川西塔公松林口岩体LA-ICP-MS锆石U-Pb年龄与地球化学特征
| 1. | 中国地质科学院矿产综合利用研究所, 四川 成都 610041 |
| 2. | 中国地质调查局稀土资源应用技术创新中心, 四川 成都 610041 |
| 3. | 中国地质调查局金属矿产资源综合利用技术研究中心, 四川 成都 610041 |
Zircon LA-ICP-MS U-Pb Age and Geochemical Features of the Songlinkou Pluton, Western Sichuan
| 1. | Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu 610041, China |
| 2. | Technology Innovation Center of Rare Earth Resources Development and Utilization, China Geological Survey, Chengdu 610041, China |
| 3. | Research Center of Multipurpose Utilization of Metal Mineral Resources, China Geological Survey, Chengdu 610041, China |
摘要：松林口岩体出露于松潘—甘孜造山带东缘，紧邻甲基卡超大型稀有金属伟晶岩型锂矿床，为确定松林口岩体侵位时代与物质来源，探讨该岩体与甲基卡成矿岩体的地球化学和含矿性差异，本文对采集的11件岩体样品，采用X射线荧光光谱法、电感耦合等离子体质谱法（ICP-MS）、激光剥蚀电感耦合等离子体质谱法（LA-ICP-MS）和多接收电感耦合等离子体质谱法（MC-ICP-MS），对岩石的主量和微量元素组成、锆石U-Pb年龄和锆石Lu-Hf同位素进行分析。结果表明：松林口岩体中富含闪长质暗色包体，SiO2含量介于56.56%~68.99%之间，全碱含量3.78%~6.82%，K2O/Na2O=1.02~1.93，里特曼指数σ=1.01~1.93，Mg#值总体为46.73~61.27，岩石属于高钾钙碱性Ⅰ型花岗岩系列，具有轻稀土富集的特点，LREE/HREE=2.67~8.31，LaN/YbN值为2.11~9.74，所有岩石样品均具有明显的负Eu异常；总体上松林口岩体及其包体富集LILE元素，Ta、Nb、P、Ti等HFSE元素相对亏损。松林口边部花岗闪长岩、中部二长花岗岩的锆石U-Pb年龄分别为212.6±1.0Ma（MSWD=0.55）、222.4±1.1Ma（MSWD=0.39），岩浆侵位时代为晚三叠世；二长花岗岩锆石Lu-Hf同位素结果εHf（t）介于-9.09~-6.86，二阶段模式年龄（TDMC）在1524.874~1666.002Ma之间，岩体物质来源是中元古代扬子克拉通基底物质部分熔融，并混有部分富集上地幔物质。甲基卡S型花岗岩为上地壳部分熔融形成的，与松林口岩体属不同的物质来源，且岩浆演化程度和成矿构造条件不同，这可能是松林口岩体不具有锂稀有金属成矿的主要原因。
Zircon LA-ICP-MS U-Pb Age and Geochemical Features of the Songlinkou Pluton, Western Sichuan
ABSTRACT
BACKGROUND:
The Songlinkou pluton is located in the eastern margin of the Songpan-Ganzi orogenic belt, which is adjacent to the pegmatite-type lithium deposit of Jiajika.
OBJECTIVES:
To explore the similarities and differences between Songlinkou pluton and Jiajika mineralized intrusive rocks, and to study geological conditions of mineralization and magma sources of the pluton.
METHODS:
Major and trace elements were determined by X-ray fluorescence spectrometry (XRF) and inductively coupled plasma-mass spectrometry (ICP-MS), respectively. Zircon U-Pb age and Hf isotopes were analyzed by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and multiple collector-inductively coupled plasma-mass spectrometry (MC-ICP-MS), respectively.
RESULTS:
The Songlinkou pluton contained diorite enclaves, and has SiO2 contents of 56.56%-68.99%, total alkali of 3.78%-6.82%, K2O/Na2O of 1.02-1.93, and Rittmann indices of 1.01-1.93. The rock has relative high Mg# values (Mg#=46.73-61.27). The rock belongs to the high-potassium calcium-alkaline type I granite series showed light rare earth enrichment with LREE/HREE ratios of 2.67-8.31, LaN/YbN of 2.11-9.74. All samples have strongly negative Eu anomaly. It was rich in LILE, and depleted in Ta, Nb, P and Ti. The zircon U-Pb results of the granodiorite and monzogranite were 212.6±1.0Ma (MSWD=0.55) and 222.4±1.1Ma (MSWD=0.39), respectively. The εHf(t) of zircon in monzogranite ranged from -9.09 to -6.86, and TDMC ranged from 1524.874Ma to 1666.002Ma.
CONCLUSIONS:
The Songliankou pluton is produced by the partial melting of the middle Proterozoic Yangtze craton basement mixed with the enriched upper mantle. The Jiajika S-type granite is formed by partial melting of the upper crust, and is different from Songliankou pluton in terms of magma sources, evolution and mineralization tectonic conditions; this may be the main reason why the Songlinkou pluton does not have lithium rare metal mineralization.
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