浙江南部丽水盆地地层时代及构造演化

马之力; 李建华; 张岳桥; 董树文; 宋传中; 李勇

浙江南部丽水盆地地层时代及构造演化

1. 中国地质科学院地质力学研究所, 北京 100081;
2. 合肥工业大学资源与环境科学系, 安徽合肥 230009

基金项目:

中国地质调查局地质调查项目(12120115069501)

国家自然科学基金项目(41502197)

中国地质科学院地质力学研究所基本科研业务项目(DZLXJK201403)和国家专项"深部探测与实验研究"(SinoProbe-08-01)联合资助。

详细信息

作者简介:
马之力,男,1989年生,硕士生,矿物学、岩石学、矿床学专业;E-mail:mzl7777@163.com。

通讯作者:
张岳桥,男,1963年生,研究员,博士生导师,从事构造地质、盆地分析和活动构造研究工作

中图分类号: P597.3;P553;P534.53
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出版历程
- 收稿日期: 2014-12-05
- 修回日期: 2015-03-08
- 网络出版日期: 2023-09-25
- 刊出日期: 2016-02-24

Geochronological and structural constraints on the litho-stratigraphic units of the Lishui Basin, southeastern China

1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
2. School of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China

Funds:

Supported by China Geological Survy Program(No. 12120115069501), National Natural Science Foundation of China (No. 41502197), Institute of Geomechanics, Chinese Academy of Geological Sciences Basic Scientific Research Program (No. DZLXJK201403) and National Science and Technology Major Project "Deep Exploration and Research"(No. SinoProbe-08-01).

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摘要

摘要: 位于浙江南部的丽水盆地是华南东部典型的白垩纪火山岩盆地。对盆地中5个凝灰岩夹层样品进行了锆石LA-MC-ICPMS U-Pb同位素年代学分析,结果给出了(114±1) Ma, (114±2) Ma,(118±1) Ma, (122±1) Ma和(112±1)Ma的主体谐和年龄。结合区域沉积-构造接触关系,本文将盆地内火山-沉积序列分为上、下2个组合:下火山-沉积组合包括馆头组和朝川组,其形成时代在124~112 Ma;上火山-沉积组合以方岩组为代表,其时代在104~91 Ma。这两套岩石组合的形成记录了盆地两期伸展断陷事件。结合区域构造变形和古构造应力场反演结果,本文认为丽水盆地早白垩世经历了两个伸展-挤压旋回的构造演化过程,每一旋回的古构造应力场均以NW-SE伸展和NWSE挤压应力场的交替演化为特征。NW-SE伸展事件控制了盆地的初始张开、断陷和沉积物充填作用,其产生的动力背景与古太平洋板块俯冲过程中因俯冲板片后撤(roll-back)诱发的弧后扩张作用有关。NW-SE挤压事件导致盆地的构造反转,下白垩统普遍褶皱,并形成区域角度不整合面,其形成与俯冲板片的深部几何学变化或大陆碰撞的远程效应有关。丽水盆地伸展-挤压事件的幕式交替反映了弧后扩张过程中复杂的深部动力学背景。
- 丽水盆地 /
- 锆石U-Pb /
- 华南 /
- 白垩纪 /
- 构造应力场
Abstract: The Lishui Basin is a typical Cretaceous volcanic basin developed in Zhejiang Province of southeastern China. Five rock samples collected from interbedded volcanic tuffs of this basin were analyzed by using LA-MC-ICPMS zircon U-Pb method, which yielded weighted mean ²⁰⁶Pb/²³⁸U ages of (114±1) Ma, (114±2) Ma, (118±1) Ma, (122±1) Ma and (112±1) Ma, respectively.These dating results, in conjunction with regional sedimentary and structural contact relationships, led the authors to divide the volcano-sedimentary sequences into two rock suites:the lower rock suite, consisting of Guantou and Chaochuan Formations, was deposited in 124-112 Ma, whereas the upper rock suite, corresponding to Chaochuan Formation, was deposited in 104-91 Ma. Their generations resulted from two stages of crustal extensional events during the Early Cretaceous. These sedimentary data, coupled with structural analysis and tectonic stress field inversion, support the argument that the Lishui basin underwent two cycles of tectonic evolution, and each was dominated by alternate stress episodes of NW-SE extension and NW-SE compression. The NW-SE extension accommodated the initial opening and sediment infilling of the basin, which might have originated from the back-arc extension induced by the rollback of the subducted Paleo-Pacific slab during the Early Cretaceous. The NW-SE compression led to tectonic inversion, and was responsible for the unconformity between the Upper and Lower Cretaceous strata, which was probably associated with the variations of the subducted slab dynamics or the collision between the eastern Asian margin and the West Philippine Block. The alternate extensional and compressional episodes reflect variation of geometries and dynamics of subducted slab in a back-arc extensional setting.
- Lishui Basin /
- zircon U-Pb /
- southeastern China /
- Cretaceous /
- tectonic stress field

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图 1 华南大陆白垩纪盆地、岩浆岩和断裂分布简图

Figure 1. Simplified geological map showing the distribution of Cretaceous basins, magmatic rocks and faults of South China

下载: 全尺寸图片幻灯片

图 2 华南东部浙江省白垩纪火山岩盆地、岩浆和断裂分布简图

Figure 2. Simplified structural map showing the distribution of volcanic basins, magmatic rocks and faults in Zhejiang Province of southeast China

下载: 全尺寸图片幻灯片

图 3 丽水盆地构造刚要图和古构造应力场反演结果(A)、横穿丽水盆地构造剖面(B)及四期构造应力场主应力轴极密值统计图(C)

Figure 3. (A) Simplified geological map of the Lishui basin, and computed stress axes from fault slip analyses showing alternate extensional and compressional regimes prevailing during basin formation and development; (B) Cross section based on field observations and measurements showing structural styles of the Lishui basin; (C) Stereonet showing statistical analyses of three principal stress axes and yielding four stages of tectonic stress field.σ1,σ2, and σ3 represent maximum, intermediate and minimum compressive stress, respectively

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图 4 丽水盆地野外地层岩性组成及构造变形照片

A—老竹地堑馆头组砂泥岩；B—老竹地堑朝川组流纹岩；C—老竹地堑朝川组球泡流纹岩；D—老竹地堑方岩组砾岩；E—岩寨地堑地层陡立

Figure 4. Field views showing lithological compositions and structures of the strata in the Lishui Basin

A-Guantou sandstone and mudstone, Laozhu graben; B-Chaochuan rhyolite, Laozhu graben; C-Chaochuan globular rhyolite, Laozhu graben; D-Fangyan conglomerate, Laozhu graben; E-Steep-dipping volcano-sedimentary strata, Yanzhai graben

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图 5 老竹、碧湖和岩寨地堑地层柱状对比分析图

Figure 5. Representative stratigraphic columns showing the petrology, thickness and geochronology of major rock series in the Laozhu, Bihu and Yanzhai grabens

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图 6 丽水盆地夹层凝灰岩锆石阴极发光图像和LA-MC-ICPMS锆石U-Pb年龄谐和图

Figure 6. Cathodoluminescence (CL) images and zircon U-Pb concordia diagrams of the volcanic rocks within Lishui basin. MSWD, mean square of weighted deviates

下载: 全尺寸图片幻灯片

图 7 华南东部白垩纪火山岩盆地地层柱状对比图

Figure 7. Regional comparisons between stratigraphic columns of the Lishui, Yongkang, Shengzhou, Tiantai and Qinqu basins in eastern South China

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图 8 丽水盆地野外构造变形照片

A—盆地内正断层（F₁，F₂）产状与地层（S₀）产状; B,C,D—断层面上发育的擦痕（箭头指向代表对盘运动方向）

Figure 8. Field views showing structure styles of the Lishui Basin

A-Field view of the NE-trending normal faults (F₁,F₂) and the attitude of strata (S₀) in the Lishui basin; B,C,D-Field view of the striations on faults (the arrows point to the direction of the other side of the fault)

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表 1 丽水盆地火山岩锆石LA-MC-ICPMS分析数据

Table 1 LA-MC-ICPMS zircon U-Pb isotopic data of zircons form the volcanic rocks within the Lishui basin

点号	Th/10^-6	U/10^-6	Pb*/10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb*/²³⁵U	1σ	²⁰⁶Pb*/²³⁸U	1σ	²⁰⁶Pb/²³⁸U年龄/Ma
WYS08-1 岩寨地堑凝灰岩
wys08.1	403	211	4.2	1.909	0.0508	0.0383	0.1235	0.0764	0.0176	0.0002	113±1.3
wys08.2	126	151	2.4	0.835	0.0593	0.0042	0.1442	0.0104	0.0176	0.0002	113±1.5
wys08.3	102	130	2.3	0.787	0.0488	0.0040	0.1251	0.0103	0.0186	0.0003	119±1.8
wys08.4	159	142	2.5	1.120	0.0485	0.0045	0.1202	0.0113	0.0180	0.0003	115±1.7
wys08.5	225	174	2.9	1.287	0.0497	0.0024	0.1225	0.0061	0.0179	0.0002	114±1.5
wys08.6	235	170	2.9	1.382	0.0516	0.0036	0.1273	0.0088	0.0179	0.0002	114±1.5
wys08.7	162	144	2.4	1.130	0.0647	0.0037	0.1643	0.0095	0.0184	0.0002	118±1.6
wys08.8	83	104	1.8	0.793	0.0545	0.0068	0.1354	0.0168	0.0180	0.0003	115±1.7
wys08.9	190	149	2.4	1.272	0.0566	0.0034	0.1379	0.0085	0.0177	0.0002	113±1.5
wys08.10	244	199	3.2	1.222	0.0575	0.0033	0.1362	0.0079	0.0172	0.0002	110±1.4
wys08.ll	172	178	3.0	0.969	0.0525	0.0045	0.1246	0.0105	0.0172	0.0002	110±1.4
wys08.12	212	188	3.0	1.127	0.0623	0.0029	0.1493	0.0075	0.0174	0.0002	111±1.5
wys08.13	129	135	2.2	0.953	0.0629	0.0042	0.1559	0.0106	0.0180	0.0003	115±1.8
wys08.14	133	125	2.1	1.067	0.0675	0.0047	0.1704	0.0126	0.0183	0.0003	117±2.1
wys08.15	189	181	3.1	1.047	0.0509	0.0038	0.1243	0.0094	0.0177	0.0002	113±1.5
wys08.16	127	126	2.2	1.009	0.0682	0.0044	0.1739	0.0118	0.0185	0.0003	118±2.0
wys08.17	193	159	2.7	1.216	0.0696	0.0074	0.1789	0.0192	0.0186	0.0004	119±2.5
wys08.18	410	383	6.2	1.069	0.0500	0.0019	0.1222	0.0048	0.0177	0.0002	113±1.3
WYS 09-1 岩寨地堑凝灰岩
wys09.1	102	132	2.2	0.775	0.0689	0.0033	0.1715	0.0086	0.0180	0.0002	115±1.6
wys09.2	85	110	1.8	0.771	0.0616	0.0052	0.1528	0.0127	0.0180	0.0003	115±1.8
wys09.3	329	265	4.5	1.243	0.0495	0.0022	0.1201	0.0056	0.0176	0.0002	112±1.3
wys09.4	136	157	2.7	0.866	0.0842	0.0036	0.2125	0.0095	0.0183	0.0002	117±1.5
wys09.5	114	132	2.1	0.863	0.0522	0.0035	0.1265	0.0087	0.0176	0.0002	112±1.5
wys09.6	119	141	2.5	0.842	0.1093	0.0050	0.2738	0.0121	0.0182	0.0003	116±1.7
wys09.7	129	146	2.4	0.886	0.0689	0.0030	0.1693	0.0077	0.0178	0.0003	114±1.6
wys09.8	104	126	2.1	0.826	0.0491	0.0042	0.1222	0.0105	0.0181	0.0003	115±1.6
wys09.9	164	144	2.4	1.139	0.0716	0.0042	0.1768	0.0109	0.0179	0.0002	114±1.5
wys09.10	126	124	2.2	1.013	0.0728	0.0047	0.1890	0.0127	0.0188	0.0003	120±1.7
wys09.ll	171	151	2.4	1.134	0.0503	0.0028	0.1228	0.0069	0.0177	0.0002	113±1.5
wys09.12	207	166	2.7	1.243	0.0653	0.0029	0.1566	0.0073	0.0174	0.0002	111±1.3
ZJ66 老竹地堑凝灰岩
zj66.1	57	66	1.2	0.859	0.0490	0.0029	0.1215	0.0073	0.0180	0.0003	115±1.7
zj66.2	51	73	1.5	0.697	0.0485	0.0069	0.1263	0.0158	0.0189	0.0003	120±1.8
zj66.3	44	65	1.4	0.675	0.0502	0.0064	0.1313	0.0164	0.0190	0.0003	121±1.9
zj66.4	46	84	1.6	0.543	0.0491	0.0046	0.1227	0.0115	0.0181	0.0002	116±1.5
zj66.5	46	58	1.2	0.795	0.0509	0.0044	0.1322	0.0112	0.0188	0.0003	120±2.2
zj66.6	65	81	1.5	0.797	0.0492	0.0018	0.1248	0.0046	0.0184	0.0002	117±1.5
zj66.7	40	63	1.2	0.633	0.0503	0.0048	0.1286	0.0117	0.0186	0.0003	119±1.8
zj66.8	37	62	1.1	0.588	0.0517	0.0069	0.1292	0.0171	0.0181	0.0003	116±2.0
zj66.9	62	84	1.6	0.734	0.0484	0.0057	0.1216	0.0141	0.0182	0.0003	116±1.6
zj66.10	44	78	1.5	0.567	0.0498	0.0059	0.1267	0.0147	0.0185	0.0002	118±1.6
zj66.ll	76	91	1.8	0.834	0.0492	0.0040	0.1268	0.0102	0.0187	0.0002	119±1.5
zj66.12	28	52	0.9	0.540	0.0493	0.0030	0.1265	0.0075	0.0186	0.0003	119±2.1
zj66.13	31	61	1.2	0.514	0.0488	0.0053	0.1298	0.0136	0.0193	0.0003	123±2.0
zj66.14	37	63	1.2	0.596	0.0491	0.0080	0.1288	0.0204	0.0190	0.0003	122±1.9
zj66.15	47	67	1.1	0.704	0.0484	0.0037	0.1216	0.0096	0.0182	0.0003	116±2.2
zj66.16	50	66	1.2	0.768	0.0494	0.0055	0.1272	0.0141	0.0187	0.0003	119±2.0
zj66.17	69	80	1.4	0.862	0.0486	0.0043	0.1212	0.0106	0.0181	0.0003	115±1.9
zj66.18	62	73	1.4	0.851	0.0494	0.0055	0.1251	0.0135	0.0183	0.0003	117±1.6
zj66.19	42	60	1.0	0.706	0.0622	0.0055	0.1564	0.0140	0.0182	0.0004	117±2.2
zj66.20	51	64	1.1	0.791	0.0487	0.0053	0.1192	0.0128	0.0177	0.0003	113±1.7
zj66.21	82	95	1.9	0.866	0.0499	0.0114	0.1290	0.0283	0.0187	0.0002	120±1.5
zj66.22	61	64	1.2	0.942	0.0497	0.0068	0.1261	0.0167	0.0184	0.0004	118±2.5
ZJ90 岩寨地堑凝灰岩
zj90.1	51	46	1.3	1.1154	0.0541	0.0075	0.1462	0.0240	0.0196	0.0007	125±4.2
zj90.2	173	190	4.5	0.9059	0.0530	0.0036	0.1373	0.0098	0.0188	0.0003	120±1.7
zj90.3	158	142	3.6	1.1122	0.0489	0.0026	0.1285	0.0080	0.0191	0.0003	122±1.9
zj90.4	146	148	4.1	0.9827	0.0488	0.0023	0.1337	0.0077	0.0199	0.0003	127±2.0
zj90.5	181	162	3.9	1.1185	0.0554	0.0019	0.1427	0.0056	0.0187	0.0002	119±1.2
zj90.6	208	223	5.2	0.9330	0.0527	0.0013	0.1340	0.0038	0.0184	0.0002	118±1.5
zj90.7	196	238	5.5	0.8244	0.0537	0.0015	0.1381	0.0045	0.0186	0.0002	119±1.2
zj90.8	144	118	3.5	1.2283	0.0503	0.0038	0.1410	0.0132	0.0203	0.0003	130±1.9
zj90.9	165	161	4.2	1.0248	0.0510	0.0017	0.1347	0.0050	0.0191	0.0003	122±1.8
zj90.10	340	150	4.7	2.2688	0.0564	0.0033	0.1450	0.0095	0.0187	0.0003	119±1.8
zj90.ll	239	237	6.7	1.0063	0.0441	0.0014	0.1221	0.0055	0.0201	0.0003	128±1.9
zj90.12	244	191	4.9	1.2776	0.0500	0.0026	0.1284	0.0076	0.0186	0.0002	119±1.5
zj90.13	329	132	3.9	2.4927	0.0487	0.0023	0.1277	0.0069	0.0190	0.0002	121±1.6
zj90.14	111	69	2.1	1.6055	0.0538	0.0044	0.1413	0.0130	0.0190	0.0004	122±2.6
zj90.15	287	248	6.9	1.1551	0.0448	0.0030	0.1229	0.0104	0.0199	0.0004	127±2.6
zj90.16	52	110	2.6	0.4710	0.0481	0.0031	0.1336	0.0097	0.0202	0.0004	129±2.7
zj90.17	207	197	4.8	1.0509	0.0564	0.0015	0.1457	0.0044	0.0187	0.0002	120±1.1
zj90.18	234	203	5.2	1.1555	0.0462	0.0018	0.1207	0.0054	0.0189	0.0002	121±1.2
zj90.19	139	130	3.2	1.0691	0.0483	0.0031	0.1258	0.0091	0.0189	0.0003	121±1.7
zi90.20	107	128	2.9	0.8395	0.0518	0.0023	0.1357	0.0065	0.0190	0.0002	121±1.6
zj90.21	658	255	8.0	2.5841	0.0527	0.0015	0.1356	0.0045	0.0187	0.0002	119±1.2
zj90.22	261	224	6.4	1.1667	0.0511	0.0026	0.1409	0.0121	0.0200	0.0004	128±2.5
zj90.23	178	194	4.8	0.9183	0.0513	0.0020	0.1339	0.0061	0.0189	0.0002	121±1.2
zj90.24	171	145	4.2	1.1803	0.0472	0.0022	0.1305	0.0071	0.0200	0.0002	128±1.3
zj90.25	256	229	5.3	1.1179	0.0501	0.0014	0.1310	0.0040	0.0190	0.0002	121±1.5
zj90.26	91	66	2.5	1.3748	0.0506	0.0049	0.1408	0.0199	0.0202	0.0006	129±3.5
zj90.27	101	101	2.9	0.9952	0.0499	0.0033	0.1382	0.0117	0.0201	0.0004	128±2.7
zj90.28	241	99	3.3	2.4450	0.0452	0.0036	0.1251	0.0116	0.0201	0.0004	128±2.3
zj90.29	323	226	6.7	1.4320	0.0483	0.0013	0.1343	0.0050	0.0202	0.0003	129±1.7
zj90.30	131	132	3.7	0.9927	0.0447	0.0024	0.1244	0.0081	0.0202	0.0003	129±1.9
ZJ93 岩寨地堑凝灰岩
ZJ93.1	1093	506	8.9	2.162	0.0496	0.0011	0.1175	0.0028	0.0172	0.0002	110±1.1
ZJ93.2	443	376	6.6	1.179	0.0498	0.0020	0.1214	0.0051	0.0177	0.0002	113±1.1
ZJ93.3	791	426	7.8	1.857	0.0489	0.0015	0.1158	0.0036	0.0172	0.0002	110±1.1
zj93.4	560	360	6.2	1.556	0.0497	0.0017	0.1176	0.0043	0.0172	0.0002	110±1.1
zj93.5	503	424	7.5	1.184	0.0485	0.0020	0.1156	0.0052	0.0173	0.0002	110±1.1
ZJ93.6	430	310	5.7	1.386	0.0493	0.0026	0.1190	0.0065	0.0175	0.0002	112±1.1
zj93.7	383	333	6.2	1.150	0.0489	0.0033	0.1199	0.0080	0.0178	0.0002	114±1.1
zj93.8	536	523	9.4	1.025	0.0498	0.0016	0.1213	0.0041	0.0177	0.0002	113±1.1
zj93.9	470	415	7.1	1.132	0.0486	0.0017	0.1187	0.0044	0.0177	0.0002	113±1.1
zj93.10	517	440	7.4	1.177	0.0495	0.0016	0.1197	0.0043	0.0175	0.0002	112±1.1
zj93.ll	469	395	7.1	1.189	0.0494	0.0020	0.1207	0.0050	0.0177	0.0002	113±1.1
zj93.12	410	356	5.7	1.151	0.0532	0.0018	0.1283	0.0050	0.0175	0.0002	112±1.2
zj93.13	287	336	6.2	0.855	0.0494	0.0039	0.1219	0.0097	0.0179	0.0002	114±1.2
zj93.14	555	467	8.8	1.188	0.0491	0.0019	0.1189	0.0047	0.0176	0.0002	112±1.1
zj93.15	1133	552	11.0	2.054	0.0509	0.0017	0.1209	0.0041	0.0172	0.0002	110±1.1
zj93.16	313	203	3.9	1.540	0.0494	0.0031	0.1222	0.0076	0.0179	0.0002	115±1.4
zi93.17	323	292	4.9	1.107	0.0495	0.0015	0.1189	0.0038	0.0174	0.0002	111±1.1
注：Pb*表示放射性铅；普通铅校正采用²⁰⁸Pb校正法。

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表 2 丽水盆地断层滑动矢量与构造应力场反演结果

Table 2 Results of fault-slip analysis and calculated stress fields dominating the formation and development of the Lishui Basin

位置	岩性	擦痕数	σ1(az/pl)	σ2(az/pl)	σ3(az/pl)	R=(σ2-σ1)/(σ3-σ1)	构造应力场
Zj89b2	砂岩（永康群）	5	255745°	105740°	2715°	0.87	NE-SW挤压
Zj99c	火山岩（早白垩世）	19	82728°	227756°	343716°	0.655
ZjlOlb	砾岩（永康群）	11	259714°	358732°	148753°	0.873
Zjl02b2	火山岩（早白垩世）	5	264°2°	5778°	174710°	0.383
Zj91b	砂岩（永康群）	8	51784°	28273°	19274°	0.83	N-S伸展
Zj94	火山岩（早白垩世）	16	355778°	9672°	186711°	0.496
Zj95b	砂岩（永康群）	5	46751°	31471°	222738°	0.455
Zj97b	火山岩（早白垩世）	6	157777°	26874°	359711°	0.496
Zj99b	火山岩（早白垩世）	5	8777°	25774°	166711°	0.141
ZjlOO	粉砂岩（永康群）	5	169777°	27072°	1712°	0.558
ZjlOla	砾岩（永康群）	7	184773°	8872°	357716°	0.676
Zj90	火山岩（早白垩世）	6	14379°	27769°	236718°	0.823	MW—SE挤压
Zj95a	砂岩（永康群）	6	141719°	349768°	23479°	0.968
Zj97a	火山岩（早白垩世）	9	31370°	44714°	220775°	0.716
Zj99a	火山岩（早白垩世）	15	12072°	215761°	28728°	0.725
Zjl02a	火山岩（早白垩世）	6	134742°	340744°	237713°	0.875
Zj4	砾岩（永康群）	4	62759°	262728°	16778°	0.622	NW-SE伸展
Zj89a	砂岩（永康群）	5	91769°	19775°	289719°	0.388
Zj91a	砂岩（永康群）	6	85762°	292724°	191711°	0.847
Zj92	火山岩（早白垩世）	5	114771°	22276°	314717°	0.525
Zj96	泥岩（永康群）	7	81764°	226721°	322713°	0.683
注：σ1、σ2、σ3分别表示最大、中间和最小主应力轴方位；az、pl分别表示倾伏向、倾伏角。

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