巽他海峡BAR9442岩心30 kaBP以来的沉积记录与古季风活动

赵悦; 丁旋

doi:10.3799/dqkx.2011.063

巽他海峡BAR9442岩心30 kaBP以来的沉积记录与古季风活动

doi: 10.3799/dqkx.2011.063

赵悦^{1, 2, 3},
丁旋¹

1.
中国地质大学海洋学院，北京 100083
2.
中国地质科学院矿产资源研究所，北京 100037
3.
国土资源部成矿作用与资源评价重点实验室，北京 100037

基金项目:

国家自然科学基金项目 40676034

详细信息

作者简介:
赵悦(1986-)，女，硕士研究生，海洋地质专业，研究方向为晚第四纪西太平洋－东北印度洋高分辨率的古气候与古海洋学

中图分类号: P736.22
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出版历程
- 收稿日期: 2010-11-12
- 刊出日期: 2011-07-01

Sedimentary Record and Monsoon Activity of Core BAR9442 in Sunda Strait during 30 kaBP

ZHAO Yue^{1, 2, 3},
DING Xuan¹

1.
Marine School, China University of Geosciences, Beijing 100083, China
2.
Institute of Mineral Resources, CAGS, Beijing 100037, China
3.
Key Laboratory of Metallogeny and Mineral Assessment, MLR, Beijing 100037, China

摘要

摘要: 为重建巽他海峡区古季风活动历史，通过对BAR9442岩心氧同位素、AMS¹⁴C测年、陆源碎屑标准偏差区间粒径分布，以及上升流种Globigerina bulloides等变化特点分析，并结合前人对该岩心粘土矿物的研究，获得如下认识：末次冰期30~17 kaBP，海平面下降，陆源粉砂物质输入增加; 南半球夏季日照率高，然而受冰期热带辐聚带位置影响，西北季风受阻，东南信风持续吹过研究海域形成类似东南季风的效应，气候冷干; 受印度东北季风影响，伊利石含量最高，上升流活动不发育, 古生产力降低.17~8 kaBP，海平面迅速上升，出现较强的表层穿越流活动，粘土物质成为沉积物的主要组分; 此时东南与西北季风都有增强，说明当时研究区气候有着更强的季节性.全新世8 kaBP以来，全球海平面上升使穿越流活动加强，沉积物粘土组分含量最大，西北季风带来温暖湿润的气候条件.
- 南爪哇流 /
- 粒度分析 /
- 粘土矿物 /
- 古季风 /
- 穿越流 /
- 末次冰期
Abstract: Core BAR9442 (6°04.56′S and 102°25.08′E; 2 542 m water depth) is obtained below the present South Java Current, offshore the southern portion of Sumatra in the eastern Indian Ocean. Based on analyses of δ¹⁸O, AMS¹⁴C ages, grain-size distribution of standard deviation stages and relative abundance of Globigerina bulloides which commonly encountered in upwelling areas, as well as the record of clay mineral in Gingele et al.(2002), we come to the following conclusion: during the last glacial period 30-17 kaBP, when sea level was lower, terrigenous sands supply increased. Even the austral summer insulations strengthened, though the southward shift of the ITCZ in the austral summer may have been considerably restricted, where the northwest monsoon did not operate, and this would create a situation analogous to the southeast monsoon operating throughout the year, because the trade winds would blow continually across the study area. The climate was cold and dry. Under the influence of Indian northeastern monsoon, the percentage content of illite was the highest, and upwelling activity was absent and induced a low productivity. Rapid rise of sea level at the deglaciation 17-8 kaBP, the shallow connections re-opened, Makassar Strait and Lombok Strait were wider, leading to intensified surface ITF, and clay mineral became the dominated terrigenous material. The SE monsoon and NW monsoon seem to be strengthened in Early Holocene, indicating that the biannual monsoonal system was mostly intense at this time. During the Holocene (about 8 kaBP), with the sea level rising, the throughflow enhanced, and the clay minerals of the terrigenous sediments have a maximum influx while intensified NW monsoon generated a warm and wet climate.
- South Java Current /
- grain size analysis /
- clay minerals /
- paleomonsoon /
- throughflow /
- Last Glacial

HTML全文

图 1 现代印尼海区8月表层洋流活动示意和BAR9442岩心位置(Gingele et al., 2002; Lückge et al., 2009)

Fig. 1. Surface currents of the Indonesian archipelago in August and location of core BAR9442

1.Core BAR9432; 2.Core BAR9403; 3.Core S0139-74kL

下载: 全尺寸图片幻灯片

图 2 BAR9442站位陆源碎屑粒度分析的标准偏差分布曲线

Fig. 2. Standard deviation of grain size analysis of site BAR9442

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图 3 BAR9442站G.ruber氧、碳同位素，粒度标准偏差区间、中值粒径、G.bulloides百分含量(丁旋数据未发表)、沉积速率、全球相对海平面高度曲线(Chappell et al., 1996)及30°N 6月(粗)和30°S 12月(细)日照率曲线

Fig. 3. Down-core variations of the oxygen and carbon isotopes of G.ruber, grain size distribution of standard deviation stages, percentage of middle grain size, sedimentation rate, global relative sea level (Chappell et al., 1996), relative abundance of G.bulloides of core BAR9442 and the insolation of 30°N Jun. (thick) and 30°S Dec.(thin)

下载: 全尺寸图片幻灯片

图 4 印度尼西亚及西北澳大利亚地区高岭石、蒙脱石、伊利石、绿泥石分布(Gingele et al., 2001)

Fig. 4. Distribution of kaolinite, smectite, illite, chlorite between Indonesia and NW Australia

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图 5 粘土矿物百分含量分布(Gingele et al., 2002)

Fig. 5. Down-core variations of the clay mineral percentages of core BAR9442

下载: 全尺寸图片幻灯片

表 1 BAR9442岩心AMS¹⁴C测试结果

Table 1. AMS¹⁴C ages and the calibrated calendar ages of core BAR9442

深度(cm)	AMS¹⁴C年龄(aBP)	校正后的日历年龄(cal.aBP)
19.5	2 800±40	2 891±49
30.5	3 475±30	3 737±52
41.5	4 415±40	4 998±93
60.5	7 470±40	8 305±52
70.5	8 550±50	9 526±23
95.5	12 890±70	15 017±119
164.5	14 930±70	17 965±198
291.0	19 190±160	22 798±215
394.5	22 495±80	27 034±155
451.5	24 595±90	29 408±162
672.5	32 305±115	37 698±188

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