【引用本文】 张勇, 魏华, 陆太进, 等. 新疆奥米夏和田玉矿床成因及锆石LA-ICP-MS定年研究[J]. 岩矿测试, 2018, 37(6): 695-704. doi: 10.15898/j.cnki.11-2131/td.201801170007
ZHANG Yong , WEI Hua , LU Tai-jin , et al. The Genesis and LA-ICP-MS Zircon Ages of the Omixia Nephrite Deposit, Xinjiang, China[J]. Rock and Mineral Analysis, 2018, 37(6): 695-704. doi: 10.15898/j.cnki.11-2131/td.201801170007

新疆奥米夏和田玉矿床成因及锆石LA-ICP-MS定年研究

1. 自然资源部珠宝玉石首饰管理中心, 北京 100013;

2. 国家珠宝玉石质量监督检验中心, 北京 100013;

3. 新疆维吾尔自治区和田地区质监局, 新疆 和田 848000

收稿日期: 2018-01-17  修回日期: 2018-05-07 

基金项目: 国家自然科学基金项目(41802073);国家珠宝玉石质量监督检验中心科研基金项目(NGTCBJ17009-2)

作者简介: 张勇,硕士,助理研究员,宝石学专业,主要从事宝玉石科研工作。E-mail:zyongbj@126.com。。

The Genesis and LA-ICP-MS Zircon Ages of the Omixia Nephrite Deposit, Xinjiang, China

1. National Gems & Jewelry Technology Administrative Center, Ministry of Natural Resources, Beijing 100013, China;

2. National Gemstone Testing Center, Beijing 100013, China;

3. Hetian Bureau of Quality and Technical Supervision, Hetian 848000, China

Received Date: 2018-01-17
Revised Date: 2018-05-07

摘要:新疆奥米夏和田玉矿床分布在西昆仑造山带中段,产于花岗岩与镁质大理岩之间,该玉矿规模大,开采历史悠久,然而其矿床成因和成矿年代缺乏研究。本文采用岩相学、全岩分析手段对该玉矿的成因进行了研究,利用玉石中的锆石LA-ICP-MS定年方法限定了玉矿的成矿时代。岩相学观察结果表明玉石多期次形成的现象较为明显;全岩稀土配分模式表明玉石稀土元素总量丰度低(∑REEs平均值7.228 μg/g),Eu负异常(δEu=0.58~0.73),LREEs下降,HREEs平坦;和田玉中锆石206Pb/238U年龄显示该玉矿的成矿上限年龄介于411.1±5.3 Ma~489.6±10.5 Ma之间。综合分析认为,该玉矿为接触交代成因的镁质矽卡岩型和田玉矿床,玉石形成过程中经历了透闪石化、细粒化、重结晶等复杂的成矿过程,其形成时代与西昆仑地区其他玉矿一致,整体上可能形成于加里东晚期至海西早期。本研究有助于认识新疆西昆仑地区和田玉的形成机理,也可为西昆仑地区的地质研究提供新的基础数据。

关键词: 镁质矽卡岩, 和田玉, 接触交代, 锆石定年

The Genesis and LA-ICP-MS Zircon Ages of the Omixia Nephrite Deposit, Xinjiang, China

KEY WORDS: Mg-skarn, nephrite, contact metasomatic metamorphism, zircon dating

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新疆奥米夏和田玉矿床成因及锆石LA-ICP-MS定年研究

张勇, 魏华, 陆太进, 陈华, 韩冬, 冯晓燕, 买托乎提·阿不都瓦衣提