句容地区下奥陶统仑山组海平面变化的碳酸盐岩地球化学记录

doi:10.13278/j.cnki.jjuese.201705110

摘要/Abstract

摘要： 句容地区下奥陶统仑山组碳酸盐岩沉积主要由开阔台地和深水陆棚组成，仑山组层序1和层序2均由低位体系域和海侵体系域构成，反映两次海侵过程。根据δ¹³C值、Sr/Ba值、1 000Sr/Ca值和V/Ni值反映的古盐度、古水深曲线，结合沉积环境变迁与体系域特征，绘制了仑山组海平面相对升降曲线。一级海平面相对升降曲线反映仑山组时期经历了一次海侵。二级海平面波动曲线显示海平面波动频繁，由两次海平面相对上升和一次海平面相对下降组成。仑山组样品碳、氧同位素组成受后期成岩作用影响较小，基本保留了原始海洋的同位素组成：δ¹³C值为-0.8‰~2.3‰，均值为0.45‰；δ¹⁸O值为-14.4‰~-9.3‰，均值为-10.2‰，主要集中在-10.0‰~-9.0‰的范围内。利用δ¹³C和δ¹⁸O值计算得到的Z值全部大于120，反映仑山组碳酸盐岩在海相环境中形成。

关键词: 句容, 下奥陶统, 仑山组, 元素地球化学, 碳氧同位素, 海平面变化

Abstract: The Lower Ordovician carbonate sedimentation of Lunshan Formation in Jurong area is composed of an open platform and a deep-water shelf. The sequences 1 and 2, two transgression processes, are both composed of the low stand system and the transgressive system tracts. The relative sea-level lifting curves of Lushan Formation can be drawn based on the paleo-salinity and paleo-bathymetric curves reflected by the values of δ¹³C, Sr/Ba, 1 000Sr/Ca and V/Ni, combined with the sedimentary environment change and system tract features. The Level I sea-level relative lifting curve reflects that Lunshan Formation underwent a transgression. The Level Ⅱ sea-level curve shows that the sea-level fluctuated frequently. A fluctuation included two sea-level relative rises and one fall. The composition of oxygen and carbon isotope in Lunshan Formation was less affected by the late diagenesis, and it retained basically the original marine isotope composition. The δ¹³C value falls between -0.8‰ and 2.3‰, and the mean is 0.45‰. The δ¹⁸O value falls between -14.4‰ and -9.3‰ and the mean is -10.2‰, mainly in the range of -10.0‰——9.0‰. The Z values calculated from δ¹³C and δ¹⁸O are all greater than 120, which reflects that the carbonate in Lunshan Formation formed in a marine environment.

Key words: Jurong, Lower Ordovician, Lunshan Formation, element geochemistry, oxygen and carbon isotope, sea-level change

中图分类号:

P588.245

许中杰, 蓝艺植, 程日辉, 李双林. 句容地区下奥陶统仑山组海平面变化的碳酸盐岩地球化学记录[J]. 吉林大学学报(地球科学版), 2017, 47(5): 1458-1470.

Xu Zhongjie, Lan Yizhi, Cheng Rihui, Li Shuanglin. Carbonate Geochemical Record of Sea-Level Change of Lunshan Formation in Lower Ordovician in Jurong Area[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(5): 1458-1470.

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