Springerville Volcanic Field, East-Central Arizona: A Case Study of Crust/Mantle Evolution and Petrogenetic Processes in a Tectonophysical Transition Zone

从不同的大地构造物理省的边界地区喷发的岩浆的化学和同位素特征提供了深入了解岩浆生成和演化，壳/幔演化，构造发展之间的关系。美国西南部，特别是科罗拉多高原-盆地和山脉地区，提供了研究这些关系的机会。对亚利桑那州中东部斯普林格维尔火山区的镁铁质熔岩进行的初步调查表明，该火山区是科罗拉多高原-盆地和山脉过渡带的一部分，其下有明显的地幔和地壳储层。两个地幔源已被确定，但这些源之间的相互作用的性质，或衍生熔体之间的说明，以及额外的地壳或地幔储层输入的特性，等待进一步详细的微量元素和多同位素调查。该项目将建立在最近发表和获得的现场，岩相，年代学和化学数据，通过更详细的化学和多同位素（Sr，Nd，Pb，O）的研究熔岩从整个Springerville成分谱。最终目标是确定过渡带的Springerville部分下方的次大陆地幔的特征，并确定该区域内作用的成岩过程的范围。这将导致更全面地了解岩石圈的构造状态对地幔储层发育和相互作用的性质的影响，以及引起大陆火山岩套中化学和同位素多样性的成岩过程。

The chemical and isotopic characteristics of erupted magmas from regions bounding distinct tetonophysical provinces provide insights into relationships between magma generation and evolution, crust/mantle evolution, and tectonic development. the southwestern United Stated, particularly the Colorado Plateau - Basin and Range region, yields opportunities to investigate these relationships. Preliminary investigations of mafic lavas from the Springerville volcanic field, east-central Arizona, suggest that this field marks a portion of the Colorado Plateau - Basin and Range transition zone and is underlain by distinct mantle and crustal reservoirs. Two mantle sources have been identified, but elucidation of the nature of interactions between these sources, or between derivative melts, and the characterization of additional crustal or mantle reservoir input awaits further detailed trace element and multi-isotope investigations. This project will build on recently published and acquired field, petrographic, chronologic, and chemical data through more detailed chemical and multi-isotope (Sr,Nd, Pb, O) studies of lavas from the entire Springerville compositional spectrum. The ultimate goal is to define the character of the subcontinental mantle beneath the Springerville portion of the transition zone and to define the range of petrogenetic processes acting within this region. This will lead to a more complete understanding of the effects that the tectonic state of the lithosphere have on the nature of mantle reservoir development and interaction, and the petrogenetic processes giving rise to chemical and isotopic diversity in continental volcanic suites.