Xiaohongshilazi Pb–Zn–(Ag) deposit, Panshi City, Jilin, Jilin, Chinai

Regional Level Types
Xiaohongshilazi Pb–Zn–(Ag) deposit	Deposit
Panshi City	City
Jilin	Prefecture-level City
Jilin	Province
China	Country

The granodiorite porphyry (203.6 ± 1.8 Ma, U–Pb zircon) within the internal Pb–Zn mineralization cut the diorite porphyry (225.6 ± 5.1 Ma, U–Pb zircon), and was closely associated with the vein-type Pb–Zn–(Ag) mineralization of the Xiaohongshilazi deposit (195 ± 17 Ma; sulfide Rb–Sr dating).
Forty-one Pb–Zn–(Ag) orebodies in the ore district were categorized into layered orebodies (n = 19) and vein-type orebodies (n = 22). The layered Pb–Zn orebodies that were mainly hosted within and spatially dominated by volcanic rocks were cut by vein-type Pb–Zn–(Ag) orebodies, which had lengths of 100–400 m, depths of 110–280 m, and thicknesses of 1–3 m in the ore district. In addition, the ore fabrics, mineral assemblages, and wall-rock alteration showed obvious differences between the layered and vein-type ores. Layered ore occurred mainly as a banded structure, and the vein-type ore displayed a vein structure.

The Xiaohongshilazi deposit is a unique medium-scale Pb-Zn-(Ag) deposit (Reserve: ∼35,000 t of Pb, ∼100,000 t of Zn, ∼158 t of Ag) identified in the Jizhong district. From the Paleozoic to the Cenozoic, the deposition of regional strata in the JYMB occurred in five periods: (1) The Cambrian–Ordovician strata mainly consist of greenschist to low-amphibolite facies metamorphic rocks, interspersed with thick marble formations such as the Xibaoan (Є–Oxb) and Huangyingtun (Є–Ohy) formations. (2) The Silurian–Devonian strata primarily comprise marine flysch and carbonates, including the Taoshan (S1t), and Wangjiajie (D1–2w) formations. (3) The Carboniferous–Permian strata principally comprise shallow marine carbonates, land-derived clastic rocks, and intermediate-acidic volcanic rocks, such as the Luquantun (C1l), Shizuizi (C3sh), Shoushangu (P1sh), and Daheshen (P1d) formations, which are the main ore-hosting strata. (4) The Triassic to Jurassic period is characterized by continental facies volcanic rocks, represented by the Lujiatun (T1l), Dajianggang (T3d), and Nanloushan (J1n) formations. While (5) the Cenozoic strata are predominantly composed of Quaternary sediments deposited along the valley bases and riverbanks. The orebodies are hosted in marine volcaniclastic sediments of the Daheshen Formation (P1d), characterized by tuffaceous slate, andesitic tuff, andesitic breccia, dacitic tuff, dacitic breccia, rhyolitic tuff, rhyolitic breccia, and limestone. The Xiaohongshilazi deposit comprises two ore blocks at the current exploration level, eastern and western, located approximately 250 m apart.

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References