略阳白雀寺杂岩体以西隐伏深大断裂的推断依据及其意义

doi:10.11720/wtyht.2021.1163

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Abstract

Mianluening area is one of the most complex areas of geological structure around the Yangtze plate. Based on the comparative study of the high magnetic anomaly zone to the west of Baiquesi basic complex, the regional gravity anomaly gradient zone and the geochemical anomalies of Fe, V, Ti and other elements, combined with the geochemical characteristics of the overflow phase basalts distributed along the anomaly zone, it is inferred that there may be a larger hidden fault in the deep part of the NNE-trending shallow faults interpreted by surface remote sensing. This hidden deep fault may have provide an important channel for the mantle-derived magmatic activity in the context of post arc cracking in Mianluening area in the Neoproterozoic. On the one hand, the Baiquesi basic complex and igneous carbonatite were formed by the intrusion of the plutonic magma; on the other hand, the belt like overflow phase basalt rich in magnetite was formed by the fissure type volcanic eruption. This finding is of great significance for the study of Neoproterozoic tectonic setting and mantle-derived magmatic mineralization in Mianluening area.

Key words： gravity ground high precision magnetic survey petrogeochemistry hidden deep fault Baiquesi complex

Received: 09 April 2020 Published: 27 July 2021

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	Articles by authors
	Jun YOU
	Xiao-Ming ZHANG
	Qian-Zhou LOU
	Zhao-Yang SHI
	Yun-Jun YANG
	Jian-Xiang CHEN
	Pan YUAN

Cite this article:

Jun YOU,Xiao-Ming ZHANG,Qian-Zhou LOU, et al. The inferential basis and significance of the deep fault to the west of the Baiquesi complex in Lueyan[J]. Geophysical and Geochemical Exploration, 2021, 45(3): 645-652.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1163 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I3/645

Geological-tectonic maps of eastern Bikou block (b)and western Mian-Lue-Ning area(a) (modified after Reference 11 and 12)

The basalts rich of magnetite (a) and intrusive igneous carbonatite lens (b) in the area where the inferred hidden deep fault stretch

Major and mirco-elements content in baslts

Spider (a) and Zr-Zr/Y (b) diagrams of basalt in the area where the inferred hidden deep fault stretch

Maps of ground high precision magnetic survey and inferential interpretation for faults in western Mian-Lue-Ning area
a—ΔT isoline; b—500 m upward ΔT isoline;c—reduction to the pole of ΔT and inferred faults; d—reduction to the pole in 0° direction of horizontal first order ΔT and inferred faults; e—reduction to the pole in vertical first order ΔT and inferred faults;f—location of inferred faults by combined magnetic methods

The No.P14 Δ T section map of ground high precision magnetic survey

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1:500 000 contour map of regional gravity in eastern Bikou (modified after reference [13])

Geochemical maps of Ti(a), Fe₂O₃(b) and V(c) in western Mian-Lue-Ning area

Map of remote sensing interpretation in western Mian-Lue-Ning area

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