云南金顶铅锌矿床云龙组内碳酸盐岩构造岩片的演化与成矿系统探讨  

Evolution and Metallogenic System of Carbonate Tectonic Slices in the Unryu Formation of Jinding Pb-Zn Deposit, Yunnan Province

作　　者：张金学 罗洪昌 梅朴莲 杨元珍 

机构地区：[1]云南省有色地质局三一〇队,云南 大理 [2]云南金鼎锌业有限公司,云南 兰坪

出　　处：《地球科学前沿（汉斯）》2021年第3期257-269,共13页Advances in Geosciences

摘　　要：笔者以金顶铅锌矿床古新统云龙组内“碳酸盐岩构造岩片”为主要对象,从的成矿构造地质背景、矿区推覆造系统和穹窿构造系统的演化以及相伴的成矿系统等方面论述了矿床的复合成矿过程。提出金顶铅锌矿床云龙组内碳酸盐岩系是始新世由推覆楔入的三叠系上统三合洞组碳酸盐岩构造岩片,经复合造山作用演化的不同阶段形成不同类型、不同成因的角砾岩构造组合。在矿区逆冲推覆构造系统演化过程中三合洞组灰岩为能干岩层,前锋带容易形成“楔状岩片”楔入到云龙组非能干岩层中。晚渐新世–中新世兰坪盆地转入走滑拉分盆地演化阶段,在大规模的剪切走滑背景下伴随南北向挤压推覆以及盐丘底辟作用,推覆系组与原地系组融合形成穹窿构造系统,云龙组内碳酸盐岩构造岩片再次应变,并经过膏溶坍塌、砂岩灌入体和水力压裂构造等作用的叠加改造复合成矿,主要矿化样式叠加有推覆构造型、盐丘构造型、层间断裂带热液脉型等。金顶铅锌矿床云龙组内碳酸盐岩角砾岩为经推覆构造→穹窿构造→膏溶构造→后期岩溶改造等形成的一套特殊多成因角砾岩组合。The main object of this paper is “carbonate tectonic slices” in the Palaeocene Yunlong formation of the Jinding lead-zinc deposit, the complex mineralization process of the deposit is discussed in terms of its tectonic setting, the evolution of nappe system and Dome Structure System, and the associated metallogenic system. It is suggested that the carbonate rocks in the Unryu formation of the Jinding lead-zinc deposit are tectonic slices of carbonate rocks in the upper triassicSandong formation of the Eocene, wedged by NAPPE, bRECCIA tectonic assemblages of different types and origins were formed in different stages of the evolution of composite orogeny. During the evolution of the thrust nappe structural system in the mining area, the limestone of the Sanhe Cave formation is a capable rock stratum, and the front zone is easy to form “wedge-shaped rock slices” and wedge into the non-capable rock stratum of the Unryu formation. The late oligocene-miocene Lanping Bai and Pumi Autonomous County basin turned into a strike-slip pull-apart basin evolution stage, accompanied by north-south compressional Nappe and Salt Dome diapir under the large-scale Shear strike-slip background, the tectonic slices of carbonate rock in Yunlong formation are re-strained, and the composite ore-formation is formed by superimposition and reformation of gypsum solution collapse, sandstone infilling body and hydraulic fracturing structure, the main mineralization styles superimposed are nappe structure, Salt Dome Structure, interlayer Fault Zone hydrothermal vein type and so on. The carbonate Breccia in the Unryu formation of Jinding lead-zinc deposit is a set of special multi-genetic breccia assemblage formed by nappe structure, dome structure, gypsum dissolution structure and later karstification.

关 键 词：成矿系统 构造演化 碳酸盐岩构造岩片 云龙组 金顶铅锌矿床 

分 类 号：P61[天文地球—矿床学]