综合地球物理探测在深部空间结构中的应用——以胶东金矿集区为例

doi:10.11720/wtyht.2022.1102

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Abstract

Jiaodong area is one of the major gold producing areas in China, and the deep prospecting in this area is to seek deep breakthroughs and blind spots at present. With the gold concentration area in Jincheng Town in Laizhou City and Ershilidian Town in Haiyang City as an example and based on the prediction and assessment theory and method of deep gold resources, this study summarizes the deep spatial characteristics and relationships of the Archaeozoic-Mesozoic intrusive rocks, Precambrian metamorphic basement, and the strata in Jiaolai Basin in the area and the deep morphology and characteristics of major ore-controlling structures in the area. To this end, section measurement was carried out using the integrated geophysical exploration of high-precision gravity survey, high-precision magnetic survey, and magnetotelluric sounding. Meanwhile, the obtained gravity, magnetic, and resistivity data were comprehensively researched and analyzed in combination with previous results. This study will provide a basis for the late prospecting prediction of deep gold deposits and related researches of the area.

Key words： gravity and magnetic exploration magnetotelluric sounding Mesozoic intrusive rocks Precambrian metamorphic basement Jiaolai Basin

Received: 26 February 2021 Published: 25 February 2022

ZTFLH:

P631

Corresponding Authors: WANG Run-Sheng E-mail: cdl2602080210@sina.com;wrs674@126.com

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	Articles by authors
	Da-Lei CHEN
	Run-Sheng WANG
	Chun-Yan HE
	Xun WANG
	Zhao-Kai YIN
	Jia-Bin YU

Cite this article:

Da-Lei CHEN,Run-Sheng WANG,Chun-Yan HE, et al. Application of integrated geophysical exploration in deep spatial structures: A case study of Jiaodong gold ore concentration area[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 70-77.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1102 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/70

Geological sketch of the study area
1—Quaternary alluvium;2—Neocene;3—the Cretaceous wang group;4—the Cretaceous qingshan group;5—the Cretaceous laiyang group;6—qingbaikou-Sinian penglai group;7—Paleoproterozoic fenzishan group;8—Paleoproterozoic jingshan group;9—Cretaceous laoshan type granite;10—the Cretaceous yushan type granodiorite porphyry;11—Cretaceous weide mountain type granite;12—Cretaceous guojialing type granite;13—Triassic liulinzhuang type diorite;14—Jurassic linglong type granite;15—Jurassic wendeng type granite;16—Paleoproterozoic laizhou assemblage;17—Paleoproterozoic double-topped gneiss suite;18—Neoarchean qixia gneiss suite;19—Neoarchean association of malianzhuang;20—the middle Archean guandiwa assemblage;21—geological boundary;22—angular unconformity boundary;23—parallel unconformity boundaries;24—ductile shear contact boundary;25—the measured fault;26—inferred fault;27—tough shear zone;28—the location of gravity, magnetism and electricity composite profile

Statistical table of regional stratigraphic physical parameters

Statistical table of regional magmatic rock physical property parameters

Integrated inversion flow of gravity, magnetism and electricity

Joint inversion geological interpretation results map
1—Quaternary alluvium;2—Cretaceous - Paleogene wang group;3—Cretaceous qingshan group;4—Early Cretaceous laiyang group;5—Paleoproterozoic jingshan group;6—Paleoproterozoic jiaonan supercrust rock assemblage;7—New Archean qixia sequence;8—Neoproterozoic rongcheng sequence;9—Mesozoic linglong sequence;10—Mesozoic weideshan sequence;11—latent volcanoes;12—grade inference Ⅰ fracture;13—grade inference Ⅱ fracture;14—grade inference Ⅲ fracture;15—inferred basement fault;16—inferred geological boundary

Inferred map of gravity, magnetism and electricity joint inversion
1—Quaternary alluvium;2—Cretaceous - Paleogene wang group;3—Cretaceous qingshan group;4—Early Cretaceous laiyang group;5—jingshan group;6—qixia sequence; 7—rongcheng sequence;8—linglong sequence;9—wade mountain sequence;10—latent volcanoes; a—geologic section map; b—MT two-dimensional electrical structure diagram;c—initial geology-geophysical model;d—actual measurement and inversion fitting ΔT curve;e—actual measurement and inversion fitting Δg curve; f—gravity and magnetic joint inversion to infer the physical properties of blocks

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