青藏高原北羌塘祖尔肯乌拉山地区查保马组陆相火山岩地球化学特征及锆石U-Pb测年

王钊飞; 曹波; 陈炳锦

青藏高原北羌塘祖尔肯乌拉山地区查保马组陆相火山岩地球化学特征及锆石U-Pb测年

西北有色地质勘查局七一一总队, 陕西汉中 723000

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- 收稿日期: 2015-05-02
- 修回日期: 2015-07-19
- 发布日期: 2015-12-04

The Geochemical Characteristics and Zircon U-Pb Dating of the Miocene Continental Volcanic Rocks from Chabaoma Formation in the Mt. Jurhen Ul Area of North Qiangtang,Qinghai-Tibetan Plateau

No. 711 General Party, Northwest Nonferrous Geological Exploration Bureau, Hanzhong 723000, Shaanxi, China

摘要

摘要: 祖尔肯乌拉山地区查保马组陆相火山岩岩石类型主要为粗安岩和安山岩,属新近纪中新世。地球化学特征显示:主量元素SiO₂含量为42.45%~62.60%,绝大部分为58.08%~62.60%,相对富集FeO、MgO、K₂O、TiO₂、P₂O₅,属幔源岩浆岩系列。里特曼指数σ=2.87~3.41,平均3.19,属于钙碱性岩系。火山岩的全碱(Na₂O+K₂O)含量高,且Na₂O-22O,K₂O/Na₂O=1.12~1.43,属钾玄岩系;微量元素强不相容元素Rb、Ba、Th、U、K呈强富集,弱不相容元素Ta、Nb、La、Ce、P、Zr、Hf、Sm弱富集,过度元素Ti、Y、Yb弱亏损,相容元素Lu强亏损。富集强不相容元素,指示火山岩源区为富集地幔(EMⅡ);稀土元素为右倾型,轻重稀土分馏显著,具有弱的负Eu异常特征,显示岩浆在上涌过程中有地壳的物质混入,发生同化混染作用。构造环境分析为板内。根据ICP-MS锆石U-Pb法测得火山岩锆石结晶年龄为(20±1)Ma,属新近纪中新世。
- 祖尔肯乌拉山 /
- 中新世 /
- 查保马组 /
- 火山岩 /
- 锆石U-Pb测年
Abstract: In the Chabaoma Formation of Mt. Jurhen Ul area,the main rock types of continental volcanic rockare latite and andesite,which were formed in Neogene-Miocene epoch. The geochemical characteristics indicate that the contents of SiO₂(main element)range from 42.45% to 62.60%, and most of them are 58.08%-62.60%, which is relatively higher than the ones of FeO, MgO, K₂O, TiO₂ and P₂O₅, suggesting these rocks belong to the ones of mantle-derived magmatic rock series. The values of σ(Litman index) are 2.87-3.41, with an average of 3.19, showing these rocks have the characteristics of calc-alkaline rock series. The total alkali(Na₂O+K₂O) contents of these volcanic rocks are high, the contents of Na₂O-2 are less than the ones of K₂O, and the ratios of K₂O/Na₂O are 1.12-1.43, suggesting theses rocks belong to shoshoniteseries.For the trace elements, the strong incompatible elements(such as Rb, Ba, Th, U and K) showstrong enrichment, but the weakly incompatible elements(Ta, Nb, La, Ce, P, Zr, Hf and Sm) show weak enrichment, while the transition elements(Ti, Y and Yb) are weakly less, and the compatible element(Lu) is strong loss.The strong enrichment of incompatible elements reveal that these volcanic rocks were soured from the enriched mantle(EM II). The distribution model of REE is right abligue in the orientation, with significant REE fractionation and weak negative Eu anomalies, suggesting that the crustal material had mixed into the magma during the upwelling process, which lead to the occurring of assimilation and hybridization. The analysis show that, these rocks formed in an intraplate setting. The ICP-MS zircon U-Pb dating reveals that the crystallization ages of these volcanic rocks are 20±1Ma, belonging to the Miocene Epoch of Neogene Period.
- Mt. Jurhen Ul /
- Miocene /
- Chabaoma Formation /
- volcanic rocks /
- zircon U-Pb dating

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青藏高原北羌塘祖尔肯乌拉山地区查保马组陆相火山岩地球化学特征及锆石U-Pb测年

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The Geochemical Characteristics and Zircon U-Pb Dating of the Miocene Continental Volcanic Rocks from Chabaoma Formation in the Mt. Jurhen Ul Area of North Qiangtang,Qinghai-Tibetan Plateau

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