Fundamentals of Surface Exposure Dating: Latitude, Matrix and Geometric Effects
Fundamentals of Surface Exposure Dating: Latitude, Matrix and Geometric Effects
批准号:
9206037
负责人:
David Elmore
金额:
$12.93万
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
1992
资助国家:
美国
项目状态:
已结题
起止时间:
1992-07-01 至 1994-12-31
中文摘要
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英文摘要
Cosmogenic nuclides provide an important tool for determining the time a rock has been exposed to cosmic rays on the Earth's surface and also for determining erosion rates of geomorphic surfaces. Several important applications have already been demonstrated: dating past glacial episodes from exposure ages of rocks on moraines, dating volcanic eruptions, and dating meteor crater impacts. Although these studies have been successful in producing semi-quantitative results, reliable interpretation requires a better understanding of the fundamentals of production mechanisms of cosmogenic nuclides. The three aspects of surface exposure dating that have been studied least are the dependence of the cosmic ray flux on latitude, the dependence of the production rates on the rock matrix, and the dependence of production rates on the geometry of the rock. The limited data available on the cosmic ray flux does not include important effects of the air/ground boundary. This proposal requests funding to measure 10Be, 26Al, and 36Cl depth profiles in several rocks of same age and in the same location but of different lithology using accelerator mass spectrometry. The latitude correction will be investigated using granitic rocks of same age, but from different latitudes. All rocks will be dated independently and will show glacial polish to rule out erosion. A production rate model will be developed using Monte Carlo particle transport codes and measurements will be compared with theoretical values. The production rate model developed will then be available for others to predict surface production rates in other rocks of different lithology, other geometries, and other latitudes.
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Facility Support: The Purdue Rare Isotope Measurement Laboratory
-
批准号:0112480
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项目类别:Continuing Grant
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资助金额:$75.0万
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财政年份:2001
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负责人:David Elmore
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依托单位:
Development of an Ion Source for Accelerator Mass Spectrometry
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批准号:0092508
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项目类别:Standard Grant
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资助金额:$17.1万
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财政年份:2001
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负责人:David Elmore
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依托单位:
Facility Support: The Purdue Rare Isotope Measurement Laboratory
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批准号:9809983
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项目类别:Continuing Grant
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资助金额:$166.18万
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财政年份:1998
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负责人:David Elmore
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依托单位:
Development of Accelerator Mass Spectrometry InstrumentationAt Prime Lab
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批准号:9512381
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项目类别:Standard Grant
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资助金额:$120.0万
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财政年份:1995
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负责人:David Elmore
-
依托单位:
Facility Support: The Purdue Rare Isotope Measurement Laboratory
-
批准号:9510040
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项目类别:Continuing Grant
-
资助金额:$97.5万
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财政年份:1995
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负责人:David Elmore
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依托单位:
Facility Support: The Purdue Rare Isotope Measurement Laboratory
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批准号:9305859
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项目类别:Continuing Grant
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资助金额:$50.0万
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财政年份:1993
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负责人:David Elmore
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依托单位:
Development of the Accelerator Mass Spectrometry Instrument at Purdue University
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批准号:9214636
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项目类别:Standard Grant
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资助金额:$149.9万
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财政年份:1992
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负责人:David Elmore
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依托单位:
Upgrading the AMS Facility at Prime Lab
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批准号:9206314
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项目类别:Standard Grant
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资助金额:$6.34万
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财政年份:1992
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负责人:David Elmore
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依托单位:
Research in the Earth Sciences Using Accelerator Mass Spectrometry at Purdue University
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批准号:8916667
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项目类别:Continuing Grant
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资助金额:$66.65万
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财政年份:1990
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负责人:David Elmore
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依托单位:
An Automated High Intensity Ion Source for the AMS Facility at Purdue University
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批准号:9018886
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项目类别:Standard Grant
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资助金额:$6.79万
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财政年份:1990
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负责人:David Elmore
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依托单位:
An Ion Source for Accelerator Mass Spectrometry of 36Cl, 41Ca and 129I
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批准号:8609501
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项目类别:Standard Grant
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资助金额:$6.22万
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财政年份:1986
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负责人:David Elmore
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依托单位:
An Interagency Briefing on the Future of Accelerator Mass Spectrometry in the USA
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批准号:8512169
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项目类别:Standard Grant
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资助金额:$1.1万
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财政年份:1985
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负责人:David Elmore
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依托单位:
Study of Antarctic Ice Using Radionuclides Produced By Cosmic Rays
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批准号:8410467
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项目类别:Continuing Grant
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资助金额:$5.49万
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财政年份:1985
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负责人:David Elmore
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依托单位:
Investigation of 36C1 and 10Be in Polar Ice Cores
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批准号:8212793
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项目类别:Continuing Grant
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资助金额:$11.4万
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财政年份:1983
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负责人:David Elmore
-
依托单位:
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