安丘-莒县断裂驸马营覆盖区第四纪活动特征

doi:10.3969/j.issn.0253-4967.2022.05.005

地震地质 ›› 2022, Vol. 44 ›› Issue (5): 1156-1171.DOI: 10.3969/j.issn.0253-4967.2022.05.005

安丘-莒县断裂驸马营覆盖区第四纪活动特征

王雷¹⁾^,²⁾^,³⁾(), 许洪泰¹⁾^,³⁾^,^*(), 王志才¹⁾, 杨传成¹⁾^,³⁾, 张建民¹⁾^,³⁾, 王冬雷¹⁾^,³⁾, 夏暖¹⁾^,³⁾, 蔡明刚²⁾, 鲁人齐²⁾, 任治坤²⁾

1)山东省地震局, 济南 250014
2)中国地震局地质研究所, 北京 100029
3)山东省震灾风险防治中心, 济南 250021

收稿日期:2021-07-20 修回日期:2021-10-11 出版日期:2022-10-20 发布日期:2022-11-28
通讯作者: 许洪泰
作者简介:
王雷, 男, 1988年生, 2016年于防灾科技学院获地质工程专业硕士学位, 工程师, 主要从事地震地质方向和纳米构造方向的研究, E-mail: wangleifz0421@qq.com。
基金资助:
山东省地震局一般科研项目(YB2106); 国家自然科学基金(41574066); 中国地震局地质研究所基本科研业务专项(IGCEA1602); 安丘-莒县活动断层(潍坊段)综合探测与地震灾害风险评估项目共同资助

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

WANG Lei¹⁾^,²⁾^,³⁾(), XU Hong-tai¹⁾^,³⁾(), WANG Zhi-cai¹⁾, YANG Chuan-cheng¹⁾^,³⁾, ZHANG Jian-min¹⁾^,³⁾, WANG Dong-lei¹⁾^,³⁾, XIA Nuan¹⁾^,³⁾, CAI Ming-gang²⁾, LU Ren-qi²⁾, REN Zhi-kun²⁾

1) Shandong Earthquake Agency, Jinan 250014, China
2) Institute of Geology, China Earthquake Administration, Beijing 100029, China
3) Earthquake Risk Prevention and Control Center of Shandong Province, Jinan 250021, China

Received:2021-07-20 Revised:2021-10-11 Online:2022-10-20 Published:2022-11-28
Contact: XU Hong-tai

摘要/Abstract

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

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

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.

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.

图/表 9

图1 潍坊段沂沭断裂带及邻区的地质图 a 郯庐断裂带潍坊-嘉山段展布示意图(修改自晁洪太等, 1994a); Ⅰ 安丘段; Ⅱ 莒县-郯城段; Ⅲ 新沂-泗洪段。b 沂沭断裂带潍坊段分布图; F1昌邑-大店断裂; F2白芬子-浮来山断裂; F3沂水-汤头断裂; F4鄌郚-葛沟断裂;F5-1安丘-莒县断裂西支; F5-2安丘-莒县断裂东支

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

图2 驸马营地区的断裂展布

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

图3 安丘-莒县断裂露头地质剖面 a 眉村镇西庄子断裂剖面(修改自王志才等, 2005); b 九龙社区双官埠村断裂剖面(修改自王志才等, 2005);c 朱里镇国道北侧断裂剖面; d 穆村镇穆村西冲沟Ⅱ级阶地断层及古地震剖面①(①中国地震局地质研究所,2006,安丘-莒县、昌邑-大店断裂活动性调查总结报告。)

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

图4 安丘-莒县断裂眉村镇北的浅层地震(L1)剖面 a 跨安丘-莒县断裂和昌邑-大店断裂的剖面; b 图a中b处的局部放大; c 眉村镇北安丘-莒县断裂的地质解译剖面。T01上更新统底界; TQ第四系与基岩的分界面; T1、 T2、 T3 基岩中的界面

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

图5 安丘-莒县断裂的浅层地震(L2)剖面 a 测线时间剖面; b 地质解译剖面。TQ 第四系与基岩分界面; T1、 T2、 T3、 T4 基岩中的界面

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

图6 安丘-莒县断裂驸马营浅层地震(L3)剖面 a 跨安丘-莒县断裂东支的剖面; b 图a中b处的局部放大; c 驸马营覆盖区安丘-莒县断裂东支的地质解译剖面。T01上更新统底界; T02中更新统底界; TQ 第四系与基岩的分界面; T1基岩中的界面; Qh+ Q P 3 上更新统-全新统; Q P 2 中更新统; Q P 1 下更新统; K 白垩系

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

图7 安丘-莒县断裂驸马营钻孔联合探测剖面 a 联合钻孔剖面; b 钻孔Z4与Z5的岩心柱照片

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

表1 驸马营钻孔联合剖面光释光(OSL)样品的测年结果

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

图8 安丘-莒县断裂驸马营探槽剖面 a 探槽北壁; b 驸马营探槽全貌; c 图a中c处的局部放大, 团块状黏土混杂在粉砂层中; d 图e中d处的局部放大, 柱状黏土进入粉砂层中; e 探槽南壁; f 图e中f处的局部放大, U8底部落差为0.6m。U1耕作土; U2土黄色粉土层; U3浅黄色粉土层; U4褐黄色粉质黏土, 局部内含粉土夹层, 厚2~3cm; U5浅黄色粉土, 厚10~15cm; U6褐黄色粉质黏土, 上部含条带状粉土夹层; U7褐色粉质黏土, 内部含粉土夹层; U8黑色淤泥层, 内部可见植物腐烂根系及贝壳; U9黄色粉土-粉细砂层; U10黑灰色黏土层

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

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安丘-莒县断裂驸马营覆盖区第四纪活动特征

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

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