吴懿豪^1,,
韩江涛^1,2,,,
刘云鹤^1,2,
刘立家^1,2,
郭磊³,
管烨³,
张颖慧³,
李帅¹
1. 吉林大学地球探测科学与技术学院, 长春 130026
2. 自然资源部应用地球物理重点实验室, 长春 130026
3. 中国地质科学院地质研究所, 北京 100037

基金项目: 国家重点研发专项（2017YFC0601305），中国地质调查项目（DD20160125，DD20160207，DD20190010），国家自然科学基金项目（41504076）联合资助


详细信息

作者简介: 吴懿豪, 男, 1996年生, 吉林大学博士研究生, 主要从事大地电磁应用研究.E-mail: wuyh18@mails.jlu.edu.cn

通讯作者: 韩江涛, 男, 教授, 主要从事深部地球物理勘查研究.E-mail: hanjt@jlu.edu.cn

中图分类号: P319;P631

收稿日期:2020-10-09
修回日期:2020-11-16
上线日期:2021-04-10

Three-dimensional electrical structures and mineralization significance in the Shuangjianzishan ore-concentrated area, Inner Mongolia

WU YiHao^1,,
HAN JiangTao^1,2,,,
LIU YunHe^1,2,
LIU LiJia^1,2,
GUO Lei³,
GUAN Ye³,
ZHANG YingHui³,
Li Shuai¹
1. College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China
2. Key Laboratory of Applied Geophysics, Ministry of Natural Resources, Changchun 130026, China
3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China


More Information

Corresponding author: HAN JiangTao,E-mail:hanjt@jlu.edu.cn

MSC: P319;P631

--> Received Date: 09 October 2020
Revised Date: 16 November 2020
Available Online: 10 April 2021


摘要
摘要:双尖子山矿集区作为中国北方东部大型的银铅锌多金属矿集区，具有多期叠加成矿的特征.为了揭示双尖子山矿集区2000 m以浅成矿要素的空间展布，本文基于有限内存拟牛顿法（L-BFGS）对覆盖矿集区的6条可控源音频大地电磁测深数据进行含源三维反演，获得了双尖子山矿集区2000 m以浅三维精细电性结构.结合重磁、区域地质、钻井及地球化学资料，得到如下结论：（1）矿集区深部存在大面积的高阻区，可能为与成矿有关的早白垩纪侵入岩的反映，在兴隆山矿段西北侧及西南侧（A、B区）、双尖子山矿段西部（C区）表现为高侵位特征；（2）矿集区与成矿密切相关的断裂系统由1条北东向深断裂（F1）和北西向、北东向以及近南北向的浅层断裂组成；（3）赋矿地层大石寨组电性特征为中低阻，主要分布在1000 m以浅，在兴隆山矿段以及双尖子山矿段东部较厚，与矿集区断裂系统组成了良好的容矿空间和成矿流体上涌通道；（4）建立了矿集区2000 m以浅的成矿模式：在兴隆山矿段，早白垩世侵入岩高度侵位至上覆大石寨组下方，侵入岩就位后析出含矿热液，并在浅部北东、北西向断裂及断裂交汇处成岩成矿，而在双尖子山矿段，成矿流体主要受北东向深断裂F1的控制，在F1断裂以及其与北西向断裂的交汇处富集，导致矿体主要分布于矿段西部.
关键词: 双尖子山矿集区/
可控源音频大地电磁测深/
含源三维反演/
电性结构/
成矿模式

Abstract:The Shuangjianzishan ore concentrated area is a large-scale Ag-Pb-Zn ore concentration area in northeastern China. It is characterized by multi-stage superimposed mineralization. In order to reveal the spatial distribution of ore factor above 2000 m in the area, in this paper, based on limited memory quasi-Newton method, we carried out three-dimensional inversion with grounded sources for 6 controlled source audio magnetotelluric lines, which overing the ore-concentrated area, and obtained the fine three-dimensional electrical structure above 2000 m in the ore-concernteted area. Combined with magnetic, geology, drilling and geochemical data, we get the following conclusions: (1) There is large-scale of high resistance area in the deep of ore-concentration area, which may be the reflection of intrusive rock in the early Cretaceous associated with mineralization. In the northwest and southwest of Xinglongshan mine section (A and B area), and the west of Shuangjianzishan mine section (C area), intrusive rock is characterized by high emplacement. (2) The fault system closely related to mineralization is composed of a deep NE fault (F1) and several shallow NW, NE, and nearly NS faults. (3) The Dashizhai group, which is ore-host strata, reveals low and medium resistance. It mainly distributes above 1000 m, and it becomes thicker in the Xinglongshan mine section and the east of the Shuangjianzishan mine section. It provided favorable ore-host space and the upwelling channel for ore-forming fluid with the fault system. (4) We have established the mineralization model above 2000 m in ore concentrated area. In the Xinglongshan ore section, the early Cretaceous intrusive rock was highly emplaced below the Dashizhai group. When the intrusive rock was in place, the ore-host hydrothermal fluid was separated, and then the diagenesis and mineralization of the fluid was mainly affected by the shallow NE and NW faults and the intersection of the faults. In the Shuangjianzishan ore section, the ore-forming fluid was mainly controlled by the deep NE fault F1. And it is mainly enriched in the F1 fault and its intersection with the NW faults, causing the ore bodies are mainly distributed in the western part of the Shuangjianzishan section.
Key words:Shuangjianzishan ore-concentrated area/
Controlled source audio magnetotelluric sounding/
Three-dimensional inversion/
Electrical model/
Metallogenic model



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