30 ka以来东阿拉伯海U1456站位粘土粒级碎屑沉积物来源及其古环境意义

陈红瑾; 徐兆凯; 蔡明江; 李铁刚

doi:10.3799/dqkx.2018.185

30 ka以来东阿拉伯海U1456站位粘土粒级碎屑沉积物来源及其古环境意义

doi: 10.3799/dqkx.2018.185

陈红瑾^1,2,,
徐兆凯^1,3, ,,
蔡明江^1,2,
李铁刚^2,3,4

1.
中国科学院海洋研究所海洋地质与环境重点实验室, 山东青岛 266071
2.
中国科学院大学, 北京 100049
3.
青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室, 山东青岛 266061
4.
国家海洋局第一海洋研究所海洋沉积与环境地质国家海洋局重点实验室, 山东青岛 266061

基金项目:

中国科学院战略性先导科技专项(A类) XDA11030104

国家自然科学基金项目 41106043

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资助项目 U1606401

国家自然科学基金项目 41676038

国家海洋局全球变化与海气相互作用专项项目 GASI-GEOGE-06-02

国家海洋局全球变化与海气相互作用专项项目 GASI-GEOGE-04

国家海洋局全球变化与海气相互作用专项项目 GASI-GEOGE-02

国家自然科学基金项目 41230959

国家自然科学基金项目 41476043

国家自然科学基金项目 41376064

详细信息

作者简介:
陈红瑾(1993-), 女, 硕士研究生, 主要从事海洋地质学研究工作

通讯作者:
徐兆凯

中图分类号: P67
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- 被引次数: 0
出版历程
- 收稿日期: 2019-01-18
- 刊出日期: 2019-08-15

Provenance of Clay-Sized Detrital Sediments and Its Paleoenvironmental Implications at Site U1456 in the Eastern Arabian Sea since 30 ka

Chen Hongjin^{1,2
,},
Xu Zhaokai^{1,3
, ,},
Cai Mingjiang^1,2,
Li Tiegang^2,3,4

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Laboratory of Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
4.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanology, SOA, Qingdao 266061, China

摘要

摘要: 通过对国际大洋发现计划U1456站位沉积物AMS ¹⁴C年代、粘土矿物、常量元素及粒度组成的综合分析，探讨了东阿拉伯海粘土粒级碎屑沉积物的源-汇过程及其古环境指示意义.30 ka以来U1456站位的粘土矿物组合以蒙脱石和伊利石为主，并含有少量的绿泥石和高岭石.物源分析结果表明粘土粒级碎屑沉积物主要来自于印度河与德干高原.30 ka以来西南季风很可能是影响喜马拉雅山脉以及印度大陆风化剥蚀的重要因素.在西南季风减弱的阶段，印度河物源端元对研究区的输入量减少，这可能与此时热带辐合带的南移及末次冰盛期喜马拉雅山脉冰川覆盖面积的增加有关，从而导致印度河径流量及喜马拉雅山脉可供风化剥蚀的区域减少.K/Al比值指示的源区大陆化学风化作用强度与前人重建的西南季风记录间较为同步，在东阿拉伯海可以作为晚第四纪以来西南季风演化的有效重建指标.
- 东阿拉伯海 /
- 粘土矿物 /
- 常量元素 /
- 物质来源 /
- 风化剥蚀 /
- 西南季风
Abstract: AMS ¹⁴C dating, clay minerals, major elements and grain size at site U1456 from International Ocean Discovery Program were analyzed, in order to constrain the source-to-sink processes of clay-sized detrital sediments and their paleoenvironmental significance in the eastern Arabian Sea. The clay mineral assemblages at site U1456 since 30 ka are dominated by smectite and illite, with minor chlorite and kaolinite. Provenance analysis results suggest that clay-sized detrital sediments are primarily derived from the Indus River and Deccan Trap. Southwest Asian monsoon probably is the main factor affecting the weathering and erosion in the western Himalaya and the Indian subcontinent since 30 ka. Relatively reduced contribution from the Indus River to the study area during weak southwest Asian monsoon intervals should correlate with the southward migration of the Intertropical Convergence Zone and the extension of glacial cover over the Himalayas during the Last Glacial Maximum, and thus reduction in the Indus River runoff as well as available exposure area for erosion and weathering over the Himalayas. The weathering and erosion on the continent revealed by K/Al ratio show coherent variations to the previous southwest Asian monsoon records, indicating the efficiency of K/Al ratio for tracking the regional climate signal in the eastern Arabian Sea since the late Quaternary.
- eastern Arabian Sea /
- clay mineral /
- major elements /
- provenance /
- erosion and weathering /
- southwest Asian monsoon

HTML全文

图 1 阿拉伯海U1456站位，南亚季风、洋流及相关典型站位示意图

1. ODP 722; 2. DSDP 222; 3. Indus-23; 4. SK 148/22; 5. SK 148/21; 6. SK 148/38; 7. GC 3; 8. GC 5

Fig. 1. Schematic map showing the site U1456, South Asian monsoon, ocean currents and typical sites

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图 2 U1456站位粘土矿物X-射线典型衍射图谱（样品深度92 cm，年龄20.9 ka）

Fig. 2. Typical X-ray diagrams of clay mineral at site U1456

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图 3 U1456站位线性沉积速率（LSR）、中值粒径及粘土矿物组成、结晶度和比值剖面变化

YD代表新仙女木事件；H1、H2和H3分别代表Heinrich 1、Heinrich 2和Heinrich 3事件；LGM代表末次盛冰期

Fig. 3. Vertical changes of linear sedimentation rate, median grain size, clay mineral composition, clay mineral crystallinity and clay mineral ratio of site U1456

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图 4 U1456站位线性沉积速率（LSR）、中值粒径及常量元素（K、Al、Mg）百分含量及比值剖面变化

Fig. 4. Vertical changes of linear sedimentation rate, median grain size, percentages of major elements (K, Al, Mg), major element ratios of site U1456

下载: 全尺寸图片幻灯片

图 5 U1456站位不同阶段粘土矿物组合及其与潜在物源（印度河、德干高原及片麻岩区）粘土矿物组合间对比

Fig. 5. Comparison of clay mineral assemblages among site U1456 during different stages and the potential provenances

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图 6 U1456站位典型粘土矿物比值与前人研究成果间对比

Fig. 6. Comparison of typical clay minerals ratio at site U1456 and previous research results

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表 1 U1456站位C孔AMS¹⁴C年代数据

Table 1. AMS¹⁴C age, calibrated calendar age, and sedimentation rate of site U1456

层位(cm)	AMS ¹⁴C年龄(a)	日历年龄(cal. a; ±2σ)	沉积速率(cm/ka)	测试材料
12	6 550±30	7 652~7 480	1.64	Globigeriniodes sacculifer
22	8 510±30	9 865~9 549	4.74
42	1 110±40	13 272~13 035	5.86
62	1 456±50	18 091~17 705	4.21
92	17 120±60	21 080~20 622	10.33
102	17 330±70	21 412~20 869	37.45
132	20 760±80	25 542~25 012	7.32
142	21 810±80	26 424~25 948	9.24
182	24 680±100	29 185~28 596	15.01
192	24 910±100	29 438~28 802	46.51

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表 2 东阿拉伯海U1456站位常量元素含量（%）间相关性

Table 2. Correlation of major elements at site U1456 in the eastern Arabian Sea ^a)

	Al	Ca	Fe	K	Mg	Mn	Na	P	Ti
Al	1.00
Ca	-0.26	1.00
Fe	-0.07	-0.20	1.00
K	0.45*	0.17	-0.13	1.00
Mg	0.66*	-0.24	-0.06	0.48*	1.00
Mn	0.26	0.21	-0.04	0.58*	0.48*	1.00
Na	-0.24	0.24	-0.15	-0.39*	-0.29	-0.05	1.00
P	-0.26	0.43*	-0.12	0.30	-0.10	0.29	0.30	1.00
Ti	-0.05	0.18	0.30	-0.34	-0.42*	-0.23	0.31	0.21	1.00
注：*代表在0.05水平上显著相关

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表 3 东阿拉伯海潜在物源的粘土矿物组合对比^(a)

Table 3. Comparison among the clay mineral assemblages of potential provenances for the eastern Arabian Sea

阶段	潜在物源	数据来源	蒙脱石（%）	伊利石（%）	高岭石（%）	绿泥石（%）	伊利石结晶度
晚更新世	印度河	SK 148/22^(c)	7.00	70.00	5.00	18.00	—
		SK 148/21^(c)	9.00	61.00	6.00	23.00	—
		Keti Bandar^(b)	40.50±3.74	46.25±2.76	4.13±1.36	9.12±0.83	0.30±0.03
	德干高原	SK 148/38^(c)	62.00	21.00	12.00	5.00	—
	片麻岩区	GC 3	34.00±3.20	32.00±6.92	19.00±4.81	14.00±2.86	0.45±0.13
	片麻岩区	GC 5	24.00±6.80	31.00±7.21	27.00±5.32	17.00±2.65	0.45±0.13
全新世	印度河	SK 148/22^(c)	34.00	44.00	4.00	18.00	—
		SK 148/21^(c)	31.00	48.00	5.00	16.00	—
		Keti Bandar^(b)	45.11±3.40	40.47±2.14	4.42±1.43	9.68±2.52	0.31±0.03
		Indus-23	40.05±3.88	49.38±3.95	3.08±0.53	7.85±1.44	0.34±0.02
	德干高原	SK 148/38^(c)	76.00	12.00	7.00	5.00	—
	德干高原	坎贝湾^(c)	73.00	7.00	10.00	10.00	—
	片麻岩区	GC 3	27.00±2.44	41.00±6.28	20.00±3.37	12.00±1.77	0.41±0.13
	片麻岩区	GC 5	36.00±8.24	16.00±8.54	31.00±3.85	17.00±2.79	0.41±0.13
注：a.潜在物源的粘土矿物组合据文献(Rao and Rao, 1995; Thamban et al., 2002; Kessarkar et al., 2003; Alizai et al., 2012; Limmer et al., 2012a)；b.位于印度河三角洲（图 1）；c.粘土矿物组合为多个样品平均值

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