GSTDTAP  > 地球科学
DOI10.1130/B35319.1
Paleosalinity assessment and its influence on source rock deposition in the western Pearl River Mouth Basin, South China Sea
Quan, Yongbin1; Liu, Jianzhang1; Hao, Fang1,2; Cai, Zhongxian1; Xie, Yuhong3
2020-07-01
发表期刊GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
EISSN1943-2674
出版年2020
卷号132期号:7-8页码:1741-1755
文章类型Article
语种英语
国家Peoples R China
英文摘要

Paleosalinity is an important environmental feature but it is difficult to evaluate. In the present study, paleosalinity was assessed during the deposition of three sets of source rocks in the western Pearl River Mouth Basin, South China Sea, utilizing four different kinds of methods, i.e., saturated hydrocarbon biomarkers, strontium abundance, nonpollen microalgae assemblies, and carbonsulfur relationships.


Results show that the second member of the Eocene Wenchang Formation (E(2)w(2)) was deposited in a freshwater environment and the Oligocene Zhuhai Formation (E(3)z) was deposited in a shallow marine environment. The Oligocene Enping Formation (E(3)e), which was believed to be deposited in a freshwater environment, was actually deposited in a brackish water environment. Mechanisms of salinity increase during the non-marine E(3)e deposition were mainly deep hydrothermal fluid input through the south boundary fault and episodic marine transgressions, not evaporation. The effect of salinity on organic matter content and type was investigated. Results show that salinity has no significant influence on total organic carbon (TOC) and hydrogen index (HI) of the E(2)w(2), which was caused by the balance between freshwater algae and euryhaline algae. TOC and HI decrease with increasing salinity for samples from the E(3)z, which is contrary to the conventional hypothesis that marine transgressions promote source rock deposition. The decrease of TOC with carbon/sulfur ratios for samples from the E(3)e actually reflect the influence of thermal maturity but thermal maturity only plays the second role in HI. The effect of salinity on HI tquanyongbin@cug.edu.cn. Corresponding author: haofang@cug.edu.cn . during the E(3)e deposition can be divided into two stages. During the first stage, the increase of salinity was mainly caused by deep hydrothermal fluid input without an oxygen level increase. HI values, therefore, remained relatively stable. During the secondary stage, the increase of salinity was mainly caused by marine transgressions which increased the oxygen level and as a consequence, HI decreased sharply with increasing salinity. during the E(3)e deposition can be divided into two stages. During the first stage, the increase of salinity was mainly caused by deep hydrothermal fluid input without an oxygen level increase. HI values, therefore, remained relatively stable. During the secondary stage, the increase of salinity was mainly caused by marine transgressions which increased the oxygen level and as a consequence, HI decreased sharply with increasing salinity.


This study provides a long-term salinity evolution of the western Pearl River Mouth Basin and suggests that salinity is an important factor controlling source rock deposition. In addition, this study presents an example that goes against conventional wisdom that marine transgressions promote source rock deposition in a shallow marine environment. This study also suggested that marine transgressions had already begun at the end of the early Oligocene.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000545115400022
WOS关键词NON-POLLEN PALYNOMORPHS ; ORGANIC-CARBON CONTENT ; ZHU-III SUBBASIN ; CRUDE OILS ; GEOCHEMICAL CHARACTERISTICS ; SEDIMENTATION-RATE ; PETROLEUM SYSTEMS ; SONGLIAO BASIN ; NANXIANG BASIN ; EASTERN CHINA
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/289436
专题地球科学
作者单位1.China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China;
2.China Univ Petr, Sch Geosci, Qingdao 266580, Peoples R China;
3.China Natl Offshore Oil Corp Ltd, Beijing 100010, Peoples R China
推荐引用方式
GB/T 7714
Quan, Yongbin,Liu, Jianzhang,Hao, Fang,et al. Paleosalinity assessment and its influence on source rock deposition in the western Pearl River Mouth Basin, South China Sea[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(7-8):1741-1755.
APA Quan, Yongbin,Liu, Jianzhang,Hao, Fang,Cai, Zhongxian,&Xie, Yuhong.(2020).Paleosalinity assessment and its influence on source rock deposition in the western Pearl River Mouth Basin, South China Sea.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(7-8),1741-1755.
MLA Quan, Yongbin,et al."Paleosalinity assessment and its influence on source rock deposition in the western Pearl River Mouth Basin, South China Sea".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.7-8(2020):1741-1755.
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