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首页> 外文期刊>Contributions to Mineralogy and Petrology >Dating magmatic and hydrothermal processes using andradite-rich garnet U-Pb geochronometry
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Dating magmatic and hydrothermal processes using andradite-rich garnet U-Pb geochronometry

机译：使用Andradite-Richnet U-PB地球体的岩浆和水热源流程

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摘要

Andradite-rich garnet is a common U-bearing mineral in a variety of alkalic igneous rocks and skarn deposits, but has been largely neglected as a U-Pb chronometer. In situ laser ablation-inductively coupled plasma mass spectrometry U-Pb dates of andradite-rich garnet from a syenite pluton and two iron skarn deposits in the North China craton demonstrate the suitability and reliability of the mineral in accurately dating magmatic and hydrothermal processes. Two hydrothermal garnets from the iron skarn deposits have homogenous cores and zoned rims (Ad(86)Gr(11) to - Ad(98)Gr(1)) with 22-118 ppm U, whereas one magmatic garnet from the syenite is texturally and compositionally homogenous - (Ad(70)Gr(22) to - Ad(77)Gr(14)) and has 0.1-20 ppm U. All three garnets have flat time-resolved signals obtained from depth profile analyses for U, indicating structurally bound U. Uranium is correlated with REE in both magmatic and hydrothermal garnets, indicating that the incorporation of U into the garnet is largely controlled by substitution mechanisms. Two hydrothermal garnets yielded U-Pb dates of 129 +/- 2 (2 sigma; MSWD = 0.7) and 130 +/- 1 Ma (2 sigma; MSWD = 0.5), indistinguishable from zircon U-Pb dates of 131 +/- 1 and 129 +/- 1 Ma for their respective ore-related intrusions. The magmatic garnet has a U-Pb age of 389 +/- 3 Ma (2 sigma; MSWD = 0.6), consistent with a U-Pb zircon date of 388 +/- 2 Ma for the syenite. The consistency between the garnet and zircon U-Pb dates confirms the reliability and accuracy of garnet U-Pb dating. Given the occurrence of andradite-rich garnet in alkaline and ultramafic magmatic rocks and hydrothermal ore deposits, our results highlight the potential utilization of garnet as a powerful U-Pb geochronometer for dating magmatism and skarn-related mineralization.
机译：Richite的石榴石是各种碱性火岩和矽卡岩矿床的常见U轴承矿物，但已忽略忽视为U-PB时计。原位激光消融 - 电感耦合等离子体质谱血浆质谱来自Syenite芦苇的Andradite的石榴石的U-PB日期和华北CRATON中的两枚铁矽卡岩矿床展示了矿物准确约会岩浆和水热过程中矿物的适用性和可靠性。来自铁鞋垫的两个水热石榴石具有均匀的核心和分区轮辋（AD（86）GR（11）到 - AD（98）GR（1）），其中22-118 ppm U，而来自Syenite的一只岩浆石榴石是教学的和合成的均匀 - （AD（70）GR（22）至 - AD（77）GR（14））并具有0.1-20ppm U.所有三个装饰品具有从深度分析的平面时间分辨信号，指示在结构上结合的U.铀与岩浆和水热石榴石中的雷孔相关，表明将U掺入石榴石中大部分通过替换机制控制。两个水热石榴石产生U-Pb日期为129 +/- 2（2 sigma; Mswd = 0.7）和130 +/- 1 mA（2 sigma; Mswd = 0.5），与131 +/-的锆石U-Pb日期无法区分。与其各自的矿石相关的入侵1和129 +/- 1 mA。 Magmatic Garnet的U-PB年龄为389 +/- 3 mA（2 sigma; Mswd = 0.6），与Syenite的U-PB锆石Zircon日期一致。 Garnet和锆石U-PB日期之间的一致性证实了Garnet U-Pb约会的可靠性和准确性。鉴于碱性和超微岩石岩石和热热矿石沉积物中富含富铬的石榴石的发生，我们的结果突出了石榴石的潜在利用作为约会岩浆学和与矽卡岩相关矿化的强大U-PB地球节计。

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