福建省上杭县罗卜岭斑岩铜钼矿床构造控矿规律研究
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The Regularity of Structural Controls on Ore Mineralization in the Luoboling Porphyry Cu Mo Deposit, Shanghang, Fujian
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    摘要:

    罗卜岭铜(钼)矿区位于紫金山矿田的东北部,是与晚中生代花岗闪长斑岩体有关的隐伏斑岩型铜钼矿床;主要斑岩矿体产于绿泥石化-绢英岩化和(弱)钾化-绢英岩化带中,矿石矿物组合为黄铜矿+辉钼矿;少量过渡类型矿体产于高级泥化带中,矿石矿物组合为蓝辉铜矿+铜蓝+辉钼矿。罗卜岭矿区地表露头含矿裂隙的统计结果显示,罗卜岭成矿晚期的含矿裂隙具有明显的方向性。远离斑岩体的含矿裂隙与其附近的区域构造方位或侵入体走向相近,表明受到北东向区域构造活动控制;而斑岩体西侧露头附近的含矿裂隙呈放射状,主要受到斑岩体侵入作用的影响。深部隐伏矿体则受到区域断裂和花岗闪长(斑)岩侵入体的共同控制,具体表现为:垂向上,以隐伏似斑状花岗闪长岩为中心,由深至浅,矿体铜钼品位比值依次变大,显示了Mo\\Cu Mo\\Cu(Mo)的元素垂向分带;平面上,铜、钼元素沿着北东向、北西向断裂和岩体接触带附近有明显富集;斑岩型铜钼矿体主要产于似斑状花岗闪长岩外接触带的花岗闪长斑岩中,形态和产状受到区域北东向断裂或岩体接触带构造影响;蓝辉铜矿体主要产于罗卜岭花岗闪长斑岩外接触带的花岗闪长岩体内,形态和产状受接触带控制。区域构造和斑岩侵入体对斑岩型铜钼矿化有不同的影响,浅部铜、钼矿化受区域断裂构造控制作用明显,而深部矿体主要受花岗闪长(斑)岩体和断裂构造共同控制。区域上北东向背斜构造和北东、北西向断裂构造控制了花岗闪长质侵入岩体的侵位,矿区尺度的断裂构造对斑岩体的就位和成矿作用有一定的影响,罗卜岭花岗闪长斑岩体及其接触带则直接控制了斑岩型矿体的产出,这一规律对紫金山矿田深部和外围隐伏斑岩型矿体的勘查工作具有重要的参考意义。

    Abstract:

    The Luoboling porphyry Cu Mo deposit is located in the northeast of the Zijinshan ore field. It is generally a buried porphyry Cu Mo deposit, which is associated with the late Mesozoic granodioritic porphyry. In the deposit, major porphyry orebodies, with the ore mineral assemblage of chalcopyrite molybdenite, occur in the chlorite phyllic and weak potassic phyllic alteration zones. The minor transitional orebodies, characterized by the digenite covellite molybdenite assemblage, are hosted in the advanced argillic alteration zone. The statistics of fissures on outcrops in the Luoboling deposit indicate that late stage ore bearing fissures of porphyry mineralization have obvious directionality. And the ore bearing fissures away from the porphyry intrusion show almost the same trend to the nearby regional faults and rocks, implying the significant structural controls by regional NE trending faults, while the fissures closed to the porphyry intrusion show radial distribution due to the impact of porphyry intrusion. Deep concealed ore bodies are under the dual control of regional faults and granodiorite porphyry intrusion. In the vertical, from deep to shallow, Cu Mo mineralizations show a zonation of Mo (Cu, Mo) Cu(Mo), with gradually increasing Cu/Mo ratios. On the plane, Cu and Mo are evidently enriched along the NE and NW trending faults and contact zones of granodioritic intrusions. The porphyry Cu Mo orebodies mainly occur in the granodioritic porphyry circling around the weakly porphyritic granodiorite, with shapes and occurrences mainly controlled by faults and the contact zones of granodioritic intrusions, and the digenite orebodies occur in the outer contact zone of the granodioritic porphyry, with shapes and occurrences consistent with those of the contact zone. Regional structure and porphyry intrusion have different influence on the porphyry Cu Mo mineralization. The Cu Mo mineralization at higher elevations is significantly affected by regional tectonic faults, however orebodies at lower elevations are controlled by both the granodioritic intrusions and faults. Regional NE striking anticline and faults controlled the emplacement of granodioritic intrusions, while the mine scale NE striking faults affected the emplacement and mineralization of the porphyry, and the granodioritic porphyry and their contact zone directly controlled the porphyry orebodies. These metallogenic rules are important for the exploration of the concealed porphyry orebodies in the deep and periphery of the Zijinshan ore field.

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赖晓丹,祁进平.2014.福建省上杭县罗卜岭斑岩铜钼矿床构造控矿规律研究[J].地质学报,88(10):1904-1916.
Lai Xiaodan.2014. The Regularity of Structural Controls on Ore Mineralization in the Luoboling Porphyry Cu Mo Deposit, Shanghang, Fujian[J]. Acta Geologica Sinica,88(10):1904-1916.

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  • 收稿日期:2013-12-25
  • 最后修改日期:2014-07-21
  • 录用日期:2014-11-03
  • 在线发布日期: 2014-11-17
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