Pb and U Elemental and Isotopic Fractionation in Radiation-Damaged Zircon: Implications for Low-Temperature Discordance Mechanisms
辐射损伤锆石中的 Pb 和 U 元素及同位素分馏:对低温不一致机制的影响
基本信息
- 批准号:0073602
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2000
- 资助国家:美国
- 起止时间:2000-07-01 至 2003-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
EAR-0073602MattinsonThis proposal requests support for investigation of a newly recognized behavior of Pb and U isotopes in the mineral zircon. The U-Pb system in zircon is widely used to determine the ages of geologic events, and fully understanding the system's behavior is required for accurate interpretation of measured ages. Loss of Pb from zircons produces "discordant" ages which can be accurately extrapolated to the "true" age only if the Pb loss mechanism is fully understood. Recent experiments reveal that loss of Pb related to low-temperature fluid leaching of naturally radiation-damaged zircon can be accompanied by isotopic fractionation of the Pb and also U isotopes. The isotopic fractionation of Pb is contrary to previously accepted ideas about Pb loss from zircons, and calls into question some important assumptions used in interpreting U-Pb age data. Understanding of this fractionation and Pb loss behavior is important in obtaining accurate ages from discordant zircon U-Pb data. The proposed research will combine zircon analysis by a series of partial dissolution steps, with annealing of the zircons at a range of temperatures prior to dissolution. The annealing partially to totally repairs the natural radiation damage, allowing detailed understanding of the exact role of the radiation damage in the loss of Pb from the system. Detailed study (electron microprobe and scanning electron microscope) of the chemical zoning within individual zircon grains, and of the possible pathways by which fluids gain access to the interiors of zircon grains, will help us better understand interactions of fluids with zircons on the intra-grain level, and the role of these fluids in U-Pb discordance.
EAR-0073602 Mattins这项提案要求支持对矿物锆石中新发现的铅和铀同位素行为的调查。锆石中的U-Pb系统被广泛用于确定地质事件的年龄,为了准确地解释测量的年龄,需要充分了解该系统的行为。锆石中铅的损失产生了“不一致”的年龄,只有在充分了解铅的损失机制的情况下,才能准确地推断出“真实”的年龄。最近的实验表明,与自然辐射损伤的锆石低温流体浸出有关的铅的损失可以伴随着铅和铀同位素的同位素分馏。铅的同位素分馏与以前公认的关于铅从锆石中损失的观点相反,并对用于解释U-Pb年龄数据的一些重要假设提出了质疑。了解这种分馏和铅的损失行为对于从不一致的锆石U-Pb数据中获得准确的年龄是很重要的。这项拟议的研究将结合通过一系列部分溶解步骤进行的锆石分析,以及在溶解前在一定温度范围内对锆石进行热处理。退火部分地修复了自然辐射损伤,使人们能够详细了解辐射损伤在系统中铅损失中的确切作用。对单个锆石颗粒内的化学分带以及流体进入锆石颗粒内部的可能途径进行详细研究(电子探针和扫描电子显微镜),将有助于我们更好地了解流体与锆石在颗粒内的相互作用,以及这些流体在U-Pb不一致性中的作用。
项目成果
期刊论文数量(0)
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科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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James Mattinson其他文献
James Mattinson的其他文献
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{{ truncateString('James Mattinson', 18)}}的其他基金
Development of the CA-TIMS method: Refining U-Pb Zircon Geochronology
CA-TIMS 方法的发展:精炼 U-Pb 锆石地质年代学
- 批准号:
0549674 - 财政年份:2007
- 资助金额:
-- - 项目类别:
Continuing Grant
Collaborative Research: Development of Improved Zircon Standards for SIMS and LA-ICP-MS-U-Pb Geochronology using CA-TIMS Pre-Treatment
合作研究:使用 CA-TIMS 预处理开发改进的 SIMS 和 LA-ICP-MS-U-Pb 地质年代学锆石标准品
- 批准号:
0549672 - 财政年份:2006
- 资助金额:
-- - 项目类别:
Standard Grant
A Geologic Redetermination of the Uranium Decay Constants, and Implications for Concordia Intercept Ages and High-Precision 207Pb/206Pb Ages
铀衰变常数的地质重新确定以及对 Concordia 截距年龄和高精度 207Pb/206Pb 年龄的影响
- 批准号:
9418560 - 财政年份:1995
- 资助金额:
-- - 项目类别:
Standard Grant
Upgrading of the UCSB Multi-Collector Thermal Ionization Mass Spectrometer
UCSB 多收集器热电离质谱仪的升级
- 批准号:
9316951 - 财政年份:1994
- 资助金额:
-- - 项目类别:
Standard Grant
Geologic, U-Pb Geochronologic and Nd Isotopic Studies of theCoast Mountains Batholith and Adjacent Terranes, SE Alaska and British Columbia
阿拉斯加东南部和不列颠哥伦比亚省海岸山脉基岩和邻近地体的地质、U-Pb 年代学和 Nd 同位素研究
- 批准号:
8917316 - 财政年份:1990
- 资助金额:
-- - 项目类别:
Standard Grant
U-Pb and Rb-Sr Isotopic Investigations of Terranes From South Island, New Zealand
新西兰南岛地体的 U-Pb 和 Rb-Sr 同位素研究
- 批准号:
8407505 - 财政年份:1984
- 资助金额:
-- - 项目类别:
Standard Grant
U-Pb Geochronology of the Hokonui Assemblage of New Zealand,A Permian-Jurassic Volcanic Arc Sequence From the Margin Of Gondwanaland
新西兰霍科努伊组合的U-Pb年代学,冈瓦纳大陆边缘的二叠纪-侏罗纪火山弧层序
- 批准号:
8218778 - 财政年份:1983
- 资助金额:
-- - 项目类别:
Standard Grant
U-Pb Isotopic Systematics and Geochronology of Blueschists Of California
加利福尼亚州蓝片岩的 U-Pb 同位素系统学和地质年代学
- 批准号:
8205823 - 财政年份:1982
- 资助金额:
-- - 项目类别:
Standard Grant
U-Pb Geochronology of Ophiolite-Island Arc Terranes in the California Coast Ranges, Baja California, and Northeastern Oregon-Western Idaho
加州海岸山脉、下加利福尼亚州和俄勒冈州东北部-爱达荷州西部蛇绿岩-岛弧地体的 U-Pb 年代学
- 批准号:
8008215 - 财政年份:1980
- 资助金额:
-- - 项目类别:
Standard Grant
U-Pb Ages of Zircons From Ophiolites and Related Rocks of The California Coast Ranges
加州海岸山脉蛇绿岩及相关岩石中锆石的 U-Pb 年龄
- 批准号:
7812958 - 财政年份:1978
- 资助金额:
-- - 项目类别:
Standard Grant
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The Elemental and Isotopic Partitioning Behavior of Nitrogen During Magmatic Differentiation
岩浆分异过程中氮的元素和同位素分配行为
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