Zircon U-Pb ages, Hf isotopes and geochemical characteristics of volcanic rocks in Nagqu area, Tibet and their petrogenesis.
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摘要: 西藏拉萨地块北部广泛分布着中生代岩浆岩,然其岩浆源区和岩石成因仍存在多种争议。本文对那曲地区中酸性火山岩进行了全岩地球化学、LA-ICPMS锆石U-Pb年龄和Hf同位素的研究。结果显示:1)那曲地区粗面安山岩的时代为111.9±1.2Ma,英安岩为109.2±3.5Ma,二者在误差范围内一致,均为早白垩世;2)火山岩SiO2为51.88%~74.62%,具有低MgO 含量(0.37%~3.65%),并且样品大多显示较低的Mg#(16~40)值。岩石为过铝质特征,在原始地幔标准化蛛网图上显示Th-U正异常,而Nb、Ta、P、Ti等负异常。稀土元素整体表现为轻稀土富集、重稀土亏损的趋势,且轻重稀土分异程度强,(La/Yb)N=8.79~14.85,具负Eu异常(δEu=0.46);3)那曲中酸性火山岩体的锆石Ti温度计为720℃左右。锆石Ce(Ⅳ)/Ce(Ⅲ)εHf(t)值大多集中在-7.7~0.5之间,对应的Hf模式年龄(tDMC)为918~1336Ma。综合以上岩石学和地球化学数据,认为那曲中酸性火山岩为壳幔混合成因,可能是在班公湖-怒江洋壳南向俯冲引起板片断离背景下,羌塘与拉萨地块碰撞引起地壳加厚继而发生部分熔融,并加入了少量的受早期流体交代的安多微陆块古老岩石圈地幔物质,且其熔融产物经历了不同程度的分离结晶作用。
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关键词:
- 火山岩 /
- LA-ICPMS锆石U-Pb定年 /
- 那曲 /
- 拉萨地块北部
Abstract: The nature of magma source and petrogenesis of Cretaceous volcanic rocks widely distributed in the northern Lhasa subterrane have still mired in controversy. In this paper, we report zircon LA-ICP-MS U-Pb ages and Hf isotopic composition data, whole-rock major and trace element compositions of Early Cretaceous volcanic rocks in Nagqu, Tibet. The results show that: 1) Trachyandesites were formed in 111.9±1.2Ma while dacites formed in 109.2±3.5Ma based on LA-ICPMS zircon U-Pb dating; 2) These rocks show a slightly peraluminous signature with SiO2 (51.88%~74.62%), low MgO (0.37%~3.65%) and low Mg# (16~40) for most of samples, and also display positive anomalies of Th-U and negative anomalies in Nb, Ta, P, Ti in the primitive mantle-normalized trace element spidergrams, with obvious LREE and HREE fractionation ((La/Yb)N=8.79~14.85) and negative Eu anomalies (δEu=0.46) in the chondrite-normalized REE distribution patterns; 3)Temperature calculated by Ti-in-zircon thermometer is ca.720℃ and the Ce(Ⅳ)/Ce(Ⅲ) of zircon are generally less than 300, suggesting a magma source with low temperature and low oxygen fugacity; 4) Zircons have the negative εHf(t) values (from -7.7 to 0.5), corresponding to crustal Hf model ages of 918~1336Ma. Combining with petrology and geochemical characteristics, it has been suggested a mixing source from lower crust and depleted mantle for Nagqu volcanic rocks. They can be considered as the products of partial melting by the thickened lower crust in response to the continent-continent collision and fluid-modified ancient lithospheric mantle of the Amdo microcontinent and subsequent fractional crystallization.-
Key words:
- Volcanic rocks /
- LA-ICPMS zircon U-Pb dating /
- Nagqu /
- Northern Lhasa subterrane
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