Geochemistry and U-Pb Dating of Heavy Mineral Zircons and Their Significance in Lamproites and Associated Rocks from Ningxiang, Hunan Province[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2011,50(3):105-111.
Geochemistry and U-Pb Dating of Heavy Mineral Zircons and Their Significance in Lamproites and Associated Rocks from Ningxiang, Hunan Province[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2011,50(3):105-111.DOI:
Heavy mineral zircons were separated from diamondiferous lamproites and their associated rocks in Ningxiang and nearby area
Hunan province
and their main and trace element compositions
interior structure and the U-Pb isotopic ages were obtained with EPMA
cathodoluminescence microscope and LA-ICPMS measurement. The zircons in lamproites from different locations generally have similar geochemical characteristics. The U-Pb dating of zircons suggests that the lamproites were probably formed during multistages. A young age of (101.6±5.1)Ma was obtained on four zircon samples from No.1 and No.3 pipe lamproites The zircon collected from the Cretaceous red strata in Shangwutong area has a concordant
207
Pb/
206
Pb age of (2 008±29)Ma. These results cannot specifically determine the source rocks of diamond in the study area.