关于新疆乌恰盆地中新生代砂岩型铅锌铜铀层次成矿问题浅析

回顾乌恰构造拉分盆地的地史发展与构造演化,厘定出白垩纪-新近纪碎屑岩沉积盆地;建立起层次性砂岩型铅锌铜铀矿成矿系列,划分出白垩世早期河流边滩相沉积铜银矿、早-中期平原三角洲相沉积铀矿、晚白垩世早-中期海相-亚陆相沉积铅锌矿及新近纪早中期残留湖相沉积铜银矿和上部层中钼铀矿五个含矿层位,指出海侵前和海退后是陆相砂岩型铜银铀矿的成矿环境,而海相建造系列的亚陆相沉积建造是铅锌赋存的古地理条件;并从大地构造背景、古地理演化环境、控矿构造性状、物源及其他有关成矿因素进行粗浅的综合与讨论。

Discussion of the stratified mineralization of Pb-Zn-Cu-U deposit of mesozoic-cenozoic sand type in Wuqia basin, Xinjiang

On the study of the geohistory development and structural evolution of Wuqia structural taphrogeny basin,it makes out the clastic Mesozoic-Cenozoic geobasin. It also sets up the metallogenic series of Pb-Zn-Cu-U deposits of stratified sand type,which can be further divided into stream-swamp-face Cu-Ag deposit in early cretaceous,plain delta sedimentary U deposit in early-middle Cretaceous sediment,Pb-Zn deposit of sea-face and subterrestrial face in early-middle phase of late Cretaceous,the sedimentary Cu-Ag deposit of early-middle Eocene and Mo-U deposits of the upper layer. It can be indicated that Cu-Ag-U deposits of the continental-face sand type are being metallogenic envinonment of before transgression and behind regression. The sedimentary sub-continental-face formation of sea-face formation series is the paleo-geography condition of Pb-Zn deposits. The paper has discussed with respect to the tectonic setting,paleo-geography evolution environment,characteristics of ore-controlling structure,material source and other ore-forming factor.