SEDIMENTARY CYCLE AND STRONTIUM,CARBON,OXYGEN ISOTOPES OF THE SILURIAN AT LUGUHU REGION IN NINGLANG COUNTY OF WESTERN MARGIN OF YANGTZE PLATFORM

Abstract

Abstract: The sedimentary cycle and strontium, carbon, oxygen isotopic characteristics of Silurian carbonate at Luguhu region in Ninglang County of western margin of Yangtze Platform are studied in this paper. The relationship between the isotopic curves and sea level changes and regional crustal uplifts is also discussed. The research results indicate that the Silurian is mainly composed of tidal carbonate sedimentary facies besides a small part of fine clastic sediments in the bottom. Its strontium, carbon and oxygen isotopic values vary in the range of 0.7093~0.7196, —1.280%~2.674‰ and -1.302‰~—10.713‰, respectively, and the average isotopic values are 0.7114, 0.984‰ and -7.810‰, respectively. Because it is influenced by the regional crustal uplift, the isotopic components and isotopic evolutionary curves are not closely related with global sea level changes during the Silurian.

Key words: western margin of Yangtze Platform, Silurian, sedimentary cycle, strontium isotope, carbon isotope, oxygen isotope

摘要： 本文系统研究了扬子地台西缘宁蒗泸沽湖地区志留系沉积旋回及海相碳酸盐岩的锶、碳、氧同位素特征, 并对同位素曲线演化规律与海平面变化和区域地壳运动的关系进行了探讨。研究结果表明, 本区志留系除底部有少量细碎屑岩沉积外, 主要为浅海潮坪相碳酸盐岩沉积, 其锶、碳、氧同位素值变化范围分别是0.7093~0.7196—1.28‰~2.74‰和-1.302‰~-10.721‰ 平均值分别是0.7114、0.984‰和-7.810‰。由于受区域地壳隆升运动的影响,同位素组成和同位素演化规律与海平面变化的关系并不明显。

关键词: 扬子地台西缘, 志留系, 沉积旋回, 锶同位素, 碳同位素, 氧同位素

CLC Number:

Li Zhongxiong, Guan Shiping. SEDIMENTARY CYCLE AND STRONTIUM,CARBON,OXYGEN ISOTOPES OF THE SILURIAN AT LUGUHU REGION IN NINGLANG COUNTY OF WESTERN MARGIN OF YANGTZE PLATFORM[J]. JOPC, 2001, 3(4): 69-76.

李忠雄, 管士平. 扬子地台西缘宁蒗泸沽湖地区志留系沉积旋回及锶、碳、氧同位素特征[J]. 古地理学报, 2001, 3(4): 69-76.

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