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

亚利桑那州中东部斯普林格维尔火山田：构造物理过渡带中地壳/地幔演化和岩石成因过程的案例研究

基本信息

批准号：
8904596
负责人：
William Hart
金额：
--
依托单位：
Miami University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1989
资助国家：
美国
起止时间：
1989-06-01 至 1991-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8904596&HistoricalAwards=false
关键词：
Springerville Volcanic Field East Central

项目摘要

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.

来自不同构造物理区边界区域的喷发岩浆的化学和同位素特征为了解岩浆生成和演化、地壳/地幔演化和构造发展之间的关系提供了见解。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田的镁铁质熔岩的初步调查表明，该火山田标志着科罗拉多高原 - 盆地和山脉过渡区的一部分，其下方是独特的地幔和地壳储层。已经确定了两个地幔源，但阐明这些源之间或衍生熔体之间相互作用的性质，以及额外地壳或地幔储层输入的表征还有待进一步详细的痕量元素和多同位素研究。该项目将建立在最近发布和获得的现场、岩相学、年代学和化学数据的基础上，通过对整个斯普林格维尔成分谱中的熔岩进行更详细的化学和多同位素（Sr、Nd、Pb、O）研究。最终目标是确定过渡带斯普林格维尔部分下方次大陆地幔的特征，并确定该区域内作用的岩石成因过程的范围。这将导致人们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，以及导致大陆火山岩套化学和同位素多样性的岩石成因过程。