扬子陆块东南缘早南华世大塘坡早期岩相古地理及锰矿床地质意义

扬子陆块东南缘是我国南华纪"大塘坡式"沉积型锰矿的重要富集区,锰矿层赋存在早南华世大塘坡组早期炭质页岩中。该成锰期前,南华裂谷盆地自北向南总体地势西高东低、北高南低,古环境表现出滨浅海→浅海→次深海→深海。含锰岩系沉积物以低能、悬浮、低速率沉积为特征的黑色炭质页岩、炭质粘土岩夹菱锰矿沉积组合,发育两类含锰沉积岩相组合:浅水陆棚、深水陆棚,以局限深水棚内槽盆为菱锰矿的主要富集相。

Geological Significance of Early Lithofacies Palaeogeography and Manganese Deposits of Datangpo Early South China in the Southeast Margin of Changjiang Block

The southeast margin of Changjiang block is an important enrichment area of Nanhua quot.It is Datangpo-type quot and sedimentary manganese ore in China.Prior to the manganese formation period,the South China rift valley basin is from north to south overall terrain west high east low.It is north high south low and the ancient environment that shows shallow sea,including shallow sea and sub-deep sea.Two types of manganese-bearing sedimentary lithofacies are developed in shallow water shelf and deep water shelf.The basin in the restricted deep-water shelf is the main enrichment facies of rhodochrosite.