岩矿测试2013，Vol.32Issue(1)：166-173,8.
黔北大竹园组碎屑锆石年代学及成矿指示意义
Detrital Zircon U-Pb Geochronology of the Dazhuyuan Formation in Northern Guizhou: Implications for Bauxite Mineralization
摘要
Abstract
The Late Carboniferous Dazhuyuan Formation, an important bauxite bearing bed, lies along the Northern Guizhou-Southern Chongqing formation. For tracing the material source of the bauxite, U-Pb dates on detrital zircon of aluminous from Dazhuyuan bauxite deposit using Laser Ablation-Multicollector Inductively Coupled Plasma-Mass Spectrometry ( LA-MC-ICPMS) have been determined. The results show that 84 groups of concordant age are distributed over a wide range, varying from 447 to 2825 Ma, with the main populations ranging from 505 - 660 Ma (n=5), 714-794 Ma (n = 13), 900 -1302 Ma (n=42) and 2473 -2500 Ma (n=5). Compared with the detrital zircon age spectrum of Paleozoic Clastic of South China, the result lacks the data from about 440 - 400 Ma, which belongs to the middle-upper Devonian, more similar to a detrital zircon age spectrum of the Ordovician-Lower Devonian. Combined with the regional geological characteristics, it is postulated that ( 1) the detrital zircons of the aluminous come from the Hanjiadian group (S1hj) , which is the important metallogenic parent rocks of the bauxite. (2) The Caledonian orogeny made the collision between the Cathaysian block and the Yangtze block, implying that the Cathaysia block uplifted rapidly and suffered from erosion in the Silurian, which made a foundation providing a large amount of metallogenic material for the formation of the bauxite.关键词
大竹园组/碎屑锆石/成矿作用/铝土矿/黔北Key words
Dazhuyuan Formation/ detrital zircon/ mineralization/ bauxite/ Northern Guizhou分类
天文与地球科学引用本文复制引用
赵芝,王登红,李沛刚,雷志远..黔北大竹园组碎屑锆石年代学及成矿指示意义[J].岩矿测试,2013,32(1):166-173,8.基金项目
贵州省地质矿产勘查开发局地质科研项目"务川大竹园矿区铝土矿成矿规律与控矿因素研究" （）
中国地质大调查项目"我国重要矿产和区域成矿规律研究"(1212010633903) （1212010633903）
