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

本文拟对硼的某些载体进行矿物学和岩石学研究，以评价其在高变质作用、混合作用和深熔作用过程中对硼的影响。待研究的载体包括缅因西部变长岩中的电气石、白云母、硅线石、孔雀石、榴辉石和菱辉石。将特别强调评估含水流体和析氧熔体在去除电气石分解释放的硼方面的作用。主要元素组成用电子探针测定，Fe+2和Fe+3用穆斯堡尔谱法测定，体样中的H用铀萃取法测定，H用15N反应分带测定，体样和显微B、Li和F用离子探针测定。本研究结果将提供对高变质期B收支的详细了解，并为结晶地体的形成过程提供重要的见解。

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.