Cooling histories of Apollo 15 quartz-normative basalts
Cooling histories of Apollo 15 quartz-normative basalts
复制标题
阿波罗 15 号石英标准玄武岩的冷却历史
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
D. Walker
中科院分区：
文献类型：
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作者：
T. Grove;D. Walker
玻璃斑岩15597的受控冷却速率研究被用来计算石英标准岩浆的物理性质以及阿波罗15石英标准玄武岩的冷却历史。QNb岩浆中的辉石斑晶在流动单元冷却过程中不会有明显的沉淀；这一行为与该套岩套成员之间发生的小程度化学差异是一致的。QNB的冷却历史有两种类型。玻璃斑岩经历了最初的缓慢冷却和快速冷却，粗粒微辉长岩经历了缓慢的近线性冷却历史。质地证据表明，月球玻璃斑岩在流的顶端附近结晶。据推测，这种冷却模式可能是由于流体内部继承了早期结晶的液体冷却所致。
Controlled cooling rate studies of vitrophyre 15597 are used to calculate the physical properties of a quartz-normative magma as well as cooling histories of Apollo 15 quartz-normative basalts (QNB). Pyroxene phenocrysts of a QNB magma do not settle appreciably during the cooling of the flow unit; this behavior is consistent with the small degree of chemical differentiation that occurred between members of the suite. Two types of cooling histories for QNB are discerned. The vitrophyres experienced initial slow cooling followed by rapid cooling, and the coarse-grained microgabbros underwent slow nearly linear cooling histories. Textural evidence suggests that lunar vitrophyres crystallized near the top of the flow. It is suggested that the pattern of cooling may have been caused by the chilling of liquids that inherited early crystals in the interior of the flow.