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Geoscience ›› 2020, Vol. 34 ›› Issue (01): 154-165.DOI: 10.19657/j.geoscience.1000-8527.2020.001

• Marine Geology • Previous Articles     Next Articles

Mineral Characteristics, Provenance and Climatic Significance of Wetland Sediments from Dalinghe River Estuary in Liaohe Delta Since Late Pleistocene

GUO Ruoshun1,2,3(), HE Lei1, YE Siyuan1(), ZHAO Lihong3   

  1. 1. Key Laboratory of Coastal Wetlands Biogeosciences, Qingdao Institute of Marine Geology, China Geological Survey, Qingdao,Shandong 266071, China
    2. EGS (Asia) Limited, Hongkong 999077, China
    3. School of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590,China
  • Received:2019-03-03 Revised:2019-10-20 Online:2020-03-05 Published:2020-03-07
  • Contact: YE Siyuan

Abstract:

A total of 58 samples were collected and analyzed for detrital minerals and clay minerals in drillhole ZK3 in the Dalinghe River Estuary. The research reveals that the light minerals account for the majority (average 95.7%) of the sediments, and include mainly plagioclase (43.89%), K-feldspar (28.10%) and quartz (22.45%). Heavy minerals only account for 4.3% of the sediments, and consist mainly of hornblende (38.03%), epidote (27.51%) and authigenic barite (12.01%). Clay minerals comprise mainly illite (50.3%), followed by smectite (24.5%), chlorite (12.7%) and kaolinite (12.6%), constituting an illite-smectite-chlorite-kaolinite assemblage. The sediment provenance of core ZK3 is quite complicated across the geological history. However, except the provenance of the river channel and lacustrine sediments may come from the Dalinghe River, the sediments of other facies were derived mainly from the Liaohe and Daliaohe rivers. Paleoclimatic change, inferred by comprehensive analysis of clay minerals, corresponds well with pollen studies in the Liaohe Delta: in 45~31 ka BP, the smectite/(illite+chlorite) ratios are relatively high, implying a warm and wet climate; in 31~11 ka BP (Lushan inter-glacial stage), the smectite/kaolinite ratios are low, indicating a cold and dry climate during the Dali ice age stage; from 11 ka BP to present (after the end Younger Dryas (YD)), the temperature gradually rises with rising smectite/(illite+chlorite) ratio, which reveals a post-glacial hot and wet climate.

Key words: Dalinghe River, Late Pleistocene, detrital provenance, clay mineral, paleoclimate

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