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全新世以来辽河三角洲地区的化学风化及其对气候变化的响应
郭若舜1, 叶思源2, 何磊2, 赵俐红1
1.山东科技大学 地球科学与工程学院;2.中国地质调查局 滨海湿地生物地质重点实验室
摘要:
以辽河三角洲ZK2孔为研究对象,对其57件样品进行常量元素测试和分析。研究表明该地区总体遭受的化学风化作用较弱,基本处于化学风化的初期阶段,与所处纬度整体化学风化特征类似。将该区全新世以来的气候变化过程分为如下五个阶段:全新世早期(11.0 cal kyr BP-8.8 cal kyr BP):化学风化程度逐渐增强,气候逐步向温湿方向发展;全新世早中期(8.8 cal kyr BP-6.9 cal kyr BP):化学风化程度最强,气候暖湿;全新世中期(6.9 cal kyr BP-4.6 cal kyr BP):风化强度较强,但有减弱的趋势,气候温湿;全新世中晚期(4.6 cal kyr BP-1.3 cal kyr BP):化学风化程度在该时期属于最弱阶段,气候冷干;全新世晚期(1.3 cal kyr BP-至今):气候温干,风化程度有所增强。
关键词:  辽河三角洲  常量元素  风化指数  化学风化  气候变化
DOI:10.11759/hykx20180209002
分类号:P736.2
基金项目:科技部政府间科技创新合作重点专项(2016YFE0109600),国家自然科学基金(41706057)
CHEMICAL WEATHERING AND ITS IMPLICATIONS TO CLIMATE CHANGES IN THE LIAOHE DELTA SINCE HOLOCENE
Guo Ruoshun1, Ye Siyuan2, He Lei2, Zhao Lihong1
1.School of Earth Sciences and Engineering,Shandong University of Science and Technology;2.Key Laboratory of Coastal Wetlands Biogeosciences,China Geological Survey
Abstract:
A total of 57 samples were analyzed for major elements in core ZK2 in the Liaohe Delta. The research reveals that the chemical weathering of the region was weak on the whole and basically in the early stage of chemical weathering, which was similar to the overall chemical weathering characteristics of the latitude. Five stages of the paleoclimate changes were divided since the Holocene in this area, namely: Early Holocene (11.0 cal kyr BP-8.8 cal kyr BP): the intensity of chemical weathering gradually enhanced, and the climate gradually turned into warm-wet conditions; Early and mid-Holocene (8.8 cal kyr BP-6.9 cal kyr BP): the intensity of chemical weathering was the strongest in the Holocene, and the climate was hot and wet; Mid-Holocene (6.9 cal kyr BP-4.6 cal kyr BP): the intensity of chemical weathering was strong, but with a weakening trend, and the climate was warm and wet; Middle and late Holocene (4.6 cal kyr BP-1.3 cal kyr BP): the intensity of chemical weathering was the weakest, and the climate turned cold and dry; Late Holocene (1.3 cal kyr BP-present): the climate was warm and dry with an enhancing intensity of the chemical weathering.
Key words:  Liaohe River Delta  major element  weathering parameters  chemical weathering characteristics  climate change
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