中文摘要：

黔西南簸箕田金矿是新近发现的一个中型卡林型金矿。该文在显微镜矿相学观察的基础上，采用电子探针显微分析，包括背散射电子图像、点分析和面分析，对金矿中的赋金矿物展开了基本特征和赋金状态研究，发现含砷黄铁矿和毒砂是主要的赋金矿物。赋金黄铁矿又以环带状和细粒自形为主，莓球状、粗粒以及条带状次之。这些黄铁矿成因复杂，并且可能普遍受到热液蚀变作用影响。环带状黄铁矿核部中的金可能主要以“不可见”超显微包裹金（纳米级自然金，AU^0）的形式赋存，而环带部分中的金可能以固溶体金（Au^＋）的形式赋存，并也可能存在纳米级自然金（Au^0）。相比而言，莓球状、粗粒和条带状黄铁矿中的金既可能含有纳米级自然金（Au^0），也可能含有固溶体金（Au^＋）。对于毒砂，单独的毒砂和黄铁矿一毒砂集合体中的毒砂均为热液成因，都赋存金，但以单独的毒砂为主，金以“不可见”超显微包裹金（纳米级自然金，Au^0形式存在。

英文摘要：

The recently discovered Bojitian carlin-type gold deposits are located in the southwestern Guizhou Province and are middle in scale. In this study, we investigated the mineral＇s gold-bearing characteristics based on integrated studies of microscope observations and electron-probe back-scattered image, element spot and element map analyses. Analytical results show that arsenian pyrites and arsenopyrites are major gold-bearing minerals. The gold-bearing pyrites are dominated by zoned arsenian pyrites and fine-grained arsenian pyrites, followed by framboidal pyrites, coarse-grained pyrites, and banded pyrites. These pyrites have complex origins and most of them may hare undergone hydrothermal alterations. The gold in the cores of the zoned arsenian pyrites occurs as ＂invisible＂ microscopic inclusions of gold grains （nanoparticles of native gold, Au^0）. In contrast, the gold in the rims of the zoned arsenian pyrites occurs in solid solution （Au^＋） and may occur as nanoparticles of native gold （Au^0）. With respect to the gold in framboidal pyrites, coarse-grained pyrites, and banded pyrites, it occurs as nanoparticles of native gold （Au^0） or in the solid solution （Au^＋）. The arsenopyrites in the individual arsenopyrites and aggregations of pyrite-arsenopyrite are of hydrothermal origin. The gold occurs mainly in the former phase and is generally ＂invisible＂ microscopic inclusions of gold grains （nanoparticles of native gold, Au^0）.