钱塘江下切河谷SE2孔全新世沉积物黏土矿物特征及其意义<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2022.02.023

古地理学报 ›› 2022, Vol. 24 ›› Issue (2): 332-343. doi: 10.7605/gdlxb.2022.02.023

• 岩相古地理学及沉积学 • 上一篇下一篇

钱塘江下切河谷SE2孔全新世沉积物黏土矿物特征及其意义^*

李鑫, 张霞, 林春明, 邓程文, 李绪龙, 冯旭东, 夏长发, 黄舒雅, 赵雪培

内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,江苏南京 210023

收稿日期:2021-08-16 修回日期:2021-12-10 出版日期:2022-04-01 发布日期:2022-04-02
通讯作者: 张霞,女,1985年生,副教授,主要从事沉积学研究。E-mail: zhangxiananjing@163.com。
作者简介:李鑫,女,1998年生,硕士研究生,主要从事第四纪沉积学研究。E-mail: starli@smail.nju.edu.cn。
基金资助:
*国家自然科学基金项目(编号: 13001074)资助

Characteristics and its significance of clay minerals in the Holocene deposits of core SE2 in Qiantang River incised valley

Li Xin, Zhang Xia, Lin Chun-Ming, Deng Cheng-Wen, Li Xu-Long, Feng Xu-Dong, Xia Chang-Fa, Huang Shu-Ya, Zhao Xue-Pei

State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

Received:2021-08-16 Revised:2021-12-10 Online:2022-04-01 Published:2022-04-02
Contact: Zhang Xia,born in 1985,is an associate professor. She is mainly engaged in sedimentology. E-mail: zhangxiananjing@163.com.
About author:Li Xin,born in 1998,is a master degree candidate. She is mainly engaged in Quaternary sedimentology. E-mail: starli@smail.nju.edu.cn.
Supported by:
National Natural Science Foundation of China(No.13001074)

摘要/Abstract

摘要： 通过X射线衍射系统分析了杭州湾地区SE2孔全新世沉积物的黏土矿物组成,结果显示研究层段黏土矿物主要由伊利石、绿泥石、高岭石和蒙脱石组成;伊利石结晶度较好,化学风化指数普遍大于0.5,表明以化学风化为主,且风化趋势自下而上呈递减趋势。通过对比中国东南部主要河流沉积物的黏土矿物组成,认为钱塘江下切河谷全新世沉积物的黏土矿物组成具有较好的物源指示意义: 全新世 Ⅰ 段(即古河口湾和河漫滩)沉积物主要来自钱塘江上游,特征黏土矿物为高岭石,河口外物质贡献不大;Ⅱ 段(即现代河口湾和近岸浅海)沉积物包含较多蒙脱石,表明不仅包括钱塘江上游物质,河口外长江物质也开始进入钱塘江河口。黏土矿物中,高岭石对气候有较好的指示作用:中全新世高岭石含量达到最高值,反映气候最为湿热,化学风化程度最高;晚全新世含量逐渐降低,反映气候逐渐回冷,化学风化强度降低。

关键词: 全新世, 钱塘江, 下切河谷, 黏土矿物, 物源, 气候

Abstract: Characteristics of clay minerals in the Holocene Qiantang River incised-valley fill was systematically analyzed by X-ray diffraction. Results show that clay minerals in the Holocene Qiantang River incised-valley fill mainly consist of illite,chlorite,kaolinite,and smectite;Illite has a good degree of crystallization;Chemical index of illite is generally higher than 0.5,indicating clay minerals had undergone strong chemical weathering and the degree decreased gradually from bottom to top. By comparing the clay mineral composition of main rivers in southeastern China,we suggest that the sediments of section Ⅰ(i.e. the paleo-estuary and fluvial)in the Qiantang River incised valley are mainly derived from the Qiantang River drainage basin characteristic of high amount of kaolinite;whereas the sediments of section Ⅱ(present-day estuary and shallow marine)comprise numerous Changjiang sediments with smectite as diagnostic mineral except the Qiantang River deposits. Additionally,kaolinite could act as a good indicator of climate: kaolinite content reached the highest value in the middle Holocene,indicating a humid and hot climate and the highest chemical weathering degree;in the late Holocene,with the decrease of kaolinite content,the climate gradually became colder with a gradually decreasing chemical weathering degree.

Key words: Holocene, Qiantang River, incised valley, clay mineral, provenance, climate

中图分类号:

P512.2

李鑫, 张霞, 林春明, 邓程文, 李绪龙, 冯旭东, 夏长发, 黄舒雅, 赵雪培. 钱塘江下切河谷SE2孔全新世沉积物黏土矿物特征及其意义^*[J]. 古地理学报, 2022, 24(2): 332-343.

Li Xin, Zhang Xia, Lin Chun-Ming, Deng Cheng-Wen, Li Xu-Long, Feng Xu-Dong, Xia Chang-Fa, Huang Shu-Ya, Zhao Xue-Pei. Characteristics and its significance of clay minerals in the Holocene deposits of core SE2 in Qiantang River incised valley[J]. JOPC, 2022, 24(2): 332-343.

http://www.gdlxb.cn/CN/Y2022/V24/I2/332

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钱塘江下切河谷SE2孔全新世沉积物黏土矿物特征及其意义^*

Characteristics and its significance of clay minerals in the Holocene deposits of core SE2 in Qiantang River incised valley

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钱塘江下切河谷SE2孔全新世沉积物黏土矿物特征及其意义*

Characteristics and its significance of clay minerals in the Holocene deposits of core SE2 in Qiantang River incised valley

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钱塘江下切河谷SE2孔全新世沉积物黏土矿物特征及其意义^*