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摘要:
南岭科学钻探（NLSD-1）选址于江西省于都-兴国-宁都三县交界地区实施，构造上属华夏板块内部的武夷和罗霄两块体交汇部位。南岭科学钻探瞄准构造结合部区域地质问题和矿集区深部成矿预测两方面科学目标进行探索。NLSD-1开孔至1373.71 m揭露了连续的青白口纪地层，是一套完整的凝灰质火山碎屑岩韵律层，主要岩性有凝灰质粉砂岩、凝灰质细砂岩、变沉凝灰岩、凝灰质板岩和流纹岩。本次工作在科学钻探精细地质编录的基础上，对各类岩性地层进行镜下鉴定，并挑选流纹岩中的单颗粒锆石，应用LA-ICP-MS锆石U-Pb法进行定年，获得了一组高度谐和的同位素年龄，确定流纹岩成岩时代为381 Ma，为赣中南地区新元古代地层时代的进一步划分、归属和地质演化研究提供了新的信息。
Abstract:Nanling scientific drilling(NLSD-1)is located at the junction of Yudu-Ningdu-Xingguo county in Jiangxi Province. Tectonically,the hole site of NLSD-1 is located at the intersection of Wuyi and Luoxiao block inside the Cathaysian plate. NLSD-1 aims at solving the scientific problems of regional geology and metallogenic regularity in the ore concentration area. The NLSD-1 hole intersects Qingbaikouan strata at 1373.71 m which are composed of a rhythm layer of tuffaceous volcanic clastic rock consisting of tuffaceous siltstone, tuffaceous sandstone, variable tuff, tuffaceous slate and rhyolite. Based on detailed geological logging and identification of different kinds of lithostratigraphy under microscope, the authors selected zircons from the rhyolite of NLSD-1. A set of high harmonic isotopic ages were obtained by using LA-ICP-MS, which can be used to make sure that the formation age of rhyolite is 381 Ma. This datum provides new information for the further division, assignment and study of geological evolution of stratigraphic age of Late Proterozoic in the middle south area of Jiangxi Province.
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Keywords:
- Nanling /
- scientific drilling /
- Qingbaikouan System /
- rhyolite /
- zircon Pb-U method
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1. 研究目的（Objective）
研究区地处鄂尔多斯盆地北部伊盟隆起中部的塔然高勒地区，其东侧紧邻纳岭沟铀矿，西侧为大营铀矿，区内地层整体为一向西南缓倾的单斜构造，含铀目的层为中侏罗统直罗组下段。塔然高勒铀矿的发现有望使大营和纳岭沟相连，成为世界级的铀矿田。
2. 研究方法（Methods）
依靠煤田和石油勘查钻孔资料“二次”开发的创新性思路，中国地质调查局天津地质调查中心在鄂尔多斯盆地东北缘塔然高勒地区通过收集分析研究区煤田勘查、开发钻孔资料以及区域地质、矿产、物探、化探、遥感及水文地质等资料，开展铀矿战略选区；编制研究区目的层系列图件，分析铀矿成矿地质条件，圈定找矿靶区；优选放射性异常钻孔和成矿有利地段进行钻探施工，分析放射性异常和含矿目的层的空间位置以及矿体分布、矿石质量等特征，初步评价铀资源潜力。
3. 研究结果（Results）
排查研究区煤田测井资料，发现潜在铀矿孔164个，潜在铀矿化孔65个。自然伽玛强度值较高，放射性异常钻孔形态连片、成带特征明显，规模较大。通过对优选的放射性异常钻孔和成矿有利地段进行钻探施工，共发现铀矿工业孔14个，铀矿化孔26个，矿区达到大型铀矿产地规模；铀矿体平面上总体呈北东—南西向展布，矿体平均埋深526 m，由北东向南西方向埋深逐渐增大。垂向上，铀矿体主要赋存于中侏罗统直罗组下段下亚段的灰色砂体中，矿体形态为板状。矿石岩性为中粗粒砂岩，碎屑物胶结类型以接触式、孔隙式胶结为主，铀的存在形式以吸附态为主，含铀矿物主要为铀石。
研究区目前共圈定6个工业矿体，矿体厚度变化范围为1.30~7.50 m，平均值为4.33 m；矿体平均品位为0.0342%，矿体平米铀量变化范围为1.76~ 11.20 kg/m2，平均值为3.49 kg/ m2。
目前主要对研究区东部矿体进行钻探工程控制，而矿体向西南方向深部的延伸情况及其西部矿体的分布情况均未进行有效控制，矿区仍具有较大的铀矿找矿潜力。
4. 结论（Conclusions）
（1）鄂尔多斯盆地东北缘塔然高勒铀矿的发现拓展了该地区的铀矿找矿空间，扩大了鄂尔多斯盆地东北部铀资源基地规模。
（2）研究区与周边的大营、纳岭沟铀矿具有相似的优越铀矿成矿地质条件，铀源丰富、泥砂泥结构完整、辨状河道砂体发育，炭屑、有机质等找矿标志明显。通过加大该地区的铀矿调查力度，有望使该地区成为世界级铀矿田。
（3）该地区铀矿的发现是利用煤田资料“二次开发”技术思路快速寻找砂岩型铀矿的成功范例之一，该技术方法极大减少了铀矿调查周期，节省了大量勘查成本。
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图 1 塔然高勒研究区钻孔剖面图(a—南北向; b—东西向）Figure 1. Drilling profile of the Tarangaole area (a-in north-south direction; b- in east-west direction)5. 致谢（Acknowledgements）
感谢李建国、李效广及项目组成员的支持。
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图 1 南岭科学钻探位置及赣南银坑地区地质略图
Figure 1. Position of Nanling scientific drilling and geological sketch of Yinkeng in Gannan
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图 2 南岭科学钻探中的流纹岩
A—南岭科学钻探0~3000 m岩心柱状图；B—南岭科学钻探80~85 m岩心扫描图；C—流纹岩与凝灰岩整合接触；D—流纹岩；E、F—流纹岩显微结构照片
Figure 2. Liparite in Nanling scientific drilling
A-0~3000 m core column in Nanling scientific drilling；B-80~85 m core scan map in Nanling scientific drilling；C-Conformable contact with rhyolite and tuff；D-Rhyolite；E,F-Pictures of the microstructures of rhyolite
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图 4 典型的锆石阴极发光图和U-Pb测点数据
Figure 4. Typical zircon CL images,analyzed spot and 206Pb/238U age
表 1 流纹斑岩锆石LA-MC-ICP-MS分析数据
Table 1 LA-MC-ICP-MS zircon analytical data for rhyolite porphyry from NLSD-1
下载: 导出CSV
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