陈禹飞^1,2,,
乔淑卿^2,3,,,
石学法^2,3,
葛晨东¹,
李秋玲²,
刘升发^2,3,
张颖²,
王小静²,
SomkiatKhokiattiwong⁴,
NarumolKornkanitnan⁵
1. 南京大学海岸与海岛开发教育部重点实验室, 江苏 南京 210023
2. 自然资源部第一海洋研究所, 海洋地质与成矿作用重点实验室, 山东 青岛 266061
3. 青岛海洋科学与技术试点国家实验室, 海洋地质过程与环境功能实验室, 山东 青岛 266237
4. 泰国普吉 海洋生物中心, 普吉 83000
5. 泰国海洋和海岸资源研究中心, 曼谷 74000

基金项目: 国家自然科学基金委员会-山东省人民政府海洋科学研究中心联合基金项目(批准号：U1606401)和自然资源部"全球变化与海气相互作用"专项项目(批准号：GASI-GEOGE-03和GASI-02-SCS-CJ03)共同资助


详细信息

作者简介: 陈禹飞, 男, 24岁, 硕士研究生, 海洋地质专业, E-mail:geocyf@163.com

通讯作者: 乔淑卿, E-mail:qiaoshuqing@fio.org.cn

中图分类号: P722.7;P595

收稿日期:2019-12-28
修回日期:2020-03-22
刊出日期:2020-05-25

Geochemical evidence for the sediment provenance evolution in the Gulf of Thailand since the last deglacial

Chen Yufei^1,2,,
Qiao Shuqing^2,3,,,
Shi Xuefa^2,3,
Ge Chendong¹,
Li Qiuling²,
Liu Shengfa^2,3,
Zhang Ying²,
Wang Xiaojing²,
Somkiat Khokiattiwong⁴,
Narumol Kornkanitnan⁵
1. Key Laboratory of Coast and Island Development, Ministry of Education, Nanjing University, Nanjing 210023, Jiangsu
2. Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, Shandong
3. Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, Shandong
4. Phuket Marine Biological Center, Phuket 83000, Thailand
5. Department of Marine and Coastal Resources, Marine and Coastal Resources Research Center, Bangkok 74000, Thailand


More Information

Corresponding author: Qiao Shuqing,E-mail:qiaoshuqing@fio.org.cn

MSC: P722.7;P595

--> Received Date: 28 December 2019
Revised Date: 22 March 2020
Publish Date: 25 May 2020


摘要
摘要:本文对泰国湾西部T93柱状沉积物样品进行了常微量元素测试，探讨了沉积物物源和沉积环境变迁。T93柱状样全长381 cm，底层年代约14640 cal.a B. P.，间隔10 cm取样测试，样品平均年代间隔375 a。测试结果表明，末次冰消期以来泰国湾沉积物来源主要经历了4个阶段的变迁：1)14640~ 11700 cal.a B. P.期间，该阶段为低海平面时期的陆相沉积，沉积物为粘土质粉砂，Na、K、Ca等活跃的碱金属和碱土金属元素含量较低，Ti、Zr、Ba等含量高，表现出强烈的化学风化特征；δEu平均为0.60，(La/Yb)_PAAS平均0.92，物质来源以马来半岛为主，但分异程度高，成分较复杂。2)11700~8000 cal.a B. P.期间，该阶段为海平面快速上升期的滨海沉积，沉积物主要为粘土质粉砂，粉砂组分含量开始增加，Mg和Mn元素含量大幅升高，Fe、Ti含量减少；δEu平均为0.58，(La/Yb)_PAAS平均0.99，物质来源主要为马来半岛。3)8000~4000 cal.a B. P.期间，该阶段为高海平面时期的陆架沉积，沉积物包括粉砂和粘土质粉砂，Mg、Na、Ca含量明显增大，化学风化程度减弱；δEu平均为0.60，(La/Yb)_PAAS平均1.08，沉积物主要来自中南半岛。4)4000 cal.a B. P.至今，该阶段为海平面稍有下降的稳定陆架沉积，沉积物主要为粉砂，沉积物元素总体稳定，现代沉积体系基本形成；δEu平均为0.62，(La/Yb)_PAAS平均0.97，沉积物以马来半岛物质为主，中南半岛物质为辅，物源与现代一致。
关键词: 末次冰消期/
沉积物/
物源/
常微量元素/
稀土元素/
泰国湾

Abstract:A 381-centimeter long gravity core T93 located at 9.9261°N, 100.6442°E was collected from the western Gulf of Thailand(5°~13°30'N, 99°~106°E) by SEAFDEC in May 2012, with a sampling water depth of 59 m. A total of 38 samples were collected at intervals of 10 cm, and the bottom age is about 14640 a B.P., so the sampling interval is about 375 a. Major and trace element content of < 0.1 mm part of the samples were measured, and the evolution of sediments provenance and sedimentary environment since the Last Deglacial is discussed on the basis of AMS ¹⁴C dating, grain-size, color reflectance and element content data. The results show that the process of sedimentation can be divided into four stages: (1)From 14640 cal.a B. P. to 11700 cal.a B. P., the sea level is basically low and the sediments composed of clayey silt is deposited in a terrestrial environment. The content of alkaline elements such as Na, K, Ca and Mg is extremely low, while the content of Fe, Ti and Ba is high, showing a strong chemical weathering intensity. The average δEu is 0.60 and(La/Yb)_PAAS is 0.92, respectively, indicating that the sediments are mainly from the Malay Peninsula and partly the Indo-China Peninsula and the South China Sea. (2)From 11700 cal.a B. P. to 8000 cal.a B. P., the sea level rises rapidly and the western Gulf of Thailand is in a coastal environment. The content of silt and active elements show a slight increase. By contrast, the content of Fe, Ti, and Ba decrease. The average δEu is 0.58 and(La/Yb)_PAAS is 0.99, indicating the sediments are mainly from the Malay Peninsula. (3)From 8000 cal.a B. P. to 4000 cal.a B. P., the sea level reaches the maximum. The western Gulf of Thailand become a shelf environment and the sediments consist of silt and clayey silt. The content of Na increases by 50% while the other elements change little, and the chemical weathering intensity becomes weaker. The average δEu and(La/Yb)_PAAS value is 0.60 and 1.08 respectively, indicating that the sediments mainly derive from the Indo-China Peninsula. (4)The last 4000 years, the elemental and grain-size composition of the sediments remain steady as the sea level slightly decreases. The average δEu is 0.62 and(La/Yb)_PAAS is 0.97, hence the sediments are mainly influenced by material from the Malay Peninsula, and partly affected by sediments from the Indo-China Peninsula.
Key words:Last Deglacial/
sediment/
provenance/
major and trace element/
rare earth element/
Gulf of Thailand



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