Geological interpretation of Bouguer gravity and aeromagnetic data from the Gobi-desert covered area,Eastern Tianshan,China: Implications for porphyry Cu-Mo polymetallic deposits exploration |
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| Institution: | 1. Earth Science Institute, Slovak Academy of Sciences, 840 05 Bratislava, Slovakia;2. Clermont Université, Université Blaise Pascal, Laboratoire Magmas et Volcans, BP 10448, F-63000 Clermont-Ferrand, France;3. CNRS, UMR6524, LMV, F-63038 Clermont-Ferrand, France;4. IRD, R 163, LMV, Clermont-Ferrand, France;5. Department of Mineralogy and Petrology, Comenius University, 842 15 Bratislava, Slovakia;6. Institute of Geological Sciences, Masaryk University, 611 37 Brno, Czech Republic;7. Matú?kova 11, 831 01 Bratislava, Slovakia;8. Geoafrica Prospecting Services cc, PO Box 24218, Windhoek, Namibia;9. Earth Science Institute, Slovak Academy of Sciences, 917 04 Banská Bystrica, Slovakia;1. CARMA, Centre for Continental Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, China;2. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;3. Faculty of Earth Sciences, China University of Geoscience, Wuhan 430074, China;4. CAS, Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;3. Department of Geology, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7B 5E1, Canada |
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| Abstract: | In this study, Bouguer gravity and aeromagnetic data have been used to better understand the geology and mineral resources near the late Carboniferous-late Permian porphyry Cu-Mo polymetallic mineralization in the Chinese Eastern Tianshan belt, which is extensively covered by Gobi-desert. The reduced-to-pole (RTP) transformation of regional-scale aeromagnetic data shows that the porphyry Cu-Mo deposit is within a cluster of magnetic anomaly highs that overprint on a northeast trending magnetic gradient belt generally along the crustal-scale Kanguertag-Huangshan fault. The 10 km upward continuation transformation of both Bouguer gravity and aeromagnetic data indicates that the known porphyry Cu-Mo polymetallic deposits are located on the flanks of prominent gravity and magnetic anomaly highs. These anomalies are spatially correlated with the late Carboniferous-late Permian igneous rocks and in the Tuwu-Yandong mineralization district are centered over the granodiorite rocks genetically related to porphyry copper systems. In order to minimize interpretational ambiguities, a useful approach that is correlation analysis (CA) based on correlation coefficient (CC) given by gravity and magnetic data was employed to separate positively and negatively correlated anomalies features. The CA procedure is applied to 10 km upward continuation transformation of both Bouguer gravity and RTP transformed aeromagnetic data for mapping correlative magnetization and density contrast anomalies from deep sources, which may be associated with the porphyry Cu-Mo polymetallic mineralization. Five prominent CC positive anomalies have been found in the southern margin of Dananhu-Tousuquan arc. Those anomalies zones could be interpreted to reflect a late Carboniferous-late Permian magmatic belt that is favorable for additional discoveries of late Carboniferous to late Permian porphyry copper systems in north region of Eastern Tianshan. |
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