| 尤世娜,方同明,高学泉,刘林生.北京延庆红石湾铂钯矿床含矿岩体的锆石 U-Pb年龄及其地质意义[J].矿产勘查,2025,16(12):2559-2567 |
| 北京延庆红石湾铂钯矿床含矿岩体的锆石 U-Pb年龄及其地质意义 |
| Zircon U-Pb dating of ore-bearing rocks from the Hongshiwan Pt-Pd deposit, Yanqing, Beijing: Constraints and geological significance |
| 投稿时间：2024-02-29 |
| DOI：10.20008/j.kckc.202512002 |
| 中文关键词: U-Pb测年 超基性岩 成矿时代 红石湾铂钯矿 北京延庆 |
| 英文关键词: zircon U-Pb dating ultramafic intrusion metallogenic age Hongshiwan Pt-Pd deposit Beijing Yanqing |
| 基金项目:本文受中国矿产地质志项目(DD20221695、DD20190379、DD20160346)和自然资源部深时地理环境重建与应用重点实验室开放基金项目(DGERA20251002)联合资助。 |
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| 中文摘要: |
| 北京延庆红石湾铂钯矿床属于岩浆型铜镍硫化物型矿床，成矿与红石湾岩体的侵位密切相关。红石湾岩体是燕山地区超基性岩的代表性岩体之一，岩体侵入于新太古代变质岩群中，被中元古界长城系底部的常州沟组石英砂岩沉积覆盖。按岩性特征可将该岩体分为角闪斜方辉石岩和角闪单斜辉石岩两个相带，铂钯矿化主要赋存在角闪斜方辉石岩中，但是岩体的形成时代还存在争议。本文通过对其含矿角闪斜方辉石岩中的岩浆成因锆石进行 LA-ICP-MS锆石 U-Pb同位素测定，获得含矿岩体中的锆石年龄为(2323±21)Ma，表明其成矿年代为古元古代。该研究为区内与超基性岩有关的成矿作用和岩浆活动提供了年代学资料。 |
| 英文摘要: |
| The Hongshiwan Pt-Pd deposit in Yanqing, Beijing, represents a typical magmatic copper-nickel sulfide deposit whose mineralization is genetically associated with the emplacement of the Hongshiwan pluton. Asone of the representative ultrabasicrock in the Yanshan region, the pluton intrudes into the Neoarchean metamor-phic rock series and is unconformably overlain by the Mesoproterozoic quartz sandstone of the Changzhougou For-mation at the base of the Changcheng System. Based on lithological characteristics, the pluton can be subdividedinto two facies zones: amphibolite and amphibolite-bearing clinopyroxenite. Platinum and palladium mineralizationis predominantly hosted within the amphibolite-clinopyroxenite unit. However, the precise emplacement age of thepluton remains debated. In this study, LA-ICP-MS zircon U-Pb isotopic dating was conducted on magmatic zirconsfrom the ore-bearing amphibolite-clinopyroxenite. The results yield a crystallization age of (2323±21) Ma, indicat-ing that the ore-forming event occurred during the Paleoproterozoic. These findings provide key geochronologicalconstraints on mineralization and ultrabasic-related magmatic activity in the study area. |
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