Detrital Zircon U-Pb Geochronology and Provenance Tracing of the Fan Deltas along the Southwestern Slope of the Shijiutuo Uplift
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摘要: 为了示踪渤海湾盆地石臼坨凸起西南陡坡带扇三角洲源汇体系，对其东三段层序（Ed3）的6个砂岩样品进行碎屑锆石U-Pb定年分析.西部扇体（C6-4-4井）富含白垩纪（K）锆石并具有110 Ma峰值，母岩以白垩系义县组火成岩为主；中部（C6-4-3、C6-4-6D井）、东部扇体（C6-4-5D）富含侏罗纪（J）锆石并具有152 Ma或168 Ma峰值，母岩以侏罗系蓝旗组火成岩为主，古生代（Pz）锆石则来自中生界碎屑岩.所有样品都含有太古代（Ar）、元古代（Pt）锆石，母岩为花岗岩基底.研究表明，除古生界碳酸盐岩外，源区的母岩地层均可通过碎屑锆石U-Pb年龄示踪，各扇体物源的差异性是由母岩地层倾向控制的，由于中生界向西北倾斜，白垩系主控西部扇体沉积，侏罗系则是中部、东部扇体的主要物源区.Abstract: To trace sedimentary Source-to-Sink systems of the southwestern Shijiutuo uplift, Bohai bay basin, 6 sandstone cuttings from 3 fan deltas of the third member of Dongying Formation (Ed3), along the southwestern slope of Shijiutuo uplift, were systematically sampled for detrital zircon U-Pb dating analysis in this study. It is found that sediments of the western fan delta (C6-4-4) were characterized with abundant Cretaceous zircons and a notable peak at 110 Ma, controlled by volcanic rocks of Cretaceous Yixian Formation. The sediments of the middle fan delta (C6-4-3, C6-4-6D) and the eastern fan delta (C6-4-5D) were characterized by high percentage of Jurassic zircons and a 152 Ma or 168 Ma peak, dominated by volcanic rocks of Jurassic Lanqi Formation, while their Paleozoic zircons derived from the Mesozoic sedimentary rocks. Moreover, all the samples received Archean-Proterozoic zircons from the exposed basement. This study shows that all the source strata can be traced by detrital zircon U-Pb dating except for the Paleozoic carbonate. The diversity of the provenances of the fan deltas was controlled by the inclination of the source strata:as the Mesozoic strata inclined to northwest, the Cretaceous strata dominated the western fan delta while the Jurassic strata controlled the middle and eastern fan deltas.
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图 1 石臼坨凸起西部残余地层地质图及井位、地震剖面位置
岩性修改自庞小军等(2016)；沟谷修改自王启明等(2016)
Fig. 1. The geology map of the remaining strata on the western Shijiutuo uplift and the location of the wells and the seismic profiles
图 2 各井位东三段岩性及取样位置示意
红色星号为取样位置
Fig. 2. The Ed3 lithology of the wells and their sample depth
图 3 曹妃甸6-4构造东三段砂岩碎屑锆石Th/U比值
Fig. 3. The Th/U ratio of the detrital zircons of the Ed3 sandstone, CFD6-4
图 4 曹妃甸6-4构造东三段砂岩碎屑锆石U-Pb年龄含量分布
Fig. 4. The U-Pb age composition distribution of the detrital zircons of the Ed3 sandstone, CFD6-4
图 5 曹妃甸6-4构造东三段砂岩碎屑锆石U-Pb年龄谱图
n为年龄点个数
Fig. 5. The U-Pb age spectra of the detrital zircons of the Ed3 sandstone, CFD6-4
图 6 曹妃甸6-4构造过井地震剖面与残余侏罗系
剖面位置及图例见图 1
Fig. 6. The cross-well seismic profiles, CFD6-4 and the recovered Jurassic
表 1 曹妃甸6-4构造东三段砂岩碎屑锆石U-Pb年龄含量统计(%)
Table 1. The U-Pb age composition of the detrital zircons of the Ed3 sandstone, CFD6-4
井名 年龄(Ma) ＜140 ＜208 ＜250 ＜290 ＜362 ＜409 ＜439 ＜510 ＜570 ＜1 000 ＜1 800 ＜2 500 ＜2 500 Mz Pz2 Pz1 点数 K J T P C D S O ∈ Pt3 Pt2 Pt1 Ar C6-4-4 45 42.2 4.4 8.9 0.0 2.2 0.0 0.0 0.0 0.0 0.0 4.4 22.2 15.6 55.6 2.2 0.0 C6-4-3 71 4.2 19.7 4.2 9.9 7.0 1.4 0.0 0.0 0.0 1.4 11.3 23.9 16.9 28.2 18.3 0.0 C6-4-6D 112 3.6 13.4 2.7 8.0 8.9 1.8 1.8 0.0 0.0 1.8 11.6 32.1 14.3 19.6 18.8 1.8 C6-4-5D 63 3.2 25.4 11.1 4.8 6.3 3.2 1.6 1.6 0.0 0.0 9.5 17.5 15.9 39.7 14.3 3.2 
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