阿拉善右旗特拜金矿赋矿地层时代厘定及其地质意义

doi:10.13278/j.cnki.jjuese.20180213

摘要/Abstract

摘要： 本文对阿拉善右旗特拜金矿的赋矿地层进行了LA-ICP-MS锆石U-Pb测年，获得最年轻碎屑锆石的谐和年龄集中在525~461 Ma之间，峰期年龄为（473±3）Ma，限定了该套地层的最大沉积年龄为中奥陶世。结合区域上呈断层接触的石炭纪本巴图组、大量侵位的早二叠世花岗岩，将赋矿地层时代大致限定为中奥陶世-早二叠世，而不是前人认为的中-新元古代。物源分析表明，古元古代-奥陶纪碎屑锆石最可能来自阿拉善地块变质基底和同造山陆缘岩浆弧，这套赋矿地层可能形成于奥陶纪早期俯冲的弧前盆地背景，与中亚造山事件密切相关。

关键词: 阿拉善地块, 特拜金矿, 赋矿地层, 碎屑锆石, U-Pb年龄

Abstract: In this research, the detrital zircon LA-ICP-MS U-Pb from the ore-hosting strata of gold deposits is studied in Alxa Tebai area. The concordant age of the youngest detrital zircons is concentrated in 525-461 Ma with the peak age of (473±3) Ma. The maximum sedimentary age of this set of strata is around the Middle Ordovician. Considering the Carboniferous Bembatu Formation, combined with the regional fault contacts and the massive emplaced Early Permian granites, the age of ore-bearing strata is roughly limited to the Middle Ordovician-Early Permian, rather than the Mesoproterozoic-Neoproterozoic as thought by predecessors. The source analysis shows that these Paleoproterozoic-Ordovician clastic zircons are most likely derived from the metamorphic basement of the Alxa massif and the magmatic arc of the syn-orogenic continental margin. The ore-bearing strata may have been formed in the background of the early subduction of Ordovician fore-arc basins, which is closely related to the Central Asian orogenic event.

Key words: Alxa block, Tebai gold deposit, ore-hosting strata, detrital zircon, U-Pb age

中图分类号:

P536

程先钰, 李以科, 董满华, 曹侃. 阿拉善右旗特拜金矿赋矿地层时代厘定及其地质意义[J]. 吉林大学学报(地球科学版), 2019, 49(6): 1565-1577.

Cheng Xianyu, Li Yike, Dong Manhua, Cao Kan. Age and Geological Significance of Ore-Bearing Strata of Tebai Gold Deposit in Alxa Right Banner Area[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1565-1577.

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