The Forming Age and Geological Characteristics of the Metamorphic Intrusion of Hualong Rock Group in the Eastern Tectonic Belt of Nanshan,Qinghai
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摘要: 化隆岩群作为青海南山构造带的基底岩系，对其形成时代还存在较大争议。笔者通过对侵入于华隆岩群的片麻状花岗岩进行岩石学、年代学和岩石地球化学研究，显示岩石具高硅、富铝、贫钾、低磷和钛的特征，SiO2含量为69.48%，K2O含量为2.35%，K2O/Na2O值为0.59，（Na2O+K2O）值为6.27%，MgO含量为1.32%，Al2O3含量为13.68%，属中钾钙碱性过铝质系列。稀土元素含量较低，∑REE为253.77×10-6，岩石稀土元素配分曲线表现为轻稀土元素富集的右倾型，具中等程度的Eu负异常。微量元素显示富集大离子亲石元素Th、U、Ba，与相邻元素相比，明显亏损K、P、Ti元素，相对亏损Rb、Sr，具Zr、Hf正异常，具有A型花岗岩特征。片麻状花岗岩的形成时代为（701±63）Ma。结合地球化学特征及区域岩浆活动事件，认为化隆岩群片麻状花岗闪长岩形成于板内伸展环境，是罗迪尼亚超大陆裂解事件在祁连陆块中的岩浆活动响应。Abstract: Hualong rock group is the basement rock of Nanshan tectonic belt in Qinghai province.Its formation age remains controversial.This paperstudied the gneissic granodiorite, which intruded into Hualong rock group, through petrology, chronology and petrogeochemistry.The research shows that the rock has high SiO2 and Al2O3, and low K,P,Ti.The content of SiO2 is 69.48%, of K2O, 2.35%, of K2O/Na2O, 0.59,of (Na2O+K2O), 6.27%, of MgO, 1.32%, of Al2O3, 13.68%, belonging to mid-K calc-alkaline and prealuminous series.The content of rare earth elements is lower,∑REE being 253.77×10-6.The rock is enriched in LREE and depeleted in HREE.The REE patterns show rightward incline and moderate negative Eu anomaly.Compared with the adjacent elements,the trace elements show enrichment of LILE(Th,U,Ba),evident depletion of K,P,Ti, and relative depletion of Rb,Sr.Zr and Hf were positive anomaly.The rock has the characteristics of A-typegranite with the forming age of(701±63) Ma.Combined with the geochemical characteristics and regional magmatic activity events, it is held that the gneissic granodiorite was generated in an extensional environment, being the magmatic activity of the Rodinia supercontinent cracking event in Qilian block.
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Keywords:
- Hualong rock group /
- zircon U-Pb dating /
- geochemistry /
- gneissic granodiorite /
- Qilian block
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