小秦岭地区矿田构造深部探测初步认识

doi:10.11720/wtyht.2020.0075

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Abstract

According to the measured gravity data and wide-area magnetotelluric sounding study as well as the seismic section and borehole data, the authors investigated the deep structure of Xiaoqingling area. It is considered that the buried depths at 1 500 m, 2 500 m and 3 500 m of Taihua Group in Xiaoqingling area are important tectonic interfaces, especially at 1 500 m, which may limit the emplacement of most quartz vein orebodies. The intersection of the S-dipping and N-dipping resistivity of the grid magnetotelluric profile at 1 500~2 500 m may indicate the formation of large-scale gold orebodies. The fault structure of Xunmadao is complex, and its upper plate may be dominated by structural schist and rifting rocks. The Yanshanian intrusive rock mass may exist at the depth of 3 500 m, which has the prospect of finding quarz vein-type gold deposits and the conditions for forming tectonic alteration rock-type gold deposits. The Taiyao fault dips northward in the stepladder form. Within the range of 1.5~3 km to the north, the underlying Quaternary Taihua Group is buried at the depth of 800~1 500 m. The fault is wide in the west and narrow in the east. The deep prospecting in this area should pay attention to the recognition of the complex structural features of the electrical structure on both sides of the middle and western sections of the Xunmadao fault.

Key words： Xiaoqinling area structure of orefield deep detection

Received: 17 February 2020 Published: 28 August 2020

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	Articles by authors
	Xiang-Guang ZHENG
	Lin LU
	Hui-Yi LIU
	Xiao-Long LIU
	Kun XU
	Zhi-Lin ZHANG

Cite this article:

Xiang-Guang ZHENG,Lin LU,Hui-Yi LIU, et al. The preliminary understanding of deep structure exploration n the orefield of Xiaoqinling area[J]. Geophysical and Geochemical Exploration, 2020, 44(4): 894-904.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.0075 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I4/894

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1—Quaternary;2—Tertiary;3—Xunjiansi formation of Jixian system;4—Gaoshanhe formation of Changcheng system;5—the second upper subgroup of the Taihua group;6—the first upper subgroup of the Taihua group;7—the middle subgroup of the Taihua group;8—the under subgroup of the Taihua group;9—biotite monzonitic granite;10—quartz syenite porphyry;11—middle-grain biotite monzonitic granite;12—fine-grain monzonitic granite;13—Proterozoic basic veins;14—granite pegmatite;15—Archaic basic veins;16—Archaean granite
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Geological sketch in Xiaoqinling area^[5]
1—Quaternary;2—Tertiary;3—Xunjiansi formation of Jixian system;4—Gaoshanhe formation of Changcheng system;5—the second upper subgroup of the Taihua group;6—the first upper subgroup of the Taihua group;7—the middle subgroup of the Taihua group;8—the under subgroup of the Taihua group;9—biotite monzonitic granite;10—quartz syenite porphyry;11—middle-grain biotite monzonitic granite;12—fine-grain monzonitic granite;13—Proterozoic basic veins;14—granite pegmatite;15—Archaic basic veins;16—Archaean granite

Geological structure sketch in Xiaoqinling area
1—the upper subgroup of the Taihua group;2—the under subgroup of the Taihua group;3—granites in Yanshanian period;4—granites in Jinningian period;5—contamination phase on the top;6—barren or weak mineralized zone;7—strong mineralized zone;8—weak mineralized zone;9—regional fault;10—minor fault;11—anticline;12—syncline;13—gold deposits

地质单元	代号	样本数	均值/(g·cm^-3)	众数/(g·cm^-3)	最小值/(g·cm^-3)	最大值/(g·cm^-3)
全区		1687	2.73	2.63	2.45	3.16
蓟县系巡检司组	Jx	79	2.82	2.85	2.63	2.88
长城系高山河组	Chg	108	2.67	2.63	2.52	2.82
太华群上亚群二段	Art $h 3 b$	317	2.75	2.69	2.55	3.13
太华群上亚群一段	Art $h 3 a$	484	2.79	2.73	2.49	3.12
太华群中亚群	Arth₂	101	2.67	2.63	2.52	3.08
太华群下亚群	Arth₁	134	2.8	2.63	2.57	3.16
华山岩体	K₁ηγβ	59	2.61	2.6	2.49	2.73
文峪岩体	K₁ηγβ	36	2.61	2.61	2.51	2.65
晋宁期二长花岗岩	Pt₂ηγβ	120	2.59	2.59	2.45	2.74
熊耳期二长花岗岩	Pt₁ηγβ	45	2.59	2.58	2.51	2.7
酸性岩脉	Pt₁γρ	126	2.6	2.59	2.51	2.7
基性岩脉	Pt₁N、ArN	69	2.89	2.88	2.67	3.09

Density stastics of geological units

Density color-blocks zone map in Xiaoqinling area
1—Quaternary;2—Tertiary;3—Xunjiansi formation of Jixian system;4—Gaoshanhe formation of Changcheng system;5—the second upper subgroup of the Taihua group;6—the first upper subgroup of the Taihua group;7—the middle subgroup of the Taihua group;8—the under subgroup of the Taihua group;9—monzonitic granite;10—quartz syenite porphyry;11—middle-grain biotite monzonitic granite;12—fine-grain monzonitic granite;13—Proterozoic basic veins;14—granite pegmatite;15—Archaic basic veins;16—Archaean granite;17—magnetotelluric sounding profile and stratum code;18—number of specimens collected;19—average density and range(g·cm^-3);20—seismic section;21—boreholes and their numbering

Statistical results of density of physical specimens in Xiaoqinling area

地质单元	代号	样本数	均值/(Ω·m)	众数/(Ω·m)	最小值/(Ω·m)	最大值/(Ω·m)
全区		1687	3925	4476	7	59729
蓟县系巡检司组	Jx	79	4776	2161	169	47144
长城系高山河组	Chg	108	7931	4387	237	57012
太华群上亚群二段	Art $h 3 b$	317	3072	1885	36	41192
太华群上亚群一段	Art $h 3 a$	484	3584	4347	7	36136
太华群中亚群	Arth₂	101	5938	12652	250	46950
太华群下亚群	Arth₁	134	3790	3059	101	19274
华山岩体	K₁ηγβ	59	2714	3820	33	9486
文峪岩体	K₁ηγβ	36	1743	2068	137	4488
晋宁期二长花岗岩	Pt₂ηγβ	120	2570	2037	109	16673
熊耳期二长花岗岩	Pt₁ηγβ	45	1873	2474	181	6425
酸性岩脉	Pt₁γρ	126	2855	549	139	23047
基性岩脉	Pt₁N、ArN	69	9285	4477	164	59729

Geological units specimen resistivity parameter characteristic statistics table

地质单元	代号	样本数	均值/(10^-64π·SI)	众数/(10^-64π·SI)	最小值/(10^-64π·SI)	最大值/(10^-64π·SI)
全区		1687	1616	11.5	0.2	34994
蓟县系巡检司组	Jx	79	11.23	11.5	1.4	137.1
长城系高山河组	Chg	108	73.96	6	0.2	2493
太华群上亚群二段	Art $h 3 b$	317	2109	104	6.3	34980
太华群上亚群一段	Art $h 3 a$	484	1968	338	4.1	28417
太华群中亚群	Arth₂	101	1606	3172	5.9	32493
太华群下亚群	Arth₁	134	2327	12.9	3.5	34994
华山岩体	K₁ηγβ	59	2652	1136	17.5	4666
文峪岩体	K₁ηγβ	36	2608	1456	928.7	4084
晋宁期二长花岗岩	Pt₂ηγβ	120	827	13.5	2	5516
熊耳期二长花岗岩	Pt₁ηγβ	45	531	8.4	6	5466
酸性岩脉	Pt₁γρ	126	807	7.5	1	10123
基性岩脉	Pt₁N、ArN	69	1786	118	44.2	11959

Geological units specimen magnetic susceptibility parameter characteristic statistics table

1∶50000 Bouguer gravity anomaly diagram in Xiaoqinling area

1∶50000 residual bouguer gravity anomaly map

Aeromagnetic polarized anomaly diagram(revised according to reference[15])

5]
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Trend graph of burst temperature of gold-bearing quartz veins^[5]

Schematic of inversion resistivity of P1,P2 and P3 profiles

Comprehensive geological interpretation map in Xiaoqinling area
1—Quaternary;2—Tertiary;3—Xunjiansi formation of Jixian system;4—Gaoshanhe formation of Changcheng system;5—the second upper subgroup of the Taihua group;6—the first upper subgroup of the Taihua group;7—Jinning adamellite;8—Xiongerian adamellite;9—inferred Yanshanian intrusive rocks;10—regional faults;11—speculated concealed structure;12—presumed fracture;13—stratigraphic boundary;14—geological bulk density(g/cm³) and resistivity(Ω·m)

Seismic profile of Taihua formation in Taiyu of Xiaoqinling area

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