QUATERNARY TECTONIC FEATURES OF THE FUMAYING HIDDEN AREA OF THE ANQIU-JUXIAN FAULT

doi:10.3969/j.issn.0253-4967.2022.05.005

Abstract

Abstract:

The Anqiu-Juxian Fault is an important seismogenic fault in the eastern China, along which many strong earthquakes occurred in history. From north to south, the fault can be divided into Anqiu section, Juxian-Tancheng section and Xinyi-Sihong section. According to the spatial distribution, occurrence and activity characteristics of the fault, the Anqiu section also can be divided into five sub-sections, which are the north of Changyi sub-section, the Changyi-Nanliu sub-section, the Anqiu-Mengtuan sub-section, the Qingfengling sub-section and the Mengyan sub-section. Since the late Quaternary, the activity of the Anqiu-Juxian Fault can be divided into two branches, namely, the west branch F_5-1 and the east branch F_5-2. There is a hidden area of the fault around Fumaying village, Weifang, Shandong Province. In order to find out the fault features of the hidden area on the Anqiu-Changyi segment of the fault, the geological-geomorphological investigation, shallow artificial seismic prospecting, combined drilling, trenching and OSL dating were carried out. Through the above work, we obtained the following understandings: 1)The results of geological and geomorphological survey and shallow seismic profiles show that the Meicun-Shuangguan segment of Anqiu-Juxian Fault can also be divided into F_5-1 and F_5-2. The branch F_5-2 of the fault is hidden in the Quaternary layers, and the west branch F_5-1 exposes at the east slope of the hills. The area between the two branches of the fault is the Fumaying hidden area in this paper. 2)The combined drilling section in the Fumaying hidden area shows that the east branch F_5-2 passes through between the drillings Z₄ and Z₅, and the upper breakpoint can be inferred to extend to the interior of the layer w₂ of Heituhu formation of Holocene series, buried at the depth of 4.2~6.9m. The shell was sampled as ¹⁴C dating sample at the bottom of Heituhu formation, and the result from the sample No. ¹⁴C-1 is(9.79±0.03)kaBP, indicating that the latest active age of the east branch is the Holocene. 3)Between the two branches, a long strip-shaped Quaternary basin is formed along the east branch fault. The Quaternary at the west side of the fault developed well, and the layers of lower Pleistocene, middle Pleistocene, upper Pleistocene and Holocene can be seen in the drilling cores; Only the upper Pleistocene and Holocene deposited at the east side. This phenomenon indicates that the Fumaying Basin deposited in the early-middle Quaternary and has the characteristics of the faulted basin. 4)There are different activities in different periods between the two branches of the Anqiu-Juxian Fault. The Fumaying hidden segment of the east branch F_5-2 was active obviously in the early-middle Quaternary, and still active since the late Quaternary. According to the geological and geomorphological survey, there is a set of the late Pleistocene yellow silt strata offset by the west branch F_5-1, indicating that the latest active age of the west branch is the late Pleistocene.

Key words: Anqiu-Juxian Fault, Fumaying village, hidden area, fault features

摘要：

安丘-莒县断裂是中国东部重要的发震断裂, 历史上发生过多次强震。为厘清该断裂安丘-昌邑段驸马营覆盖区的断裂特征, 开展了地质地貌调查、浅层人工地震勘探、钻孔联合剖面探测和探槽开挖工作。文中获得了以下几点认识: 1)地质地貌调查和浅震勘探结果表明, 安丘-莒县断裂眉村-双官段可分为2支, 分别为断裂西支F_5-1 和东支F_5-2, 西支断裂F_5-1 在丘陵东坡出露, 东支断裂F_5-2 隐伏于第四系中。2)驸马营覆盖区的钻孔探测结果表明, 断裂东支F_5-2 在钻孔Z₄和Z₅之间通过, 上断点可推测延伸至层w₂全新统黑土湖组内部, 埋深为4.2~6.9m, 在黑土湖组底部取¹⁴C贝壳样品¹⁴C-1, 其结果为(9.79±0.03)kaBP, 表明东支断裂曾于全新世活动。3)在2支断裂之间沿东支断裂形成了长条形的第四纪盆地, 东支F_5-2 断裂西侧第四系发育较完整, 岩心见下更新统、中更新统、上更新统和全新统; 东侧仅沉积了上更新统和全新统, 表明驸马营盆地在第四纪早期和中期一直接受沉积, 具有断陷盆地的特点。4)安丘-莒县断裂的东支和西支在不同时期的活动强度存在差异, 断裂东支F_5-2 的驸马营隐伏段在第四纪早-中期活动强烈, 晚第四纪以来仍有活动。经地质地貌调查发现, 断裂西支F_5-1 错断地质剖面晚更新世黄色粉土, 断裂的最新活动时代为晚更新世。

关键词: 安丘-莒县断裂, 驸马营, 覆盖区, 断裂特征

WANG Lei, XU Hong-tai, WANG Zhi-cai, YANG Chuan-cheng, ZHANG Jian-min, WANG Dong-lei, XIA Nuan, CAI Ming-gang, LU Ren-qi, REN Zhi-kun. QUATERNARY TECTONIC FEATURES OF THE FUMAYING HIDDEN AREA OF THE ANQIU-JUXIAN FAULT[J]. SEISMOLOGY AND GEOLOGY, 2022, 44(5): 1156-1171.

王雷, 许洪泰, 王志才, 杨传成, 张建民, 王冬雷, 夏暖, 蔡明刚, 鲁人齐, 任治坤. 安丘-莒县断裂驸马营覆盖区第四纪活动特征[J]. 地震地质, 2022, 44(5): 1156-1171.

Figures/Tables 9

Fig. 1 Geological map of Weifang segment of the Yishu fault zone and surrounding areas.

Fig. 2 The distributions of the faults around the Fumaying village.

Fig. 3 Outcrop sections of the Anqiu-Juxian Fault.

Fig. 4 Shallow seismic profile(L1) of the Anqiu-Juxian Fault in the north of Meicun town.

Fig. 5 Shallow seismic profile(L2) of the Anqiu-Juxian Fault.

Fig. 6 Shallow seismic profile(L3)of the Anqiu-Juxian Fault in Fumaying.

Fig. 7 Combined drilling section of the Anqiu-Juxian Fault in Fumaying.

Table1 OSL samples from the composite drilling section in Fumaying

野外样品编号	取样深度/m	环境剂量率/Gy·ka^-1	等效剂量/Gy	年代
FM-OSL-1	12.8~13.0	2.4±0.2	65.5±8.2	(27.1±3.4)ka BP
FM-OSL-2	21.8~22.0	2.5±0.3	113.1±16.5	(45.5±6.6)ka BP
FM-OSL-3	30.8~31.0	2.8±0.3	180.9±14.3	(64.6±5.1)ka BP
FM-OSL-4	42.6~42.8	2.4±0.2	168.4±16.2	(70.4±5.9)ka BP
FM-OSL-5	47.7~47.9	2.4±0.2	186.4±19.2	(77.6±5.8)ka BP
FM-OSL-6	52.8~53.0	2.6±0.3	257.7±25.2	(107.1±11.4)ka BP

Fig. 8 Trench sections of the Anqiu-Juxian Fault in Fumaying.

References 28

[1]	蔡明刚, 鲁人齐, 苏鹏, 等. 2021. 郯庐断裂带昌邑北段隐伏活动断层探测[J]. 地质论评, 67(S1): 28-30.
	CAI Ming-gang, LU Ren-qi, SU Peng, et al. 2021. Detection of the hidden active fault in the northern Changyi segment of the Tanlu fault zone[J]. Geological Review, 67(S1): 28-30. (in Chinese)
[2]	曹筠, 冉勇康, 许汉刚, 等. 2018. 郯庐断裂带江苏段安丘-莒县断裂全新世活动及其构造意义[J]. 地球物理学报, 61(7): 2828-2844.
	CAO Jun, RAN Yong-kang, XU Han-gang, et al. 2018. Holocene activity of the Anqiu-Juxian Fault on the Jiangsu segment of the Tanlu fault zone and its tectonics implication[J]. Chinese Journal of Geophysics, 61(7): 2828-2844. (in Chinese)
[3]	柴炽章, 孟广魁, 杜鹏, 等. 2006. 隐伏活动断层的多层次综合探测: 以银川隐伏活动断层为例[J]. 地震地质, 28(4): 536-544.
	CHAI Chi-zhang, MENG Guang-kui, DU Peng, et al. 2006. Comprehensive multi-level exploration of buried active fault: An example of Yinchuan buried active fault[J]. Seismology and Geology, 28(4): 536-544. (in Chinese)
[4]	晁洪太, 李家灵, 崔昭文, 等. 1994a. 郯庐断裂带中段全新世活断层的特征滑动行为与特征地震[J]. 内陆地震, 8(4): 297-304.
	CHAO Hong-tai, LI Jia-ling, CUI Zhao-wen, et al. 1994a. Characteristic slip behavior of the Holocene fault in the central section of the Tanlu fault zone and the characteristic earthquakes[J]. Inland Earthquake, 8(4): 297-304. (in Chinese)
[5]	晁洪太, 李家灵, 崔昭文, 等. 1994b. 郯庐断裂带中段全新世活断层的几何结构与分段[M]//国家地震局地质研究所编. 活动断裂研究(3). 北京: 地震出版社:180-190.
	CHAO Hong-tai, LI Jia-ling, CUI Zhao-wen, et al. 1994b. Geometry and segmentation of the Quaternary fault in the middle segment of the Tanlu fault zone[M]//Institute of Geology, China Earthquake Administration. Research of Active Fault (3). Seismological Press, Beijing: 180-190. (in Chinese)
[6]	晁洪太, 王志才, 王雷, 等. 2018. 发震断裂带内黏土矿物的纳微米变形[J]. 地球科学, 43(5): 1746-1754.
	CHAO Hong-tai, WANG Zhi-cai, WANG Lei, et al. 2018. Nano/micro-scale deformation of clay minerals in seismogenic fault zone[J]. Earth Science, 43(5): 1746-1754. (in Chinese)
[7]	邓起东, 徐锡伟, 张先康, 等. 2003. 城市活动断层探测的方法和技术[J]. 地学前缘, 10(1): 150-162.
	DENG Qi-dong, XU Xi-wei, ZHANG Xian-kang, et al. 2003. Methods and techniques for surveying and prospecting active faults in urban areas[J]. Earth Science Frontiers, 10(1): 150-162. (in Chinese)
[8]	高维明, 李家灵, 孙竹友. 1980. 沂沭大陆裂谷的生成与演化[J]. 地震地质, 2(3): 11-18.
	GAO Wei-ming, LI Jia-ling, SUN Zhu-you. 1980. Development and evolution of the Yishu rift[J]. Seismology and Geology, 2(3): 11-18. (in Chinese)
[9]	高维明, 郑郞荪, 李家灵, 等. 1988. 1668年山东郯城8.5级地震的发震构造[J]. 中国地震, 4(3): 9-15.
	GAO Wei-ming, ZHENG Lang-sun, LI Jia-ling, et al. 1988. Seismogenic structure of the 1668 Tancheng M_S8.5 earthquake in Shandong[J]. Earthquake Research in China, 4(3): 9-15. (in Chinese)
[10]	计昊旻, 李安, 张世民. 2021. 基于冲沟右旋水平位错的安丘-莒县断裂地震特征位移分析[J]. 地震地质, 43(3): 471-487. doi: 10.3969/j.issn.0253-4967.2021.03.001. DOI
	JI Hao-min, LI An, ZHANG Shi-min. 2021. Analysis on the seismic characteristic displacement of Anqiu-Juxian Fault based on dextral horizontal dislocation of gully[J]. Seismology and Geology, 43(3): 471-487. (in Chinese)
[11]	雷启云, 柴炽章, 杜鹏, 等. 2011. 基于钻探的芦花台隐伏断层晚第四纪活动特征[J]. 地震地质, 33(3): 602-614. doi: 10.3969/j.issn.0253-4967.2011.03.010. DOI
	LEI Qi-yun, CHAI Chi-zhang, DU Peng, et al. 2011. Activity characteristics of Luhuatai buried fault since late Quaternary revealed by drilling[J]. Seismology and Geology, 33(3): 602-614. (in Chinese)
[12]	李家灵, 晁洪太, 崔昭文, 等. 1994. 1668年郯城8¹/₂级地震断层及其破裂机制[J]. 地震地质, 16(3): 230-237.
	LI Jia-ling, CHAO Hong-tai, CUI Zhao-wen, et al. 1994. Earthquake fault and its rupture mechanism of the 1668 Tancheng M=8¹/₂ earthquake[J]. Seismology and Geology, 16(3): 230-237. (in Chinese)
[13]	李康, 徐锡伟, 魏雷鸣, 等. 2019. 1668年郯城地震断层的长发震间隔与低速率证据[J]. 科学通报, 66(11): 1168-1178.
	LI Kang, XU Xi-wei, WEI Lei-ming, et al. 2019. Evidence of long recurrence times and low slip rate along the 1668 Tancheng earthquake fault[J]. Chinese Science Bulletin, 66(11): 1168-1178. (in Chinese)
[14]	李善邦. 1981. 中国地震[M]. 北京: 地震出版社:1-612.
	LI Shan-bang. 1981. Earthquakes in China[M]. Seismological Press, Beijing: 1-612. (in Chinese)
[15]	秦晶晶, 刘保金, 许汉刚, 等. 2020. 地震折射和反射方法研究郯庐断裂带宿迁段的浅部构造特征[J]. 地球物理学报, 63(2): 505-516.
	QIN Jing-jing, LIU Bao-jin, XU Han-gang, et al. 2020. Exploration of shallow structural characteristics in the Suqian segment of the Tanlu fault zone based on seismic refraction and reflection method[J]. Chinese Journal of Geophysics, 63(2): 505-516. (in Chinese)
[16]	宋方敏, 杨晓平, 何宏林, 等. 2005. 山东安丘-莒县断裂小店子-茅埠段新活动及其定量研究[J]. 地震地质, 27(2): 200-211.
	SONG Fang-min, YANG Xiao-ping, HE Hong-lin, et al. 2005. Quantitative seismology and recent activity of the Xiaodianzi-Maobu segment of the Aqiu-Juxian Fault, Shandong Province[J]. Seismology and Geology, 27(2): 200-211. (in Chinese)
[17]	王雷. 2016. 活动断裂带断层泥纳微米尺度的特征研究[D]. 廊坊: 防灾科技学院:1-69.
	WANG Lei. 2016. Research on the characteristics of active fault gouges at the nano/micro scale[D]. Institute of Disaster Prevention, Langfang: 1-69. (in Chinese)
[18]	王志才, 贾荣光, 孙昭民, 等. 2005. 沂沭断裂带安丘-莒县断裂安丘-朱里段几何结构与活动特征[J]. 地震地质, 27(2): 212-220.
	WANG Zhi-cai, JIA Rong-guang, SUN Zhao-min, et al. 2005. Geometry and activity of the Anqiu-Zhuli segment of the Anqiu-Juxian Fault in the Yishu fault zone[J]. Seismology and Geology, 27(2): 212-220. (in Chinese)
[19]	王志才, 王冬雷, 许洪泰, 等. 2015. 安丘-莒县断裂北段几何结构与最新活动特征[J]. 地震地质, 37(1): 176-191. doi: 10.3969/j.issn.0253-4967.2015.01.014. DOI
	WANG Zhi-cai, WANG Dong-lei, XU Hong-tai, et al. 2015. Geometric features and latest activities of the north segment of the Anqiu-Juxian Fault[J]. Seismology and Geology, 37(1): 176-191. (in Chinese)
[20]	许汉刚, 范小平, 冉勇康, 等. 2016. 郯庐断裂带宿迁段F₅断裂浅层地震勘探新证据[J]. 地震地质, 38(1): 31-43. doi: 10.3969/j.issn.0253-4967.2016.01.003. DOI
	XU Han-gang, FAN Xiao-ping, RAN Yong-kang, et al. 2016. New evidences of the Holocene fault in Suqian segment of the Tanlu fault zone discovered by shallow seismic exploration method[J]. Seismology and Geology, 38(1): 31-43. (in Chinese)
[21]	徐嘉炜, 朱光. 1995. 中国东部郯庐断裂带构造模式讨论[J]. 华北地质矿产杂志, 10(2): 121-134.
	XU Jia-wei, ZHU Guang. 1995. Discussion on tectonic models for the Tan-Lu fault zone, eastern China[J]. Journal of Geology and Mineral Resources North China, 10(2): 121-134. (in Chinese)
[22]	徐建国, 徐华, 张涛, 等. 2019. 沂沭断裂带北段东支断裂的浅部构造特征及活动性[J]. 地质学报, 93(4): 776-790.
	XU Jian-guo, XU Hua, ZHANG Tao, et al. 2019. Shallow tectonic characteristics and activity of the east branch faults of the northern segment of the Yishu fault zone[J]. Acta Geologica Sinica, 93(4): 776-790. (in Chinese) DOI URL
[23]	杨源源, 赵朋, 郑海刚, 等. 2017. 郯庐断裂带安徽紫阳山段发现全新世活动证据[J]. 地震地质, 39(4): 644-655. doi: 10.3969/j.issn.0253-4967.2017.04.002. DOI
	YANG Yuan-yuan, ZHAO Peng, ZHENG Hai-gang, et al. 2017. Evidence of Holocene activity discovered in Anhui Zhiyangshan segment of Tanlu fault zone[J]. Seismology and Geology, 39(4): 644-655. (in Chinese)
[24]	张鹏, 张媛媛, 李丽梅, 等. 2019. 郯庐断裂带安丘-莒县断裂江苏段全新世活动的新证据[J]. 地震地质, 41(3): 576-586. doi: 10.3969/j.issn.0253-4967.2019.03.003. DOI
	ZHANG Peng, ZHANG Yuan-yuan, LI Li-mei, et al. 2019. New evidences of Holocene activity in the Jiangsu segment of Anqiu-Juxian Fault of the Tanlu fault zone[J]. Seismology and Geology, 41(3): 576-586. (in Chinese)
[25]	郑朗荪, 高维明, 郑传贝. 1988. 郯庐断裂带的分段与沂沭断裂的活动性[J]. 中国地震, 4(3): 123-129.
	ZHENG Lang-sun, GAO Wei-ming, ZHENG Chuan-bei. 1988. Characteristics of various segments in the Tanlu zone and activities of the Yishu Fault[J]. Earthquake Research in China, 4(3): 123-129. (in Chinese)
[26]	朱光, 王道轩, 刘国生, 等. 2004. 郯庐断裂带的演化及其对西太平洋板块运动的响应[J]. 地质科学, 39(1): 36-49.
	ZHU Guang, WANG Dao-xuan, LIU Guo-sheng, et al. 2004. Evolution of the Tan-Lu fault zone and its responses to plate movements in west Pacific Basin[J]. Chinese Journal of Geology, 39(1): 36-49. (in Chinese)
[27]	朱书俊, 孙寿成. 1991. 1668年莒县-郯城大震研究综述[J]. 地震学刊, 11(4): 19-24.
	ZHU Shu-jun, SUN Shou-cheng. 1991. Reviews on researches on 1668 Juxian-Tancheng great earthquake[J]. Journal of Seismology, 11(4): 19-24. (in Chinese)
[28]	Jiang W L, Zhang J F, Han Z J, et al. 2017. Characteristic slip of strong earthquakes along the Yishu fault zone in East China evidenced by offset landforms[J]. Tectonics, 36(10): 1947-1965. DOI URL