乐德矿带成矿系列与成矿规律

乐华—德兴矿带是指江西省内呈NE走向的有色金属和贵金属成矿带,带内有丰富的Cu、Pb、Zn、Au、Ag等矿产资源,其中铜储量约占我国总储量的17.5％。 矿带位于扬子地台南缘关帽山地背斜内,广泛发育中元古代双桥山下亚群和轴向呈EW向或NE向的线状基底褶皱。矿带两侧为断层或地块。矿带内有许多韧性剪切带和燕山期中酸性火成岩,呈NE向分布。 矿带有5个矿田,15个矿床,划分为两个成矿系。是根据其成矿控制因素,矿床物质组分,REE含量,S、Pb、O等稳定同位素,以及黄铁矿中的Co、Ni含量和Co/Ni比值。两个成矿系为:(1)Cu-Pb-Zn-Ag(Au);(2)Au。矿系(1)呈简单的水平分带,矿化与燕山期中酸性岩浆活动有关,而矿系(2)的矿化则与韧性剪切带和晚期断层作用直接有关。

METALLOGENIC SYSTEMS AND PRINCIPLES OF LEHUA-DEXIN ORE BELT

Lehua-Dexin Ore Belt is a non - ferrous and noble metals metallogenic belt with NE-SW trend within Jiangxi province and with abundant mineral resources of Cu,Pb,Zn.Au,Ag.Among them Cu resources are about 17. 5% vs. the total Cu resources in our country. The ore belt is located in Guangmaoshan Anteclise,south margin of Yangtze Platform. It develops extensively in Middle Proterozoic Lower Shuangqiaoshan Subgroup and linear basement folds with nearly E-W or NE-SW axial trend. Both sides of the ore belt arc bound by deep faults or landmass. Within the ore belt .there are a great number of ductile shear zones and Yanshanian intermediate-accidie igneous masses occurring in NE-SW direction. 5 ore fields, 15 deposits and some prospects were classified into 2 mineralization systens based on the study of ore forming controlled factors,material,constitutions of deposits,REE content ,characteristics of S, Pb,O and other stable isotopes and Co,Ni content and Co/Ni ratios in pyrite. The two systems ares (1)Cu-Pb-Zn-Ag(Au) mineralization system,and(2)Au mineralization system. (1) has a single horizontal zoning pattern and the mineralization is related to intermediate-acidic magmatic activties at Yanshanian stage. While in system(2) the mineralizetion is related to ductile shear zone and later faulting directly.