The three-dimensional electrical characteristics of the typical iron and copper deposits in the Lujiang-Zongyang ore concentration area
-
摘要:
“玢岩型”铁矿和斑岩型铜矿是庐江—枞阳矿集区两个主要矿床类型，以往研究主要集中在矿床学、岩石学、年代学和地球化学等方面，地球物理工作开展相对较少。随着找矿深度不断加大，地球物理的作用越来越大。为建立典型矿床地球物理探测的解释“标尺”，笔者选择泥河铁矿和沙溪铜矿为研究对象，开展三维音频大地电磁测深工作，获得了典型铜、铁矿床及围岩的三维电性结构模型。结果显示，玢岩（泥河）铁矿电性主体表现为层状结构，由浅至深主要为低阻的沉积层、高阻火山岩、相对低阻的蚀变带以及相对高阻的次火山岩，赋存于次火山岩体顶部穹隆状的磁铁矿主要表现为高阻特征。斑岩（沙溪）铜矿电性主体表现为块状（或纵向带状）结构，浅表为低阻沉积盖层，深部主要为相对高阻的沉积地层和高阻斑岩体，赋存于岩体内或围岩接触带的矿体则为中等电阻特征。为便于模型的实用，笔者将两类矿床的复杂电性模型转化为简化的概念电性模型，为寻找类似矿床提供快速对比“标尺”。
Abstract:The porphyrite iron and porphyry copper ore deposits are the major deposit categories in the Lujiang-Zongyang ore concentration area. However, previous researches were mostly focused on mineralogy, petrology, geochronology and geochemistry, but paid less attention to geophysics. As the exploration depth is increasing, geophysical methods become more important. In order to develop the interpretation 'scaleplate' of the geophysical exploration for typical deposits, the authors took the Nihe iron and Shaxi copper ore deposits as the research subjects, and obtained the three-dimensional electrical models of the orebodies and the surrounding rocks through the audio-magnetotelluric sounding. The results indicate that the major structure of the porphyrite (Nihe) iron deposit is composed of several layers including low resistivity sedimentary rocks, high resistivity volcanic rocks, relatively low resistivity alteration zone and relatively high resistivity intrusive of subvolcanic rocks from shallow place to the depth. In addition, the magnetite body, which exists as a dome on the top of the mass, presents the characteristics of high resistivity. For the porphyry (Shaxi) copper deposit, the major electrical characteristics are the massive (or longitudinal belt) structures composed of the shallow sedimentary rocks with low resistivity, the deep sedimentary rocks with relatively high resistivity, and the porphyry mass with high resistivity. In addition, the orebodies, which exist in the mass or the contact zone between the mass and surrounding rocks, present electrical characteristics of medium resistivity. The orebodies hosted in the mass (or in the contact zone with surrounding rocks) present medium-resistivity. For the practicability of the models, the authors converted the inversion results with complex electrical structures into two facilitate models, which would be used as the comparative 'scaleplate' for the discovery of the similar deposits.
-
-
图 1 庐枞矿集区地质及矿产分布图（据Lü et al., 2015修改）
Figure 1.
-
Chang Yinfo, Liu Xuegui. 1983. On strata-bound skarn deposittaking deposits in the Lower Yangtze Depression in Anhui Province as examples[J]. Minieral Deposits, (1):11-20 (in Chinese).
Chang Yinfo, Liu Xiangpei, Wu Yanchang. 1991. Copper-iron Ore Deposits in Middle to Lower Reaches of Yangtze River Belt[M]. Beijing:Geological Publishing House, 1-379 (in Chinese).
Chen Leshou, Wang Guange. 1990. Magnetotelluric Method[M]. Beijing:Geological Publishing House, 1-180 (in Chinese)
Chen X B, Lü Q T, Yan J Y. 2012.3d electrical structure of porphyry copper deposit:a case study of Shaxi copper deposit[J]. Applied Geophysics, 9(3):270-278. doi: 10.1007/s11770-012-0337-1
Cheng Yuqi, Chen Yuchuan, Zhao Yiming. 1979. Preliminary discussion on metallogenic series of ore deposits[J]. Journal of the Chinese Academy of Geological Sciences, 1(1):32-58 (in Chinese).
Cheng Shaohua. 2012. Contrastive Analysis of Different Static Shift Correction Methods in Magnetotelluric (MT)[D]. Xi'an: Chang' an University, (in Chinese with English abstract).
Lü Qingtian, Wu Ming'an. 2013. Stereo Exploration Technology and Demonstration of Deep Metallogenic Prognosis in Luzong Ore District[R].China Geology Survey Project (in Chinese with English abstract).
Lü Qingtian, Wu Ming' an, Tang Jingtian, Zhou Taofa. 2017.ThreeDimensional Exploration and Deep Metallogenic Prognosis in Luzong Ore District, Anhui Province[M]. Beijing:Science Press, 256-330 (in Chinese).
Ningwu Research Project Team. 1978. Porphyrite Iron Ore of Ningwu[M]. Beijing:Geological Publishing House, 1-190 (in Chinese).
Mao J W, Wang Y T, Lehmann B, Yu J J, Du A D, Mei Y X, Li Y F, Zhang W S, Stein H J, Zhou T F. 2006. Molylxlenite Re-Os and albite 40Ar/39Ar dating of Cu-Au-Mo and magnetite porphyry systems in the Changjiang valley and metallogenic implications[J]. Ore Geol. Rev., 29:307-324. doi: 10.1016/j.oregeorev.2005.11.001
Qin Yongjun, Zeng Jiannian, Zeng Yong, Ma Zhendong, Chen Jinhua, Jin Xi. 2010. Zircon LA-ICP-MS U-Pb dating of ore-bearing pyroxene-trachyandesite porphyry and its geological significance in Luohe-Nihe iron ore field in Luzong basin, southern Anhui, China[J]. Geological Bulletin of China. 29(6):851-862 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=zgqydz201006007
Qiu Jiansheng, Ren Qijiang. 1991a. Spatial distribution pattern of orebearing fissures of the Shaxi porphyry copper (gold) deposit, Anhui and tis metallogeny[J]. Journal of Guilin College of Geology, 11(4):369-376 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-GLGX199104003.htm
Qiu Jiansheng, Ren Qijiang, Xu Zhaowen, Zhang Chongze. 1991b. An investigation on geological-geochemical characteristics of altered rocks in Shaxi porphyry copper (gold) deposit, Anhui Province[J]. Journal of Nanjing University, 27(2):344-358 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTotal-NJDZ199102016.htm
Ren Qijiang, Qiu Jiansheng, Xu Zhaowen, Zhang Chongze, Fang Changquan, Yang Rongyong. 1991. Formation conditions of the mineralized stock in the Shaxi porphyry copper (gold) deposit, Anhui Province[J]. Mineral Deposits, 10(3):232-241 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-KCDZ199103004.htm
Wu Mingan, Wang Qingsong, Zheng Guangwen, Cai Xiaobin, Yang Shixue, Di Qinsong. 2011. Discovery if the Nihe iron deposit in Lujiang, Anhui, and its exploration significance[J]. Acta Geologica Sinica, 85(5):802-809 (in Chinese with English abstract).
Xu Wenyi, Xu Zhaowen, Gu Lianxing, Ren Qijiang, Fu Bin, Niu Cuihui. 1999. Heat evolution from intrusion to mineralization in Shaxi porphyry copper(gold) deposits, Anhui Province[J]. Geological Review, 45(4):361-366 (in Chinese with English abstract). http://d.old.wanfangdata.com.cn/Periodical/OA000002019
Yan Jiayong, Lü Qingtian, Wu Mingan, Chen Xiangbin, Zhang Kun, Qi Guang. 2014. Propecting Indicator of Anhui Shaxi porphyry copper deposit based on regional gravity and magnetic 3D inversion[J]. Acta Geologica Sinica, 88(4), 507-518.
Zhang K, Wei W B, Lü Q T. 2014. Four changes for efficiency and practicality on previous 3D MT NLCG inversion algorithm[J]. Acta Geodaetica et Geophysica, 49:551-563. doi: 10.1007/s40328-014-0069-1
Zhang Kun. 2012. Objective Function Fitting Denoising Software For Magnetotelluric Data[P]. Intellectual Property Office of the People's Republic of China. 2012SR109144 (in Chinese).
Zhang K, Yan J Y, Lü Q T, Wei W B, Wang H F, Zhang Y W. 2016.Correction of magnetotelluric static shift by analysis of 3D forward modeling and measured test data[J].Explor. Geophys., 47:100-107. doi: 10.1071/EG14044
Zhang K, Yan J Y, Lü Q T, Zhao J H, Hu H. 2017. Three-dimensional nonlinear conjugate gradient parallel inversion with full information of marine magnetotellurics[J]. Journal of Applied Geophysics, 139:144-157. doi: 10.1016/j.jappgeo.2017.02.008
Zhang Kun, Dong Hao, Yan, Jiayong, Lü Qingtian, Wei Wenbo, He Yuxian. 2013. A NLCG inversion method of magnetotellurics with parallel structure[J].Chinese J. Geophys, 56(11):3922-3931 (in Chinese with English abstract). http://d.old.wanfangdata.com.cn/Periodical/wtyht201801007
Zhang Kun, Yan Jiayong, Lü Qingtian, Chen Xiangbin. 2015.The electromagnetic exploration experimentation of Nihe porphyry iron ore in Anhui[J]. Acta Geologica Sinica, 88(4), 496-506 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DZXE201404005.htm
Zhai Yusheng, Yao Shuzhen, Lin Xinduo. 1992. Metallogenic Regularity Of Iron, Copper and Gold in the Middle and Lower Reaches of the Yangtze River[M]. Beijing:Geological Publishing House, 1-210 (in Chinese).
Zhao Wenjin. 2008. Ore prospects and ore exploration methods for metal deposits in the middle and lower Yangtze River valley[J]. Geology in China, 35(5):771-802(in Chinese with English abstract).
Zhao Wenguang, Wu Mingan, Zhang Yiyong, Wang Keyou, Fan Yu, Wang Longyun, Wei Guohui, Che Yingdan. 2011. Geological characteristics and genesis of the Nihe Fe-S deposit, Lujiang Country, Anhui Province[J]. Acta Geologica Sinica, 85(5):789-801. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dizhixb201105013
Zhou Taofa, Fan Yu, Yuan Feng. 2008. Advances on petrogensis and metallogeny study of the mineralization belt of the Middle and Lower Reaches of the Yangtze River area[J]. Acta Petrologica Sinica, 24(8):1665-1678(in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=ysxb98200808001
常印佛, 刘学圭.1983.关于层控式矽卡岩型矿床——以安徽省内下扬子拗陷中一些矿床为例[J].矿床地质, 1(1):11-20. http://www.cnki.com.cn/Article/CJFDTotal-KCDZ198301001.htm
常印佛, 刘相培, 吴昌言. 1991.长江中下游地区铜铁成矿带[M].北京:地质出版社, 1-379.
陈乐寿和王光锷. 1990.大地电磁测深法[M].北京:地质出版社, 1-180.
程裕淇, 陈毓川, 赵一鸣. 1979.初论矿床的成矿系列问题[J].中国地质科学院院报, 1 (1):32-58. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=HY000001808464
程少华. 2012.大地电磁静态效应校正方法对比研究[D]西安: 长安大学.
http://cdmd.cnki.com.cn/Article/CDMD-10710-1013018912.htm 吕庆田, 吴明安, 项目研究小组成员. 2013.庐枞矿集区立体探测技术与深部成矿预测示范[R].中国地质调查项目.
吕庆田, 吴明安, 汤井田, 周涛发.2017.安徽庐枞矿集区三维探测与深部成矿预测[M].北京:科学出版社, 256-330.
宁芜研究项目编写组. 1978.宁芜玢岩铁矿[M].北京:地质出版社.
覃永军, 曾键年, 曾勇, 马振东, 陈津华, 金希.2010.安徽南部庐枞盆地罗河-泥河铁矿田含矿辉石粗安玢岩锆石LA-ICP-MS UPb定年及其地质意义[J].地质通报, 29(6):851-862. doi: 10.3969/j.issn.1671-2552.2010.06.007
邱检生, 任启江.1991a.安徽沙溪斑岩铜(金)矿床含矿裂隙的空间分布特征及矿床成因[J].桂林冶金地质学院学报, 11 (4):369-376. http://www.cnki.com.cn/Article/CJFDTOTAL-GLGX199104003.htm
邱检生, 任启江, 徐兆文, 张重泽.1991b.安徽沙溪斑岩铜(金)矿床蚀变岩地质地球化学特征研究[J].南京大学学报, 27 (2):344-358. http://d.old.wanfangdata.com.cn/Periodical/hfgydxxb201210024
任启江, 邱检生, 徐兆文, 张重泽, 方长泉, 杨荣勇.1991.安徽沙溪斑岩铜(金)矿床矿化小岩体的形成条件[J].矿床地质, 10(3):232-241. http://www.cnki.com.cn/Article/CJFDTOTAL-KCDZ199103004.htm
吴明安, 汪青松、郑光文、蔡晓兵、杨世学、狄勤松.2011.安徽庐江泥河铁矿的发现及意义[J].地质学报, 85(5):802-809. http://d.old.wanfangdata.com.cn/Periodical/dizhixb201105014
徐文艺, 徐兆文, 顾连兴, 任启江, 傅斌, 牛翠袆.1999.安徽沙溪斑岩铜(金)矿床成岩成矿热历史探讨[J].地质论评, 45(4):361-366. doi: 10.3321/j.issn:0371-5736.1999.04.004
严加永, 吕庆田, 吴明安, 陈向斌, 张昆, 祁光. 2014.安徽沙溪铜矿区域重磁三维反演与找矿启示[J].地质学报, 88(4):507-518. doi: 10.3969/j.issn.1006-7493.2014.04.002
张昆.2012.大地电磁场目标函数拟合去噪软件[P].中华人民共和国知识产权局: 2012SR109144.
张昆, 董浩, 严加永, 吕庆田, 魏文博, 何钰娴.2013.一种并行的大地电磁场非线性共轭梯度三维反演方法[J].地球物理学报, 56(11):3922-3931 doi: 10.6038/cjg20131134
张昆, 严加永, 吕庆田, 陈向斌. 2014.安徽泥河玢岩铁矿电磁法探测试验[J].地质学报, 88(4):496-506. doi: 10.3969/j.issn.1006-0995.2014.04.004
翟裕生, 姚书振, 林新多.1992.长江中下游地区铁铜(金)成矿规律[M].北京:地质出版社, 1-210.
赵文津. 2008.长江中下游金属矿找矿前景与找矿方法[J].中国地质, 35(5):771-802. doi: 10.3969/j.issn.1000-3657.2008.05.001 http://geochina.cgs.gov.cn/geochina/ch/reader/view_abstract.aspx?file_no=20080501&flag=1
赵文广, 吴明安, 张宜勇, 王克友, 范裕, 汪龙云, 魏国辉, 车英丹.2011.安徽省庐江县泥河铁硫矿床地质特征及成因初步分析[J].地质学报, 85(5):789-801. http://d.old.wanfangdata.com.cn/Periodical/dizhixb201105013
周涛发, 范裕, 袁峰, 2008.长江中下游成矿带成岩成矿作用研究进展[J].岩石学报, 24 (8):1665-1678. http://d.old.wanfangdata.com.cn/Periodical/ysxb98200808001
-
下载:
图(10)
计量
- 文章访问数: 2417
- PDF下载数: 686
- 施引文献: 0