Molybdenite Re-Os isochron age of the Chiwawu Mo-Cu deposit in Fuping County, Hebei Province in northern Taihang Mountains and its prospecting significance
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摘要:
赤瓦屋斑岩型钼铜矿床是太行山北段斑岩-矽卡岩成矿带内探明的一个中型钼铜矿床，钼铜矿体主要赋存于赤瓦屋岩体内部相的斑状花岗闪长岩中。为厘定赤瓦屋钼铜矿床的成矿时代和成矿物质来源，利用辉钼矿Re-Os同位素定年方法对赤瓦屋钼铜矿床中7件辉钼矿样品进行了成矿年代学测定，获得的模式年龄为129.1~130.6 Ma，年龄加权平均值为129.7±0.7 Ma，对应的等时线年龄为128.7±4.4 Ma，模式年龄和等时线年龄在误差范围内基本一致，指示赤瓦屋钼铜矿床形成于早白垩世。赤瓦屋钼铜矿床辉钼矿样品的Re含量为25.9×10-6~37.1×10-6，表明其成矿物质来源于壳幔混源。结合区域年代学资料，认为太行山北段成矿带在134~124 Ma存在一期岩浆热液成矿事件，斑岩铜矿型钼铜矿床的找矿潜力较大。
Abstract:The Chiwawu porphyry Mo-Cu deposit in the northern Taihang Mountains porphyry-skarn metallogenic belt is a medium-sized one discovered in recent years.The Mo-Cu orebodies are mainly hosted within porphyritic granodiorite of internal facies in Chiwawu pluton.In order to determine the age of mineralization and the source of molybdenum, seven molybdenite samples were collected from the Chiwawu Mo-Cu deposit for Re-Os dating.The Re-Os dating yields model ages ranging from129.1 Ma to130.6 Ma, with a weighted mean age of 129.7±0.7 Ma, and obtains an isochron age of 128.7±4.4 Ma.Evidently, model ages are consistent with isochron age within the error ranges, which constrains the ore-forming age of Chiwawu Mo-Cu deposit at the Early Cretaceous.The Re values of molybdenum vary in the range of 25.9×10-6~37.1×10-6, indicating that they were derived from mixing of crust and mantle sources.Combined with available chronologic data, it is recognized that a regional magmatic-metallogenic event might exist during the 134~124 Ma in northern Taihang Mountains.The prospecting potentiality of porphyry Cu-Mo deposits is great in this area.
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表 1 赤瓦屋钼铜矿床Re-Os同位素测试结果
Table 1. Molybdenite Re-Os isotope data of the Chiwawu Mo-Cu deposit
样品号 样重/g Re /10-6 普Os /10-9 187Re /10-9 187Os /10-9 模式年龄/Ma 测定值 2σ 测定值 2σ 测定值 2σ 测定值 2σ 测定值 2σ CWb31 0.03097 31.6 0.35 0.0062 0.0162 19831 222 43.20 0.26 130.6 2.1 CWb3 0.02012 37.1 0.29 0.0011 0.0602 23344 184 50.27 0.41 129.1 1.9 CWb9 0.02025 30.3 0.29 0.0011 0.0481 19067 182 41.07 0.25 129.2 1.9 CWb18 0.02018 26.2 0.21 0.0011 0.0476 16445 133 35.63 0.21 129.9 1.8 CWb24-1 0.02047 32.5 0.32 0.0011 0.0474 20409 200 44.16 0.30 129.7 2.0 CWk3 0.02004 27.2 0.21 0.0011 0.0141 17115 135 37.02 0.25 129.7 1.9 CWk6 0.02018 25.9 0.19 0.0011 0.0137 16278 119 35.19 0.24 129.6 1.8 
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表 2 太行山北段赤瓦屋和麻棚岩体及相关矿床测年数据
Table 2. Chronology data of Chiwawu and Mapeng intrusions and their related ore deposits in the northern Taihang Mountains
矿床及相关岩体名称 年龄/Ma 测试方法 参考文献 赤瓦屋钼铜矿床 128.7±4.4 辉钼矿Re-Os等时线法 本文数据 秋树林钼矿 129.06±1.13 辉钼矿Re-Os模式年龄 [10] 阎家沟钼矿 126.7±1.1 辉钼矿Re-Os等时线法 [10] 银洞钼矿 127.6 辉钼矿Re-Os模式年龄 [10] 赤瓦屋岩体 134±1 锆石LA-ICP-MS U-Pb法 [11] 133±1 锆石LA-ICP-MS U-Pb法 [11] 131±1 锆石LA-ICP-MS U-Pb法 11] 128±1 锆石LA-ICP-MS U-Pb法 [11] 134.0±5.3 锆石SHRIMP U-Pb法 [12] 139.8±3.1 锆石SHRIMP U-Pb法 [12] 126.4±2.4 锆石LA-ICP-MS U-Pb法 [13] 130±1.0 锆石LA-ICP-MS U-Pb法 [14] 128.2±1.5 锆石LA-ICP-MS U-Pb法 [14] 麻棚岩体 131±2 锆石LA-ICP-MS U-Pb法 [9] 131±2 锆石LA-ICP-MS U-Pb法 [9] 125±3 锆石SHRIMP U-Pb法 [36] 125.4±2 锆石LA-ICP-MS U-Pb法 [13] 126.2±2 锆石LA-ICP-MS U-Pb法 [13] 128.3±1.6 锆石LA-ICP-MS U-Pb法 [37] 125.1±1.1 锆石LA-ICP-MS U-Pb法 [37] 124.3±1.3 锆石LA-ICP-MS U-Pb法 [37]
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