东天山寨北山花岗岩年代学、地球化学特征及其与铜矿床的关系

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Zhiyuan Sun, Tao Yang, Jingyu Zhao, Yonggang Sun, Xinfa Li, Xiaoqiang Zhu
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引用次数: 0

摘要

寨北山铜矿床位于东天山阿奇山—亚曼苏成矿带的东段。研究了寨北山花岗岩锆石U-Pb年代学、主微量元素、Sr-Nd同位素特征及其与成矿作用的关系。SHRIMP锆石U-Pb测年表明花岗岩的侵入时间为早石炭世(334.5±2.6 Ma)。化学性质上,寨北山花岗岩硅(71.50 ~ 75.06%)、铝(A/CNK = 1.02 ~ 1.23)、钠(Na2O/K2O = 0.95 ~ 23.83,平均6.89)、总碱(Na2O + K2O = 6.65 ~ 8.43%)含量高,镁(<1%)、钛(<1%)含量低。球粒陨石归一化稀土模式的特征是LREE相对于HREE富集(LaN/YbN = 4.05 ~ 6.85), δEu = 0.38 ~ 0.73)呈中等负异常。寨北山花岗岩表现出K、Rb(大离子亲石元素)、LREE富集,Nb、Ta、Ti、P(高场强元素)富集,具有岛弧岩浆特征。Sr-Nd的ISr值为0.70473 ~ 0.70551,εNd(T)值为2.3 ~ 3.2。认为寨北山花岗岩形成于俯冲带的大陆弧背景下,可能是壳幔岩浆混合作用的产物,并经历了随后的分离结晶过程。结合流体包裹体及已公布的成矿年龄和同位素资料,认为寨北山铜矿区深部可能存在斑岩成矿和隐伏铜矿体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Geochronology and Geochemistry of Zhaibeishan Granite and Its Relationship with Copper Deposit in the Eastern Tianshan, NW China

Geochronology and Geochemistry of Zhaibeishan Granite and Its Relationship with Copper Deposit in the Eastern Tianshan, NW China

The Zhaibeishan copper deposit is located at the eastern part of Aqishan-Yamansu metallogenic belt in eastern Tianshan. Zircon U-Pb geochronology, major and trace element, and Sr-Nd isotopic characteristics of Zhaibeishan granite and its relationship with mineralization have been studied. SHRIMP zircon U-Pb dating indicates an Early Carboniferous intrusive time (334.5 ± 2.6 Ma) of the granite. Chemically, Zhaibeishan granites have high silica (71.50–75.06%), aluminum (A/CNK = 1.02–1.23), sodium (Na2O/K2O = 0.95–23.83 with 6.89 on average), and total alkalis (Na2O + K2O = 6.65–8.43%), and low magnesium (<1%) and titanium (<1%) contents. The Chondrite-normalized REE patterns are characterized by enrichment of LREE relative to HREE (LaN/YbN = 4.05–6.85) with moderate negative Eu anomalies (δEu = 0.38–0.73). The Zhaibeishan granites show enrichment of K, Rb, (Large Ion Lithophile Elements), LREE and depletion of Nb, Ta, Ti, and P (High Field Strength Elements), indicating island arc magmatic characteristics. Sr-Nd isotopic data reveal that the ISr values range from 0.70473 to 0.70551, while εNd(T) values range from 2.3 to 3.2. We suggest that the Zhaibeishan granites formed in continental arc setting in subduction zone and were probably derived from the product of magma mixing between crust and mantle magmas and experienced subsequent fractional crystallization. Combined with the fluid inclusion and published ore-forming age and isotopic data, we suggest that porphyry mineralization and blind copper orebodies probably exist in the deep part of the Zhaibeishan copper mining area.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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