Control on Lead-zinc Mineralization Through Superimposing Structural Deformation in the Wuzhishan Area in NW Guizhou

doi:10.19657/j.geoscience.1000-8527.2018.04.10

Abstract

Abstract:

The Wuzhishan lead-zinc ore district is located at the junction of Puding and Zhijin in Guizhou Province. The district is tectonically situated at the center of the Yangtze craton, close to the western margin of the Jiangnan orogen. Based on the field structural research, this study found that clear differences between the Sinian-Early Paleozoic and Late Paleozoic-Mesozoic structural deformation features, which were controlled or influenced by the Early Paleozoic Caledonian tectonic movement. The structural line of Sinian-Early Paleozoic is EW-trending, gently EW folded with south- or north-dipping cleavages, which shows the NS-trending compressive deformation. Two sets of NS-and NW-trending high-pitched faults were developed in the Sinian-Early Paleozoic, which were obviously restricted that did not crosscut the post-Late Paleozoic sequences. Sinian-Early Paleozoic interlayer gliding and faulting activities control the distribution of lead-zinc orebodies. Regional tectonic stress field was likely changed after the Late Paleozoic, from early NS-trending compression to early Yanshanian WNW-trending(ESE-dipping) thrusting, which superposed and deformed the Sinian-Early Paleozoic structures, and formed the regional NE-trending tectonic pattern. The late-stage fold axis dips mainly to ESE and the faults thrust to WNW, obliquely superposed on the early deformation. The Yanshanian faulting may have promoted the migration and enrichment of the lead-zinc ores.

Key words: Caledonian deformation, Yanshanian deformation, superposed structure, lead-zinc deposit, Wuzhishan anticline

CLC Number:

P548
P618.2

YANG Xingyu, REN Houzhou, LIU Yu, SHAN Yongbo, YANG Kunguang, AN Qi, LAN Anping, TAN Hua, WU Caijin, XIAO Kai, MO Lulu. Control on Lead-zinc Mineralization Through Superimposing Structural Deformation in the Wuzhishan Area in NW Guizhou[J]. Geoscience, 2018, 32(04): 739-749.

Figures/Tables 9

Fig.1 Simplified geological map of the Wuzhishan anticline and adjacent area

Table 1 Features of the main stratigraphy in the Wuzhishan area

Fig.3 Stereographic projection of stratigraphic formation of the NE section of the Wuzhishan anticline

Fig.4 Simplified geological map of the Jinpo area in Wuzhishan(a)and the Anderson fault model (b)

Fig.5 Field structural features and lead-zinc ore structure in the Wuzhishan area

Fig.2 NW-SE geological cross section of the Wuzhishan anticline and cleavage statistical chart

Fig.6 Fold axial trend and structural superposition pattern in the Wuzhishan-Machang area

Fig.7 Exploration line profiles of the Wuzhishan lead-zinc deposit

Fig.8 Schematic diagram of ore structural control model

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