Geochronology, geochemistry and petrogenesis of the Datonggou granitic plutons in the middle section of Altun Mountains
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摘要:
出露于阿尔金中段的大通沟花岗岩体，岩性主要为二长花岗岩，LA-ICP-MS锆石U-Pb年龄为（353.7±1.1）Ma。SiO2为74.5%~76.2%，Al2O3为12.62%~14.15%，（Na2O+K2O）为7.71%~8.29%，K2O/Na2O为0.9~1.22，A/CNK介于1.0~1.19之间，属高钾钙碱性系列的过铝质-强过铝质花岗岩。该岩石富集大离子亲石元素（LILE），亏损素Ba、Nb、Sr、P、Ti等高场强元素（HFSE）；∑REE变化范围大（∑REE=85.7×10-6~153.2×10-6，平均为111×10-6），具有强烈的负Eu异常（δEu=0.03~0.59，平均0.33），LREE/HREE=3.52~11.9，轻稀土相对富集，轻重稀土分馏明显。微量元素地球化学特征表明，其源区物质主要来源于上地壳的变杂砂岩和变泥质岩类。锆石饱和温度计演算结果显示锆石的结晶温度为722~745℃（平均735℃），估算二长花岗岩源区的压力为0.8~1.6 GPa。综合区域地质资料，阿尔金中段大通沟花岗岩体的形成与造山带根部块体的拆沉作用有关。
Abstract:The Datonggou granitic plutons, outcropped in the middle part of Altun Mountains, are principally composed of monzonite granite. The LA-ICP-MS zircon U-Pb isotopic dating indicates that the Datonggou monzonite granite was emplaced at (353.7±1.1) Ma. They have high-K cal-alkaline and strong peraluminous features (SiO2=74.5%-76.2%, Al2O3=12.62%-14.15%, (Na2O + K2O)=7.71%-8.29%, K2O/Na2O=0.9-1.22, A/CNK=1.0-1.19). The Datonggou granitic plutons are rich in large ion lithophile elements (LILE) and depleted in high field strength elements (HFSE) with a clear negative Ba, Nb, Sr, P, Ti anomaly. REE distribution patterns show strong negative anomaly of Eu (δEu=0.03-0.59) and distinct enrichment of LREE relative to HREE. The geochemical characteristics of trace elements indicate that the rocks were formed by partial melting of variable hybrid sandstone and variable mudstone from the upper crust. The partially melting temperature calculated by whole rock Zr thermometer is 722-745℃ and pressure is 0.8-1.6 GPa. Combined with the data from the Altun Mountains, it is held that the Datonggou granitic plutons in middle Altun Mountains might be related to the delamination of deep blocks under the Altun orogen.
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Key words:
- Altun Mountains /
- Early Carboniferous /
- peraluminous granites /
- geochemistry
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图 5 阿尔金中段大通沟花岗岩TAS图解（a）和SiO2-K2O图解（b）；(a，据Cox et al, 1979；b，据Rickwood, 1989；Ir-Irvine岩石系列分界线；A-碱性系列；S-亚碱性系列）
Figure 5.
图 6 阿尔金中段大通沟花岗岩A/NK-A/CNK图解（据Peccerillo et al, 1976）
Figure 6.
图 7 阿尔金中段大通沟花岗岩体球粒陨石标准化稀土元素球粒陨石标准化稀土配分图（a，标准化值据Sun et al, 1989）和原始地幔标准化微量元素蛛网图（b，标准化值据Sun et al, 1989）
Figure 7.
图 8 阿尔金山中段大通沟花岗岩体源区判别图（a，据Boztug et al, 2007; b，据Altherr et al, 2002）
Figure 8.
表 1 二长花岗岩LA-ICP-MS锆石U-Pb同位素分析结果
Table 1. LA-ICP-MS zircon U-Pb data of the monzonite granite
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表 2 阿尔金中段大通沟花岗岩体主量元素地球化学组成（%）
Table 2. Major element compositions of the Datonggou granitic plutons from the middle section of Altun (%)
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表 3 阿尔金山中段大通沟岩体微量元素分析结果（10-6）
Table 3. Trace element compositions of the Datonggou granitic plutons from the middle section of Altun (10-6)
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