SHRIMP uranium-lead dating of diagenetic xenotime in siliciclastic sedimentary rocks

被引：100
作者：
McNaughton, NJ [1 ]
Rasmussen, B [1 ]
Fletcher, IR [1 ]
机构：
[1] Univ Western Australia, Dept Geol & Geophys, Ctr Strateg Mineral Deposits, Nedlands, WA 6907, Australia
来源：
SCIENCE | 1999年 / 285卷 / 5424期
关键词：
D O I：
10.1126/science.285.5424.78
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Diagenetic xenotime is common in silicic lactic sedimentary rocks, where it starts to form on detrital zircon shortly after sediment deposition. It is possible to estimate the age of sedimentary rocks by in situ uranium-lead analysis of that xenotime. Two Proterozoic sandstone units from northwestern Australia, previously constrained to the age interval of 1790 to 750 million years ago, have diagenetic xenotime ages of 1704 +/- 7 and 1704 +/- 14 million years ago. This method has potential for dating sedimentary sequences of all ages but should be especially valuable for refining the Precambrian time scale.
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页码：78 / 80
页数：5
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