall
中科院分区：
文献类型：
--
作者：
J. Clemens;V. Wall
S式岩石远不是简单的“二云母”花岗岩，而是含有高度多样化的矿物组合。影响S式岩石矿物学的最重要的化学因素是过铝度、块状FeO+MgO、Mg(Mg+Fe)、K：Na：Ca和挥发分的逸度，如H2O、HF、H3BO3和O2。然而，决定矿物组合的不仅仅是初始熔体化学。结晶压力和温度是影响结晶性能的主要因素。随着岩浆的演化，P-T条件、挥发逸度和熔体化学发生变化，往往导致稳定矿物学的变化。许多S型花岗岩和硅质火山岩含有部分或全部重新平衡的矿物组合。对这些的认识可能会提供有关早期结晶条件和岩浆源区性质的重要信息。
Far from being simply “two-mica” granites, S-type rocks contain highly diverse mineral assemblages. The most important chemical factors influencing the mineralogy of an S-type rock are: peraluminosity, bulk FeO+ MgO, Mg (Mg+ Fe), K: Na: Ca, and the fugacities of volatile species such as H 2 O, HF, H 3 BO 3 and O 2. However, it is not just initial melt chemistry that determines the mineral assemblage. The pressure and temperature of crystallization exert major effects. As magmas evolve, the P-T conditions, volatile fugacities and melt chemistry change, often leading to changes in stable mineralogy. Many S-type granites and silicic volcanic rocks contain partly or completely re-equilibrated mineral assemblages. Recognition of these may provide important information about early crystallization conditions and the nature of the magma source terrains.