Collaborative Research: The Boron Budget in High-Grade Pelitic Metamorphic Rocks: How, When and Where Does the Boron Go?

9526403 Grew拟议的研究是研究某些硼载体的矿物学和岩石学，以评估它们在高级变质作用、混合作用和深熔作用中对硼行为的作用。 待研究的载体包括缅因州西部变岩中的电气石、白云母、硅线石、角闪石、镁橄榄石和韦丁石。 将特别强调评估水流体和重熔熔体在去除电气石分解释放的硼中的作用。 用电子探针测定主量元素组成，用穆斯堡尔谱学测定Fe+2和Fe+3，用铀萃取法测定整体样品中的H，用15 N反应测定H分带，用离子探针测定整体和微观B、Li和F。 这项研究的结果将提供一个详细的了解B预算在高级变质作用，并提供重要的见解的过程中，结晶岩的形成。

9526403 Grew The proposed research is to study the mineralogy and petrology of certain carriers of boron in order to assess their role in the behavior of boron during high-grade metamorphism, migmatism and anatexis. The carriers to be studied include tourmaline, muscovite, sillimanite, kornerupine, grandidierite, and werdingite in metapelites in Western Maine. Special emphasis will be on assessing the role of aqueous fluid and anatectic melt in removing boron released by tourmaline breakdown. major element compositions will be determined by electron microprobe, Fe+2 and Fe+3 by Mossbauer spectroscopy, H in bulk samples by uranium extraction, H zoning by 15N reaction, bulk and microscopic B, Li and F microscopic measurements by ion microprobe. Results from this study will provide a detailed understanding of the B budget during high-grade metamorphism and provide important insights into the processes by which crystalline terranes are formed.