西藏勒青拉铁铅锌矿床成矿模式探讨

A Discussion on the Metallogenic Model of the Leqingla Iron-Lead-Zinc Deposit,Tibet

本文对勒青拉铁铅锌矿床形成的地质背景、矿床地质特征、成矿控矿因素和成矿模式进行了研究。研究结果表明:矿床位于冈底斯成矿带东段北矿带,铁、铅锌矿体主要呈层状产出,严格受碳酸盐岩层位及其层间破碎带的控制,成矿作用与同碰撞期居布札日花岗闪长岩(45Ma)的接触交代作用密切相关;铜铅锌矿体呈脉状产于正断层破碎带中,成矿作用与后碰撞期闪长玢岩(38.8Ma)的岩浆热液充填有关。认为勒青拉矿区深部具有铜多金属矿的找矿潜力,同时对冈底斯成矿带东段北矿带晚碰撞期花岗岩(40～25Ma)成矿作用的重要性应予以重视。

This paper studies geological background, geological features, ore-controlling factors of mineralization and metallogenic model of the Leqingla iron-lead-zinc deposit. The deposit is located in the north ore belt of eastern Gangdise island arc orogenic belt, the iron-lead-zinc ore body is in layered form, and it is strictly controlled by the carbonate rocks and interlaminar fracture zone; the mineralization is closely related to the contact metasomatism of Juhuzari collision granodiorite （45 Ma）; the copper-lead-zinc ore body is in veined form with the normal fault fracture zone, and the mineralization is related to the magmatic hydrothermal filling resulting from late collision of dioritic porphyrite （38.8Ma）; It is concluded that the depth of the Leqingla mine has the potential in search for copper polymetallic ore bodies, and the importance should be attached to mineralization of late collision granite at the north ore belt along the eastern section of the Gangdise metallogenic belt