辽东郑屯地区基于广域电磁法的深孔验证

doi:10.11720/wtyht.2024.1428

Abstract
Figure/Table
References
Related Citation (3)

Download: PDF (5860 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract

The development of gold deposits in the Liaodong region is considered to be controlled by the superimposed detachment fault zone of the metamorphic core complex system. The traditional view holds that the thickness of the cap rocks of the Yongning Formation in the Yongning Basin can exceed thousands of meters, thus hindering the migration of ore-bearing fluids and the formation of large-scale metal deposits. The exploration of deposits in the Liaodong region has remained within a depth of 1 km due to limited exploration efforts and insufficient research. This study obtained the resistivity distribution characteristics within a depth of 3 km in the Zhengtun area using the wide-field electromagnetic method (WFEM), ascertaining that the thickness of the cap rocks in the Liaodong region is around 1 km, in sharp contrast to the extremely thick cap rocks in the Yongning Formation. As verified by the 2 km deep drilling, an unconformable contact between the Yongning Formation and the underlying Archean basement was observed at a hole depth of 1 345 m, without significant structural detachment near the boundary. This study demonstrates that the thickness of the cap rocks in the Yongning Basin is merely around 1 km. Considering multistage active fault structures and densely distributed hypabyssal rock vein swarms in the area, it is preliminarily determined that the geological setting for mineralization in the Yongning Basin is akin to that of the Jiaodong gold ore concentration area. The ore-bearing metamorphic fluids or magmatic-hydrothermal fluids might have migrated to the upper part of the boundary for mineralization during the destruction of the North China craton. Overall, the Liaodong region has the potential to achieve breakthroughs in polymetallic prospecting, and the WFEM pinpoints the deep mineralization prediction.

Key words： North China craton Liaodong cap rock wide-field electromagnetic method (WFEM) deep drilling

Received: 13 October 2023 Published: 27 June 2024

ZTFLH:

P631

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	Wei-Tian LIANG
	Di-Quan LI
	Xin-Sheng SUN
	Dong-Bo WANG
	Jia-Xin FENG
	Hao LI
	Jin-Hu FAN

Cite this article:

Wei-Tian LIANG,Di-Quan LI,Xin-Sheng SUN, et al. Deep-hole verification of wide-field electromagnetic method-derived results in the Zhengtun area of the Liaodong region[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 675-683.

URL:

https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1428 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/675

7],Zhu R X,et al^[6])
">

Geodetic structure diagram of working area(Sun X M,et al^[7],Zhu R X,et al^[6])

Statistical table of physical properties in work area

Geological sketch of project layout

Comparison between wide field electric field and natural field

Comprehensive analysis diagram of WFEM (a) and large depth IP (b)

Histogram of contact surface between cover and base

Rock and ore samples and microscopic photos
a—Polymetallic sulfide veins within the surface gold mineralization alteration zone;b—Core photo of 120 m deep gold bearing structural altered rock zone;c—Core photos of 1 400 m deep gold bearing structural altered rock zone

R-type cluster analysis diagram of borehole verification geochemical survey

Metallogenic model map of Zhengtun area
a—Metallogenic pattern map ; b—Local measured geological profile

[1]	刘福来, 刘平华, 王舫, 等. 胶—辽—吉古元古代造山-活动带巨量变沉积岩系的研究进展[J]. 岩石学报, 2015, 31(10):2816-2846.
[1]	Liu F L, Liu P H, Wang F, et al. Progresses and overviews of voluminous meta-sedimentary series within the Paleoproterozoic Jiao-Liao-Ji orogenic-mobile belt,North China Craton[J]. Acta Petrologica Sinica, 2015, 31(10) :2816-2846.
[2]	Yang L Q, Deng J, Guo L N, et al. Origin and evolution of ore fluid,and gold-deposition processes at the giant Taishang gold deposit,Jiaodong Peninsula,Eastern China[J]. Ore Geology Reviews, 2016,72:585-602.
[3]	Wen B, Fan H, Santosh M, et al. Genesis of two different types of gold mineralization in the Linglong gold field,China:Constrains from geology,fluid inclusions and stable isotope[J]. Ore Geology Reviews, 2015,65:643-658.
[4]	张秋生. 辽东半岛早期地壳与矿床[M]. 北京: 地质出版社,1988.
[4]	Zhang Q S. Early crust and mineral deposits in Liaodong Peninsula[M]. Beijing: Geological Publishing House,1988.
[5]	朱日祥, 郑天愉. 华北克拉通破坏机制与古元古代板块构造体系[J]. 科学通报, 2009, 54(14):1950-1961.
[5]	Zhu R X, Zheng T Y. Failure mechanism of North China Craton and Paleoproterozoic plate tectonic system[J]. China Science Bulletin, 2009, 54 (14):1950-1961.
[6]	朱日祥, 范宏瑞, 李建威, 等. 克拉通破坏型金矿床[J]. 中国科学:地球科学, 2015, 45(8):1153-1168,1-4.
[6]	Zhu R X, Fan H R, Li J W, et al. Decratonic gold deposits[J]. Scientia Sinica:Terrae, 2015, 45(8):1153-1168,1-4.
[7]	孙晓猛, 王书琴, 王英德, 等. 郯庐断裂带北段构造特征及构造演化序列[J]. 岩石学报, 2010, 26(1):165-176.
[7]	Sun X M, Wang S Q, Wang Y D, et al. Structural characteristics and tectonic evolution sequence of the northern segment of Tanlu fault zone[J]. Acta Petrologica Sinica, 2010, 26(1):165-176.
[8]	陈衍景, 翟明国, 蒋少涌. 华北大陆边缘造山过程与成矿研究的重要进展和问题[J]. 岩石学报, 2009, 25(11):2695-2726.
[8]	Chen Y J, Zhai M G, Jiang S Y. Significant achievements and open issues in study of orogenesis and metallogenesis surrounding the North China continent[J]. Acta petrologica Sinica, 2009, 25 (11):2695-2726.
[9]	付海涛. 辽宁省瓦房店地区金刚石原生矿找矿信息研究[J]. 地质找矿论丛, 2005, 20(4):281-285,290.
[9]	Fu H T. Study on the primary diamond ore search information for Wafangdian Area,Liaoning Province[J]. Contributions to Geology and Mineral Resources Research, 2005, 20(4):281-285,290.
[10]	朱志澄. 伸展构造和拆离断层[J]. 地质科技情报, 1987, 6(1):18-25.
[10]	Zhu Z C. Extensional structure and detachment fault[J]. Geological science and technology information, 1987, 6(1):18-25.
[11]	朱志澄. 变质核杂岩和伸展构造研究述评[J]. 地质科技情报, 1994, 13(3):1-8.
[11]	Zhu Z C. Review on metamorphic core complex and extensional structures[J]. Bulletin of Geological Science and Technology, 1994, 13(3):1-8.
[12]	纪沫, 胡玲, 刘俊来, 等. 辽南变质核杂岩主拆离断层的波瓦状构造(corrugation)及其成因[J]. 地质科学, 2008, 43(1):12-22,49.
[12]	Ji M, Hu L, Liu J L, et al. Features and mechanism of corrugation structure in the Liaonan (southern Liaoning) metamorphic core complex[J]. Chinese Journal of Geology:Scientia Geologica Sinica, 2008, 43(1):12-22,49.
[13]	刘俊来, 纪沫, 申亮, 等. 辽东半岛早白垩世伸展构造组合、形成时代及区域构造内涵[J]. 中国科学:地球科学, 2011, 41(5):618-637.
[13]	Liu J L, Ji M, Shen L, et al. Early Cretaceous extensional tectonic assemblage,formation age and regional tectonic connotation of Liaodong Peninsula[J]. Scientia Sinica:Terrae, 2011, 41(5):618-637.
[14]	解洪晶, 王玉往, 李德东, 等. 辽东青城子矿集区双顶沟岩体年代学及地球化学研究[J]. 地质学报, 2018, 92(6):1264-1279.
[14]	Xie H J, Wang Y W, Li D D, et al. Geochronology and geochemistry study of the shuangdinggou intrusion in the qingchengzi ore concentration area,eastern Liaoning Province[J]. Acta Geologica Sinica, 2018, 92(6):1264-1279.
[15]	杨凤超, 宋运红, 张朋, 等. 辽宁青城子矿集区金银矿成矿流体特征和成矿物质来源示踪[J]. 地质学报, 2016, 90(10):2775-2789.
[15]	Yang F C, Song Y H, Zhang P, et al. Forming fluid characteristics and tracing of ore-forming source materials of gold-silver deposit in the Qingchengzi ore concentration area[J]. Acta Geologicas Sinica, 2016, 90 (10):2775-2789.
[16]	何继善. 广域电磁测深法研究[J]. 中南大学学报:自然科学版, 2010, 41(3):1065-1072.
[16]	He J S. Wide field electromagnetic sounding methods[J]. Journal of Central South University:Science and Technology, 2010, 41(3):1065-1072.
[17]	李帝铨, 谢维, 程党性. E-E_x广域电磁法三维数值模拟[J]. 中国有色金属学报, 2013, 23(9):2459-2470.
[17]	Li D Q, Xie W, Cheng D X. Three dimensional modeling for E-E_x wide field electromagnetic methods[J]. The Chinese Journal of nonferrous metals, 2013, 23(9):2459-2470.
[18]	邓锋华, 杨洋, 李帝铨. 广域电磁法在隐伏金矿中的应用[J]. 工程地球物理学报, 2013, 10(3):357-362.
[18]	Deng F H, Yang Y, Li D Q. The application of wide-field electromagnetic method to hidden gold deposit[J]. Chinese Journal of Engineering Geophysics, 2013, 10(3):357-362.
[19]	梁维天, 李勇, 王东波, 等. 辽东南金属矿勘查中广域电磁法应用效果研究[J]. 物探与化探, 2020, 44(5):1078-1084.
[19]	Liang W T, Li Y, Wang D B, et al. Research on the application effect of WFEM in the exploration of metal deposits in the southeast of Liaoning Province[J]. Geophysical and Geochemical Exploration, 2020, 44(5):1078-1084.
[20]	毛景文, 李厚民, 王义天, 等. 地幔流体参与胶东金矿成矿作用的氢氧碳硫同位素证据[J]. 地质学报, 2005, 79(6):839-857.
[20]	Mao J W, Li H M, Wang Y T, et al. The relationship between mantle-derived fluid and gold ore-formation in the eastern Shandong peninsula:Evidences from D-O-C-S isotopes[J]. Acta Geologica Sinica, 2005, 79(6):839-857.
[21]	刘俊来, 崔迎春, 关会梅. 辽吉朝褶皱带古元古宙岩浆核杂岩及其大地构造意义[J]. 地质通报, 2002, 21(S1):202-206.
[21]	Liu J L, Cui Y C, Guan H M. Magmatic core complex in the Liaoning-Jilin-Korea Paleoproterozoic fold belt and its tectonic significance[J]. Geological Bulletin of China, 2002, 21(S1):202-206.
[22]	毛永涛. 辽东裂谷金矿地质特征及找矿标志[J]. 西部探矿工程, 2017, 29(9):161-164.
[22]	Mao Y T. Geological characteristics and prospecting criteria of gold deposits in Liaodong Rift valley[J]. West-China Exploration Engineering, 2017, 29(9):161-164.