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Crustal-scale structure and deformation of Lu-Zong ore district; joint interpretation from integrated geophysical data

Lu Qingtian, Liu Zhendong, Yan Jiayong, Tang Jingtian, Wu Mingan and Xiao Xiao
Crustal-scale structure and deformation of Lu-Zong ore district; joint interpretation from integrated geophysical data (in Mining and minerals exploration interpretation, Bob Lo (prefacer), Yaoguo Li (prefacer), Richard S. Smith (prefacer), Jose Arce (prefacer), Mark Shore (prefacer) and Tom Lane (prefacer))
Interpretation (Tulsa) (May 2015) 3 (2): SL39-SL61

Abstract

We have studied five intersecting integrated geophysical profiles for the 3D crustal structure of the Lu (Lujiang)-Zong (Zongyang) ore district to obtain a better understanding of the metallogenesis and provide in-depth information for deep mineral targeting. The profiles, totaling more than 300 km, have reflection seismics and magnetotelluric sounding. Regional gravity surveys were also integrated into this study. New discoveries were obtained regarding the upper crustal structure and deformation based on the integrated analysis of these data. The Lu-Zong ore district consists of four major crustal blocks. They are the Shaxi uplift, Qianshan-Kongcheng Depression (QKD) in the west, Lu-Zong volcanic basin, and the Along-River uplift in the east. The north-south crustal elements show the northward "step-type" uplift, juxtaposed by two steplike faults, the west-northwest/east-southeast-trending Tangjiayuan-Zhuanqiao Fault and the Lujiang-Huangguzha-Tongling Detachment (LHTD) Fault. The Lu-Zong volcanic basin presents a nonsymmetrical shape with four inward-dipping boundary faults. The northern and eastern boundary faults (BF2 and LHTD) are deep faults, which control the development and evolution of the Lu-Zong volcanic basin. There are three west-northwest/east-southeast-trending faults and six northeast-southwest-trending faults cutting over the ore district. From north to south, they are the LHTD Fault, Tangjiayuan-Zhuanqiao Fault, and Yijing-Taojiaxiang Fault (BF3); from west to east, the six faults are the Tan-Lu, Chuhe, Luohe-Quekou, Zongyang-Huangtun, Taojiawan-Shijiawan, and Changjiang Thrust Fault (CTF). The formation and evolution of the ore-district are mainly affected by the Yanshanian intracontinental orogeny, and they experience the Middle to Late Jurassic compression and subsequent Cretaceous extension, possibly due to the paleo-Pacific northwest-trending subduction. Our studies determined that the CTF is a thrust system in nature and the LHTD is a southwest-dipping detachment. Two Jurassic basins were found, surrounding the northeast and southeast of Lu-Zong volcanics, which may be due to the product of postcollision extension of Indosinian orogeny during the middle and early Late Triassic.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 3
Serial Issue: 2
Title: Crustal-scale structure and deformation of Lu-Zong ore district; joint interpretation from integrated geophysical data
Title: Mining and minerals exploration interpretation
Author(s): Lu QingtianLiu ZhendongYan JiayongTang JingtianWu MinganXiao Xiao
Author(s): Lo, Bobprefacer
Author(s): Li, Yaoguoprefacer
Author(s): Smith, Richard S.prefacer
Author(s): Arce, Joseprefacer
Author(s): Shore, Markprefacer
Author(s): Lane, Tomprefacer
Affiliation: Chinese Academy of Geological Sciences, Institute of Mineral Resources, MLR Key Laboratory of Metallogeny and Mineral Assessment, Beijing, China
Affiliation: Colorado School of Mines, Golden, CO, United States
Pages: SL39-SL61
Published: 201505
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 79
Accession Number: 2015-073919
Categories: Economic geology, geology of ore depositsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diags., sects., geol. sketch maps
N29°30'00" - N32°15'00", E115°00'00" - E120°00'00"
Secondary Affiliation: Laurentian University, CAN, CanadaArce Geofisicos, PER, PeruMagma Geosciences, CAN, CanadaCAMIRO, CAN, CanadaCentral South University, CHN, ChinaAnhui Geological Survey, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201532
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