航空时间域电磁法在澳大利亚新英格兰造山带铜多金属矿靶区优选与评价中的应用

doi:10.11720/wtyht.2019.1295

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Abstract

The New England Orogen(NEO)is located in East Australia. Due to the numerous copper polymetallic deposits or ore spots and the complicated evolution history of tectonic activity, NEO shows the high exploration potential for copper polymetallic minerals, even large-sized deposits. The airborne electronic anomalies were delineated by airborne time-domain electromagnetic method. Based on the aerial electronic anomalies and using a method called "Seeking Common" with the known copper polymetallic ore spots, the authors performed the optimization and evaluation of copper polymetallic minerals in an exploration license within quite difficult topographic conditions for ground exploration in NEO. Using the airborne time-domain electromagnetic method, the authors rapidly and effectively determined and optimized nine copper polymetallic exploration targets. Those targets were classified into three levels: Level Ⅰ, Ⅱ, Ⅲ. Finally, and there were three, five and one targets for Level Ⅰ, Ⅱ, Ⅲ respectively. In a word, the work completed in this paper is expected to provide a referable case for rapidly and effectively conducting optimization and evaluation of copper polymetallic minerals in some special areas within difficult topographies for ground exploration both in China and abroad.

Key words： New England Orogen airborne time-domain electromagnetic method copper polymetallic minerals targets optimization and evaluation Versatile Time-Domain Electromagnetic Plus (VTEM ^Plus) System

Received: 09 August 2018 Published: 10 April 2019

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	Articles by authors
	Ming-Zuan XU
	Yan HUANG
	Jian-Sheng LIU
	Jian-Dong LIU
	Sheng-Yue LIANG
	Feng CHEN
	Jun-Cheng WANG

Cite this article:

Ming-Zuan XU,Yan HUANG,Jian-Sheng LIU, et al. The application of airborne time-domain electromagnetic method to the optimization and evaluation of copper and multi base-metals targets in New England Orogen, Australia[J]. Geophysical and Geochemical Exploration, 2019, 43(2): 298-307.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1295 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I2/298

Geological conditions of working area
1—Quaternary;2—Paleogene basalt;3—Paleogene bandstone, conglomerate & mudstone;4—Permian shale & conglomerate; 5— Permian sand-mudstone; 6— Permian shale; 7— Permian siltstone & shale; 8—Permian lamellar conglomerate & siltstone; 9—Permian lamellar mudstine & slate; 10—perimian lamellar mudstone, sand-mudstone, sandstone & conglomerate;11—carboniferous conglomerate & sandstone-shale;12—tuffaceous conglomerate & paraconglomerate;13—tuffaceous paraconglomerate;14—tuffaceous sandstone-conglomerate;15—carbonatized tuffaceous sandstone & shale;16—welded dacitic tuff;17—fumarolic dacitic-andesitic tuff;18—welded tuff, paraandesite & rhyolite;19—welded tuff with rubble; 20—VTEM working area;21—known mineralized occurrence;22—inferred fault;23—measured fault;24—stream

Working parameters of transmitting loop and receiver

Constitution of VTEM^Plus System

Total Magnetic Polarization Plan for Working Area

Time decay constan of dB/dt (Tau) contour of working area

Comprehensive profiles of testing line L10450
a—Log dB/dt curve;b—strength of B field (channel 13~25);c—strength of B field (channel 25~37);d—strength of B field (channel 37~48);e—RDI of apparent resistivity;f—CDI of conductivity

Final map of copper multi-metals minerals targeting assessment and optimization in working area
1—Quaternary;2—Paleogene basalt;3—Paleogene sandstone, conglomerate & mudstone;4—Permian shale & conglomerate; 5—Permian sand-mudstone; 6—Permian shale; 7—Permian siltstone & shale; 8—Permian lamellar conglomerate & siltstone; 9—Permian lamellar mudstine & slate; 10—Perimian lamellar mudstone, sand-mudstone, sandstone & conglomerate;11—carboniferous conglomerate & sandstone-shale;12—tuffaceous conglomerate & paraconglomerate;13—tuffaceous paraconglomerate;14—tuffaceous sandstone-conglomerate;15—carbonatized tuffaceous sandstone & shale;16—welded dacitic tuff;17—fumarolic dacitic-andesitic tuff;18—welded tuff, paraandesite & rhyolite;19—welded tuff with rubble; 20—VTEM working area;21—known mineralized occurrence;22—inferred fault;23— measured fault;24—numbers of electronic anomalies;25— channel 20 electronic anomalies (dB/dt);26—channel 25 electronic anomalies (dB/dt);27—channel 30 electronic anomalies (dB/dt);28—channel 35 electronic anomalies (dB/dt);29—numbers of magnetic anomalies; 30—metallogenic targets; 31—stream

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