Geochemical characteristics and metallogenic potential of Maoershan granite and its adjacent basement strata in Guangxi
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摘要:
通过对猫儿山花岗岩及其相邻基底地层进行地球化学与成矿潜力研究，发现猫儿山花岗岩具有高硅（SiO2=67.61%~83.16%）、富钾（K2O=3.75%~6.28%）、富铁（FeOT=1.85%~5.38%）、贫钠（Na2O=0.08%~3.06%）、贫镁（MgO=0.14%~1.28%）、过铝质（A/CNK的平均值为1.49）的特征，稀土元素总量较高，轻稀土富集，Eu显示负异常（δEu=0.15~0.46），为主要形成于后造山构造环境的强过铝质S型花岗岩。同时，猫儿山花岗岩及其相邻基底地层的元素组合、烃类组分具有继承性关系，花岗岩主要来源于基底地层的部分熔融，W、Sn、Bi具备良好的成矿潜力。换言之，基底地层不仅为大规模的岩浆活动提供了物质基础，同时也为花岗岩浆进一步分异形成钨锡多金属矿化（矿床）提供了成矿物质来源。
Abstract:Through studying the geochemical characteristics and metallogenic potential of Maoershan granite and its adjacent basement strata, it is found that the granite is characterized by high silicon (SiO2=67.61%-8.316%), rich potassium (K2O=3.75%-6.28%) and iron (FeOT=1.85%-5.38%), depleted sodium (Na2O=0.08%-3.06%), poor magnesium (MgO=0.14%-1.28%), peraluminous nature (the average of A/CNK being 1.49), relatively high total amounts of rare earth elements, and enriched light rare earth elements, with Eu negative anomaly (δEu=0.15-0.46), suggesting that it was formed in the post-orogenic tectonic environment and belonged to strongly peraluminous S-type granite. At the same time, the results show that the element assemblages and hydrocarbon composition of Maoershan granite and its adjacent basement strata had inherited relationship. The granite was mainly derived from the partial melting of the basement strata. W, Sn and Bi had good metallogenic potential. All these data show that the basement strata in this area not only provided a material basis for large-scale magmatic activities but also provided a source of ore-forming materials for further differentiation of granite pulp to form tungsten-tin polymetallic deposits.
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图 2 猫儿山花岗岩TAS图解（a，据Middemost，1994）、碱度率图解（b，据Wright，1969）和A/CNK-A/NK图解（c，据Miniar and Piccoli, 1989）
Figure 2.
表 1 猫儿山花岗岩主量元素分析结果（%）
Table 1. Analytical results (%) of major elements for granite in Maoershan
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表 2 猫儿山微量元素分析结果（元素单位：10-6，Au/10-9）
Table 2. Analytical results (unit for elements: 10-6, Au×10-9) of trace elements for the granite in Maoershan
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表 3 猫儿山花岗岩稀土元素分析结果（单位：10-6；据柏道远，2014）
Table 3. Analytical results (after Bai Daoyuan, 2014) of REE for the granite in Maoershan(10-6)
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表 4 猫儿山烃类组分分析结果（烃类组分单位：μl/kg）
Table 4. Analytical results of hydrocarbon (unit for hydrocarbon: μl/kg) for the granite in Maoershan
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表 5 猫儿山地区部分钨锡多金属矿（点）床分布特征（据杨振，2012）
Table 5. Distribution characteristics of partial tungsten-tin polymetallic (orepoint) deposits in Maoershan area (after Yang Zhen, 2012)
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