PRIMARY STUDY ON SEISMIC STRATIGRAPHY OF THE AREA SURROUNDING BOREHOLE NHH01, SOUTH YELLOW SEA
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摘要: 以南黄海中部泥质区采集的高分辨率的反射地震剖面为资料,结合NHH01钻孔的数据,对南黄海中部NHH01钻孔周边地层进行了沉积与构造分析。在剖面可识别的深度范围内划分出10套地震层序,对地层进行了地质年代标定,发现地层旋回与深海氧同位素曲线相比在中更新世以来缺少了十余个旋回,反映了深海氧同位素曲线在陆架区应用的局限性;在剖面上识别了大量的断层,其中大部分断层的构造活动一直持续到中更新世,揭示南黄海最新一期构造活动一直持续到晚更新世之前;通过分析NHH01钻孔周边的构造,对胶黄铁矿的形成环境在构造方面进行了探讨。Abstract: Based on the high-resolution reflection seismic data collected from the mud area surrounding the borehole of NHH01 in the Central South Yellow Sea (SYS) and the core data of the hole, we descried and analyzed the depositional and tectonic environments of the study area. On the profiles there are 10 seismic units recognized with seismic stratigraphy. The geological age of seismic units was determined according to the chronology framework of the Hole NHH01. Comparing with marine isotope stages, more than 10 cycles or units are missing, that indicates the restriction of the application of the marine isotope stages to continental shelve. Some faults are identified on the profiles, and most of them remain active till mid Pleistocene. Therefore, it is inferred that the last tectonic movement may have extended to late Pleistocene. The Hole of NHH01 is located in a tectonic depression formed by the uplifting of neighboring blocks. This tectonic setting might provide the answer to the formation of greigite at the depth of 44.90~51.80 m
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Key words:
- NHH01 /
- seismic stratigraphy /
- middle Pleistocene /
- South Yellow Sea
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