幕阜山岩体北缘鄂南地区构造特征与构造控矿作用

林子晗; 夏元; 张航川; 徐先兵

doi:10.19509/j.cnki.dzkq.tb20230525

幕阜山岩体北缘鄂南地区构造特征与构造控矿作用

doi: 10.19509/j.cnki.dzkq.tb20230525

1.
中国地质大学（武汉）地球科学学院，武汉 430074
2.
湖北省地质局第四地质大队，湖北咸宁 437100

基金项目: 湖北省自然科学基金联合基金项目（2023AFD229）

详细信息

作者简介:
林子晗：E-mail：linzihan@cug.edu.cn

通讯作者:
E-mail：xbxu2011@cug.edu.cn

中图分类号: P612; P542
计量
- 文章访问数: 182
- PDF下载量: 33
- 被引次数: 0
出版历程
- 收稿日期: 2023-09-12
- 录用日期: 2024-03-28
- 修回日期: 2024-03-20
- 网络出版日期: 2024-03-29

Structural features of the southern Hubei Province along the northern of the Mufushan pluton structural ore-controlling of polymetallic deposits

1.
School of Earth Sciences, China University of Geosciences (Wuhan), Wuhan 430074, China
2.
Fourth Geological Brigade, Hubei Provincial Geological Bureau, Xianning Hubei 437100, China

More Information

Author Bio:
E-mail：linzihan@cug.edu.cn

Corresponding author: E-mail：xbxu2011@cug.edu.cn

摘要

摘要:
江南造山带中段幕阜山地区发育规模巨大的早白垩世Li-Be-Cs-Nb-Ta等稀有金属和Pb-Zn-Cu-Au-Sb等有色金属岩浆−热液成矿系统。幕阜山岩体南、北缘的湘东北和鄂南地区具有相同的成矿物质基础，但现有矿产勘探成果差距明显，可能是构造变形差异所致。本研究通过构造解析、古应力场反演以及矿床分布规律，探讨了鄂南地区的构造控矿作用。构造解析表明E-W走向江南断裂形成于新元古代，保存了三叠纪由S向N的逆冲作用、晚白垩世断层上盘向SE的正断作用和古近纪E-W走向左行剪切作用；而NE-SW走向长坪断裂形成于中侏罗世燕山运动，记录了早白垩世晚期左行走滑、晚白垩世正断作用和古近纪晚期右行走滑。基于断层滑移矢量反演的古应力场揭示鄂南地区经历了早白垩世晚期走滑（近N-S向最大主应力）、晚白垩世NW-SE走向伸展、古近纪早期走滑（NE-SW向最大主应力）和古近纪中−晚期NE-SW走向伸展的应力场演化历史。结合研究区的金属矿床分布特征，认为鄂南地区NE-SW走向主干断裂的次级近平行断裂或与其相交的NW-SE走向和近E-W走向断裂具有较好的金属矿产勘探潜力。
- 幕阜山岩体 /
- 构造变形 /
- 古应力场 /
- 构造控矿作用 /
- 江南造山带 /
- 鄂南地区
Abstract: Objective
An intensive Early Cretaceous magmatic-hydrothermal metallogenic system developed in the Mufushan area of the central Jingnan Orogen. This orogenic belt in the South China Block formed through the accretion and subsequent collision of the Yangtze and Cathaysia blocks during the early Neoproterozoic, resulting in the formation of rare metal deposits (Li-Be-Cs-Nb-Ta) and nonferrous metal deposits (Pb-Zn-Cu-Au-Sb).
Methods
This study investigates the structural control of polymetallic deposits in southern Hubei Province utilizing structural analysis, paleostress inversions of fault-slip data, and the spatial distribution of polymetallic ore deposits.
Results
Structural analysis revealed that the Jiangnan fault, striking E-W and originating in the Neoproterozoic, exhibits Triassic top-to-the-north thrusting, Late Cretaceous oblique normal faulting, and Paleogene left-lateral strike-slip motion. The NE-striking Changping fault, formed during the Middle Jurassic Yanshanian orogeny, shows evidence of late Early Cretaceous left-lateral strike-slip motion, late Cretaceous normal faulting, and late Paleogene right-lateral strike-slip motion. Paleostress inversions indicate that southern Hubei Province experienced a series of paleostress fields, including a strike-slip stress field (with maximum principal stress oriented N-S and minimum principal stress oriented N-S) during the late Early Cretaceous, an NW-SE extensional stress field during the late Cretaceous, another strike-slip stress field (with maximum principal stress oriented NE-SW and minimum principal stress oriented N-S) during the early Paleogene, and a NE-SW extensional stress field during the late Paleogene.
Conclusion
Based on the polymetallic deposits in the study area, we conclude that secondary faults subparallel to the primary NE-SW trending fault, along with NW-SE and E-W trending faults intersecting with the primary NE-SW fault, present substantial potential for polymetallic mineral exploration.
- Mufushan pluton /
- structural deformation /
- paleostress field /
- structural ore-controlling of polymetallic deposit /
- Jiangnan Orogen /
- southernHubei Province

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图 1 幕阜山岩体北缘鄂南地区地质简图

F1. 江南断裂；F2. 长坪断裂；F3. 宝林断裂；F4. 孟城断裂；F5. 桃林断裂；F6. 赵李桥断裂；F7. 麻颈断裂；金属矿床中绿色代表锂矿床，青色代表铌钽矿床，黄色代表金矿床，粉色代表锑矿床；Nh-Z. 成冰系−震旦系；Pt₃L. 青白口系冷家溪群；∈. 寒武系；O. 奥陶系；S. 志留系；K₂-E. 上白垩统−古近系；下同

Figure 1. Geological sketch map of the southern Hubei Province, northern margin of Mufushan pluton

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图 2 幕阜山岩体北缘鄂南地区遥感解译图（底图来自谷歌地球）

Figure 2. Remote sensing interpretation map of the southern Hubei Province, northern margin of the Mufushan pluton

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图 3 江南断裂野外露头素描与野外照片

a. 江南断裂野外露头素描；b. 层序倒转的碳质页岩；c. 层序倒转的长石石英砂岩；d. 层序倒转的长石石英砂岩与沿层面侵入的石英脉；e. 层序正常的冷家溪群粉砂质板岩；f. 层序正常的砂砾岩；g. 石英砂岩中发育的E-W走向左行走滑断层；h. 志留系和上白垩统至古近系呈正断层接触；i. 志留系中发育的E-W走向正断层；S₀. 岩层产状；F. 断层面；L. 擦痕线理；K₂-E. 上白垩统−古近系；S₂. 中志留统

Figure 3. Sketch and field photographs of outcrops along the Jiangnan fault

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图 4 长坪断裂野外露头素描与野外照片

a. 长坪断裂野外露头素描；b. 断层上盘上白垩统至古近系紫红色砾岩；c. 断层泥；d. 上覆上白垩统至古近系紫红色砾岩与下伏寒武系灰岩呈断层接触；e. 断层下盘寒武系灰岩；f. 寒武系灰岩层面上发育的阶步和擦痕指示正断作用；g. 寒武系灰岩层面上发育的阶步和擦痕指示正断作用；h. 寒武系灰岩层面上发育的阶步和擦痕指示右行剪切；i. 上覆上白垩统至古近系紫红色砾岩与下伏寒武系灰岩呈断层接触；j. 寒武系灰岩中白云岩旋转碎斑指示左行走滑；k. 上覆上白垩统至古近系紫红色砾岩与下伏寒武系灰岩呈断层接触

Figure 4. Sketch and field photographs of outcrops along the Changping fault

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图 5 幕阜山岩体北缘鄂南地区不同岩层产状的赤平投影(等面积下半球)

a. 冷家溪群岩层的产状及其计算的褶皱枢纽；b. 成冰系至志留系岩层的产状及其计算的褶皱枢纽；c. 上白垩统至古近系岩层（黑色）及其中断层（红色）的产状

Figure 5. Stereonet projections of attitudinal from various layers in the southern Hubei Province, northern margin of the Mufushan pluton (equal area, lower hemisphere)

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图 6 幕阜山岩体北缘鄂南地区露头褶皱的野外照片

a. 近E-W走向褶皱；b. 近E-W走向褶皱；c. 近E-W走向褶皱；d. 近N-S走向逆断层活动形成的NE-SW走向褶皱；e. 近E-W走向逆断层活动形成的NW-SE走向褶皱；f. NNE走向逆断层活动形成的NE-SW走向褶皱

Figure 6. Field photographs of outcrop folds in the southern Hubei Province, northern margin of the Mufushan pluton

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图 7 幕阜山岩体北缘鄂南地区构造应力场反演

a. 第一期走滑应力场，N-S向水平的最大主应力，E-W向水平的最小主应力；b，c. 第二期NW-SE向伸展应力场，NW-SE向水平的最小主应力，中间主应力直立；d，e，f，g，h. 第三期走滑应力场，NE-SW向水平的最大主应力，NW-SE向水平的最小主应力；i，j，k. 第四期NE-SW向伸展应力场，NE-SE向水平的最小主应力，中间主应力直立；Schmidt Lower. 施密特网下半球投影；Weighting. 权重；n. 数据个数；S1. 最大主应力轴方位；S2. 中间主应力轴方位；S3. 最小主应力轴方位；R. 应力比；Function. 函数；QRw. WSM（世界地应力图）定义的质量等级；QRt. TENSOR程序中定义的质量等级；QRw. 世界应力图WSM规定的质量登记；QRt. 应力反演程序Win_Tensor规定的质量等级

Figure 7. Paleostress inversions in the southern Hubei Province, northern margin of the Mufushan pluton

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表 1 幕阜山岩体北缘鄂南地区用于应力场反演的断层滑移矢量数据

Table 1. Fault-slip data for stress inversion analysis in the southern Hubei Province, northern margin of the Mufushan pluton

观测点	MFS-15					MFS-16					MFS-37
编号	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学
1	305	88	032	44	S	197	26	135	13	N	188	44	138	32	N
2	300	79	018	46	S	165	68	153	68	N	180	80	145	78	N
3	124	88	034	12	S	168	39	155	38	N	185	68	156	65	N
4	131	89	042	30	S	166	79	165	79	N	165	64	143	62	N
5	235	89	145	18	D	185	63	142	55	N	170	60	149	58	N
6						190	82	142	78	N	170	59	144	56	N
7											166	69	149	68	N
8											165	69	148	68	N
观测点	MFS-03					MFS-07					MFS-10
编号	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学
1	195	54	113	11	S	220	54	292	23	S	002	74	278	19	S
2	193	70	110	16	S	230	51	141	01	S	010	69	286	16	S
3	198	71	111	10	S	230	61	303	28	S	000	86	090	10	S
4	200	63	115	09	S	205	59	290	07	S	000	73	275	14	S
5	200	64	118	16	S	217	52	297	13	S	010	79	283	15	S
6	173	72	084	04	S	220	49	296	16	S	005	89	275	07	S
7	180	74	093	09	S	210	58	290	16	S	000	90	270	05	S
8						210	33	293	05	S	355	71	073	30	S
9						235	73	323	07	S	356	90	266	10	S
观测点	MFS-11					MFS-17					MFS-27
编号	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学
1	345	61	073	04	S	263	75	263	75	I	225	44	187	37	N
2	350	63	262	04	S	077	62	077	62	I	217	37	220	37	N
3	340	63	255	09	S	075	38	075	38	I	220	48	206	47	N
4	350	66	076	08	S	073	45	073	45	I	214	40	221	40	N
5	353	70	265	05	S	086	52	086	52	I
观测点	MFS-31					MFS-32
编号	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学	倾向/(°)	倾角/(°)	倾伏向/(°)	倾伏角/(°)	运动学
1	157	56	56	229	D	022	88	022	88	N
2	143	35	35	217	N	034	65	034	65	N
3	165	41	41	236	N	015	65	015	65	N
4	140	46	46	227	D	034	46	034	46	N
5	170	49	49	247	D	036	60	036	60	N
注：N，I，S，D分别代表正断层，逆断层，左行平移断层和右行平移断层

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表 2 幕阜山岩体北缘鄂南地区早白垩世晚期至古近纪应力场

Table 2. Paleostress fields from Late Early Cretaceous to Paleogene in the southern Hubei Province, northern margin of the Mufushan pluton

观测点	地层时代	数据个数	主应力轴方位(倾伏向/倾伏角)			主应力相对大小R	应力场期次	应力场形成时代
观测点	地层时代	数据个数	S1	S2	S3	主应力相对大小R	应力场期次	应力场形成时代
MFS-15	寒武纪	5	351/15	230/62	088/23	0.56	第一期	早白垩世晚期
MFS-16	寒武纪	6	048/81	251/08	161/03	0.50	第二期	晚白垩世
MFS-37	志留纪	8	0.19/68	256/11	164/18	0.50	第二期	晚白垩世
MFS-03	成冰纪	7	0.61/24	221/65	328/08	0.50	第三期	古近纪中期
MFS-07	拉伸纪	9	0.85/15	193/52	344/35	0.49	第三期	古近纪中期
MFS-10	成冰纪	9	224/10	345/71	131/16	0.42	第三期	古近纪中期
MFS-11	成冰纪	5	216/19	350/65	120/17	0.50	第三期	古近纪中期
MFS-17	成冰纪	5	259/02	169/00	085/88	0.50	第三期	古近纪中期
MFS-27	埃迪卡拉纪	4	158/83	303/06	034/04	0.52	第四期	古近纪晚期
MFS-31	寒武纪	5	272/42	128/42	020/20	0.50	第四期	古近纪晚期
MFS-32	寒武纪	5	205/70	118/00	029/20	0.50	第四期	古近纪晚期

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