西藏古堆地区成矿系列、成矿谱系研究及其找矿意义

A study of minerogenetic series and metallogenic lineage of Gudui area in Tibet and their implications for prospection

西藏古堆地区属于北喜马拉雅成矿亚带,该区发育有大量金锑铅锌多金属矿床点。文章运用矿床成矿系列的理论和方法对古堆地区进行矿床成矿系列和成矿谱系研究。初步厘定了4个矿床系列9个亚系列,以典型矿床地质特征分析为基础,将各成矿系列在区域内的演化归结为成矿谱系。指出本区古近纪和新近纪成矿作用强烈,以与大陆碰撞逆冲推覆作用有关的金锑多金属矿和与大陆碰撞伸展拆离作用有关的铅锌锑多金属矿的大量发育为特征。成矿系列划分在金锑铅锌矿产勘查实践中取得了新的找矿突破,这对深入研究区域成矿规律,指导矿产勘查工作具有重要意义。

A large number of Au-Sb-Pb-Zn polymetallic deposits and mineral occurrences develop in Gudui are- a of Tibet which is located in the north Himalayan metallogenic sub-zone. This paper applied the theories and methods of minerogenetic series in the study of the minerogenetic series and metallogenic lineage of Gudui ar- ea. The authors initially divided the mineralization in Gudui area into 4 minerogenetic series and 9 mineroge- netic sub-series. Based on the analysis on geological characteristics of typical deposits, the evolution of vari- ous minerogenetic series in the area was ascribed to metallogenic lineage. The conclusion indicated that the mineralization of the area in Paleogene and Neogene period was intense, and the area was characterized by a large amount of development of Au-Sb polymetallic deposits and Pb-Zn-Sb polymetallic deposits which were respectively related to continental collision-thrusting and continental collision/extensional detachment. Based on the division of the metallogenic series, new breakthrough was made in the mineral exploration practice of gold, antimony, lead and zinc. The division of the metallogenic series has important implications for the study on the regional minerogenetic regularity and the guidance of the mineral exploration works.