A new interpretation for the origin of the Norilsk type PGE-Cu-Ni sulfide deposits

The origin of PGE—Cu—Ni sulfide deposits of Norilsk and Talnakh located in the northwest flank of the Triassic basalt trap formation of Siberia is considered.It is shown that ore elements of these deposits（probably,except Fe） are derived from the crust rather than from the mantle.They entered the basalts owing to a remobilization（recycling） of ore elements from the Paleoproterozoic sediments and from the rocks of the Siberian platform＇s basement.Prospecting criteria for similar deposits are as follows：（1） a presence of a large Paleoproterozoic aulacogen and a related magmatic sulfide Cu—Ni mineralization;（2） a confinement of perspective areas to troughs associated with long-lived deep fault zones：（3） association with mobile orogenic belts,island-arc systems and tectonomagmatic activation zones;（4） temporal association with boundaries of global periods characterized by active processes of continental breakup and large-scale trap magmatism.A combination of several factors（the first one is obligatory） is favorable for the discovery of a large ore body.

地球历史中矿产资源分布之规律(英文)

现有的矿产资源分布资料可以说明地球历史中亲铁和亲铜元素成矿的一般规律。铁矿床在元古宙地核分离之后最为发育。除个别显著成矿高峰外 ,金的储量分布与铁类似。亲铁元素矿物的成矿潜力在古元古代也最大 ,以后逐渐降低 ,只是在显生宙 ,因地壳的再循环和古老矿床中矿石物质的活化而再次增大。元素的行为则完全不同 ,在前寒武纪时期它们的活动性为中等。亲铜矿物矿床的总量 ,在显生宙因再循环而达到最高 ,亲铜矿物矿床成矿能力较之亲铁矿物强得多 ,因为硫化物比铁金属氧化物更为活泼。地球演化的旋回性表现为超大陆形成的周期性 ,它与矿产的分布颇为一致。铁矿、亲铁元素和金成矿作用的突然激增 ,显然是在超大陆形成之后 ,并且与其早期裂解的脉动相对应。亲铜元素堆积的高峰期往往与超大陆的形成期相对应。尽管亲铜元素成矿的第三次脉动与中生代古陆 (Mesogea)的形成并不一致 ,但却与劳亚古陆及冈瓦纳古陆的裂解相一致。此种成矿堆积现象可以借助地幔内非稳态化学密度对流所诱发的地壳发展周期性来解释。根据超大陆形成的周期性推断地幔对流巨旋回的主期应为 80 0Ma ,此种周期性亦反映了具原始地幔印记的亲铁、金和亲铜元素的聚集作用过程。因此 。