Solidification Front Instability and Silicic Chaos in Basaltic Sills

玄武岩基岩中的凝固前沿不稳定和硅质混沌

• 批准号: 9117576
• 负责人: Bruce Marsh
• 金额: $ 28.78万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-03-01 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117576&HistoricalAwards=false
• 关键词: Solidification; Front; Instability; Silicic; Chaos

Compositionally disparate or bimodal magmas simultaneously occupying the same chamber have been inferred since the very beginnings of igneous petrology. This award supports a series of field-based investigations, centered around the diabase sills of Antarctica, some of which are perhaps the best examples of bimodal fractionation (solidification front instability-ıSFI!), and augmented by experimental and analytical investigations, to delineate the physics and chemistry of SFI. Similar, complementary field studies will also be undertaken at the Stott Mountain, Oregon, and Zora, Pennsylvania involving, silicic lenses in gabbro and voluminous bulbous granophyre at their upper contact of a large diabase sheet.

自火成岩岩石学诞生以来，人们就推断出成分不同的岩浆或同时占据同一洞穴的双峰岩浆。该奖项支持以南极洲辉绿岩岩床为中心的一系列野外调查，其中一些可能是双峰分馏(固化前沿不稳定性-ıSFI！)的最佳例子，并通过实验和分析研究来描述SFI的物理和化学。在俄勒冈州的斯托特山和宾夕法尼亚州的佐拉也将进行类似的互补性实地研究，涉及辉长岩中的硅质透镜和大型辉绿岩上接触的巨大球茎花岗岩。