南秦岭安康汉中地区岩石物性特征及应用

doi:10.11720/wtyht.2022.1476

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Abstract

Physical property parameters are the link between geophysics and geology and are crucial to the rational inversion of geophysical interpretation and inference. To systematically grasp the physical properties of rocks (minerals) in Hanzhong and Ankang areas to the south of the Qinling Mountains, improve interpretation accuracy, and serve basic geological research and the surveys and evaluation of mineral resources, this study collected 458 physical property points of rocks, 13 740 pieces of susceptibility data, and 458 sets of energy spectrum data in the hinterland of the Hanzhong and Ankang areas at the southern foot of the Qinling Mountains. Then, this study classified and made statistics of the physical properties of rocks. The results of magnetic susceptibility data show that the Paleoproterozoic basic and partial intermediate rock masses are ferromagnetic geological bodies in the study area, with an average magnetic susceptibility of greater than 4 000×10^-5SI, and gabbro has the highest magnetic susceptibility; the dominant magnetic strata in the area are the Paleoproterozoic Xixiang Group and the tuff in the Sinian Yaolinghe Formation, which have average magnetic susceptibility of mostly close to 1 000×10^-5SI, and the high magnetic susceptibility can reach more than 2 000×10^-5SI. According to laboratory testing, most of the magnetic geological bodies in the study area have induced magnetism, and a few tuffs, gabbros, and magnetite-bearing gabbros in the study area have strong remanence, which must be considered in the anomaly inversion. The physical property analysis based on energy spectrum parameters shows that the Paleozoic and Sinian metamorphic rocks in the study area have high radioactivity and highly variable content, among which black rocks (carbonaceous) generally have high radioactivity. As indicated by two examples of western Miaoba Village and the southeastern Shiquan County, magnetic, radioactive, and physical-property parameters are important for the interpretation of magnetic and radioactive data, and they establish a link between aerial magnetic and radioactive information and geological information, improving the reliability of interpretation.

Key words： southern Qinling Mountain physical parameters magnetic susceptibility remanence energy spectrum parameters

Received: 24 August 2021 Published: 03 January 2023

ZTFLH:

P631

Corresponding Authors: ZHU Wei-Ping E-mail: xvluping@126.com;zwpagrs@126.com

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	Lu-Ping XU
	Wei-Ping ZHU
	Hong-Wei ZHU
	Jiao-Jiao LI
	Ming WANG
	Qi-Fang ZHENG

Cite this article:

Lu-Ping XU,Wei-Ping ZHU,Hong-Wei ZHU, et al. Physical property characteristics of rocks in Hanzhong and Ankang areas at the southern foot of Qinling Mountains and their application[J]. Geophysical and Geochemical Exploration, 2022, 46(5): 1167-1179.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1476 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I5/1167

Geological map and physical property point distribution map of Ankang and Hanzhong area, South Qinling
a—1:250,000 geological map of Ankang and Hanzhong area; b—schematic diagram of physical property(k) collection points and magnetic susceptibility;c—schematic diagram of physical property collection points and total radioactive content(tot)

Statistic table of measured magnetic susceptibility

年代	代号	岩性	测点数	磁化率/(10^-5SI)			序号
年代	代号	岩性	测点数	最小值	最大值	平均值	序号
中生代	γ $ρ 5 1 - b$	白云母伟晶花岗岩、伟晶花岗岩	11	1	166	24	22
	$γ 5 1 - b$	黑云母花岗岩	8	4	111	30	23
	$γ 51$	花岗岩	3	3	108	34	24
古生代	γδ₃	花岗闪长岩	13	3	128	42	25
古生代	δ₃	闪长岩	3	21	315	56	26
元古代	γ $δ 2 1 - 4$	花岗闪长岩	15	1	1455	148	27
	$γ 2 1 - 6$	黑云母花岗岩	6	24	3821	336	28
		花岗岩	9	10	4505	448	29
		斑状花岗岩	6	14	1253	176	30
	$γ 2 1 - 5$	斑状花岗岩	6	24	1712	404	31
		黑云母花岗岩	24	12	1631	198	32
		花岗岩	9	2	1506	187	33
	$ν 2 1 - 2$	辉长岩	9	25	60600	10497	34
	$N 2 1 - 1$	辉长岩	19	24	37266	3277	35
		角闪辉长岩	2	76	8232	2388	36
		角闪辉长辉绿岩	8	5	8035	1213	37
		闪长岩	6	10	16618	1995	38
	ρ	白云母伟晶花岗岩脉	3	2	108	20	39
	γ	黑云母花岗岩、细粒花岗岩脉	2	2	619	171	40

Statistical table of magnetic susceptibility measured in intrusive rocks

序号	地层	岩性	磁化率检测/ (10^-5SI)	剩磁强度/ (A·m^-1)	剩磁偏角/(°)	剩磁倾角/(°)	Q值
1	Pt₁xx	凝灰岩	6840	0.9083	46	52	0.32
2	$N 2 1 - 1$	辉长岩	1430	0.5755	245	-70	0.97
3	$N 2 1 - 1$	花岗闪长岩	610	0.1094	11	67	0.43
4	$N 2 1 - 1$	辉长岩	1890	4.634	273	88	5.93
5	$N 2 1 - 1$	辉长岩	4110	1.128	257	80	0.66
6	$γ 2 1 - 5$	角闪花岗岩	890	0.0484	2	58	0.13
7	$N 2 1 - 1$	辉长岩	3930	0.2803	343	41	0.17
8	$N 2 1 - 1$	辉长岩	2520	0.1396	328	76	0.13
9	Pt₁xx	凝灰岩	2420	0.348	51	66	0.35
10	$N 2 1 - 1$	辉长岩	12900	0.3694	81	69	0.07
11	$ν 2 1 - 2$	辉长岩	2280	0.4059	212	59	0.43
12	$γ 2 1 - 6$	花岗岩	1190	0.1459	164	79	0.3
13	$ν 2 1 - 2$	辉长岩	3980	0.4394	2	82	0.27
14	$ν 2 1 - 2$	含磁铁辉长岩	55200	32.47	107	64	1.42
15	Z_ayl	*	1380	0.0353	354	-15	0.06
16	$N 2 1 - 1$	辉长岩	14000	2.318	92	72	0.4
17	$N 2 1 - 1$	辉长岩	4240	0.6672	86	-56	0.38
18	$N 2 1 - 1$	辉长岩	2620	0.09968	348	36	0.09
19	$N 2 1 - 1$	辉长岩	2150	0.01432	90	-66	0.02
20	$N 2 1 - 1$	辉长岩	1400	0.128	40	29	0.22
21	$N 2 1 - 1$	辉长岩	3050	0.3562	61	47	0.28
22	$N 2 1 - 1$	云母石英片岩	1160	0.1295	25	59	0.27
23	$N 2 1 - 1$	花岗岩	5150	0.426	32	18	0.2
24	$N 2 1 - 1$	辉长岩	3770	1.416	252	70	0.91
25	$N 2 1 - 1$	闪长岩	2540	0.249	288	51	0.24
26	$N 2 1 - 1$	辉长岩	4740	0.245	80	70	0.12
27	$γ 2 1 - 6$	辉长岩	5150	1.359	348	62	0.64
28	$N 2 1 - 1$	辉长岩	5360	0.2302	303	52	0.1
29	$γ 2 1 - 6$	辉长岩	9960	0.2873	290	74	0.07
30	Pt₁xx	变质砂岩	750	0.08663	9	51	0.28
序号	地层	岩性	磁化率检测/ (10^-5SI)	剩磁强度/ (A·m^-1)	剩磁偏角/(°)	剩磁倾角/(°)	Q值
31	Pt₁xx	变质砂岩	3740	0.4297	348	48	0.28
32	Pt₁xx	变质砂岩	1300	0.1597	48	67	0.3
33	Pt₁xx	变质砂岩	3580	1.115	321	65	0.75
34	Pt₁xx	变质砂岩	160	0.001403	358	38	0.02
35	Z_ayl	凝灰岩	2010	0.1642	41	61	0.2
36	Z_ayx	凝灰岩	1440	15.34	29	42	25.74
37	Z_ayl	凝灰岩	6750	0.1062	13	45	0.04
38	Z_ayx	石英斑岩	1260	0.6802	45	22	1.3
39	Z_ayx	凝灰岩	1070	0.2552	348	60	0.58
40	Pt₁xx	黑云母角闪片麻岩	4560	0.1579	7	-18	0.08
41	Pt₁xx	含铁石英岩	5090	0.8785	211	61	0.42
42	*	片麻状花岗岩	1520	0.2373	58	-57	0.38
43	*	辉长岩	910	0.09316	9	61	0.25
44	*	辉长岩	4560	0.2133	74	29	0.11
45	*	辉长岩	5760	0.2787	35	11	0.12

Magnetic parameters measured to samples

Table 1 and Table 2)
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Statistic diagram of magnetic susceptibility of measured strata and magmatic rocks (the serial numbers in the figure correspond to Table 1 and Table 2)

地层		岩性	测点数	w(K)/10^-2	w(U)/10^-6	w(Th)/10^-6	序号
系	代号	岩性	测点数	常见范围/平均值	常见范围/平均值	常见范围/平均值	序号
第四系	Q	土壤、风化残坡积物	2	(0.41~2.07)/1.24	(1.15~3.16)/2.16	(2.09~14.19)/8.14	1
古近系	E	泥岩、砂岩、砂砾岩、砾岩	2	(2.01~2.53)/2.27	(1.42~5.18)/2.79	(12.2~13.38)/12.79	2
侏罗系— 三叠系	J~T	粉砂岩、灰岩、泥质灰岩	10	(0.36~2.53)/0.94	(0.19~3.4)/2.92	(1.74~19.28)/8.46	3
二叠系	P	灰岩、硅质灰岩	4	(0.06~1.53)/0.66	(1.42~4.14)/3.01	(0.49~4.33)/2.14	4
石炭系	C_2-3	大理岩、灰岩、片岩、千枚岩	14	(0.40~6.03)/2.25	(0.94~12.57)/4.91	(1.69~48.79)/15.91	5
	C₁l	云母石英片岩	17	(2.41~5.53)/3.91	(1.92~6.41)/3.42	(7.19~25.05)/18.11	6
	C₁	灰岩	3	(0.15~2.11)/0.84	(1.46~3.26)/2.27	(0.48~5.06)/2.38	7
泥盆系	D₃p	灰岩	4	(0.29~1.88)/0.81	(0.72~5.31)/2.88	(1.78~10.80)/4.71	8
	D₃p	炭质片岩	4	(2.31~3.13)/2.82	(3.19~15.70)/11.83	(12.53~19.33)/14.65	9
	D₂d	灰岩、千枚岩	8	(0.43~4.40)/2.18	(0.94~3.57)/1.91	(2.42~22.40)/10.09	10
	D₂gn	钙质片岩、灰岩	5	(2.04~3.72)/2.77	(2.31~5.11)/3.62	(15.38~25.89)/19.24	11
	D₂h	灰岩、片岩	20	(0.61~4.42)/2.71	(1.16~36.55)/5.00	(3.43~25.50)/15.04	12
志留系	S	变质砂岩、二云母片岩	13	(1.74~7.68)/4.02	(3.91~19.28)/9.8	(8.47~52.95)/21.88	13
志留系	S	(炭质)云母石英片岩	31	(0.48~5.49)/3.85	(1.76~16.31)/5.06	(3.06~25.79)/18.89	14
奥陶系	O_b	变质石英砂岩、石英片岩	21	(0.52~4.62)/2.14	(3.98~62.57)/18.56	(1.86~21.23)/8.41	15
	O	变质砂岩、灰岩	18	(0.48~4.85)/2.75	(1.41~45.62)/18.32	(3.91~23.12)/12.06	16
		炭质石英片岩	7	(0.53~4.93)/2.49	(2.42~41.31)/15.03	(3.46~19.98)/10.60	17
		云母石英片岩	5	(1.31~5.17)/3.80	(4.04~5.33)/4.76	(3.28~23.74)/18.08	18
寒武系— 奥陶系	(∈- O)dh	灰岩、砂岩	4	(0.35~3.12)/1.86	(1.35~26.09)/11.33	(2.05~12.48)/7.09	19
		炭质片岩	6	(0.65~3.74)/2.06	(2.67~21.04)/11.04	(5.72~13.30)/9.27	20
		钙质片岩、(二)云母石英片岩	12	(0.76~4.83)/2.55	(1.29~17.61)/5.00	(2.78~22.88)/11.28	21
寒武系	∈_2-3	黑色砂岩、砂岩	11	(1.43~5.98)/3.08	(2.15~22.96)/9.05	(7.79~18.87)/13.87	22
		石英片岩	6	(2.83~4.20)/3.58	(6.48~15.59)/10.71	(11.45~18.15)/16.31	23
		炭质石英片岩	16	(1.21~5.57)/4.26	(2.14~72.08)/9.84	(6.50~25.48)/20.54	24
		云母石英片岩	23	(0.68~5.20)/3.87	(2.24~9.92)/4.02	(6.53~25.47)/18.95	25
	∈₁	灰岩、千枚岩、炭质板岩、砂岩	7	(0.44~4.11)/1.36	(1.43~45.03)/8.32	(1.97~13.51)/5.62	26
震旦系	Z_ayl	凝灰岩、片岩	22	(0.19~7.17)/2.20	(0.88~8.44)/2.84	(1.26~15.89)/6.81	27
	Z_ayx	黑云母片岩	4	(1.44~3.99)/2.28	(0.89~2.75)/1.49	(1.54~14.03)/6.72	28
		流纹斑岩、石英斑岩	12	(0.38~5.66)/2.49	(0.82~3.63)/2.01	(0.83~17.51)/7.71	29
		石英片岩	4	(1.49~7.23)/3.60	(0.70~4.05)/2.25	(3.58~12.41)/8.20	30
古元古界	Pt₁xx	凝灰质砂砾岩、变质砂岩、片岩、黑云母角闪片麻岩	21	(0.62~3.96)/2.19	(0.24~3.23)/1.66	(1.02~16.63)/7.6	31
		玄武岩	5	(0.72~2.48)/1.39	(0.57~2.32)/1.57	(1.87~6.87)/4.68	32
		流纹质、玄武质晶屑凝灰岩	2	(1.99~4.76)/3.38	(1.48~3.28)/2.38	(4.86~14.58)/9.72	33

Statistic table of measured radioactive parameters of the formation

年代	代号	岩性	测点数	w(K)/10^-2	w(U)/10^-6	w(Th)/10^-6	序号
年代	代号	岩性	测点数	常见范围/平均值	常见范围/平均值	常见范围/平均值	序号
中生代	γ $ρ 5 1 - b$	白云母伟晶花岗岩、伟晶花岗岩	14	(2.81~7.43)/5.29	(2.01~26.43)/8.19	(2.76~24.72)/7.39	34
	$γ 5 1 - b$	黑云母花岗岩	8	(2.07~6.74)/4.22	(0.76~3.78)/2.65	(6.56~21.90)/12.16	35
	γ₅₁	花岗岩	3	(2.73~5.44)/4.20	(1.34~1.85)/1.58	(8.93~18.07)/13.12	36
古生代	γδ₃	花岗闪长岩	13	(2.26~4.66)/3.32	(0.96~4.08)/2.38	(4.46~15.13)/9.71	37
古生代	δ₃	闪长岩	3	(2.74~17.10)/7.63	(1.30~4.22)/2.77	(2.31~11.87)/7.04	38
元古代	γ $δ 2 1 - 4$	花岗闪长岩	15	(0.68~5.74)/2.57	(0.30~2.04)/1.32	(0.49~16.47)/7.09	39
	$γ 2 1 - 6$	黑云母花岗岩	6	(0.23~6.46)/2.89	(0.03~1.65)/0.89	(0.75~18.45)/8.61	40
		花岗岩	9	(0.23~6.46)/2.79	(0.14~1.58)/0.92	(0.75~18.45)/8.47	41
		斑状花岗岩	6	(1.32~5.86)/3.03	(0.30~1.63)/0.94	(2.29~15.88)/8.24	42
	$γ 2 1 - 5$	斑状花岗岩	6	(1.34~2.49)/1.90	(0.66~1.42)/0.97	(3.58~7.44)/5.31	43
		黑云母花岗岩	24	(0.86~5.28)/1.94	(0.23~2.70)/0.93	(2.23~31.41)/5.64	44
		花岗岩	9	(1.28~2.31)/1.83	(0.09~1.12)/0.62	(1.53~5.66)/4.34	45
	$ν 2 1 - 2$	辉长岩	10	(0.16~1.57)/0.71	(0.26~1.35)/0.59	(0.47~3.73)/1.51	46
	$N 2 1 - 1$	辉长岩	18	(0.24~2.98)/1.40	(0.22~2.48)/1.21	(0.51~13.86)/4.84	47
		角闪辉长岩	2	(1.00~2.21)/1.61	(0.62~1.29)/0.96	(1.10~5.88)/3.49	48
		角闪辉长辉绿岩	8	(0.30~5.84)/2.57	(0.16~4.92)/1.05	(0.87~24.38)/7.67	49
		闪长岩	4	(0.43~1.33)/0.88	(0.45~1.03)/0.74	(0.71~2.74)/1.73	50
	ρ	白云母伟晶花岗岩脉	6	(4.27~7.56)/5.53	(0.88~23.34)/8.24	(3.30~10.19)/6.68	51
	γ	黑云母花岗岩、细粒花岗岩脉	2	(4.63~5.72)/5.18	(1.77~5.51)/3.64	(10.91~23.43)/17.17	52

Statistic table of measured radioactive parameters of measured intrusive rocks

Table 4)
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Statistics of the average value of the measured formation radioactivity (the serial numbers in the figure correspond to Table 4)

Table 5)
">

Statistical graph of the average radioactivity of the measured intrusive rocks (the serial numbers in the figure correspond to Table 5)

γ 2 1 - 6—biotite-bearing granite, gneissic porphyritic granite;

Γ 2 1 - 5

—granite;

N 2 1 - 1

—basic rock
">

Comprehensive comparison map of the anomaly in the west of Miaoba Village
a—aeromagnetic ΔT section plane; b—aeromagnetic ΔT contour plane; c—K content contour plane; d—U contour plane; e—Th content contour plane; f—1:200,000 geological map;

γ 2 1 - 6

—biotite-bearing granite, gneissic porphyritic granite;

Γ 2 1 - 5

—granite;

N 2 1 - 1

—basic rock

γ 5 1—granite
">

The comprehensive comparison diagram of Wangjiawan anomaly (Shaan C-65-114) and the northeast anomaly of Guihua Village (Shaan C-2018-302)
a—aeromagnetic ΔT section plane; b—aeromagnetic ΔT contour plane; c—K content contour plane; d—geophysial map; Q—Quaternary system; E—Paleogene; (∈-Ο)dh—Donghe group; ∈_2-3—upper Cambrian system; ∈₁—lower Cambrian system; Z_ayl—Yaolinghe group; Z_ayx—Yunxi group; γδ₃—biotite hornblende granite, biotite quartz diorite;

γ 51

—granite

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