Support for the Penrose Conference on Arc Crustal Genesis and Evolution; July 9-15, 2006; Valdez, Alaska

该奖项为将于2006年7月9日至15日在阿拉斯加中南部瓦尔迪兹举行的关于弧形地壳成因和演化的彭罗斯会议提供部分支持。专题介绍将把阿拉斯加中南部侏罗纪Talkeetna弧以及巴基斯坦和印度北部白垩纪拉达克-科希斯坦弧暴露良好的弧形地壳剖面的最新成果与活动弧型地球化学、岩石学和地球物理学方面的重要新发展结合起来。塔尔基特纳和拉达克-科希斯坦弧线提供了从莫霍面深度(两种情况下都是30到40公里)到火山岩和火山碎屑沉积的相对完整的剖面。在过去的十年里，这两个都是大型多学科大陆动力学计划(CD)项目的主题，并提供了在活跃的洋弧中无法获得的深度剖面和时间进程。最近对其他地方的弧状深成岩套进行了密集的调查，补充了这些项目。来自美国边缘倡议、内华达山脉大陆动力学项目、阿留申研究和类似国际倡议的新数据限制了活跃弧区的地壳厚度和火山通量。熔体包裹体研究的进展极大地提高了对原始弧状岩浆中挥发分的认识。对超高压变质岩的研究和新的实验方法为地幔楔形熔体的形成、俯冲带的脱水和深熔作用提供了新的见解。这次会议将提供一个综合这些结果的机会，重点是利用对从最上层地幔到火山岩的弧形地壳剖面的直接观测，以限制弧形过程及其在大陆地壳起源和演化中的作用。主旨发言人的反应热烈，24人中只有1人拒绝了承诺书的要求，这表明召开这次会议的时机恰到好处，它将吸引一批消息灵通的优秀与会者，他们有很多要讨论的问题。为补充研究报告，会议将包括至少两次实地考察，前往塔尔基特纳弧的火山露头和莫霍面地段。

0632774HackerThis award provides partial support for a Penrose Conference on arc crustal genesis and evolution which will be held in Valdez, in south-central Alaska, from July 9-15, 2006. Presentations will integrate recent results on well-exposed arc crustal sections in the Jurassic Talkeetna arc in south central Alaska, and in the Cretaceous Ladakh-Kohistan arc in northern Pakistan and India with important new developments in active-arc geochemistry, petrology and geophysics. The Talkeetna and Ladakh-Kohistan arcs provide exposures of relatively complete sections from Moho depth (30 to 40 km in both cases), to volcanic rocks and volcaniclastic sediments. Both have been the subject of large, multi-disciplinary Continental Dynamics Program (CD) projects over the past decade, and provide depth sections and temporal progressions that are not accessible in active oceanic arcs. Intensive, recent investigations of arc plutonic suites elsewhere complement these projects. New data from the US MARGINS Initiative, Sierra Nevada Continental Dynamics Projects, Aleutian studies, and similar international initiatives provide constraints on crustal thickness and volcanic fluxes in active arcs. Advances in the study of melt inclusions have dramatically improved understanding of volatiles in primitive arc magmas. Studies of ultra-high pressure metamorphic rocks and new experimental methods have yielded insights into mantle wedge melt generation, and subduction zone dehydration and anatexis. This conference will provide an opportunity to synthesize these results, with a focus on using direct observations of arc crustal sections, from the uppermost mantle to the volcanics, to constrain arc processes and their role in the genesis and evolution of continental crust. The enthusiastic response of keynote speakers, only one out of twenty-four declined the request for letters of commitment, indicates that the time is right for this conference, and that it will attract an excellent group of well informed participants with much to discuss. To complement research presentations, the Conference will include at least two field trips, to accessible outcrops of volcanic and the Moho sections of the Talkeetna arc.