摘要
北祁连地区是华北板块和柴达木—祁连板块的对接地带，是我国一个重要的构造成矿带。其内已发现铜、铅、锌、铬、钨、铁、金、钴、锰等金属矿产地２６０多处。本文是在研究了北祁连地区主要金属矿床的时空分布、含矿层位、成矿期、控矿构造等的基础上，结合北祁连构造演化特征，按照成矿系列的学术思想将区内主要金属矿床划分为９个矿床系列。文中按时代顺序概述了每一成矿系列矿床的基本特征、区域分布、主要成矿地质作用及产出构造环境，并根据对成矿系列的初步研究，总结了北祁连地区区域成矿作用的特点。
The North Qilian is an important tectonic and metallogenic belt in China. So far over 260 metallic ore deposits have been discovered in this area, including copper, zinc, lead, iron, gold, manganese, wolframite and chromite ore deposits, etc. These ore deposits are from early Proterozoic to late early Paleozoic and can be grouped into ten metallogenic series according to their geological environments. Most of the metallogenic series of deposits are related genetically to magmatic intrusions and eruptions. The ore forming materials of the metallogenic series for iron copper deposits in early Proterozoic were derived mainly from volcanics, indicating that the mineral bearing formation be the result of weaking of the primitive crust. The materials of the metallogenic series of chromite, copper, zinc and lead deposites in early Paleozoic came mainly from deep sources, indicating that the tectonomagmatic activition was of great depth. The materials of the metallogenic series of the early Paleozoic sedimentary mineral deposits and the structure altered Hercynian gold deposits were derived from the earlier basic volcanics.The Caledonian was an important metallogenic period when the metallogenetic processes were related to the change of tectonic environments from ocean to continent. There are big metallogenic differences between the eastern and the western part of North Qilian which are demarcated by Menyuan in Qinghai province. The distrbution of deposits was mainly controlled by the spreading rate of the premitive ocean floor in the eastern and western part of North Qilian.Therefore, metallogenesis in the North Qilian area are characterized by inheritance, polyphase, ploysource and polygenesis. The main metallogenic features is similar to that of the Qinling region.
出处
《地球科学进展》
CAS
CSCD
1997年第4期331-339,共9页
Advances in Earth Science
关键词
金属矿床
成矿系列
区域成矿
成矿作用
Ore deposit, Metallogenic series, Regional metallogeny, Qilian area.
