首页|A Novel Three-stage Tectonic Model for Mississippi Valley-type Zn-Pb Deposits in Orogenic Fold-and-Thrust Belts

A Novel Three-stage Tectonic Model for Mississippi Valley-type Zn-Pb Deposits in Orogenic Fold-and-Thrust Belts

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Mississippi Valley-type(MVT)Zn-Pb deposits predominantly form within both orogenic forelands and fold-and-thrust belts,yet the mineralization process within the latter tectonic setting remains inadequately understood.This study,through a comprehensive review of MVT deposits across global fold-and-thrust belts,introduces a novel model elucidating the mineralization process in the context of tectonic belt evolution.It is demonstrated that during the stage I,regional compression is introduced by early stages of plate convergence,causing the folding and thrusting and creating structural or lithological traps such as evaporite diapirs and unconformity-related carbonate dissolution-collapse structures.Thereafter,in stage Ⅱ,hydrocarbons begin to migrate and accumulate within these traps,where reduced sulfur is generated through thermochemical or bacterial sulfate reduction concurrent with or preceding Zn-Pb mineralization.In the subsequent stageⅢ,as plate convergence persists,the regional stress transitions from compression to transpression or extension.Under these conditions,steeply-dipping extensional faults are generated,facilitating the ascent of metalliferous brines into early-formed structural or lithological traps.Precipitation of Zn and Pb sulfides occurs through the mixing of Zn-Pb-transporting fluids with pre-existing reduced sulfur or by interaction with hydrocarbons.

Mississippi Valley-type Zn-Pb depositsfold-and-thrust beltstectonic modelstructural or lithological trapsextensional faults

SONG Yucai

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SinoProbe Laboratory,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

4212520492155305421030684237211442372115

2024

10.1111/1755-6724.15200

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(4)