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| 辽宁后仙峪硼矿床氩-氩定年及其地质意义 | |
| 引用本文： | 汤好书,陈衍景,武广.辽宁后仙峪硼矿床氩-氩定年及其地质意义[J].岩石学报,2009,25(11):2752-2762. |
| 作者姓名： | 汤好书 陈衍景 武广 |
| 作者单位： | 1. 北京大学造山带与地壳演化教育部重点实验室,北京,100871 2. 北京大学造山带与地壳演化教育部重点实验室,北京,100871;中科院广州地球化学研究所成矿动力学重点实验室,广州,510640 3. 中科院广州地球化学研究所成矿动力学重点实验室,广州,510640 |
| 基金项目： | 国家973项目，自然科学基金项目 |
| 摘 要： | 辽吉硼矿带是世界级非金属成矿省,但其成矿时代研究薄弱,成因类型和构造环境认识分歧.本文报道新获得的后仙峪超大型硼镁矿床金云母~(40)Ar-~(39)Ar年龄,并厘定成矿时代.主矿体金云母氩-氩坪年龄为884.4±8.9Ma(MSWD=0.47),正、反等时线年龄分别为885.0±7.5 Ma(MSWD=0.55)和885.8±7.3 Ma(MSWD=0.79),表明主成矿事件发生在885Ma左右,可能与Rodinia超大陆汇聚事件有关.矿体与闪长岩脉接触带蚀变岩的金云母氩-氩坪年龄为386.5±3.9Ma(MSWD=1.4),正、反等时线年龄分别为386.7±5.3 Ma(MSWD=2.6)和387.1±7.2 Ma(MSWD=3.9),代表成矿后局部改造事件的年龄,后期改造与早泥盆世岩浆作用有关. |
| 关 键 词： | 氩-氩年龄 后仙峪硼矿床 辽吉硼矿带 辽河群 华北克拉通 |
| 收稿时间： | 2009/9/12 0:00:00 |
| 修稿时间： | 2009/10/15 0:00:00 |
40Ar-39Ar dating and its geological implication of the Houxianyu boron deposit, Liangning province |
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| TANG HaoShu,CHEN YanJing and WU Guang.40Ar-39Ar dating and its geological implication of the Houxianyu boron deposit, Liangning province[J].Acta Petrologica Sinica,2009,25(11):2752-2762. | |
| Authors: | TANG HaoShu CHEN YanJing and WU Guang |
| Abstract: | The Liao-Ji giant boron belt is a world-class non-metallic ore province, but its metallogenic time has not been well constrained yet. The metallogenic type and tectonic setting of the Liao-Ji boron belt are still controversial. In this paper we present new 40Ar-39Ar phlogopite ages for the Houxianyu Boron deposit to time the boron mineralization. Phlogopite grains separated from the major ore-body yield 40Ar/39Ar plateau age of 884.4±8.9Ma (MSWD=0.47), isochron age of 885.0±7.5Ma (MSWD=0.55) and anti-isochron age of 885.8±7.3Ma (MSWD=0.79), respectively. This shows that the boron mineralization mainly occurred at ca 885 Ma and might be genetically related to the assembly of the Rodinia supercontinent. Whilst the phlogopite grains separated from contact-zone metasomatite between ore-body and diorite dyke yield 40Ar/39Ar plateau age of 386.5±3.9 Ma (MSWD=1.4), isochron age of 386.7±5.3 Ma (MSWD=2.6) and anti-isochron age of 387.1±7.2 Ma (MSWD=3.9), respectively, reflecting a post-ore overprint event which was possibly related to the Early Devonian magmatism. |
| Keywords: | ~(40)Ar-~(39)Ar age Houxianyu boron deposit Liao-Ji boron belt Liaohe Group North China Craton |
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