【摘要】：VMS和BIF鐵礦作為兩種重要的礦床類型,在前寒武紀常常以共生組合方式賦存于古老克拉通內的表殼巖系中,是早期地球構造和環(huán)境演化耦合作用的產物。該組合不僅記錄了當時特定的構造及大氣和海洋環(huán)境,而且兩者也是全球銅、鐵、鉛、鋅等金屬的重要來源,因此,開展VMS與BIF共生組合的研究具有重大科學價值和經濟意義。前人研究表明,前寒武紀VMS與BIF集中出現于~2.7 Ga和~1.9 Ga,與同時期地幔柱活動和地殼增生的高峰相對應,兩者共生時BIF通常產出于VMS外圍或上盤,但在礦體空間展布上具有此消彼長的關系;研究還認為,前寒武紀地幔柱活動誘發(fā)的海底擴張、海底和地表強烈的火山活動形成的多重熱液系統(tǒng),可同時為VMS和BIF提供物質來源,海水的硫逸度、氧逸度及大氣的氧含量是影響VMS與BIF空間分布及VMS硫同位素組成的重要因素。目前,VMS與BIF共生組合研究取得了較大進展,但仍存在一些問題:缺乏典型共生實例的精細解剖,已有共生模型缺乏詳細的礦床成因機制研究支撐,對兩者共生組合產出的構造背景和古海洋環(huán)境仍存在不同認識。華北克拉通的清原和五臺新太古代綠巖帶發(fā)育有較大規(guī)模的VMS與BIF鐵礦共生現象,對其開展詳細研究工作將為解決上述問題提供借鑒。
[Abstract]:As two important ore deposit types, VMS and BIF iron ore deposits occurred in a symbiotic assemblage in the Precambrian in the ancient cratonic crust rock series, which is the product of the coupling of early tectonic and environmental evolution. The combination not only recorded the specific tectonic and atmospheric and marine environments at that time, but also was an important source of copper, iron, lead, zinc and other metals in the world. Therefore, it is of great scientific value and economic significance to study the symbiotic association of VMS and BIF. Previous studies have shown that the Precambrian VMS and BIF concentrations occurred in the Precambrian region of 2.7 Ga and 1. 9 Ga, corresponding to the peak of mantle plume activity and crustal accretion in the same period, and that BIF usually occurred in the outer or upper disk of VMS when they were symbiotic. However, the spatial distribution of the orebodies is related to each other, and it is also believed that the Precambrian mantle plume induced undersea expansion, the strong volcanic activity on the sea floor and the surface of the earth formed multiple hydrothermal systems, The sulfur fugacity, oxygen fugacity and atmospheric oxygen content of seawater are important factors affecting the spatial distribution of VMS and BIF and the composition of VMS sulfur isotope. At present, great progress has been made in the study of BIF symbiotic assemblage, but there are still some problems, such as the lack of fine anatomy of typical symbiotic examples, and the lack of detailed research support on the genetic mechanism of ore deposits in the existing symbiotic models. The tectonic background and paleo-marine environment of the symbiotic assemblage are still different. In the Qingyuan and Wutai NeoArchean greenstone belts of North China Craton there is a large scale symbiosis between VMS and BIF iron ore. The detailed research work will provide reference for solving the above problems.
【作者單位】： 中國科學院礦產資源研究重點實驗室中國科學院地質與地球物理研究所;中國科學院大學地球科學學院;中國有色集團撫順紅透山礦業(yè)有限公司;中國地質大學地球科學與資源學院;
【基金】：國家自然科學基金項目“晚太古代清原綠巖帶BIF與VMS礦床的成因聯系及沉積環(huán)境”(批準號:41572076) “973”項目“華北克拉通前寒武紀重大地質事件與成礦”(批準號:2012CB416601)聯合資助
【分類號】：P618.31

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