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Application of tensor csamt with high-power orthogonal signal sources in Jiama porphyry copper deposit,South Tibet

China Geology 2023年第1期6卷 37-49页

作者： Peng-liang Yu Ting Qu Ri-zheng He Jian-li Liu Su-fen Wang Xiao-long Chen Shaanxi Geology and Mining Geophysical and Geoehemical Prospecting Team Co. Ltd.Xi’an 710043China Chinese Academy of Geological Sciences Beijing 100037China

The Jiama porphyry copper deposit in Tibet is one of the proven supergiant copper deposits in the Qinghai-Tibet Plateau at present,with the reserves of geological resources equivalent to nearly 20×10^(6) ***,it features wavy and steep terrain,leading to extremely difficult field operation and heavy *** study attempts to determine the effects of the tensor controlled-source audiomagnetotellurics(csamt)with high-power orthogonal signal sources(also referred to as the high-power tensor csamt)when it is applied to the deep geophysical exploration in plateaus with complex terrain and mining areas with strong *** test results show that the high current provided by the highpower tensor csamt not only greatly improved the signal-to-noise ratio but also guaranteed that effective signals were received in the case of a long transmitter-receiver ***,the tensor data better described the anisotropy of deep geologic *** addition,the tests also show that when the transmitting current reaches 60 A,it is still guaranteed that strong enough signals can be received in the case of the transmitter-receiver distance of about 25 km,sounding curves show no near field effect,and effective exploration depth can reach 3 *** 2D inversion results are roughly consistent with drilling results,indicating that the high-power tensor csamt can be used to achieve nearly actual characteristics of underground electrical ***,this method has great potential for application in deep geophysical exploration in plateaus and mining areas with complex terrain and strong interference,*** study not only serves as important guidance on the prospecting in the Qinghai-Tibet Plateau but also can be used as positive references for deep mineral exploration in other areas.

关键词： Jiama porphyry copper deposit Supergiant copper polymetallic deposit tensor csamt of 150 kw high power 2D inversion Deep prospecting Mineral exploration engineering Xizang(Tibet)

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