Age and origin of Mid-Pleistocene volcanic rocks from Qushi in Tengchong area, western Yunnan Province: SHRIMP zircon U-Pb dating and constraint from Hf-in-zircon isotopes
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摘要: 本文报道了腾冲曲石地区英安岩测年结果和该区火山岩样品的地球化学特征。英安岩(TC7)的SHRIMP锆石U-Pb年龄为0.41±0.01Ma(MSWD=1.18),属于中更新世,是迄今在国内测得的最年轻的高精度锆石U-Pb年龄。该区的火山岩具有高钾钙碱性的特点,为一套粗面玄武岩-玄武粗安岩-粗安岩-粗面岩以及玄武岩-安山岩-英安岩岩石组合。岩石富集LILE、LREE,相对亏损Nb、Ta、Ti等高场强元素,具有高的原始地幔标准化(Th/Nb)N比值(大于6)、低的Nb/La(小于1)和Nb/U比值(3~13),相对富集Zr,Zr/Y比值较高。这些地球化学特征明显区别于典型岛弧钙碱性火山岩。锆石Hf同位素分析结果显示εHf(t)值为-11.0~-1.5,变化较大;tDM1、tDM2分别为747~1115Ma、951~1437Ma,模式年龄远大于SHRIMP测定的锆石U-Pb年龄。腾冲火山岩喷发时该区属于大陆板内环境,该区火山岩与地壳混染的大陆玄武岩地球化学特征相类似,是幔源物质遭受壳源富集组分强烈混染的产物。Abstract: This paper reports U-Pb age and the geochemical characteristics of volcanic rocks from Qushi in Tengchong area. Mid-Pleistocene age (0.41±0.01Ma) of zircons in dacite (TC7) is yielded using SHRIMP in Beijing SHRIMP Center, which is the youngest high sensitive zircon U-Pb age in China by now. Whole rock analyses of major, trace elements for these rocks indicate they are high-K calc-alkaline series rocks including trachybasalt, basaltic trachyandesite, trachyandensite, trachyte and basalt, andesite, dacite. These rocks are enriched in LILE, LREE and low HFSE relatively, such as Nb, Ta, Ti. They have high Th/Nb values normalized by the primitive mantle and low Nb/La (εHf(t) values ranging from -11.0 to -1.5 and tDM2 modal age of 951~1437Ma, which is much larger than its real age. These geochemical features of the Tengchong volcanic rocks show an affinity with contaminated continental basaltic rocks. The volcanoes in Tengchong area erupted in an intraplate tectonic setting and their magma sources may have been strongly contaminated by large-scale crustal materials.
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Key words:
- Cenozoic volcanic rock /
- SHRIMP zircon U-Pb age /
- Hf isotope /
- Mid-Pleistocene /
- Magmatic origin /
- Qushi in Tengchong
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