多道能谱测量在冀东花岗岩型稀有金属矿勘查中的应用

doi:10.11720/wtyht.2021.1562

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Abstract

There are many Yanshanian granite intrusions in eastern Hebei, which constitute a good metallogenic background of granite-type rare metal deposits. In order to study the metallogenic prospects of these rock masses, the authors chose the Hanerzhuang granitic body in this area as the research object, and carried out the multi-channel energy spectrum survey to analyze the characteristics of radioactive parameters of different lithologies, the characteristics of radioactive anomalies and their relationship with rare metal mineralization. The results show that the average content of U, Th and total trace in the monzogranite is 9 times, 8.5 times and 3.9 times the background value in the whole area, respectively. The distribution characteristics of the anomaly field are basically consistent with the surface outburst form of the monzogranite. Combined with the results of petrogeochemical study and artificial heavy sand, the authors hold that the monzogranite whole rock has a good mineralization of rare metals. The rocks contain a large number of U, Th and Hf minerals such as yttrium-brown niobium ore and monazite, and these minerals have a symbiotic relationship with Nb, Ta, Rb and other rare metal minerals. According to the distribution of anomaly field and the characteristics of thorium potassium, thorium uranium, uranium potassium ratio and other parameters, the favorable areas of rare metal mineralization can be directly delineated to guide the arrangement of prospecting engineering. The effective implementation of this method provides a convenient, efficient and cheap means for the exploration of rare metals in the granite area in the future.

Key words： granite rare metal deposits multichannel energy spectrum measurement eastern Hebei

Received: 14 December 2020 Published: 20 August 2021

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	Li-Qun CHENG
	Wen-Yu ZHANG
	Kai WANG
	Bin WANG
	Ming-Xing PEI

Cite this article:

Li-Qun CHENG,Wen-Yu ZHANG,Kai WANG, et al. The application of multi-channel energy spectrum survey to the exploration of granite type rare metal deposits in eastern Hebei[J]. Geophysical and Geochemical Exploration, 2021, 45(4): 942-950.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1562 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I4/942

The geological and engineering layout of the study area
1—Quaternary;2—gneiss;3—potassium feldspar granite;4—monzogranite;5—granitic porphyry;6—atitude of stratum;7—geological boundary;8—fault and serial number;9—location and serial number ofmultichannel energy spectrum and petrogeochemical survey section;10—location and number of probing groove

岩石 (地层)	w(U)/10^-6			w(Th)/10^-6			w(K)/%			总道/10^-6
岩石 (地层)	$X ˉ$	S_d	C_v	$X ˉ$	S_d	C_v	$X ˉ$	S_d	C_v	$X ˉ$	S_d	C_v
第四系	1.29	0.70	0.54	7.42	3.76	0.51	1.87	0.33	0.17	11.99	4.41	0.37
片麻岩	0.74	0.51	0.69	3.92	2.34	0.60	1.79	0.59	0.33	9.00	3.42	0.38
钾长花岗岩	1.36	0.81	0.59	12.19	3.21	0.26	3.36	0.74	0.22	18.97	4.16	0.22
二长花岗岩	8.59	3.11	0.36	52.20	18.11	0.35	3.01	0.57	0.19	44.08	12.60	0.29
全区	0.95	0.63	0.66	6.09	4.13	0.68	2.15	0.78	0.36	11.12	4.94	0.45

The characteristics of rock (stratum) multichannel energy spectrum parameters

元素 (单位)	背景值	标准方差	偏高场	高场	异常场
元素 (单位)	$X ˉ$	S_d	≥ $X ˉ$ +S_d	≥ $X ˉ$ +2S_d	≥ $X ˉ$ +3S_d
K/%	2.15	0.78	2.93~3.70	3.70~4.48	4.48
Th/10^-6	6.09	4.13	10.22~14.35	14.35~18.48	18.48
U/10^-6	0.95	0.63	1.58~2.21	2.21~2.83	2.83
总道/10^-6	11.12	4.94	16.07~21.01	21.01~25.95	25.95

The multichannel energy spectrum anomaly levels

The composite profile of line 3
1—quaternary;2—gneiss;3—monzogranite(mineralized belt);4—attitude of stratum

The plane profile of multichannel energy spectrum
1—Quaternary;2—gneiss;3—potassium feldspar granite;4—monzogranite(mineralized belt);5—fault;6—multichannel energy spectrum measurement section position and number

The petrogeochemical characteristics of the strata in the study area10^-6

Element correlation coefficient matrix

Cross plot of uranium and thorium about rare metal mineralization

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