冀东卧龙岗铜矿多方法年代约束及对区域成矿的启示

曾智豪; 冯钊; 李天琦; 李随民; 李樋; 马玉伟; 田大争

doi:10.19509/j.cnki.dzkq.tb202601034

冀东卧龙岗铜矿多方法年代约束及对区域成矿的启示

doi: 10.19509/j.cnki.dzkq.tb202601034

曾智豪^1,,
冯钊^2,,
李天琦^3, ,,
李随民^2, ,,
李樋^2,,
马玉伟^3,,
田大争^3,

1.
1. 河北地质大学
2.
1. 河北地质大学
2. 河北地质大学资源与环境研究所
3.
3. 河北省地质工程勘查院

基金项目: 2025年省属高等学校基本科研业务费研究项目（QN25011）；河北省斑岩型矿床研究重点实验室项目（HBBY202405）；河北省自然资源厅科技项目（Z2025058）

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出版历程
- 收稿日期: 2026-01-19
- 录用日期: 2026-03-31
- 修回日期: 2026-03-30
- 网络出版日期: 2026-04-02

Multi-method dating constraints of the Wolonggang copper deposit in eastern Jidong and their implications for regional metallogenesis.

Funds: 2025 Fundamental Research Funds for Provincial Universitie(QN25011);Hebei Provincial Key Laboratory of Por-phyry Deposits(HBBY202405);cience and Techno-logy Project of Hebei Provincial Department of Natural Resource(Z2025058)

摘要

摘要:
【目的】冀东青龙卧龙岗岩体为燕山造山带中生代岩浆成矿集中区。针对不同温度窗口下岩浆—热液过程时间耦合不清、早白垩世构造转折对成矿贡献尚不明确的问题，本文旨在通过多体系年代学研究，明确中生代构造—岩浆—热液演化及成矿的阶段性联系。【方法】采集卧龙岗岩体及相关铜矿化样品，开展锆石U–Pb、绢云母⁴⁰Ar/³⁹Ar及磷灰石U–Pb定年，分别约束高温岩浆侵位、中温热液活动及低温热事件演化。【结果】锆石U–Pb定年显示岩体形成于中—晚侏罗世（171–159Ma），对应古太平洋板块俯冲引起的地壳挤压增厚阶段，为成矿前物质储备期。绢云母⁴⁰Ar/³⁹Ar年龄（159Ma）记录了与岩浆侵位相关的中温热液活动。磷灰石U–Pb定年识别出两期早白垩世热事件（136Ma、112Ma）：前者对应区域构造由挤压向伸展转折的初期，揭示深部系统在构造减压下“流体先行”特征；后者与区域成矿高峰及克拉通破坏峰值期一致，反映热重置及成矿系统再活化。【结论】卧龙岗矿床经历三阶段演化：中—晚侏罗世岩浆侵位储备期、早白垩世初期构造转折驱动的热—流体启动期、早白垩世晚期热叠加成矿期。不同定年体系反映不同温度窗口下的地质过程，为重建区域成矿框架及识别隐伏成矿系统提供重要年代学依据。
- 多体系年代学 /
- 构造转折 /
- 流体先行 /
- 热重置 /
- 卧龙岗矿床
Abstract:
【Objective】The Qinglong Wulonggang pluton in eastern Hebei, North China, represents a Mesozoic magmatic–mineralization concentration zone within the Yanshanian orogenic belt. Addressing the unresolved issues of the temporal coupling between magmatic–hydrothermal processes at different temperature windows and the unclear contribution of Early Cretaceous tectonic inversion to mineralization, this study aims to clarify the staged links among Mesozoic tectonics, magmatism, hydrothermal activity, and mineralization through multi-system geochronology.【Methods】Samples of the Wulonggang pluton and associated copper mineralization were collected for zircon U–Pb, muscovite⁴⁰Ar/³⁹Ar, and apatite U–Pb dating, constraining the evolution of high-temperature magmatic emplacement, medium-temperature hydrothermal activity, and low-temperature thermal events, respectively.【Results】ZirconU–Pb dating indicates that the pluton formed during the Middle–Late Jurassic(171–159Ma), corresponding to a crustal thickening stage induced by subduction of the Paleo-Pacific plate, representing a pre-mineralization material accumulation period. Muscovite ⁴⁰Ar/³⁹Ar ages (159Ma) record medium-temperature hydrothermal activity associated with magmatic emplacement. Apatite U–Pb dating identifies two Early Cretaceous thermal events (136Ma and 112Ma): the former corresponds to the initial stage of regional tectonic inversion from compression to extension, revealing a “fluid-first” feature of the deep system under decompression; the latter coincides with the regional mineralization peak and the craton destruction peak, reflecting thermal resetting and reactivation of the mineralizing system.【Conclusion】The Wulonggang deposit experienced three evolutionary stages: a Middle–Late Jurassic magmatic emplacement and material accumulation stage, an Early Cretaceous initial thermal–fluid activation stage driven by tectonic inversion, and an Early Cretaceous late-stage thermal superposition and mineralization stage. Different geochronological systems reflect geological processes at distinct temperature windows, providing critical temporal constraints for reconstructing the regional metallogenic framework and identifying concealed mineralization systems.
- multi-system geochronology /
- tectonic inversion /
- fluid-first /
- thermal resetting /
- Wulonggang deposit