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Core characteristics and Quaternary stratigraphic division of borehole QK4 in southern Lubei Plain |
ZHOU Yong-Gang1,2( ), DAI Li-Ming3,4, TIAN Zhen-Huan1,2, YU Chun-Nan1,2, ZHANG Zhen-Fei1,2,5, LIU Wei1,2, PEI Lun-Pei1,2 |
1. No.1 Institute of Geology and Mineral Resources of Shandong Province, Jinan 250109, China 2. Shandong Engineering Laboratory for High-Grade Iron Ore Exploration and Exploitation, Jinan 250109, China 3. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China 4. Functional Laboratory of Marine Mineral Resources Evaluation and Exploration Technology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China 5. Kunming University of Science and Technology, Kunming 650093, China |
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Abstract The establishment of the Quaternary stratigraphic framework is of great significance for the study of regional stratigraphic correlation and paleogeographic environment evolution. The sedimentary strata since the Late Pleistocene have been extensively studied, but the research on the complete Quaternary stratigraphic framework is not yet sufficient. Therefore, paleomagnetic, AMS 14C, OSL, well logging, and lithostratigraphic studies were conducted on borehole QK4 (depth: 285.98 m) in the Lubei Plain. Based on the systematic paleomagnetic sampling (398 samples), processing, and testing, it is considered that the cores from borehole QK4 recorded Brunhes normal polarity chron, Maruyama reversed polarity chron, Gauss normal polarity chron, and some of their polarity subchrons. Based on the magnetic age framework, as well as MS 14C, OSL, well logging, and lithostratigraphic characteristics, the Quaternary strata revealed by borehole QK4 were divided, and it was determined that the bottom boundaries of the Holocene, Upper Pleistocene, Middle Pleistocene, and Lower Pleistocene strata have depths of 4.11 m, 23.49 m, 118.70 m, and 147.35 m, respectively. Moreover, as the strata revealed, the strata revealed by borehole QK4 include the Cenozoic Heituhu, Dazhan, Pingyuan, and Minghuazhen formations from top to bottom. The results allowed for the establishment of the Quaternary stratigraphic framework in the southern Lubei Plain, thus providing reliable petrological, chronological, and paleomagnetic evidence for the Quaternary stratigraphic division and correlation and palaeogeographic environmental evolution in the southern Lubei Plain.
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Received: 22 January 2022
Published: 24 February 2023
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Structural map of Lubei Plain(modified from reference[14??-17])
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序号 | 样品号 | 埋深/m | 岩性 | 分析结果 | 备注 | 现代碳百分数/% | 表观年龄/ka | 1 | QK4-Z1 | 0.7~1.0 | 极深灰色含有机质粘土 | 44.11±2.45 | 6.77±0.46 | |
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AMS 14C dating result of Borehole QK4
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序号 | 样品号 | 埋深/m | U/ppm | Th/ppm | K/% | 等效剂量 E.D(Gy) | 含水量 /% | 年龄/ka | 备注 | 1 | QK4-GS1 | 1.5~1.8 | 2.83±0.10 | 12.0±0.31 | 1.73±0.06 | 18.34±0.79 | 15.1 | 4.8±0.3 | | 2 | QK4-GS2 | 14.05~14.25 | 2.06±0.08 | 9.41±0.27 | 1.75±0.06 | 239.80±3.50 | 16.8 | 75.2±3.4 | | 3 | QK4-GS11 | 203~203.2 | 2.08±0.09 | 10.2±0.29 | 1.86±0.06 | 560.02±12.41 | 16.6 | >169.0 | 生长曲线 趋于饱和 |
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OSL dating results of Borehole QK4
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Lithological column, natural gamma, resistivity, density, natural potential and sedimentary environment analysis of borehole QK4
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序号 | 深度/m | 实测极性层 | 标准极性带 | 极性亚时 | 年代/Ma | 1 | 0~23.49 | N1 | Brunhes | | | 2 | 23.49~26.44 | R1 | Blake | 0.12 | 3 | 26.44~28.40 | N2 | | | 4 | 28.40~29.58 | R2 | Cr0 | 0.260 | 5 | 29.58~32.10 | N3 | | | 6 | 32.10~33.75 | R3 | Cr1 | 0.319 | 7 | 33.75~65.18 | N4 | | | 8 | 65.18~66.88 | R4 | Cr2 | 0.543 | 9 | 66.88~72.96 | N5 | | | 10 | 72.96~75.08 | R5 | Cr3 | 0.593 | 11 | 75.08~116.59 | N6 | | 0.781 | 12 | 116.59~120.43 | R6 | Matuyama | | | 13 | 120.43~123.42 | N7 | | | 14 | 123.42~129.31 | R7 | | | 15 | 129.31~134.17 | N8 | Olduvai | 1.77~1.95 | 16 | 134.17~141.54 | R8 | | | 17 | 141.54~144.69 | N9 | | | 18 | 144.69~147.39 | R9 | | 2.588 | 19 | 147.39~171.25 | N10 | Gauss | | | 20 | 171.25~173.77 | R10 | Kaena | 3.032~3.116 | 21 | 171.25~217.54 | N11 | | | 22 | 217.54~221.57 | R11 | Mammoth | 3.207~3.330 | 23 | 221.57~285.98 | N12 | | |
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Comparison of paleomagnetism analysis results of Borehole QK4
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Magnetostratigraphy of borehole QK4
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Characteristics of borehole core and field profile
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