| Institute of Geomechanics, Chinese Academy of Geological Sciences | Host |
| Citation: |
Ruijie LI, Yong ZHAO, Bo WEI, Yonghua SUN, Qiang WANG. STRATIGRAPHIC GEOCHRONOLOGY OF ACX02 BOREHOLE IN THE MIDDLE AND LOWER REGION OF THE YONGDING RIVER, THE NORTH OF THE LANGGU DEPRESSION[J]. Journal of Geomechanics, 2019, 25(2): 249-256. doi: 10.12090/j.issn.1006-6616.2019.25.02.024
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STRATIGRAPHIC GEOCHRONOLOGY OF ACX02 BOREHOLE IN THE MIDDLE AND LOWER REGION OF THE YONGDING RIVER, THE NORTH OF THE LANGGU DEPRESSION
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Abstract
The establishment of quaternary stratigraphic chronology framework is of great significance to the study of regional stratigraphic correlation and paleogeographic environment evolution. The structural construction and lithological composition characteristics of the 378m core sediments of the ACX02 borehole in Houwanggezhuang village in the north of the Langgu depression in the middle and lower reaches of Yongding river were analyzed. Using methods of well logging, paleomagnetism, AMS14C and OSL dating, detailed stratigraphic division, study of sedimentary facies, and establishment of stratigraphic chronology framework were carried out for ACX02 borehole profile. The results show that:the core records the sub-time of positive polarity of bujong, jaramillo, ordovi and gauss; The strata from old to new are:the lower pleistocene (Qp1) is dominated by fluvial and flood plain facies with a bottom boundary of 260 m; the middle pleistocene (Qp2) is dominated by limnetic sedimentary with a bottom boundary of 76.7 m; the upper pleistocene (Qp3) is dominated by fluvial facies with a bottom boundary of 59.7 m; the holocene (Qh) is dominated by flood plain facies with a bottom boundary of 15.45 m. -
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Ruijie LI, Yong ZHAO, Bo WEI, Yonghua SUN, Qiang WANG. STRATIGRAPHIC GEOCHRONOLOGY OF ACX02 BOREHOLE IN THE MIDDLE AND LOWER REGION OF THE YONGDING RIVER, THE NORTH OF THE LANGGU DEPRESSION[J]. Journal of Geomechanics, 2019, 25(2): 249-256. doi: 10.12090/j.issn.1006-6616.2019.25.02.024
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- Figure 1. Schematic map of tectonic and the location of the ACX02 borehole
- Figure 2. The lithological column, natural gama and step resistivety logging curves as well as sedimentary environment interpretation in the borehole ACX02
- Figure 3. Orthogonal(Zijderveld) vector plots of representative specimens from the ACX02 borehole
- Figure 4. magnetostratigraphy of ACX02 borehole