Economou-Eliopoulos M, Eliopoulos D G
Department of Geology, National University of Athens, Greece.
J Environ Pathol Toxicol Oncol. 1998;17(3-4):199-204.
Several deposits of sulfide mineralization have been described in the ophiolites of Greece. Based on their mineralogical and chemical composition and the host rocks, two types can be distinguished: (1) the Fe-Cu-Ni-Co type consisting of pyrrhotite, chalcopyrite, Co-pentlandite, pyrite, magnetite + arsenides, +/- chromite, hosted in serpentinites, gabbros or diabases, which have variable geochemical characteristics, and (2) sulfide mineralization of the Cyprus type containing variable proportions of pyrite, chalcopyrite, bornite, and sphalerite. The spatial association with shear zones and fault systems, which is a common feature in both types of mineralization, provided the necessary permeability for the circulation of the responsible mineralized hydrothermal fluids. The selenium (Se) content in representative samples of both types of mineralization from the ophiolites of Pindos (Kondro, Perivoli, and Neropriona), Othrys (Eretria and A. Theodoroi), Veria (Trilofon), and Argolis (Ermioni) shows a wide variation. The highest values of Se (130 to 1900 ppm) were found in massive Fe-Cu sulfide ores from Kondro, in particular the Cu-rich portions (average 1300 ppm Se). The average values of Se for the Othrys sulfides are low (< 40 ppm Se). The Se content in a diabase breccia pipe (50 x 200 m) with disseminated pyrite mineralization (Neropriona) ranges from < 1 to 35 ppm Se. The highest values were noted in strongly altered samples that also exhibited a significant enrichment in platinum (1 ppm Pt). Sulfide mineralization (irregular to lens-like masses and stringers) associated with magnetite, hosted in gabbros exposed in the Perivoli area (Tsouma hill), shows a content ranging from 40 to 350 ppm Se. The distribution of Se in the studied type of the sulfide mineralization may be of genetic significance, indicating that the Se level, which often is much higher than in typical magmatic sulfides related to mafic-ultramafic rocks (average 90-100 ppm Se), may positively affect the environment.
希腊蛇绿岩中已描述了多处硫化物矿化矿床。根据其矿物学和化学成分以及寄主岩石，可区分出两种类型：（1）铁-铜-镍-钴型，由磁黄铁矿、黄铜矿、钴镍黄铁矿、黄铁矿、磁铁矿+砷化物、+/-铬铁矿组成，赋存于蛇纹岩、辉长岩或辉绿岩中，这些岩石具有可变的地球化学特征；（2）塞浦路斯型硫化物矿化，含有不同比例的黄铁矿、黄铜矿、斑铜矿和闪锌矿。与剪切带和断层系统的空间关联是两种矿化类型的共同特征，为成矿热液流体的循环提供了必要的渗透率。来自品都斯（孔德罗、佩里沃利和内罗普里奥纳）、奥瑟里斯（埃雷特里亚和A. 西奥多罗伊）、韦里亚（特里洛丰）和阿尔戈利斯（埃尔米奥尼）蛇绿岩的两种矿化类型代表性样品中的硒（Se）含量变化很大。在孔德罗的块状铁-铜硫化物矿石中发现了最高的硒值（130至1900 ppm），特别是富铜部分（平均硒含量1300 ppm）。奥瑟里斯硫化物的平均硒值较低（<40 ppm Se）。内罗普里奥纳一处有浸染状黄铁矿矿化的辉绿岩角砾岩筒（50×200米）中的硒含量范围为<1至35 ppm Se。在强烈蚀变的样品中发现了最高值，这些样品还显示出铂的显著富集（1 ppm Pt）。与磁铁矿相关的硫化物矿化（不规则至透镜状矿体和矿脉），赋存于佩里沃利地区（苏马山）出露的辉长岩中，硒含量范围为40至350 ppm Se。在所研究的硫化物矿化类型中硒的分布可能具有成因意义，表明硒含量通常远高于与镁铁质-超镁铁质岩石相关的典型岩浆硫化物（平均硒含量90-100 ppm），可能对环境有积极影响。
