删除或更新信息,请邮件至freekaoyan#163.com(#换成@)

北部湾北部上更新统的沉积特征及其记录的古环境

本站小编 Free考研考试/2022-01-03

黄向青1,2,,
梁开1,2,,,
夏真1,2,
张顺枝1,2,
林进清1,2,
马胜中1,2,
霍振海2
1. 国土资源部海底矿产资源重点实验室, 广东 广州 510075
2. 广州海洋地质调查局, 广东 广州 510075

基金项目: 中国地质调查局"我国重点海岸带滨海环境地质调查与评价"项目(批准号:1212010611403)资助


详细信息
作者简介: 黄向青, 女, 52岁, 高级工程师, 环境地质学专业, E-mail:eegs2007@163.com
通讯作者: 梁开, E-mail:xyliangkai@163.com
中图分类号: P534.63+1;P722.7

收稿日期:2017-08-11
修回日期:2017-11-29
刊出日期:2018-03-30



The sedimentary characteristics of Upper Pleistocene and its palaeo-environmental records in northern Beibu Gulf

Huang Xiangqing1,2,,
Liang Kai1,2,,,
Xia Zhen1,2,
Zhang Shunzhi1,2,
Lin Jinqing1,2,
Ma Shengzhong1,2,
Huo Zhenhai2
1. Key Laboratory of Marine Mineral Resource, Ministry of Land and Resources, Guangzhou 510075, Guangdong
2. Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou 510075, Guangdong


More Information
Corresponding author: Liang Kai,E-mail:xyliangkai@163.com
MSC: P534.63+1;P722.7

--> Received Date: 11 August 2017
Revised Date: 29 November 2017
Publish Date: 30 March 2018


摘要
晚更新世100 ka以来作为重要气候阶段对后续环境演化影响深远。北部湾位于东亚低纬度季风区,为冷暖气团影响交汇带,是我国最靠近印度洋的大型海湾,沿海地势崎岖,山洪暴发,需要加强对该阶段气候波动及演化研究。在北部湾北部钦州湾口外近浅海钻取了海底岩芯,岩芯直达第四系地层下伏风化壳且进尺为80.05 m,文章对上更新统25.1~9.7 m岩芯段沉积物进行了粒度、微量元素、碎屑矿物、微体古生物测试鉴定以及14C与光释光测年。对数据的研究结果显示,该岩芯段孢粉为热带-亚热带山地植被,所处沉积环境为河流相,沉积要素波动变化并具有阶段性特征,物源来自周边陆区风化侵蚀。划分出4个岩芯深度段及相应的4个气候阶段,并对测年数据应用线性插值方法得到气候阶段为:末次间冰期(103~60 ka)水动力低能-高能环境、末次冰期早冰阶(60~46 ka)低能环境、末次冰期间冰阶(46~19 ka)低能-高能环境、末次冰期晚冰阶(19~11.4 ka)低能环境,均与相邻云贵高原和中国长江以南地区同期区域气候具有可比性。除此之外,还辨识出67 ka前后出现了一次暖事件,具有颗粒变细,有机质、微量元素、黄铁矿和褐铁矿等含量出现异常峰值并且相对增幅极高的特征,表明环境湿热和微生物还原活跃等。该暖事件在时间上与Dansgaard-Oeschger旋回(D-O旋回)序号19暖事件最为接近,序号18暖事件则次之,说明在我国季风区的湖北三宝洞、重庆新崖洞、南京葫芦洞石笋研究已发现的对应D-O旋回暖事件序号20~18时期,再往西南沿岸同样发生了与D-O旋回可对应的暖事件。
北部湾北部/
上更新统/
沉积特征/
古环境/
暖事件

Under the tropical and sub-tropical climatic background, northern Beibu Gulf is an interaction zone between cold and warm air masses and is the gulf closest to Indian Ocean in China resulting frequent climatic fluctuations. By comparison with neighboring areas especially northern areas' rich data and research results, the study on palaeo-climatic fluctuations since Late Pleistocene in northern Beibu Gulf and their characteristics have almost not carried out yet. The seismic profile interpretation and geological core sediments analysis have revealed that there were buried river channels during Quaternary under seafloor outside Qinzhou Bay Mouth, which formed during sea transgression in Holocene and had become the transition zone from submarine slope to submarine plain. There are main run offs now Fangcheng River, Maoling River, Qin River, Dafeng River and Nanliu River from west to east along coastline of Qinzhou Bay and its neighboring areas.
This study obtained whole-length 80.05 m core sediments(core ZK9)from Quaternary strata to the upper surface of weathered crust through drill equipment in position of 21°24'20″N, 108°33'57″E located at northern part of a sunken area outside the Qinzhou Bay Mouth by seismic interpretation. Based on 1 m interval, 13 sediments samples of Upper Pleistocene from 25.1 m to 9.7 m(103~11.5 ka)and 4 samples for age dating were analyzed and identified in laboratories in fundamental sedimentology of granularity, micro-geochemical elements, detrital minerals and micro-palaeontology and age measurement. The age dating results were 103±10 ka(25.1 m), 66±7 ka(20.8 m), 62±6 ka(20.2 m)by optical stimulated luminescence method(OSL)and 11598±51 cal.a B.P.(10.2 m)by 14C method respectively and the age frame was then established through linear interpolation.
The study results showed that there were tropical and sub-tropical sporopollen species of Microlepia, Polypodiaceae, Castanopsis and so in this Upper Pleistocene core sediments, the dominant diatom species was Cyclotella striata and there wasn't any foraminifera found. The sediments composition was sand, silt and clay with pebbles in some depths, and the detrital minerals included quartz, feldspar, pyrite, ilmenite, limonite and so on with dominant quartz averaged 89.02% in concentration. The concentration of micro-geochemical elements ranged from 9.64~246.86 μg/g within which Ba reached the highest, and there were significant correlation between Co, Ni, Sr, Zn, Zr, Ga, Ba beside Cu and Cr which were more sensitive to oxidation-reduction condition. The study also revealed that the sedimentary environment was of fluvial/riverine facie with the characteristics of time or depth fluctuations and then divided into two primary stages:the Last Interglacial and the Last Glacial and further four climatic stages periodically. The Stage One 103~60 ka(25.1~19.6 m)was the Last Interglacial with fluvial facie and warm event, and Stage Two was divide into three sub-stages:Sub-stage One 60~46 ka(19.6~17.1 m)Early Ice Order with generally-low(hydrodynamic)energy, 46~19 ka(17.1~11.5 m)Interglacial Order with generally-high energy and 19~11.5 ka(11.5~9.7 m)Late Ice Order with generally-low energy. The above four climatic stages could be basically corresponded to palaeo-climates of same times in neighboring regions of Yun-Gui Plateau and South of Changjiang River. During above Interglacial Order of the Last Glacial(17.1~11.5 m), semi-saline diatom species Cyclotella striata appeared in some depths indicating that the river systems possibly had ever connected into northern continent shelf of South China Sea. There were possibly a millennial-scale warm event in 20.9 m depth(age 67 ka under age frame and a little more earlier than 20.8 m of laboratory dating result 66 ka)with sediments granularity parameters mean grain size Mz 4.29 φ, sorting σI 4.68 φ, skewness SkI almost 0 and kurtosis KG 1.58, concentration of pyrite 12.8025%, concentration of micro-geochemical elements 14.2~650 μg/g, Σ(micro-geochemical elements)1342.4 μg/g as well as organic matter 3.72%, all of which reached their maximum of this whole Upper Pleistoncene core sediments except Cu and Cr.
There were also sharp growth percentages in silt composition 119.46% and granularity parameters -94.70%~43.78%, and limonite and pyrite exceeding 1000%, micro-geochemical elements 374.72% in maximum, and organic matter 853.85% except Cr indicating humid and warm climatic background, strong weathering and leaching and also significant chemical reduction condition. By making concentration comparison with ZK4 and ZK5 sediments core of the Pleistocene strata in neighboring area respectively:the concentration of above warm event was 10429.8 times of ZK5 in pyrite(pyrite concentration is 0 in ZK4 and limonite is 0 in both ZK4 and ZK5), over 1.0 and maximum 28.8 and 17.6 except Cu and Cr in micro-geochemical elements, Σ(micro-geochemical elements)was both 2.8, organic matter 16.5 and 18.9 respectively. This event might be an example of frequent fluctuation thereafter globally 72 ka Cold Event and corresponded in age to Dansgaard-Oeschger Warm Events(D-O fluctuation)labeled 19 in GISP 2 ice core meaning that the occurring extent of D-O fluctuation had extended to further southwestern part in monsoon region of China by comparison with D-O labeled 20~18 of stalagmite records found in Hulu cave in Nanjing, Sanbao cave in Hubei and Xinya cave in Chongqing. As a climatically sensitive zone and geologically sunken developed areas, the relationship of northern Beibu Gulf with global climatic change needs much more attention.
northern Beibu Gulf/
Upper Pleistocene/
sedimentary characteristics/
palaeo-environment/
warm event



PDF全文下载地址:

http://www.dsjyj.com.cn/data/article/export-pdf?id=dsjyj_11465
相关话题/环境 广州 数据 广东 动力

  • 领限时大额优惠券,享本站正版考研考试资料!
    大额优惠券
    优惠券领取后72小时内有效,10万种最新考研考试考证类电子打印资料任你选。涵盖全国500余所院校考研专业课、200多种职业资格考试、1100多种经典教材,产品类型包含电子书、题库、全套资料以及视频,无论您是考研复习、考证刷题,还是考前冲刺等,不同类型的产品可满足您学习上的不同需求。 ...
    本站小编 Free壹佰分学习网 2022-09-19
  • 广东大鹏半岛“仙人石”的成因
    王为1,,黄日辉1,21.华南师范大学地理科学学院,广东广州5106312.岭南师范学院物理科学与技术学院,广东湛江524048基金项目:国家自然科学基金项目(批准号:41571002)资助详细信息作者简介:王为,男,61岁,教授,第四纪地质与地貌专业,E-mail:wangw@scnu.edu.c ...
    本站小编 Free考研考试 2022-01-03
  • 基于Delft 3D模拟海南清澜潮汐汊道动力对人类活动的响应
    王发云1,,邱立国1,梁小力1,莫文渊2,,,梁乃安1,王艺臻31.海南省海洋与渔业科学院,海南海口5711262.海南大学,海南海口5702283.海南师范大学,海南海口571158基金项目:海南省自然科学基金项目"八门湾泻湖和清澜港汊道的潮汐动力学机制研究"(批准号:20154175)资助详细信 ...
    本站小编 Free考研考试 2022-01-03
  • 江苏南通黄泥山黄土漫反射光谱特征及古环境意义
    张伊琳1,,董艳1,吴超2,钱鹏1,,,郑祥民21.南通大学地理科学学院,江苏南通2260072.华东师范大学地理科学学院,上海200241基金项目:国家自然科学基金项目(批准号:41601189和41671003)、江苏省大学生创新创业训练计划重点项目(批准号:201510304049Z)和南通市 ...
    本站小编 Free考研考试 2022-01-03
  • 青藏高原东北缘尖扎盆地碳酸盐含量及其古环境意义
    席建建1,,符超峰1,2,,,孟媛媛1,王祎11.长安大学,地球科学与资源学院,陕西西安7100542.中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,陕西西安710061基金项目:国家自然科学基金项目(批准号:41772167和41140028)资助详细信息作者简介:席建建,男,25岁, ...
    本站小编 Free考研考试 2022-01-03
  • GDGTs揭示的西宁盆地中中新世环境变化
    郭海超1,2,3,,陈炽皓1,2,3,白艳1,2,,,方小敏1,2,3,张伟林1,21.中国科学院青藏高原地球科学卓越创新中心,北京1001012.中国科学院青藏高原研究所,大陆碰撞与高原隆升重点实验室,北京1001013.中国科学院大学,北京100049基金项目:国家自然科学基金面上项目(批准号: ...
    本站小编 Free考研考试 2022-01-03
  • 长三角溧阳震区地应力环境及构造稳定性分析
    摘要/Abstract摘要:溧阳震区地处长三角腹地,因短期内连续发生两次中强震而被广泛关注,其构造稳定性对长三角地区影响重大.目前溧阳震区地应力环境尚缺少实测数据,对震区内主要断裂在现今地应力环境下的稳定性认识不清.为此在溧阳震区开展深孔水压致裂地应力测量工作,查明震区现今地应力环境,结果显示:最大 ...
    本站小编 Free考研考试 2022-01-02
  • 噪声环境下宽频带与短周期地震仪观测资料对比分析
    摘要/Abstract摘要:短周期密集台阵观测是目前开展深浅部地球物理探测的一种低成本、高环保、高效率的地震学手段,目前处于蓬勃发展的重要阶段.为了对短周期地震仪的观测资料有一个全面认识,本文选择接近野外噪声的观测环境,对短周期和宽频带地震记录仪的观测资料进行了系统时频分析和对比.结果表明:短周期地 ...
    本站小编 Free考研考试 2022-01-02
  • 基于机器学习的大地电磁时域数据处理的研究现状
    摘要/Abstract摘要:大地电磁测深法基于天然电磁场,其存在信号弱频带宽的特点,因此很难获得无噪声的数据,而传统的大地电磁数据处理方法面临着噪声环境日益复杂、对于海量数据的处理效率不高和难以剔除持续性噪声等诸多挑战.机器学习方法是一种基于统计分析的数据驱动方法,能够发现数据内部的结构和规律,从而 ...
    本站小编 Free考研考试 2022-01-02
  • 基于反射地震数据的时频域包络反演
    摘要/Abstract摘要:包络信号含有丰富的低频分量,即使在地震数据缺失低频条件下,包络目标函数也能有效缓解全波形反演的周期跳跃现象.但是,当初始速度模型较为平滑时,观测数据中的反射地震事件在模拟数据中没有与之相对应的波形,导致包络反演初期无法很好地利用反射波信号进行速度建模.本文提出基于反射地震 ...
    本站小编 Free考研考试 2022-01-02
  • 瞬变电磁数据交叉型组合域去噪技术研究与应用
    摘要/Abstract摘要:高效的瞬变电磁数据处理对后续的精确地质解译具有决定性的作用,而数据信号的去噪是数据处理环节的重中之重.时频分析方法是当前广泛应用于瞬变电磁数据处理去噪领域的主要方法技术,但其基本是单域方法的应用探索,各自单域方法实际应用效果不尽人意.本文基于曲波变换、小波变换及高阶相关统 ...
    本站小编 Free考研考试 2022-01-02