收稿日期: 2024-05-20
修回日期: 2024-07-09
网络出版日期: 2024-09-19
基金资助
国家自然科学基金NSFC-山东省联合基金项目“胶东深部金矿断裂控矿机理”(U2006201);河北省人才项目“冀北地区金成矿系统及深部找矿技术”(HBQZYCXY0010);山东省地矿局科技攻关项目“胶西北断裂系统及其与金成矿关系”(KY202208);“伟德山期侵入岩岩浆演化与多金属成矿作用”(KY202209)
Geochronology,Geochemical Characteristics and Tectonic Implications of Early Cretaceous Zhouguan High-Mg Diorite Rock Mass in the Jiaodong Peninsula
Received date: 2024-05-20
Revised date: 2024-07-09
Online published: 2024-09-19
胶东地区是我国最重要的金矿集区,金矿床的时空分布与晚中生代花岗岩类密切相关,其中早白垩世伟德山期花岗岩侵位时间与大规模金成矿时间一致,是重要的成矿期地质体。隶属于伟德山期花岗岩的周官岩体与金成矿时空关系密切。选择周官岩体作为研究对象,系统开展了岩石学、锆石U-Pb同位素测年和全岩地球化学研究工作。结果表明:周官岩体侵位时代为(119.4±1.1)~(118±1.0)Ma,与金成矿同期;岩体具有低硅、高镁和富钠,以及相对高的Cr、Ni、Co、Sc含量、Sr/Y比值和明显贫化的Zr含量特征,Mg#值介于55.83~59.26,表现为高镁闪长岩特征。岩石属高钾钙碱性系列,为高镁闪长岩类,岩浆源于富集岩石圈地幔的部分熔融,并混染了部分地壳物质;周官高镁闪长岩体和伟德山期花岗岩的岩浆侵位导致地壳浅部发生剧烈隆起,形成伸展构造,为成矿流体运移、成矿物质富集和矿体定位提供了良好通道和有利空间。
王斌 , 宋明春 , 刘志宁 , 李健 , 董磊磊 , 张艺多 , 蒋雷 , 王润生 , 董小涛 , 刘家良 . 胶东地区早白垩世周官高镁闪长岩体年代学、地球化学特征及其构造意义[J]. 黄金科学技术, 2024 , 32(5) : 798 -812 . DOI: 10.11872/j.issn.1005-2518.2024.05.146
The Jiaodong region represents the most significant gold ore cluster in China,with the temporal and spatial distribution of gold deposits being closely associated with Late Mesozoic granites.The emplacement timing of the Early Cretaceous Weideshan granite aligns with the epoch of large-scale gold mineralization,marking it as a crucial geological body for ore formation.The Zhouguan rock mass,a constituent of the Weideshan granite,exhibits a strong spatial and temporal correlation with gold mineralization.Based on comprehensive studies encompassing systematic petrology,zircon U-Pb isotope dating,and whole rock major and trace element geochemistry,the Zhouguan rock mass was emplaced during the late Early Cretaceous period,specifically between (119.4±1.1)Ma and (118±1)Ma.This emplacement coincided temporally with gold mineralization events.The rock mass is characterized by low silicon (Si),high magnesium (Mg),and rich sodium (Na) content,along with relatively elevated concentrations of chromium (Cr),nickel (Ni),cobalt (Co),and scandium (Sc),as well as a high Sr/Y ratio and significantly depleted zirconium (Zr) content.These rocks are classified within the high-potassium calc-alkaline series and are identified as high-Mg diorite.The magma is derived from the partial melting of the enriched lithospheric mantle and incorporates some crustal materials.The emplacement of magma in the Zhouguan rock mass and Weideshan granite induced significant uplift of the shallow crust,leading to the formation of a series of extensional structures.These structures facilitated the migration of ore-forming fluids and created favorable conditions for fluid enrichment and orebody formation.
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