粤北长江铀矿田花岗岩独居石U-Pb同位素定年及其地质意义

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陈妍, 潘家永, 钟福军, 万建军, 严杰, 刘文泉, 李海东. 粤北长江铀矿田花岗岩独居石U-Pb同位素定年及其地质意义[J]. 岩矿测试, 2022, 41(1): 1-13. doi: 10.15898/j.cnki.11-2131/td.202103120038

引用本文: 陈妍, 潘家永, 钟福军, 万建军, 严杰, 刘文泉, 李海东. 粤北长江铀矿田花岗岩独居石U-Pb同位素定年及其地质意义[J]. 岩矿测试, 2022, 41(1): 1-13. doi: 10.15898/j.cnki.11-2131/td.202103120038

CHEN Yan, PAN Jia-yong, ZHONG Fu-jun, WAN Jian-jun, YAN Jie, LIU Wen-quan, LI Hai-dong. U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance[J]. Rock and Mineral Analysis, 2022, 41(1): 1-13. doi: 10.15898/j.cnki.11-2131/td.202103120038

Citation: CHEN Yan, PAN Jia-yong, ZHONG Fu-jun, WAN Jian-jun, YAN Jie, LIU Wen-quan, LI Hai-dong. U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance[J]. Rock and Mineral Analysis , 2022, 41(1): 1-13. doi: 10.15898/j.cnki.11-2131/td.202103120038

长江铀矿田位于诸广山复式岩体中南部，是典型的花岗岩型铀矿田。前人采用锆石U-Pb定年方法对赋矿花岗岩进行了年代学研究，但由于全岩和锆石铀含量较高，锆石往往发生了蜕晶化，可能导致锆石U-Pb定年数据散乱，影响锆石U-Pb年龄的可靠性。独居石是花岗岩中广泛存在的含铀副矿物，铀和钍含量均较高，可达10000×10 ^-6 ，普通铅含量低，约100×10 ^-6 ~1000×10 ^-6 ，是开展U-Pb定年的理想矿物。本文对长江铀矿田赋矿花岗岩中的独居石开展了激光剥蚀电感耦合等离子体质谱（LA-ICP-MS）U-Pb定年，分别选用独居石标准物质USGS44069和Trebilcock作为外部标样和监控标样，结果显示油洞岩体的独居石U-Pb年龄为228.0±1.5Ma（MSWD=0.82， n =23），长江岩体的独居石U-Pb年龄为156.8±1.7Ma（MSWD=0.76， n =14），与SHRIMP锆石年龄在误差范围内一致（分别为232±4Ma和160±2Ma），进一步证实了油洞岩体为印支晚期岩浆活动的产物，长江岩体为燕山早期岩浆活动的产物。因此，本研究认为高铀花岗岩中独居石U-Pb年龄可以有效地约束其成岩时代。

独居石U-Pb定年激光剥蚀电感耦合等离子体质谱法长江铀矿田 Abstract: BACKGROUND

The Changjiang uranium ore field in the southern margin of the Zhuguangshan complex pluton is a typical granite-type uranium ore field in China. Zircon U-Pb dating has been used to date ore-bearing granites. However, due to the high content of uranium in the whole rock and zircon mineral, some zircons tend to be decrystallized, which may lead to scattered zircon U-Pb data and may affect the reliability of zircon U-Pb dating. Monazite is a widespread accessory mineral in granite, and it is an ideal mineral for U-Pb dating due to its high U and Th contents (up to 10000×10 ^-6 ), and low common Pb content of about 100×10 ^-6 -1000×10 ^-6 .

RESULTS

The ²⁰⁶ Pb/ ²³⁸ U age of monazite in the Youdong pluton is 228.0±1.5Ma (MSWD=0.82, n =23), and that of monazite in the Changjiang pluton is 156.8±1.7Ma (MSWD=0.76, n =14). These ages are consistent with the SHRIMP zircon ages of 232±4Ma and 160±2Ma, respectively, which further confirms that the Youdong pluton is the product of Late Indosinian magmatism, and the Yangtze River pluton is the product of early Yanshanian magmatism.

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BSE images of monazite from fine grained biotite granite in the Changjiang pluton

Figure 5.

Concordant age and weighted average age of granite monazite in Youdong and Changjiang plutons

Figure 6.

Ages of Youdong and Changjiang plutons under different test minerals