江西省会昌县杨叶地区花岗岩地质地球化学特征及找矿预测研究
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摘要
江西省会昌县杨叶地区地处武夷山隆起地带的西侧,属于南岭成矿带中东部。区域构造上位于“南岭纬向构造带”的东段部分、“武夷山北东-北北东构造带”的南段。本论文结合生产实际,通过对区域成矿背景、矿区地质特征以及地球化学测量等研究,着重研究了区内花岗岩的地球化学特征,指出了区内的成矿潜力,预测了成矿靶区。
     研究表明,矿区出露地层为震旦统下坊组条带状钾长变粒岩、黑云母钾长变粒岩。矿区褶皱构造不发育,主要发育断裂构造,按走向可分为北西向、北东向及北北西向三组断裂。区内出露的花岗岩为富城超单元西侧一部分,岩性主要为浅肉红色黑云母斑状花岗岩、肉红色黑云母钾长花岗岩。
     对区内花岗岩进行详细的岩石地球化学研究显示,本区花岗岩具有贫钙、富钾、K2O> Na2O、o=1.88~2.31,强过铝质等特点,属于钙碱性花岗岩。岩体分异指数高、固结指数低,反映出岩体分异程度高,结晶演化彻底。岩石的化学成分与Chappell等划分的“S”型花岗岩相当,物质来源可能是上地壳物质的重熔。花岗岩稀土总量为236.17×10-6和166.13×10-6,富集轻稀土,δEu值为0.20和0.88,具有明显的Eu负异常,与陆壳改造型花岗岩相当。稀土标准配分模式图表现为向右倾斜“V型”曲线,显示出“S”型花岗岩特点。微量元素中明显富集Rb、Th、Ta、Nd,强烈亏损Ba、Nb、Sr, Rb/Ba、Rb/Sr比值明显高于中国花岗岩平均值,而Nb/Ta比值明显低于中国花岗岩平均值,表明岩体经过了强烈的分异,演化程度高。同时,岩体中具有较高的W、Zn、Pb、Cu等金属元素丰度值,可为本区成矿提供一定的金属元素。以上特征表明区内花岗岩极可能成为本区矿化的母岩,显示了本区成矿的巨大潜力。
     岩石地球化学测量圈定了多处金属异常区,异常强度较大的主要有金、银、钨、铅等,显示了成矿的可能性。通过地学统计规律,显示本区可能存在多期次的成矿作用。
Yangye County of Jiangxi Provience is located in the western of Wuyi Mountain.and belongs to the middle-eastern of Nanling metallogenic belt, eastern of Nanling Latitudinal belt and southern of Wu yi Mounain NE-NNE tectonic belt.Through out studying regional metallogenic geological setting,geology and geochemical surveying,and focusing on the geochemical characteristics of granites,we point out the mineralization potential of the region and predicte mineralization target.
     The rock of the area is characterized by banding potash-granulitite and biotite-potash-granulitite of Xiafang Formation,Sinian Period.The structure is dominated by NW-NE-NNW trend of faults.The Yangye intrusion, west part of Fucheng Super-unit, is mainly yellowish-pink biotite porphytitic granites and pink biotite potash-granites.
     Geochemical data shows that the rockbody is characteristics with rich in aluminum and potassium, K2O>Na20, a=1.88-2.31, poor in calcium.The granites is belongs to cal-alkaline series.The rockbody has a high differentiation index value and low consolidation index value,indicating high degree of crystallinity evolution. The chemical composition is considerable with S-type granites by Chappell etc.The genetic is caused by metasomatism.The tatol REE content of granites body are 236.17x10-6and 166.13×10-6, rich in LREE,8Eu value of 0.20 and 0.88, with an obviouse negative Eu anomalies.The characteristic indicates a genetic of transformation continental crust-type granites.There is a right-dipping V-type standard REE distribution paterns,showing the S-type granite characteristics. Trace elements are enriched in Rb、Th、Ta、Nd, and depleted in Ba、Nb、Sr.The Rb/Ba、Rb/Sr ratios are higher than the average values of China.but the Nb/Ta ratios lower than the average values of China.All that characteristers show that the rockbody have a high degree of crystallinity evolution.The granites maybe supply metal element for the mineralization,with high W、Zn、Pb、Cu.Hence the granites can become mother rocks of mineralization.and this shows the great potential mineralization in this area.
     Based on the rock geochemical measuring,Au、Ag、W、Pb etc.metal anomaly county were identified.indicating there are more potential mineralization in this area. The statistics law shows that there are maybe multiple episodes of mineralization in this area.
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