作　　者： ; ; (陆建军）;

机构地区： 南京大学地球科学与工程学院地球环境计算工程研究所

出　　处： 《矿床地质》 1996年第1期80-86,共7页

摘　　要： 对产在不同地区、具不同岩性、且与不同金属矿化有关的煌斑岩金含量分析表明,煌斑岩原始的金含量一般都不高;Rock等人提出的高金含量是煌斑岩的固有特征及有关煌斑岩与金矿化新成因模式的立论依据尚欠充分。 Gold content was determined for lamprophyre sills which occur in the auriferous granites in Jiaodong area, uraniferous granites in South China, and barren granites in Ningzhen area of Jiangsu Province by atomic absorption spectrometry whose detection limit is higher than 10^(-11). The analyses show that the gold contents of lamprophyres is not higher than that of common igneous rocks and there exist no obvious differences among various types of lamprophyres in different areas, with the average gold abundance varying around 2.5×10^(-9) which is at least one order of magnitude lower than the value presented by Rock et al. Therefore, it seems quite impossible for lamprophyres to play a ubiquitous role in providing materials for gold mineralization, and thus the new genetic model for lamprophyres and gold mineralization advanced by Rock et al. cannot hold water. The relatively high gold content of some lamprophyres seems attributed mainly to the superimposition of late metamorphism and is not the intrinsic character of these rocks. It has no direct relationship with the anomalous mantle either. Factors such as tectonic conditions required for emplacement of lamprophyres, interface effect between lamprophyres and wall rocks, rich volatiles in lamprophyres and 'heating engine function' of lamprophyre emplacement account for common coexistence between lamprophyres and gold mineralization; nevertheless, lamprophyres are not necessarily associated with gold mineralization.

关 键 词： 煌斑岩 金矿床 矿化 成因模式

领　　域： [天文地球] [天文地球]