RUI: Collaborative Research: Evaluation of Hybridization Mechanisms in Calc-Alkaline Granites

了解花岗岩的起源是至关重要的 重建地球历史的一部分 很可能有几个 过程（分步结晶，restite未混合， 岩浆混合是很重要的。 同位素和化学数据 表明镁铁质和长英质岩浆的混合是广泛的， 产生混合岩到更彻底的混合岩， 根据成分、温度和相对比例 相互作用的岩浆。 流变学模型预测， 混合岩脉应占主导地位， 支持这一预测。 然而，在较大的岩体中，混合- 很明显，在模拟 建议禁止混合。 这种二分法表明， 除了两种流体混合之外的机构也可以在 大型岩体 默里和里德将进行一个协调的领域，石油- 地质、地球化学和同位素研究 约塞米蒂国家公园，以测试两个额外的可行性 杂交机制，冷冻小球的解体， 玄武岩与围岩混染， 中间组合物。 网站包括一套部分 El Capitan和Tuolumne花岗岩中的分解枕 以及北美墙中一系列受污染的玄武岩 酋长 该项目将加强学校和社区的地质教育， 通过让学生参与研究的各个方面来进行教学：领域 参加研究研讨会， 专业会议。

Understanding the origin of granitic rocks is an essential part of reconstructing earth history. It is likely that several processes (fractional crystallization, restite unmixing, and magma mixing) are important. Isotopic and chemical data have suggested that mixing of mafic and felsic magmas is widespread, producing commingled rocks to more thoroughly hybridized rocks, depending on compositions, temperatures and relative proportions of the interacting magmas. Rheological modeling predicts that commingling should predominate, and small-scale composites dikes support this prediction. In larger plutons, however, hybridi- zation has apparently occurred under conditions that models suggest are prohibitive of mixing. This dichotomy suggests that mechanisms other than two fluid mixing may be operative in the large plutons. Murray and Reid will perform a coordinated field, petro- graphic, geochemical and isotopic study of localities in Yosemite National Park to test the viability of two additional hybridization mechanisms, disintegration of chilled globules and contamination of basalts with wallrock to more easily mixed intermediate compositions. Sites include a suite of partially disaggregated pillows in the El Capitan and Tuolumne granites and a series of contaminated basalts in the North America Wall, El Capitan. This project will enhance geologic education at both insti- tutions by involving students in all aspects of the study: field and analytical work, participation in research seminars and professional meetings.