广西南丹-河池锡-多金属成矿带的特征

南丹-河池锡-多金属成矿带(以下简称丹池成矿带),分布于广西壮族自治区西北部南丹至河池一带,呈北西走向的弯月形,长170公里,宽20—35公里。带内蕴藏着非常丰富的金属矿产资源(图1),无论从有用矿产的种类,还是从矿产的储藏量而言,它都是一个难得的“聚宝盆”。

THE CHARACTERISTICS OF NANDAN-HECHI TIN-MULTIMETALIC ORE-FORMING BELT, GUANGXI

Tin-multinietalic deposits belt is the most important ore-forming belt in Grangxi, It contains aburdant metal mineral products, such as Sn, Zn, Pb, Sb and Hg, etc.. The main ore-forming features can be summarized as follows: (1) In sedimentary process of late Paleozoic period, the region of ore belt was an elangate narrow trough controlled by basement, profitable for preliminary enrichment of ore-forming materials to form ore resource or ore-bearing bed, along the local high position where reef was developed, the ore-forming materials in the stratum were more enriched by biogenic agency and biochemical process, (2) The ore-forming belt is situated in the transitional zone between Yantze platform and Caledonian geosyncline in South China. The various ore-forming materials of basement migrated from the long term active fracture zone from Nandan to Hechi, participating in the ore-forming actions. (3) During Yensha-nian period, the granitic magma containing tinmultimetalic elements intruded along the anticlines and the ore zone concentrated the materials derived from the country rocks, basement and granites themselves, forming magmatic hydrothermal deposits and sedi-mentary-Supperimposed deposits. (4) The ore belt itself is one depression folding zone with slighter erosion. Therefore, the granites as the centers of ore-forming actions and the ore bodies around them, were preserved perfectly.