U-Pb age characteristics of detrital zircon and provenance analysis of a Middle Miocene submarine fan in the Qiongdongnan Basin
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摘要:
琼东南盆地中中新统海底扇是南海北部天然气勘探的重要目标, 但长期以来对该海底扇沉积物的物源并未达成共识, 因此, 物源分析对于该区天然气勘探有利目标优选具有重要意义。通过钻井取心开展了碎屑锆石U-Pb年龄谱特征研究, 并与周缘潜在物源区锆石U-Pb年龄进行了对比分析, 示踪了研究区中中新统海底扇物源。结果表明: ①盆地北部N-1、N-2、N-3、N-4等4口井碎屑锆石U-Pb年龄表现为燕山期(160, 157, 133, 107, 102, 99 Ma)、印支期(249, 241, 239 Ma)、加里东期(466, 455 Ma)的年龄峰值特征, 且与中国海南岛碎屑锆石U-Pb年龄特征相似度高, 但与红河、越南中部碎屑锆石U-Pb年龄特征相似度低; ②盆地南部S-1、S-2、S-3等3口井碎屑锆石U-Pb年龄特征表现为印支期(242, 238, 237 Ma)、加里东期(435, 431, 425 Ma)、海西期(396, 392 Ma)以及燕山期(143 Ma)的年龄峰值特征, 且S-2井具有较年轻的喜马拉雅期(21 Ma)单峰年龄特征。琼东南盆地北部中中新统沉积物源主要来自海南岛, 红河及越南中部物源对其影响非常有限, 盆地南部中中新统为红河和海南岛双物源供给, 且以红河物源为主, 自西向东差异明显。
Abstract:Objective The middle Miocene submarine fan in the Qiongdongnan Basin is an important target for natural gas exploration in the northern South China Sea. However, there has been no consensus on the source of submarine fan sediments for a long time. Provenance analysis will be important for the optimization of natural gas exploration in this area.
Methods In this paper, the detrital zircon U-Pb age spectrum characteristics of drilling cores from the middle Miocene submarine fan in the Qiongdongnan Basin were analysed and compared with the U-Pb ages of zircons from potential provenance areas to determine the source of submarine fans in the study area.
Results The results show that ① the U-Pb ages of detrital zircons from the N-1, N-2, N-3 and N-4 wells in the northern part of the basin are characterized by Yanshanian (160, 157, 133, 107, 102, 99 Ma), Indosinian (249, 241, 239 Ma) and Caledonian (466, 455 Ma) age peaks and have high similarity with the U-Pb age characteristics of detrital zircons from Hainan Island sediments but low similarity with the U-Pb age characteristics of detrital zircons from Red River and central Vietnam sediments. ② The detrital zircon U-Pb ages of three wells (S-1, S-2, and S-3) in the southern part of the basin show peak ages of Caledonian (435, 431, 425 Ma), Hercynian (396, 392 Ma), Indosinian (242, 238, 237 Ma), and Yanshanian (143 Ma). The S-2 well has a younger unimodal Himalayan (21 Ma) age peak.
Conclusion The provenance of the middle Miocene in the northern part of the basin is Hainan Island. The influence of the provenance on the Red River and Central Vietnam is very limited. The provenance of the middle Miocene in the southern Qiongdongnan Basin was a double-source supply from the Red River and Hainan Island and was dominated by the former, with an obvious difference from west to east.
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Key words:
- zircon U-Pb age /
- provenance /
- submarine fan /
- Middle Miocene /
- Qiongdongnan Basin /
- detrital
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