Zircon U-Pb age and geochemical characteristics of Ordovician volcanic rocks from Kanasi area in Western Altay Mountains, Xinjiang
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摘要:
喀纳斯地区发育一套火山-沉积地层东锡勒克组，因缺少可靠的年龄和地球化学数据，其形成时代及地球动力学背景长期存在争议。为探讨这一问题，文章选择区内东锡勒克组一套层状分布的糜棱岩化英安岩作为研究对象，对其进行锆石LA-ICPMS U-Pb同位素定年，得到2件样品的206Pb/238U年龄分别为（445.4±3.1）Ma和（445.7±3.7）Ma，代表火山岩结晶年龄为晚奥陶世。这表明东锡勒克组地层形成于晚奥陶世。糜棱岩化英安岩SiO2含量为53.99%~71.04%，具有富铝（Al2O3=13.83%~16.27%），贫镁（MgO=1.09%~3.53%），K2O介于1.11%~3.83%，平均为2.84%，属于高钾质火山岩系列的特征；轻稀土富集，Eu负异常（δEu=0.65~0.82）；富集大离子亲石元素（Rb、Th、Ce）和亏损高场强元素（K、Nb、Ta），具有岛弧火山岩特征。结合区域地质特征，笔者认为该套火山岩形成于活动大陆边缘洋壳俯冲消减后期同碰撞的环境。晚奥陶世末古亚洲洋由南向北向西伯利亚板块之下俯冲形成具有活动大陆边缘弧性质的喀纳斯地区晚奥陶世火山岩。
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关键词:
- 阿尔泰山 /
- 喀纳斯地区 /
- LA-MC-ICP-MS锆石U-Pb年龄 /
- 地球化学 /
- 活动大陆边缘
Abstract:There is a suite of volcanic-sedimentary strata comprising Dongxileke Formation in Kanasi area; nevertheless, there is no accurate ages and geochemical study for these rocks. The genesis and geodynamical background are in controversy for a long time. To tackle these problems, the authors chose a layered mylonitic dacite in this area as the study object. LA-ICP-MS zircon U-Pb ages of(445.4±3.1)Ma and(445.7±3.7)Ma from two mylonitic dacite samples suggest that these volcanic rocks erupted in late Ordovician and that Dongxileke Formation was formed in late Ordovician. The mylonitic dacite is characterized by SiO2 content from 53.99% to 71.04%, high Al2O3 (13.83%-16.27%) and low MgO (1.09%-3.53%), with K2O between 1.11% and 3.83%, 2.84% on average, suggesting high alkline volcanic rock series. The mylonitic dacite forms a LREE-enriched distribution pattern with the existence of negative Eu anomaly (δEu=0.65-0.82). Geochemical characteristics of mylonitic dacite suggest island-arc volcanic features characterized by enrichment of LILE such as Rb, Th and Ce and depletion of HFSE such as K, Nb and Ta. Combined with regional data and the results obtained by this study, the authors consider that the volcanic rocks were generated during syn-collision of the late stage subduction in an active continental margin arc. The background was the conversion from the northward subduction of Paleo-Asia Ocean under the Siberia plate to Altay micro landmass land, which resulted in the formation of late Ordovician volcanic rocks in an active continental margin arc of Kanasi area.
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Key words:
- Altay Mountains /
- Kanasi area /
- LA-ICP-MS zircon U-Pb age /
- geochemical characteristics /
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图 5 喀纳斯地区糜棱岩化英安岩Nb/Y-Zr/TiO2图解（据Winchester et al., 1977）
Figure 5.
图 6 喀纳斯地区糜棱岩化英安岩SiO2-K2O图解（据Peccerillo et al., 1976）
Figure 6.
图 7 喀纳斯地区糜棱岩化英安岩A/CNK-A/NK图解（据Maniar et al., 1989）
Figure 7.
图 8 喀纳斯地区糜棱岩化英安岩稀土元素配分图（a）及微量元素蛛网图（b）（球粒陨石标准化值及原始地幔标准化值据Sun et al., 1989）
Figure 8.
图 11 喀纳斯地区糜棱岩化英安岩（Yb+Nb）-Rb（a）和（Yb+Ta）-Rb图解（b）（据Pearce et al., 1984）
Figure 11.
图 12 喀纳斯地区糜棱岩化英安岩R1-R2图解（据Batchelor et al., 1985）
Figure 12.
表 1 喀纳斯地区糜棱岩化英安岩主量元素组成（%）
Table 1. Major element (%) composition of mylonitic dacite in Kanasi area
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表 2 喀纳斯地区糜棱岩化英安岩稀土、微量元素组成（10-6）
Table 2. Trace element (10-6) composition of mylonitic dacite in Kanasi area
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表 3 糜棱岩化英安岩LA-ICP-MS锆石U-Pb同位素数据
Table 3. LA-ICP-MS zircon U-Pb isotopic data of mylonitic dacite in Kanasi area
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