Beryllium in Granulite-Facies Pegmatites in Archean Napier Complex, Antarctica

该奖项由国家科学基金会极地项目办公室提供，支持缅因州大学的一名研究人员参加日本南极研究考察队（JARE）的一次考察，研究恩德比地的铍富集矿物。 铍是地壳岩石中的一种稀有元素，在麻粒岩相（高温高压，相对干燥的条件）变质岩中富集尤为罕见。本项目的重点是东南极洲恩德比地凯西湾东部太古代超高温（高达1000摄氏度）麻粒岩相纳皮耶杂岩中独特的富铍伟晶岩。主要目的是检验铍起源于伟晶岩的变质沉积物而不是伟晶岩浆成分的假设。 1998/1999年南极考察季节将在恩德比地进行实地考察，作为日本南极研究考察队题为“东南极岩石圈的结构和演变”项目的一部分。 矿物和岩石成分将用于确定伟晶岩及其寄主岩石的演化和结晶条件。该项目的研究结果将对麻粒岩相高温低水环境下铍的地球化学行为提供重要的认识。

This award, provided by the Office of Polar Programs of the National Science Foundation, supports participation of a researcher from the University of Maine in an expedition of the Japanese Antarctic Research Expedition (JARE) to study beryllium enriched minerals in Enderby Land. Beryllium is a rare element in crustal rocks and enrichments are especially unusual in granulite-facies (high temperature and pressure, and relatively dry conditions) metamorphic rocks. This project focuses on unique beryllium-enriched pegmatites in the Archean ultra-high temperature (up to 1000 degrees C) granulite-facies Napier Complex in eastern Casey Bay, Enderby Land, East Antarctica. The primary objective is to test the hypothesis that the beryllium originated in the metasediments hosting the pegmatites rather than being a component of a pegmatitic magma. Field work will be conducted during the 1998/99 austral field season in Enderby Land as a part of the Japanese Antarctic Research Expedition's project entitled "Structure and Evolution of East Antarctic Lithosphere". Mineral and rock compositions will be used to determine the evolution and conditions of crystallization of the pegmatites and their host rocks. The results of the project will provide some important insights on the geochemical behavior of beryllium under the high temperatures and low water activities characteristic of the granulite facies.