|Table of Contents|

Metallogenic Regularity and Prospecting Prediction of Fengtai Pb-Zn-Au Ore Concentration Area in Qinling, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2021年第03期
Page:
528-548
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Metallogenic Regularity and Prospecting Prediction of Fengtai Pb-Zn-Au Ore Concentration Area in Qinling, China
Author(s):
WANG Rui-ting1; 2; 3;  ZHANG Ge-li4;  LI Qing-feng1; 2;  ZHANG Bin4;  CHENG Huan1; 2;  JI Yue-fei1; 2
(1. Shaanxi Engineering Technology Research Center of Comprehensive Utilization of Mineral Resources, Xi'an 710054, Shaanxi, China; 2. Northwest Nonferrous Geological and Mining Group Co., Ltd., Xi'an 710054, Shaanxi, China; 3. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 4. Baoji No.717 Corps Limited of Northwest Nonferrous Geological and Mining Group, Baoji 721015, Shaanxi, China)
Keywords:
Pb-Zn deposit;  Au deposit;  metallogenic regularity;  metallogenic model;  prospecting potential;  target prediction;  silica-calcium interface;  Qinling
PACS:
P612; P618
DOI:
10.19814/j.jese.2020.09034
Abstract:
The Fengtai Pb-Zn-Au ore concentration area is located in the western part of Devonian noble metal-polymetallic metallogenic belt, Qinling. The quasi-rhombic tectonic block, which is located between Xiangzihe fracture and Jiudianliang fracture, is composed of NWW-trending folds and NWW-trending faults. The main exposed Devonian is the formation of low-grade metamorphic carbonate rocks and fine clastic rocks. The Huahongshuping and Xiba rock masses, and the concentrated dikes, which are located in the eastern part of the ore concentration area, provide material and thermal power for the Pb-Zn-Au mineralization. The fine analysis of typical deposits show that the Pb-Zn deposits are controlled by regional fractures and anticlinal structures, and occur in specific lithological strata; the physical chemistry conversion interface, which is closely related to Pb-Zn mineralization, is the contact interface(silica-calcium interface)between Middle Devonian Gudaoling Formation and Upper Devonian Xinghongpu Formation; the Pb-Zn deposits are mainly located in the transitional region between planar high magnetic anomaly and low magnetic anomaly, and show Pb-Zn-Hg-Cd geochemical anomalies; the Pb-Zn deposit belongs to strata bound magmatic hydrothermal type; the favorable areas for Pb-Zn ore prospecting are the strike and dip extension of the known ore-bearing anticline, the secondary anticlines with similar ore-forming conditions, the saddle and tilt of deep concealed anticlines in the area with large covered phyllite. The Au deposits, which are controlled by the fracture structural belt or the brittle-ductile shear belt and its superposed position, are located in the transitional region from local high magnetic anomalies to low magnetic anomalies in the high magnetic anomaly belt; besides, the geochemical anomaly of Au deposit is in good agreement with that of Au-Ag-(As-W-Bi-Sb); Au mineralization is closely related to magma activity, and the Au deposit belongs to meso-low temperature magmatic hydrothermal type; the key target area for Au prospecting is near the periphery and deep part of the large-scale Au deposits. The Pb-Zn-Au deposits belong to the metallogenic series of Pb-Zn-Cu-Au related to Indosinian collisional orogeny magmatic post-hydrothermal solution. The Pb-Zn-Au metallogenic model in Fengtai Pb-Zn-Au ore concentration area is established based on the interaction and location of ore-forming geological body, ore-forming structure, ore-forming structural plane and ore body. Superimposed on the geophysical, geochemical, remote sensing abnormal features of typical deposits, a comprehensive information model for ore prospecting and prediction is established. The “weight of evidence method” is used to predict the target areas. There are 6 ore prospecting target areas. It is considered that there is a great potential for ore prospecting in the area. The prospecting emphasis is to predict and explore the concealed ore-controlling structures and concealed ore bodies.

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Last Update: 2021-05-01