西江断裂三水至磨刀门段第四纪活动性再研究

doi:10.11978/2016067

Abstract

Abstract:

The Xijiang Fault is an important fault of the Pearl River Delta. To learn the quaternary activity of the Xijiang Fault furtherly, geological mapping in 1:50000 scale, age dating, shallow seismic reflection and drilling verification were performed. The results show that the quaternary geomorphology and fracture coupled. The character of historical seismic reflection shows the fault is still active. Field survey and shallow seismic reflection show that the fault didn’t cut quaternary strata. Chronology shows that the activity strength was relatively strong before the Late Pleistocene, and became weak afterward. Tectonic analysis of Modaomen indicates that there is a sudden change in the sedimentation rate at both sides of the fault, but activity strength is weaker. In short, the Xijiang Fault is still active, but its strength is weak.

Key words: Pearl River Delta, Xijiang Fault, quaternary geomorphology, shallow seismic reflection, chronology, the quaternary activity

CLC Number:

P736

Haogang DONG, Yuda CHEN. Re-visiting the Quaternary activity of Xijiang Fault from Sanshui to Modaomen[J].Journal of Tropical Oceanography, 2017, 36(2): 26-32.

Figures/Tables 6

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References 17

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序号	地点(断裂)	断层物质	年龄/kaBP	测试法	测试单位
1	隔田-1(FOO3)	断层泥	285±19.0	ESR	地震动力学国家重点实验室
2	隔田-2(FOO3)	构造岩	424±15.3	ESR	地震动力学国家重点实验室
3	九江河段(FOO4)	断层泥	44.2±5.0	ESR	地震动力学国家重点实验室
4	了哥山(FOO3)	断层泥	49.5±9.0	ESR	地震动力学国家重点实验室
5	了哥山(FOO3)	断层泥	99.7±12.0	TL	中山大学
6	了哥山(FOO3)	构造岩	146.6±13.0	TL	中山大学
7	岐样里(FOO4)	断层泥	95±9.0	TL	地震动力学国家重点实验室
8	岐样里(FOO3)	断层泥	100.6±10.0	TL	地震动力学国家重点实验室
9	横坑里(FOO3)	断层泥	285.6±25.0	TL	中山大学
10	天台山(FOO3)	构造碎裂岩	443±29.0	ESR	地震动力学国家重点实验室
11	斗门水磨岩(FOO5)	构造碎裂岩	200.8±14.0	ESR	地震动力学国家重点实验室
12	鸡啼门(FOO5)	构造碎裂岩	79.3±9.0	ESR	地震动力学国家重点实验室

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Re-visiting the Quaternary activity of Xijiang Fault from Sanshui to Modaomen

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