地质通报2026，Vol.45Issue(5)：971-991,21.DOI:10.12097/gbc.2023.10.010
鲁东日青威盆地青山期基性岩浆驱动高温高压流体突破与裂缝充填特征
Characteristics of high temperature-high pressure fluid breakthrough and fracture filling driven by mafic magma in Riqingwei Basin,eastern Shandong Province
摘要
Abstract
[Objective]The Riqingwei Basin is located in the Rizhao-Qingdao-Weihai area,within the Sulu orogenic belt.During the Early Cretaceous Qingshan period,strong tectonic fluid activity occurred.Previous studies have shown that crustal thinning triggers a tectonic magmatic evolution sequence based on the crustal magma system in a basin,but there has been no research on the characteristics of high-temperature and high-pressure fluid breaking through surrounding rocks and corresponding crack filling under the driving force of basic magma.[Methods]Based on this,an investigation was conducted in the four areas of Dingzi Bay,Lingshan Island,Wulian,and Taolin in the basin,and five samples were obtained and analyzed for petrography,XRF,whole rock main and trace elements,rare earth elements,and gas-liquid inclusions.[Results]It was found that Mg and Fe elements were co enriched in the carbonate veins of Dingzi Bay,and P elements were significantly depleted.Lamprophyry and basalt belong to the same olivine crude basalt series and are rich in volatile components such as H2O and CO2.The distribution patterns of rare earth and trace elements in the Carbonate veins,lamprophyry and basalt are roughly the same.[Conclusions]Research has confirmed that the accumulation of light components(750℃≤T≤1300℃,P>>1000 MPa)at the top of the basalt magma reservoir in the study area has broken through the weak points of the surrounding rock,forming hidden explosive breccia.Subsequently,crystal differentiation produces lamprophore magma,which is locally immiscible and forms low viscosity gas hydrothermal fluid filled large pore sandstone,liquefying and enveloping it into cracks;The immiscibility effect caused by shallow cooling and pressure reduction generates a large amount of high-pressure gas hydrothermal fluid(T>354℃,P>>76.13 MPa),which breaks through the surrounding rock and forms hydraulic breccia veins.Finally,during the cooling and pressure reduction process,the cracks are filled with differentiated crystals in the order of quartz-ferromagnesian carbonate-calcite.关键词
基性岩浆/高温高压流体/岩浆—热液结晶序列/流—固作用/裂缝充填特征/成矿作用/山东Key words
mafic magma/high temperature-high pressure fluid/magmatic-hydrothermal crystallization sequence/fluid-solidus interaction/fracture filling characteristics/ore forming process/Shandong Province分类
天文与地球科学引用本文复制引用
高俊茹,周瑶琪,刘瑞杨,王克灏,夏静宇,李孙义,白冰洋,陈彤彤..鲁东日青威盆地青山期基性岩浆驱动高温高压流体突破与裂缝充填特征[J].地质通报,2026,45(5):971-991,21.基金项目
中国石油大学(华东)国家大学生创新创业训练计划资助项目《高温、超高压流体突破与裂缝充填特征分析》(编号:202101006)和中石化胜利油田分公司《沉积岩类干热岩 CO2-水-岩相互作用与热-流-固三场耦合模拟研究》(编号:30200018-25-ZC0613-0072) Supported by the National College Student Innovation and Entrepreneurship Training Program at China University of Petroleum(East China)(No.202101006)and Sinopec Shengli Oilfield Project(No.30200018-25-ZC0613-0072) （华东）
