Multiproxy studies of lake sediments during mid-Holocene in Zhengzhou region of the Henan Province, central China, and the implications for reconstructing the paleoenvironments
Multiproxy studies of lake sediments during mid-Holocene in Zhengzhou region of the Henan Province, central China, and the implications for reconstructing the paleoenvironments
复制标题
河南省郑州地区全新世中期湖泊沉积的多代理研究及其对古环境重建的意义
DOI：
10.1016/j.quaint.2019.06.039
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发表时间：
2019-06-30
影响因子：
2.2
通讯作者：
Liu, Xianbin
中科院分区：
文献类型：
--
作者：
Wang, Longsheng;Hu, Shouyun;Liu, Xianbin
郑州地区是中华文明的重要发祥地，其全新世环境演变引起了广泛的关注。本文对河南郑州地区PT沉积物的粒度、总有机碳（TOC）、地球化学、孢粉和磁性矿物进行了系统的研究。沉积相单元由下至上依次为冲积存款、湖泊存款、沼泽存款、湖泊存款和冲积存款。磁性测量表明，磁铁矿和赤铁矿占主导地位的磁性矿物组合。根据AMS C-14测年，郑州地区的湖相和沼泽相沉积（1380-640 cm）的年代为5580-2670年BP，并与邻近岩心的地层对比进一步证实了年代学。从孢粉学上看，5580 ~ 5210年BP，蒿属、藜科、禾本科和莎草科花粉含量最低，粘土含量、Sr含量、Fe/Mn比值和磁性矿物含量较高，香蒲属、狐尾藻属、蒿属和莎草科花粉含量迅速增加，ARM/SIRM和ARM/chi值逐渐增大，chi、ARM和SIRM值急剧下降，粘粒含量、Sr含量和Fe/Mn比值较高。4670 ~ 2670 yr BP，禾本科、蒿属、香蒲属和狐尾藻属的花粉百分比逐渐降低，chi、ARM和SIRM值呈上升趋势，ARM/chi和ARM/SIRM值呈下降趋势。追溯郑州地区中全新世以来的环境变迁，可以为研究这一中华文明发祥地的人类社会发展提供环境参考。
The Holocene environmental evolution of the Zhengzhou region that is a major birthplace of Chinese civilization is of great interest to a wide community. In this study, we conducted a systematic investigation on grain size, total organic carbon (TOC), geochemistry, pollen and magnetic minerals of core PT sediments from the Zhengzhou region of the Henan Province in central China. Five units of sedimentary facies are identified as alluvial deposit, lacustrine deposit, swamp deposit, lacustrine deposit and alluvial deposit from bottom to top. Magnetic measurements indicate that magnetite and hematite dominate the magnetic mineral assemblages. The lacustrine and swamp deposits (1380-640 cm) were AMS C-14 dated to 5580-2670 yr BP and the chronology is further corroborated by the pedostratigraphic correlation to the adjacent cores in Zhengzhou region. Palynologically speaking, the period from 5580 to 5210 yr BP was characterized by lowest pollen percentages of Artemisia, Chenopodiaceae, Gramineae and Cyperaceae, higher values in clay contents, Sr contents and Fe/Mn ratios and also contents of magnetic mineral. The period from 5210 to 4760 yr BP was typified by rapid increases in Typha, Myriophyllum, Artemisia and Cyperaceae pollen percentages, gradual increases in ARM/SIRM and ARM/chi values, drastic drops in chi, ARM and SIRM values, with rather high values in clay contents, Sr contents and Fe/Mn ratios. The period between 4670 and 2670 yr BP was featured by gradual decreases in Gramineae, Artemisia, Typha and Myriophyllum pollen percentages, and increasing trends of chi, ARM and SIRM values, and decreasing trends of ARM/chi and ARM/SIRM values. Tracing the environmental changes since the mid-Holocene in the Zhengzhou region can provide an environmental reference for studying the human societal development in this birthplace of Chinese civilization.