应该重视华北地台与偏碱性杂岩有关的金矿床成矿理论研究和找矿勘探

ON THE METALL0GENETIC STUDY AND PR0SPECTINGOF GOLD DEPOSITS RELATED TO SUB-ALKALINEIGNEOUS COMPLEXES OF THE NORTR CHINA PLATFORM

一、问题的提出十年代以来,我国地质工作者无论在金矿床地质理论研究,还是在找矿勘探方面均取得了前所未有的成绩和进展.尽管如此,我国黄金人均占有量仍然只有0.0019公斤,远低于世界人均水准(0.01公斤).黄金产量远不能满足国民经济建设的需要,主要表现在:1.大型和超大型金矿床太少;2.勘查后备基地严重不足:3.一大批老矿山面临着“找米下锅”或“等米下锅”的局面;4.找矿难度愈来愈大.

AbstractThe recent discovery of Dongping, Wulashan, Shuangwang and Ertaizhi deposits indicates a breakthrough of a new type gold deposits in China. Occurring along the marginal deep-seated faults of North China Platform. All these four gold deposits are spatially and temporally related to monzonite-synite complex, synite dyke swarms , and albitite and albitized breccia formed during the Heyncian\ | Yanshanian orogeny. Gold is contained primarily in quartz-K-feldspar (or K-feldspar vein)and albitite lenses. Results from recent and ongoing studies show a direct link between gold metallogenesis and the volatile-rich, mafic, sub-alkalic magma. The sub-alkalic igneous complex is widely distributed within the North China Platform and its marginal deep-seated faults due to oblique subduction of the Pacific plate against the Eurasian plate. Emphasis should be placed on sub-alkalic igneous complex and related gold mineralization during metallogenic study and mineral exploration.