西江三角洲岩心中的硅藻及其记录的古环境
Diatoms and their palaeoenvironments from the cores of Xijiang Delta in China
-
摘要: 通过对西江三角洲ZXZ1,ZXZ2两岩心沉积物样品的硅藻分析,共鉴定出硅藻168种和变种,隶属48个属;ZXZ1岩心可划分为六个硅藻带,ZXZ2岩心可划分为五个硅藻带。根据硅藻组合特征,结合粒度和14C测年结果,ZXZ1岩心的Ⅳ,Ⅴ,Ⅵ硅藻带和ZXZ2岩心的Ⅲ,Ⅳ,Ⅴ硅藻带属于全新世沉积;ZXZ1岩心的Ⅰ,Ⅱ,Ⅲ硅藻带和ZXZ2岩心的Ⅰ,Ⅱ硅藻带属于晚更新世沉积。分析了晚更新世以来沉积物的沉积相和沉积环境,结果表明,晚更新世时期ZXZ1岩心的沉积物属于近岸低盐海相沉积环境,而ZXZ2岩心的沉积物属于陆相沉积;在全新世时期两岩心均属近岸低盐的海相沉积环境。造成晚更新世时期两岩心沉积相的差异主要与断裂构造的升降运动有关。Abstract: Sedimentary diatoms of Cores ZXZ1 and ZXZ2 collected in the Xijiang Delta were studied.Total of 168 species and variants of diatom species belonging to 48 genera were identified; six bands of Core ZXZ1 and five bands of Core ZXZ2 were classified based on adiatom species property.And stratigraphic subdivision and a correlation analysis were made according to diatomanalysis together with grain-size data and 14C year data, It is found that 0~11.35 m (including Ⅳ,Ⅴ,Ⅵ diatom bands) of Core ZXZ1 belonged to the Holocene sedimentary, 11.35~35.6 m (including Ⅰ,Ⅱ,Ⅲ diat om bands) belonged to the Late Pleist ocene sedimentary; 0~9.9 m (including Ⅲ, Ⅳ,Ⅴ diatom bands) belonged to the Holocene sedimentary, 9.9~33 m (including Ⅰ, Ⅱ diatom bands) belonged to the Late Pleistocene sedimentary.The sedimentation and environment since Pleistocene have been discussed.Results showed that at the Late Pleist ocene Core ZXZ1 was in marine sedimentary environment, and Core ZXZ2 was in land sedimentary environment; at Holocene the two core were all in marine sedimentary environment.The different sedimentary environments at the Late Pleistocene were mainly due to vertical motion of fault block.
-
Key words:
- diatoms /
- Late Quaternary /
- Xijiang Delta in China
-
李春初.中国南方河口过程与演变规律[M].北京;科学出版社,2004:137-144. 中国海湾志编纂委员会.陈则实.吴聚云,夏东兴,等.中国海湾志:第十四分册(重要河口)[M].北京:海洋出版社,1998:279-182. 张虎男.断块型三角洲[J].地理学报,1980,35(1):58-67. 赵焕庭.珠江河口演变[M].北京:海洋出版社,1990:28-34. 赵焕庭,陈木宏,余家桢,等.珠江三角洲海进层微体古生物的初步研究[J].热带海洋,1987,6(1):28-38. 汪桂荣.珠江三角洲全新世硅藻[J].古生物学报,1998,37(3):305-325. 黄镇国,宗永强,何锐如,等.珠江三角洲第四系化石硅藻的指相意义[J].海洋学报,1985,7(6):744-750. 雷作淇.郑卓.黄茅海晚第四纪孢粉组合与环境变迁[J].热带海洋,1990,9(4);24-28. 方国祥,李平日.珠江三角洲8 000年来海平面变化[J].地理研究,1991,10(4):1-11. 郑卓,王建华.珠江三角洲北部晚更新世以来的沉积特征[J].热带海洋,1998,17(3):1-9. 徐明广,马道修,周青伟,等.珠江三角洲地区第四纪海平面变化[J].海洋地质与第四纪地质,1986,6(3):93-102. 马道修,徐明广,周青伟,等.珠江三角洲沉积相序[J].海洋地质与第四纪地质,1988,8(1):43-53. 齐雨藻,林兰英,张子安,等.从化石硅藻分析东江三角洲的沉积相[J].热带地理,1981,(3):45-50. 李平日,乔彭年,郑洪汉,等.珠江三角洲一万年来环境演变[M].北京:海洋出版社,1991:24-40,60-78. -
点击查看大图
计量
- 文章访问数: 711
- HTML全文浏览量: 6
- PDF下载量: 1160
- 被引次数: 0
下载:
