| 陈国勇.黔西北地区隆起裂陷、逆冲推覆作用与铅锌成矿关系[J].地质与勘探,2022,58(4):703-718 |
| 黔西北地区隆起裂陷、逆冲推覆作用与铅锌成矿关系 |
| Relationship between uplift rifting, thrust nappe and lead-zinc mineralization in northwestern Guizhou Province |
| 投稿时间：2021-11-14 修订日期：2022-04-21 |
| DOI：10.12134/j.dzykt.2022.04.001 |
| 中文关键词: 铅锌矿 隆起 裂陷 褶皱倒转 逆冲推覆 黔西北 |
| 英文关键词: lead-zinc deposit, uplift, rifting, fold inversion, thrust nappe, northwestern Guizhou Province |
| 基金项目:贵州省地质矿产勘查开发局重大科研专项（编号：黔地矿纪要[2015]14号） |
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| 中文摘要: |
| 黔西北地区是上扬子西缘成矿带重要矿集区，区内分布许多大中型铅锌矿床，其构造复杂，找矿难度大。为实现黔西北地区铅锌找矿突破，系统收集该区及邻区勘查和研究资料，通过类比美国密西西比地区铅锌矿床和相邻云南矿山厂、麒麟厂、毛坪等铅锌矿床，结合在黔西北地区实施的调查和勘查项目，开展野外调查和取样测试等，解剖区内典型矿床；以地史时期构造演化为线索，探索黔西北地区地壳裂陷、地壳隆升、玄武岩浆喷发、地层褶皱倒转、逆冲推覆与铅锌成矿关系。研究表明，海西期裂陷作用产生裂陷槽，深部成矿流体沿裂陷槽边界断裂上升，Pb、Zn等组分在裂陷槽内与岩层同沉积，形成高含量背景层；裂陷槽两侧地壳隆升拉张变薄，玄武岩浆喷发，强大的岩浆热能驱动，岩层中Pb、Zn等组分与岩浆携带的含矿热液，运移至垭都-紫云等大断裂及次级断裂、断裂旁侧的有利岩层中聚集，形成铅锌矿体（矿化）；印支早期构造运动，地层褶皱倒转、断裂、逆冲推覆，沿断裂上升的含矿热液，改造早期的铅锌矿体（矿化）。该区的铅锌矿床不属于MVT型，是叠加（复合/改造）型矿床。印支晚期、燕山期、喜山期的构造运动，没有明显铅锌成矿作用发生，破坏早期形成的矿床。 |
| 英文摘要: |
| Northwest Guizhou Province is an important ore concentration area on the western margin of the Yangtze metallogenic belt. It hosts many large and medium-sized lead-zinc deposits, with complex structures and great prospecting difficulty. Aiming at achieving prospecting breakthrough, this work collected full exploration and research data in northwest Guizhou Province and adjacent areas, and compared with the lead-zinc deposits in Mississippi and Kuangshanchang, Qilinchang and Maoping in Yunnan Province. In combination with the investigation and exploration projects implemented in northwest Guizhou, field investigations and sampling tests were conducted to analyze typical deposits in the area. From the view of tectonic evolution during geological period, this work explored the relationship of crustal rifting, crustal uplift, basaltic magma eruption, stratigraphic fold inversion, thrust nappe and lead-zinc mineralization. The Hercynian rifting resulted in rifting troughs, and deep ore-forming fluids rose along the fracture boundary of rifting troughs, when Pb, Zn and other components were syndeposited with the rock strata to form high element background. Then, the crust on both sides of the rift trough rose, stretched and became thin, and basaltic magma erupted. Driven by strong magmatic heat energy, Pb, Zn and other components in the rock layer and the ore-bearing hydrothermal solution migrated to the favorable rock layers of the Yadu-Ziyun and other large faults, secondary faults and faults side, forming lead-zinc ore bodies (mineralization). During the Early Indosinian tectonic movement, the early lead-zinc ore bodies (mineralization) were transformed by stratigraphic fold inversion, faults, thrust nappe, and ore-bearing hydrothermal fluids along the faults. The lead-zinc deposits in this area do not belong to the MVT type, and are superimposed (composite / reformed) deposits. The late Indosinian, Yanshanian and Himalayan tectonic movements did not form obvious lead-zinc mineralization but destroyed the early formed deposits. |
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