| 赵宝聚,毕乃双,高明波,李大兜,李洁,李建.胶莱盆地东北缘土堆—龙口金矿床脉岩成因及与金矿化的关系讨论[J].矿产勘查,2025,16(8):2010-2025 |
| 胶莱盆地东北缘土堆—龙口金矿床脉岩成因及与金矿化的关系讨论 |
| Discussion on the origin of vein rocks and its relationship with gold mineralization in Tudui-Longkou gold deposit on the northeastern margin of Jiaolai Basin |
| 投稿时间：2024-03-04 |
| DOI：10.20008/j.kckc.202508016 |
| 中文关键词: 中生代脉岩 岩石地球化学 金矿化 土堆—龙口金矿 胶莱盆地东北缘中图分类号:P618.51文献标志码:A文章编号:1674-7801(2025)08-2010-16 |
| 英文关键词: Mesozoic dike petrogeochemistry gold mineralization Tudui-Longkou gold deposit northeastern margin of Jiaolai basin |
| 基金项目:本文受山东省地质矿产勘查开发局2020年度局控地质勘查与科技创新项目(202004)资助。 |
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| 中文摘要: |
| 脉岩和金矿化之间在时间与空间上的关联历来是地质学研究焦点之一。地处华北板块及苏鲁—大别造山地带接触部位的胶莱盆地东北缘，是牟—乳金矿带的重要组成部分，然而对于该区域深源中基性岩脉与金矿化关联性的研究还不够深入。本研究深入剖析了土堆—龙口金矿区及其深部外围脉岩在岩石学和地球化学方面的特征，目的在于探索其成因与源区性质，并进一步探讨这些脉岩与金矿化的关系。研究表明:研究区内脉岩总体属于钾质钙碱性系列，高镁、铁、铝等元素，钛元素的含量相对较低，富集轻稀土元素以及亲和大离子的元素，相对亏损高场强元素；脉岩初始岩浆为弥散状角闪石相橄榄岩富集地幔部分熔融作用的产物，在渗透至地表的途中没有受到地壳成分的干扰。区内研究的脉岩均源出自深部同一岩浆源区，是源自同一个母岩熔岩逐步分化与演变的结果，其形成跨度自晚侏罗世延续到早白垩世。脉岩与金矿的成矿年龄大致相仿，脉岩的入侵及成矿过程基本同步，同属一次特定构造活动的结果。 |
| 英文摘要: |
| The correlation between porphyry and gold mineralization in time and space has always been one ofthe focuses of geological research. The northeast margin of the Jiaolai Basin, located at the contact part of the NorthChina plate and the Sulu-Dabie orogenic, is an important part of the MouPing-RuShan gold ore belt. However, theresearch on the relationship between the deep-source mafic veins and gold mineralization in region is not deepenough. We conducted petrological and geochemical analyses on dikes from the Tudui-Longkou deposit and its pe-riphery to determine their origin, source, and link to mineralization. Results indicate these potassic calc-alkalinedikes are high in Mg-Fe-Al, low in Ti, enriched in light rare earth elements and large-ion lithophile elements, butdepleted in high field strength elements. The primary magmas formed by partial melting of an enriched mantle androse without significant crustal contamination. The pulse rocks studied in the area are derived from the same deepmagma source, are the result of gradual differentiation and evolution of a single parent magma, their formation spansfrom the Late Jurassic to the Early Cretaceous. The intrusive rocks and the gold deposits are of the same genetic age,and the intrusion and ore-forming processes are basically synchronous, belonging to the of a specific tectonic activity. |
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