Magmatic Processes at Oceanic Spreading Centers

与大洋中脊岩浆作用有关的一些主要问题有：沿轴的成分变化、不同岩浆室补给率的影响、进给器的分布、连续岩浆室的对流分配、构造分段、分馏、混合和污染的趋势。这项研究将讨论可变补给和/或空间变化的边界条件在岩浆室化学分配产生中的作用。其目的是确定与结晶和对流分馏有关的时间和长度尺度，其中结晶完全与围岩中的热传递制度和实际成分的相图相耦合。这涉及到通过SILMIN程序将输运方程直接耦合到系统的相关系。另一个目标是在边界条件适当变化的情况下启动对流系统的实验室实验。要解决的问题包括：(1)补给对流将如何影响对流？(2)对流如何影响结晶和分馏？(3)对流在多大程度上将腔体划分为具有不同化学演化的区域？(4)水热对流对腔体的影响是什么？

There are a number of major issues relative to mid-ocean ridge magmatism; such as the along-axis compositional variations, the effects of variable magma chamber recharge rates, the distribution of feeders, convective partitioning of a contiguous chamber, tectonic segmentation, trends in fractionation, mixing, and contamination. This study will address the role of variable recharge and/or spatially varying boundary conditions in generating chemical partitioning of a magma chamber. The objective is to determine the time and length scales associated with crystal and convective fractionation where the crystallization is fully coupled to the heat transfer regimes in the wallrock and to the phase diagram for real compositions. This involves the coupling of the transport equations directly to the phase relations of the system through the code SILMIN. An additional objective is to initiate laboratory experiments of convective regimes with appropriately varying boundary conditions. Questions to be addressed include: (1) How will convection be influenced by recharge? (2) How is crystallization and fractionation influenced by convection? (3) To what degree does convection partition the chamber into domains that have difference chemical evolutions? (4) What is the effect of hydrothermal convection on the chamber?