综合物探方法在上杭盆地古石背地区铀矿勘查中的应用

doi:10.11720/wtyht.2020.0017

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Abstract

The paleo-Shibei area has a good geological background of uranium mineralization, and some mineralization spots and uranium anomalies have been found. The previous work was mainly focused on the surrounding and shallow parts of the mineralization spots, and the evaluation of the overall metallogenic environment and the understanding of the deep metallogenic conditions in the study area were insufficient. The authors briefly introduced the working methods of soil radon, ground gamma energy spectrum and audio frequency magnetotelluric survey, analyzed the uranium metallogenic environment in the study area by comprehensive geophysical survey, delineated the approximate position of uranium ore anomaly on the surface by carrying out soil radon and ground gamma energy spectrum survey, and found the paleo-rock back of ore-controlling fault by carrying out audio frequency magnetotelluric survey (AMT). The characteristics of the development of the fault and ore-controlling strata of Shimaoshan Group were determined, and the inferred interpretation data were verified by drilling, which provides a reference for the exploration of this type of uranium deposits.

Key words： AMT ground gamma spectrum soil radon paleo-Shibei area uranium exploration

Received: 15 January 2020 Published: 29 December 2020

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	Articles by authors
	Ying-Bin LI
	Ming-Hong XIE
	Zhan-Bin ZHANG
	Yi LI
	Bin WEI
	Wei ZHANG

Cite this article:

Ying-Bin LI,Ming-Hong XIE,Zhan-Bin ZHANG, et al. The application of comprehensive geophysical method to the exploration of uranium deposits in the paleo-Shibei area of Shanghang Basin[J]. Geophysical and Geochemical Exploration, 2020, 44(6): 1283-1293.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.0017 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I6/1283

Geological and survey line layout of the study area
1—upper Cretaceous; 2—lower Cretaceous fine-grained rhyolite; 3—lower Cretaceous biotite rhyolite; 4—lower Cretaceous tuffaceous sandstone; 5—lower Cretaceous andesite; 6—upper Jurassic dolomitic limestone; 7—upper Carboniferous sandstone conglomerate; 8—yanshanian granite porphyry; 9—yanshanian sub rhyolite; 10—measured fault; 11—compression torsion fault; 12—tensile fault; 13—inferred fault; 14—ground gamma energy spectrum, soil radon line and its number; 15—AMT line and its number

线号	点数	$w (U) / 10 - 6 最大值最小值平均值$			$w (Th) / 10 - 6 最大值最小值平均值$			$w (K) / % 最大值最小值平均值$
L01	50	123.78	2.36	9.86	55.96	17.33	29.83	12.6	0.47	3.66
L02	50	18.29	1.9	4.58	13.64	40.93	24.74	6.85	0.58	2.68
L03	50	34.69	2.39	12.39	38.12	16.61	27.69	2.73	0.46	1.33
L04	50	30.76	1.07	4.9	47.77	24.01	35.85	7.98	0.25	1.82
L05	60	45	2	7.09	39.9	17.8	28.79	7.2	0.7	2.06
L06	49	32.5	1.7	4.69	40.42	8.22	22.35	9.15	1.33	4.09
L07	50	14.87	1.86	5.73	41.07	6.41	21.22	4.77	0.89	2.62
L08	49	22.76	1.81	6.20	45.01	9.16	20.08	3.87	0.63	2.06
L09	50	10.8	1.57	4.23	43.33	9.05	17.52	4.27	1.07	2.34
L10	50	18.63	2.37	8.19	34.11	7.84	15.03	6.83	0.26	2.48

Statistical table of ground gamma spectrum measurement results

Distribution histogram of K, U, Th and their ratio of ground gamma spectrum in the study area

Isopleth map of activated uranium (a) and paleouranium abundance (b) in the study area
1—upper Cretaceous; 2—lower Cretaceous fine-grained rhyolite; 3—lower Cretaceous biotite rhyolite; 4—lower Cretaceous tuffaceous sandstone; 5—lower Cretaceous andesite; 6—upper Jurassic dolomitic limestone; 7—upper Carboniferous sandstone conglomerate; 8—yanshanian granite porphyry; 9—yanshanian sub rhyolite; 10—measured fault; 11—compression torsion fault; 12—tensile fault; 13—speculative fault

Statistical table of ground gamma spectrum and soil radon measurement data in the study area

Study area U, K, RN, Th contour plan
1—upper Cretaceous; 2—lower Cretaceous fine-grained rhyolite; 3—lower Cretaceous biotite rhyolite; 4—lower Cretaceous tuffaceous sandstone; 5—lower Cretaceous andesite; 6—upper Jurassic dolomitic limestone; 7—upper Carboniferous sandstone conglomerate; 8—yanshanian granite porphyry; 9—yanshanian sub rhyolite; 10—measured fault; 11—compression torsion fault; 12—tensile fault; 13—inferred fault; 14—circle abnormal halo and its number

Composite anomaly halo map of comprehensive geophysical exploration in the paleoshibei area
1—upper Cretaceous; 2—lower Cretaceous fine-grained rhyolite; 3—lower Cretaceous biotite rhyolite; 4—lower Cretaceous tuffaceous sandstone; 5—lower Cretaceous andesite; 6—upper Jurassic dolomitic limestone; 7—upper Carboniferous sandstone conglomerate; 8—yanshanian granite porphyry; 9—yanshanian sub rhyolite; 10—measured fault; 11—compression torsion fault; 12—tensile fault; 13—inferred fault; 14—circle U abnormal halo and its serial number; 15—circle K abnormal halo and its serial number; 16—circle Rn abnormal halo and its serial number

地层	岩性	代号	测量数(组)	电阻率/(Ω·m)
地层	岩性	代号	测量数(组)	测量值范围	常见值范围	平均值
沙县组	泥岩	K₂s	30	23~99	23~54	36
石帽山群	流纹岩	K₁sh^b-4	34	403~1214	403~645	515
	凝灰质细砂岩	K₁s $h 2 b ? 2$	30	63~365	98~240	167
	凝灰质砂岩	K₁sh^b-1	31	130~259	130~259	180
	安山岩	K₁sh^a	32	199~646	260~455	355
长林组	砾岩	J₃c	31	135~487	170~350	253
黄龙组	灰岩	C₂h	31	91~418	167~322	256
	燕山期花岗斑岩	γ $π 53$	31	103~1674	584~1175	800

Statistical table of measurement results of electrical parameters of rock

Interpretation map (b)of inversion resistivity section (a)of G16Y05 line
1—Shaxian formation: calcareous mudstone, siltstone, glutenite; 2—Shimaoshan group: rhyolite, tuffaceous sandstone, dacite, andesite, etc.; 3—Huanglong formation: gray white dolomitic limestone, siliceous rock; 4—Woodland formation: Quartz conglomerate, glutenite, coarse sandstone with siltstone, shale; 5—granite porphyry; 6—inferred unconformity contact boundary; 7—inferred lithology contact boundary; 8—inferred fault and number

Comprehensive diagram of geological inference and interpretation in ancient Shibei area
1—Shaxian formation: calcareous mudstone, siltstone, glutenite; 2—Shimaoshan group: rhyolite, tuffaceous sandstone, dacite, andesite, etc.; 3—Huanglong formation: gray white dolomitic limestone, siliceous rock+Woodland formation: Quartz conglomerate, glutenite, coarse sandstone with siltstone, shale; 4—granite porphyry; 5—inferred unconformity contact boundary; 6—inferred lithology contact boundary; 7—inferred fault and number

Comprehensive interpretation map of U, K, Th, Rn concentration profile of line L05 (a)(b) and inversion resistivity profile of line G16Y04 (c)
1—tuffaceous sandstone of Shimaoshan group; 2—andesite of Shimaoshan group; 3—Huanglong formation; 4—granite porphyry; 5—inferred unconformity contact boundary; 6—inferred lithology contact boundary; 7—inferred fault and number; 8—uranium content curve; 9—radon concentration curve; 10—potassium content curve; 11—thorium content curve; 12—borehole

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