Quick Search:       Advanced Search
Yao Jing,Yu Hongjun,Xu Xingyong,Yi Liang,Chen Guangquan,Su Qiao. 2014. Paleoenvironmental changes during the late Quaternary as inferred from foraminifera assemblages in the Laizhou Bay. Acta Oceanologica Sinica, 33(10):10-18
Paleoenvironmental changes during the late Quaternary as inferred from foraminifera assemblages in the Laizhou Bay
渤海莱州湾地区晚更新世以来有孔虫特征反映的古环境变化
Received:June 05, 2013  Revised:November 27, 2013
DOI:10.1007/s13131-014-0536-0
Key words:foraminifera assemblage  late Quaternary  environmental changes  Laizhou Bay  Bohai Sea
中文关键词:  有孔虫组合  晚第四纪  环境变化  莱州湾  渤海
基金项目:The National Basic Research Program of China (973 Program) under contract No. 2010CB951200; the Marine Public Service Specific Research under contract No. 201105020.
Author NameAffiliationE-mail
Yao Jing Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
University of Chinese Academy of Sciences, Beijing 100049, China 
hjyu@fio.org.cn 
Yu Hongjun Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
Xu Xingyong Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
Yi Liang State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China  
Chen Guangquan Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
Su Qiao Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
Hits: 1185
Download times: 1752
Abstract:
      Controlled by climate changes, there were three large-scale transgressions and regressions around the Bohai Sea during the late Quaternary, which were accepted by most geologists. However, a big controversy still exists about the time when the transgressions occurred separately. In order to find out the process of the paleoenvironmental changes around the Bohai Sea in the late Quaternary, the foraminifera assemblages from a new borehole Lz908 in the southern coast of the Laizhou Bay were studied, and then the transgressive strata were indentified. Combined with accelerator mass spectrometry radiocarbon 14C (AMS14C) and optically stimulated luminescence (OSL) ages, the occurrence time of these transgressions were re-determined. The result showed that three major large-scale transgressions occurred separately at the beginning of marine isotopic stage 7 (MIS7), the last interglacial period (MIS5) and the Holocene. In addition, a small-scale transgression occurred in the mid-MIS6, and the corresponding transgressive stratum was deposited. The transgressive deposition of MIS3 was also discovered in this study. However, the characteristics of the foraminifera indicated the environment during this period was colder than that in the MIS5. By comparison with the global sea-level changes, the paleoenvironmental changes around the Bohai Sea in the late Quaternary can be consistent with the global climate changes.
中文摘要:
      晚第四纪以来,渤海地区存在三次大规模的海侵、海退过程,这一结论得到了大多数学者的认同。然而,关于这三次海侵发生的时间还存在较大的争议。为了搞清晚第四纪以来渤海地区的古环境变化,本文以莱州湾南岸Lz908孔为研究对象,通过研究钻孔的有孔虫组合特征,对海相地层进行了判定。结合钻孔的AMS14C测年和光释光测年(OSL)结果,重建了莱州湾地区晚第四纪以来的环境变化过程,对莱州湾晚第四纪的三次海侵时间重新厘定了年代范围。结果表明,据有孔虫特征判定的三次规模较大的海侵分别发生在氧同位素7期(MIS7),末次间冰期(MIS5)和全新世。另外,在MIS6阶段的中期也存在一次小规模的海侵,沉积了相应的海相地层。LZ908孔在MIS3时期也发现了海侵沉积,但相比较MIS5来说,其有孔虫特征显示这一时期的环境较MIS5时期寒冷。通过与全球海平面变化进行对比,渤海地区晚第四纪的环境变化与全球气候变化是一致的。
HTML View Full Text   View/Add Comment  Download reader
Close