| 胥飞,沈欢喜,杨金龙,石磊,聂张星.安徽东至县柴山含金岩体年代学、地球化学特征及成矿潜力[J].地质找矿论丛,2024,39(4):493-503 |
| 安徽东至县柴山含金岩体年代学、地球化学特征及成矿潜力 |
| Chronology, geochemical characteristics and ore-forming potential of Caishan Au-bearing intrusion in Dongzhi county, Anhui province |
| 投稿时间：2024-05-15 |
| DOI：10.6053/j.issn.1001-1412.2024.04.006 |
| 中文关键词: 花岗闪长岩 锆石U-Pb年龄 微量元素 金矿 安徽省 |
| 英文关键词:granodioritic porphyy zircon U-Pb age trace element Au ore Anhui province |
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| 中文摘要: |
| 长江中下游成矿带安庆—贵池矿集区发现众多金多金属矿床,其成矿作用与岩浆活动关系密切。矿集区南侧柴山地区发现了含金花岗闪长斑岩,岩体与蓝田组接触并形成了矽卡岩型钨、金矿。为了解岩体与区内金多金属矿化关系,探究其成矿潜力,文章通过含金岩体锆石U-Pb定年,测得柴山花岗闪长斑岩形成年龄147.5 Ma±1.5 Ma,与区域燕山期大量成岩成矿期峰值年龄较为一致。岩石地球化学显示:柴山岩体属于高钾钙碱性、钙碱性系列,具有过铝质特征,其特征显示为埃达克质岩。岩体稀土元素w(La)N/w(Yb)N和w(LREE)/w(HREE)值较大,表现为轻重稀土分异明显,稀土元素配分模型为轻稀土富集的右倾型,Eu中等负异常。岩石总体富集大离子亲石元素(Rb、Th、U、K),亏损高场强元素(Nb、Ti),与周边矿区成矿岩体的岩石地球化学特征相似。结合矿区地质特征,认为勘查区钨、钼、金等成矿与花岗闪长斑岩密切相关,指示柴山地区找矿潜力较大。 |
| 英文摘要: |
| Many metal ore deposits have been discovered in Anqing-Guichi ore deposit-clustered area in middle-lower reach ore belt of Yangtze river. The ore-forming process is closely related to magnetic activity. In the southern side of the ore deposit-cluster area Au-bearing granodioritic porphyry has been found. At the contact zone between the porphyry and strata of Lantian formation occur skarn type Au and W deposits. In order to understand relationship of the porphyry to poly-metallic mineralization and explore ore prospecting potential in the area zircon U-Pb age dating of porphyry was measured. The rock-forming age obtained is 147.5 Ma±1.5 Ma coincided with peak age of most Yanshanian rock-forming and ore-forming epoches in the area. Chaishan intrusion geochemically belongs to high K calci-alkali, calci-alkali serial rock, i.e. Adakite with peraluminous characteristics. The relatively big w(La)N/w(Yb)N and w(LREE)/w(HREE) values of the intrusion manifest differentiation of LEE and FREE. REE pattern of the intrusion is characterized by right incline type of LEE enrichment and medium Eu negative anomaly. Generally the intrusion is rich in large ionic lithophilic elements(Rb, Th, U, K) and high field strength elements(Nb, Ti) similar to geochemical characteristics of ore-forming intrusion in the surroundings. Combined with geological characteristics of the area we consider that the regional W, Mo and Au mineralization is closely related to the granodioritic porphyry and Chaishan area is potential for further prospecting. |
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