Provenance of the Eocene-Miocene sediments in the Baiyun Sag, Pearl River Mouth Basin
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摘要:
运用地质与地球物理综合研究方法，对南海北部珠江口盆地白云深水区始新世—中新世的沉积充填特征开展研究，结果表明，在早中始新世，白云凹陷沉积环境经历了由陆相冲积扇到中深湖相的转变，晚始新世部分地区遭受海侵，沉积物源主要来自北部番禺低隆起和东沙及神狐构造高部位，以近源沉积为主。到早渐新世，凹陷沉积环境转变为海陆过渡相及海相环境，凹陷北部受番禺低隆起等局部物源控制，凹陷主体接受大量源自南海西部昆莺琼古河的物源供给。到晚渐新世，古珠江沉积范围增大，突破番禺低隆起进入白云凹陷，凹陷北部主体受古珠江搬运沉积物影响，凹陷其余地区则接受来自北部古珠江及西部昆莺琼古河双物源供给。进入中新世，由于盆地热沉降作用的加强，南海北部陆架坡折带由白云凹陷南部跃迁至北部，凹陷水深不断加深，凹陷主体受古珠江沉积物的控制，其中南部地区为深水环境，受到由浊流搬运来的北部古珠江物质、西部昆莺琼古河物质以及正常远洋沉积物的共同影响。
Abstract:Using both geological and geophysical methods, this paper aims to study the evolutionary and depositional features of the Baiyun Sag, Pearl River Mouth Basin, the Northern South China Sea. The results show that during the period of Early-Middle Eocene, the Baiyun Sag was prevailed by a transition from alluvial fan to deep lake facies, with marine transgression sometimes in late Eocene. The sediments are mainly sourced from the Panyu Lower Uplift and the Shenhu Plateau. In Early Oligocene, the study area turned gradually to transitional and marine environment. Provenances in the north part of the sag were controlled by the Panyu Lower Uplift, while the sag was mainly filled with sediments from the western SCS through “Kontum- Ying-Qiong” Rivers. The Pearl River started exerting influence on the north part of the sag in Late Oligocene as it passed over the Panyu Lower Uplift, and the rest parts of the sag were controlled by double sources from both the “Kontum-Ying-Qiong” River and the Pearl River. Since Miocene, the water depth constantly increased due to the southward jumping of slope break and increase in basin subsidance, which resulted in the fully domination of ancient Pearl River sediment and the complete transformation of the southern part into deep water environment. The southern part of the sag since then has been influenced by the mixed sedimentation of turbidity current with terrigenous and oceanic sediments.
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Key words:
- sedimentary environment /
- source evolution /
- zircon U-Pb /
- Baiyun Sag /
- South China Sea
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表 1 样品碎屑锆石数量及地层时代汇总
Table 1. Number of zircon grains and age of samples of this study
样品号 时代 碎屑锆石数量 L21-1 晚渐新世 167 L21-2 晚渐新世 106 L21-3 晚始新世—早渐新世 119 L21-4 早中始新世 110 L21-5 早中始新世 118 L21-6 早中始新世 116 L13-1 晚渐新世 97 L13-2 晚始新世—早渐新世 113 L13-3 晚始新世—早渐新世 93 L18-1 晚渐新世 126 L18-2 晚始新世—早渐新世 103 X28-1 晚渐新世 101 X28-2 晚始新世—早渐新世 102 B18-1 晚渐新世 124 B18-2 晚渐新世 99 B18-3 晚始新世—早渐新世 84 B18-4 晚始新世—早渐新世 105 L6-1 早中始新世 92 L6-2 早中始新世 70 L6-3 早中始新世 19 P3 早中新世 42 L3 早中新世 107 
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