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Magma Supply Dynamics at Slow Spreading Rates: South Atlantic at 26 Degrees South

缓慢扩散速度下的岩浆供应动态：南纬 26 度的南大西洋

基本信息

批准号：
8903296
负责人：
Rodey Batiza
金额：
$ 9万
依托单位：
University of Hawaii
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：
1989-01-15 至 1990-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8903296&HistoricalAwards=false
关键词：
Magma Supply Dynamics Slow Spreading

项目摘要

This is a project to test whether central or multiple supply is dominant (e.g., as a function of spreading rate, or regionally at the same spreading rate), by carrying out a laboratory petrologic and geochemical study of closely-spaced (7 km) samples from a well-mapped 100 km-long segment of the slow spreading (35-40 mm/yr) Mid-Atlantic Ridge (MAR) at 26 degrees S. The 26 degrees S segment is ideal for such a test because of its simple along-axis morphology (typical of many MAR segments), the absence of hot spot influence, the existence of dense Seabeam, gravity, and magnetic data, and the availability of closely-spaced axial basalt samples an samples from nearby seamounts, Preliminary chemical data for the samples show remarkably regular and systematic patterns of along-axis chemical variations, indication that continued, more detailed petrologic and chemical studies are justified. %%% Process that supply basalt melt to active mid-ocean ridges are of current interest because melt supply dynamics play a key role in the formation of oceanic crust. Dr. Batiza possesses an important set of closely spaced samples at a slow spreading ridge axis. The results will improve our understanding of magma supply dynamics at a slow spreading ridge, and the data will be useful for comparison with similar data sets for fast- spreading ridges.

这是一个测试集中或多重供应是否占主导地位的项目（例如，作为传播率的函数，或以相同的传播率在区域内）。通过对位于南纬26度缓慢扩张（35-40毫米/年）的大西洋中脊（MAR） 100公里长段的精确绘制的紧密间隔（7公里）样品进行实验室岩石学和地球化学研究。南纬26度段是进行此类测试的理想选择，因为其简单的沿轴形态（许多MAR段的典型特征），没有热点影响，密集的海床、重力和磁场数据的存在，以及密集的轴向玄武岩样品和附近海山样品的可用性。样品的初步化学数据显示出沿轴化学变化的非常规则和系统的模式，表明持续，更详细的岩石学和化学研究是合理的。向活跃的洋中脊供应玄武岩熔体的过程是目前的研究热点，因为熔体供应动力学在海洋地壳的形成中起着关键作用。Batiza博士在缓慢扩散的脊轴上拥有一组重要的紧密间隔样本。研究结果将提高我们对慢扩张脊的岩浆供应动力学的认识，并可用于与快速扩张脊的类似数据集进行比较。