安徽铜陵—繁昌地区深部成岩成矿作用探讨——来自综合地球物理探测的制约

doi:10.11720/wtyht.2021.1533

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Abstract

In the Middle-Lower Yangtze River metallogenic belt, the possibility of the development of copper-gold mineralization similar to things of the fault-uplift area in the depth of volcanic basin has attracted extensive attention. Based on the geophysical profile through the Tongling fault-uplift area and Fanchang volcanic basin and using integrated geophysical exploration methods, the authors identified the deep geological structure, rock and ore-controlling structure and the distribution of intrusions. The comparative study shows that the lithology, height and distribution of intrusions are different in Tongling and Fanchang area, and the intrusions in Fanchang is more felsic and shallow than those in Tongling. The faults in Tongling area only control the shallow location of intrusions, while the boundary faults in Fanchang basin are the channels for magma rising. The intrusion in Tongling area is characterized by "one mother and multiple offspring" and different intrusive branches or strains derived from the same magma chamber, which directly proves that different types of intrusive rocks in Tongling area are the products of the evolution of the same magma source region, and different degrees of evolution may be one of the reasons for their different kinds of mineralization. In this study, the authors used integrated geophysical exploration methods to discuss the difference of diagenesis and mineralization between Tongling fault-uplift area and Fanchang volcanic basin and explain the reason why only small iron mineralization exists in Fanchang region while large copper (-gold) deposit occurs in Tongling region. In addition, large-scale intrusion of granitic magma in the depth of Fanchang region indicates that there is no "second Tongling" in the depth of the Fanchang volcanic basin. These results further deepen the understanding of the regularity of copper and iron mineralization in the Middle and Lower Yangtze River metallogenic belt and provide theoretical support for ore prospecting and exploration in the future.

Key words： Tongling fault-uplift area Fanchang volcanic basin integrated geophysical exploration rock and ore-controlling structure deep geological structure

Received: 23 November 2020 Published: 27 July 2021

ZTFLH:

P631

Corresponding Authors: LAN Xue-Yi E-mail: kcjsywyy@126.com;lanxueyi@126.com

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	Yun-Yun WANG
	Xue-Yi LAN
	Dong GUO
	Sha-Sha ZHANG
	Wen-Xiang DING
	Long TAO
	Hui-Jie ZHANG
	Yuan-Yuan ZHANG
	Lin YE
	Miao YOU

Cite this article:

Yun-Yun WANG,Xue-Yi LAN,Dong GUO, et al. Diagenesis and mineralization in Tongling and Fanchang areas, Anhui Province: Constrains from the integrated geophysical exploration study[J]. Geophysical and Geochemical Exploration, 2021, 45(3): 590-600.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1533 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I3/590

Location magnetotelluric measurement points and seismic section in the Tongling-Fanchang geological map
1—Quaternary;2—Cretaceous;3—Triasic;4—Permian;5—Carboniferous;6—Devonian;7—Silurian;8—volacanic rock;9—diorite;10—granite;11—trachylotic andesitic porphyry;12—granitic porphyry;13—syenitic porphyry;14—dioritic porphyry dyke;15—diabase prophyry dyke;16—fault;17—inferred main faults;18—location of No.1 line and MT section;19—location of the collected seismic section

Physical properties of rocks in Tongling and Fanchang

Bouguer gravity anomaly map (a) and aeromagnetic anomalies after reducing to the pore (b) in Tongling-Fanchang region

24]
1—main fault; 2—fault; 3—lower boundary of the Cretaceous basin; 4—normal fault; 5—reverse fault; 6—the detachment between basement and overlying strata; 7—the detachment between middle and lower crust; Pt—Proterozoic strata; Pz—Paleozoic strata; K-R—Cretaceous to Neogene
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Reflection seismic profile No. TL11-05 line in the Tongling-Fanchang region(Modified after Lyu et al., 2012)^[24]
1—main fault; 2—fault; 3—lower boundary of the Cretaceous basin; 4—normal fault; 5—reverse fault; 6—the detachment between basement and overlying strata; 7—the detachment between middle and lower crust; Pt—Proterozoic strata; Pz—Paleozoic strata; K-R—Cretaceous to Neogene

Geological-geophysical synthesized model of No. 1 section in Tongling and Fanchang region
1—Quaternary; 2—upper Cretaceous Chishan formation; 3—lower Cretaceous Kedoushan formation; 4—lower Cretaceous Chisha formation; 5—lower Cretaceous Zhongfencun formation; 6—Triassic; 7—Upper-middle Permian; 8—lower Carboniferous-Permian; 9—Devonian-lower Silurian Gaojiabian formation; 10—Ordovician-Cambrian; 11—granodiorite; 12—granite; 13—granitic porphyry; 14—granodioritic porphyry; 15—inferred high-density body; 16—reverse fault; 17—normal fault

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