【摘要】 升深10井位于松辽盆地古中央隆起带北部,其揭示的基岩岩性为英安岩、碎裂蚀变凝灰岩夹绢云母板岩等,地质录井上对其年代归属存在较大分歧。选用当前年代地质学中广泛应用的锆石U-Pb定年方法,测定该套火山岩、火山碎屑岩夹浅变质岩的地质年龄。研究表明:所选测年样品来自其中的安山岩,所选测年锆石阴极发光图像显示岩浆生长成因的振荡环带,锆石测年结果显示两组谐和年龄,加权平均年龄分别为(255.4±2.6)Ma和(282.5±2.8)Ma;这两组火山岩的同位素年龄与大兴安岭地区二叠纪时期发生的两期(早二叠世大石寨期、晚二叠世林西期)火山喷发事件在时间上和空间上均具有很好的一致性,为二叠纪时期"佳—蒙地块"与华北板块、古亚洲洋板块相互作用的产物;255.4 Ma为英安岩结晶年龄,升深10井这一套含安山岩的基岩地层时代应属晚二叠世,区域上与林西组层位相当。更多还原

【Abstract】 Well Shengshen-10 is located in the north part of the Central Uplift of Songliao Basin, and the exposed lithologies by the well for the basement rocks are dacite, cataclastic altered tuff and sandwich sericite slate, there exists rather bigger disputing over the age attribution in the geological mud logging. The age determining method by the zircon U-Pb widely applied in the current time-geology was selected to detect and confirm the geological age of this set of the era volcanic rock, volcanic clastic rock and sandwich epimetamorphic rock. The study shows that the selected samples are from the andesite among the rocks, the selected age-confirming zircon cathodeluminescence(CL) images indicate the oscillatory rings reflecting the magmatogenic feature, the results of the zircon age conformance show that there are two groups of the harmonic age, the weighted average age can be divided into 255.4±2.6 Ma and 282.5±2.8 Ma; there are much better consistency in time and space between the isotope age in these two groups of the volcanic rock and two-period magma eruption events happened in Dashizhai period of Early Permian and Linxi period of Late Permian in Permian Daxing’anling Area, they are the interacted products between Permian "Jia-Meng Block" and North China Block and Paleo-Asian Ocean Plate; 255.4 Ma is the crystallization age of the dacite, the geologic age of this set of andesite-bearing basement rock can be considered as Late Permian in Well Shengshen-10, which is correlated with the time of Linxi Formation in region.更多还原