【引用本文】 叶亚康, 周家云, 周雄, . 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[J]. 岩矿测试, 2020, 39(6): 921-933. doi: 10.15898/j.cnki.11-2131/td.202005060008
YE Ya-kang, ZHOU Jia-yun, ZHOU Xiong. Zircon LA-ICP-MS U-Pb Age and Geochemical Features of the Songlinkou Pluton, Western Sichuan[J]. Rock and Mineral Analysis, 2020, 39(6): 921-933. doi: 10.15898/j.cnki.11-2131/td.202005060008

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

收稿日期: 2020-04-17  修回日期: 2020-08-03  接受日期: 2020-09-19

基金项目: 中国地质调查局地质调查项目“格陵兰岛西南部稀土-铀矿产资源潜力评价”(DD20190446);中国地质调查局地质调查项目“四川九龙—可尔因大型锂资源基地综合调查评价”(DD20190185)

作者简介: 叶亚康, 硕士, 助理工程师, 主要从事矿床学、岩石学及相关研究。E-mail:835143358@qq.com

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

Received Date: 2020-04-17
Revised Date: 2020-08-03
Accepted Date: 2020-09-19

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εHft)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。

关键词: 松林口岩体, 锆石U-Pb年代学, 锆石Lu-Hf同位素, 地球化学, 稀有金属成矿

要点

(1) LA-ICP-MS锆石U-Pb年龄限定松林口岩体侵位时代为晚三叠世。

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.

KEY WORDS: Songlinkou pluton, zircon U-Pb chronology, zircon Lu-Hf isotope, geochemistry, rare metal mineralization

HIGHLIGHTS

(1) Zircon LA-ICP-MS U-Pb age indicated that the emplacement of the Songlinkou pluton was in the late Triassic period.

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Figures And Tables

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

叶亚康, 周家云, 周雄