| 赵振明.北山南部敦煌岩群铁矿化磁铁石英岩的变质成因①[J].地质与勘探,2018,54(4):689-701 |
| 北山南部敦煌岩群铁矿化磁铁石英岩的变质成因① |
| Metamorphic formation of magnetite quartzite with iron mineralization in Dunhuang Group in southern Beishan Mountain, China |
| 投稿时间：2017-09-07 修订日期：2018-01-06 |
| DOI：10.12134/j.dzykt.2018.04.003 |
| 中文关键词: 北山南部 磁铁石英岩 变质成因 |
| 英文关键词: southern Beishan region, Dunhuang group, magnetite quartzite, metamorphic genesis |
| 基金项目:中国地质调查局“天山—北山成矿带那拉提-营毛沱地区地质矿产调查项目（编号：121201011000150002）”，中国地质调查局 “新疆若羌白山地区1:5万K46E019015、K46E019016、K46E020014、K46E020015四幅地质矿产综合调查”项目（编号：12120115021501）资助 |
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| 中文摘要: |
| 北山南部地区敦煌岩群地层中，广泛分布着铁矿化磁铁石英岩，沿着片岩顺层分布，长度为几米到一百多米不等，宽为几十厘米到两米左右，浅灰色到肉红色，具强磁性。为了研究这种石英岩的成因，笔者在新疆与甘肃的交界处白山西南侧这套地层的斜长角闪片岩中，对分布的具有代表性磁铁石英岩完整采集样品，样品具石英、磁铁矿、白云母、黑云母和绿泥石五种矿物，TFe为12.60%~12.70%。 |
| 英文摘要: |
| Magnetite quartzite with iron mineralization has been formed widely in the Dunhuang group of southern Beishan region. It is distributed along bedding schist, with length ranging from a few meters to more than 100 meters and width ranging from tens of centimeters to about 2 meters, pale gray to flesh red in color, specially, and has strong magnetism. In order to study the genesis of this magnetite quartzite, this work collected complete typical samples from plagioclase-hornblende schist in the Dunhuang group of southwestern Baishan area between Xinjiang region and Gansu Province to conduct analysis. The samples comprise of five minerals of quartz, magnetite, muscovite, biotite and chlorite, with TFe content of 12.60%~12.70%. The field geological characteristics of quartzite, indoor microscope thin-section identification results, electron probe analysis, chemical analysis and petrochemical analysis indicate that the studied magnetite quartzite is different from BIF-type ones, which has no sedimentary features but of pure metamorphic genesis. This set of ancient metamorphic strata, which agrees well with other domestic regions by previous studies, has also experienced two important Neo-Archean and Paleo-Proterozoic metamorphic events, and the magnetite quartzite with iron mineralization in this study may be formed in one metamorphic event of the two processes. This set of metamorphic strata contains abundant iron, copper, gold and other metal elements, and thus has extremely important research and prospecting significance. |
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