Environmental Significance and Clay Mineral Characteristics of YZ1 Core Sediments in Zhouzhuang, Northern Jiangsu Plain
Received date: 2011-03-23
Request revised date: 2011-06-04
Online published: 2012-02-20
Copyright
The clay mineral was widely distributed in the quaternary sediments. The present research shows that the clay mineral was a product which effects by the diagenesis and sedimentation, under the certain climatic and sediment source condition. And it was a good substitution index for reconstructing the change of palaeoenvironment. This paper chosed the lacustrine sediment as study object which was near the subsidence center of Subei plain. Based on X-ray diffraction (XRD) analysis, the clay mineral components and their assemblage feature of one core sediments(YZ1)in Subei plain were measured. The characteristics and environmentical significance of clay minerals were analyzed. The results show that the main clay minerals in YZ1 core sediments were illite, kaolinite, chlorite and smectite, and feldspar and quartz piece were minor. The palaeoclimate of the study area has experienced three stages: 13 770 -11 600 cal a B.P.,relative cold-dry period in climate. During the period, kaolinite content was with relatively low value, illite, smectite content and crystallinity were relatively high, indicating a cold-dry palaeoclimate. 11 600-9 610 cal a B.P., it grew warmer and went intowarm-moisture period. Kaolinite content increased observably, and smectite and illite decreased, suggesting atemperature and humidity gradually increase palaeoclimate. 9 610-1 520 cal a B.P.,relative warm-moisture period. Kaolinite content was with relatively high value, while illite and smectite content were relatively low. Crystallinity also showed relatively low, suggesting a relatively warm and humid palaeoclimate. In addition, theclay mineral indexes also recorded several sub cold-warm changes under the background of three main period.
Key words: clay mineral; environmental significance; northern Jiangsu plain
SHU Qiang , CHEN Ye , ZHANG Mao-heng , ZHAO Zhi-jun . Environmental Significance and Clay Mineral Characteristics of YZ1 Core Sediments in Zhouzhuang, Northern Jiangsu Plain[J]. SCIENTIA GEOGRAPHICA SINICA, 2012 , 32(2) : 238 -243 . DOI: 10.13249/j.cnki.sgs.2012.02.238
Fig.1 Location of YZ1 core in Xinghua图1 兴化市YZ1钻孔位置 |
Table 1 AMS14C dating results of samples from YZ1 core表1 YZ1浅钻沉积物样品AMS14C测年结果 |
实验室编号 | 样品编号 | 取样深度(cm) | 样品描述 | 14C年龄(a B.P.) | 校正年龄(cal a B.P.) |
---|---|---|---|---|---|
LAMS06-087 | YZ1-1 | 351~355 | 沉积物 | 6980±40 | 7911±18 |
LAMS06-088 | YZ1-2 | 545~549 | 沉积物 | 10110±50 | 11782±95 |
LAMS06-089 | YZ1-3 | 592~596 | 沉积物 | 11335±50 | 13213±95 |
Fig.2 Variations of clay mineral concentrations in YZ1 core图2 YZ1浅钻沉积物粘土矿物含量变化 |
Fig.3 Comparison of climatic proxies among YZ1 core, GISP2 ice core and Dongge stalagmite δ18O record图3 YZ1浅钻沉积记录与GISP2冰芯和董歌洞石笋记录的对比 |
The authors have declared that no competing interests exist.
[1] |
|
[2] |
|
[3] |
|
[4] |
|
[5] |
|
[6] |
|
[7] |
|
[8] |
|
[9] |
|
[10] |
|
[11] |
|
[12] |
|
[13] |
|
[14] |
|
[15] |
|
[16] |
|
[17] |
|
[18] |
|
[19] |
|
[20] |
|
[21] |
|
[22] |
|
[23] |
|
[24] |
|
[25] |
|
[26] |
|
[27] |
|
[28] |
|
[29] |
|
[30] |
|
[31] |
|
[32] |
|
[33] |
|
[34] |
|
[35] |
|
/
〈 | 〉 |