Journal
QUATERNARY INTERNATIONAL
Volume 447, Issue -, Pages 89-101Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quaint.2017.06.039
Keywords
Stalagmite AMS C-14 dating; delta O-18 and delta C-13; Summer monsoon precipitation; Tiangui Mountain; North China Plain (NCP)
Funding
- Ministry of Science and Technology of Taiwan [MOST 105-2811-M-002-032, 105-2811-M-002-186, MOST 104-2119-M-002-003, 105-2119-M-002-001]
- National Taiwan University [105R7625]
- National Science Foundation of China [41502176]
- Central Public-interest Scientific Institution Basal Research Fun of Chinad [YWF201414]
- China Geological Survey [DD20160305]
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An 11-cm long stalagmite (ZZ12) collected from Zhenzhu cave, Tiangui Mountain, northwest of the North China Plain (NCP) has been measured by Th-230/U, AMS C-14 and Pb-210 dating methods. Only AMS C-14 dating yielded the chronology successfully, while Th-230/U did not due to low uranium content and the young age of the stalagmite. The top layers in the stalagmite contain nuclear bomb carbon signal, and the AMS C-14 dates of charcoal and carbonate samples at the bottom are similar. Based on a series of AMS C-14 dates which contain minimal dead carbon influence (DCI) in the stalagmite, the age model of the stalagmite has been constructed, indicating that the stalagmite was 1970 years old. A total of 470 sub-samples from the upper 51 mm (since 1180 CE) of the stalagmite have been analyzed for delta O-18 and delta C-13. The delta O-18 record of stalagmite ZZ12 reflects changes in the summer monsoonal rainfall in the NCP, being comparable with the local and north-central China dry-wet index. The driest periods were found in 14th-15th centuries in the Little Ice Age (LIA) and since 1970s, perhaps due to weakening of East Asian summer monsoon. The delta C-13. of ZZ12 mainly recorded vegetation changes in Tiangui Mountain and revealed deforestation in two major periods: 1500-1600 CE and 1830-1940 CE caused by local human activities. Spectral analysis of the delta O-18 record suggests that the Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO) may both play important roles in changes of multi-decadal monsoonal rainfall in the NCP, with more rainfall responding to the negative PDO, La Nino-like, and positive AMO phases. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.
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