Geochemical characteristics of the Permian sedimentary rocks from Qiangtang Basin: Constraints for paleoenvironment and paleoclimate
Geochemical characteristics of the Permian sedimentary rocks from Qiangtang Basin: Constraints for paleoenvironment and paleoclimate
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羌塘盆地二叠纪沉积岩地球化学特征：古环境和古气候的制约
DOI：
10.3319/tao.2016.08.08.01
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Shen Bin
中科院分区：
文献类型：
--
作者：
Hu Junjie;Li Qi;Song Chunyan;Wang Shuangqing;Shen Bin
羌塘盆地有望成为中国重要的战略石油开发地区。然而，对该地区二叠纪地层的研究很少。本文介绍了交木里地区下二叠统展金组地球化学资料，重建了古沉积环境，为进一步勘探提供了信息。研究了19个样品的地球化学特征。这些地球化学样品显示出发育的泥地特征，粘土含量轻而富。利用地质资料对古氧化还原环境进行了约束，P/Ti（平均值0.07）和Ba/Al（平均值20.5）表明这些沉积物主要沉积在弱氧水柱下，古生产力相对较低。c值（0.24 ~ 1.75）和Sr/Cu值（1.28 ~ 11.58）等古气候指标反映了湛金组沉积时期的湿润气候条件。ω(La)N/ω(Yb)N比值表明沉积期沉积速率较快。文章历史：收稿2016年2月24日修改2016年7月27日接受2016年8月8日
Qiangtang Basin is expected to become important strategic petroleum exploitation area in China. However, little research has been done on the Permian strata in this area. This paper presents Lower Permian Zhanjin Formation geochemical data from the Jiaomuri area, reconstructing the paleo-depositional environment and providing information for further petroleum exploration. The geochemical characteristics of 19 samples were investigated. These geochemical samples show a developed mud flat characteristic with light rich clay content. The geological data were used to constrain the paleoredox environment, which proved that these sediments were deposited mainly beneath a slightly oxic water column with relatively low paleoproductivity as evidenced by the P/Ti (mean of 0.07) and Ba/Al (mean of 20.5). Palaeoclimate indexes such as the C-value (0.24-1.75) and Sr/Cu (1.28-11.58) reveal a humid climatic condition during Zhanjin Formation sediment deposition. The ω(La)N/ω(Yb)N ratio values indicate a fast sedimentary rate during the deposition period. Article history: Received 24 February 2016 Revised 27 July 2016 Accepted 8 August 2016