CAJ | 학술논문

本文报道了雅鲁藏布江缝合带西段的东波蛇绿岩地幔橄榄岩中发现与罗布莎和普兰岩体相似的金刚石和特殊地幔矿物群。东波地幔橄榄岩体以方辉橄榄岩为主，含少量二辉橄榄岩和纯橄岩，辉石岩和辉长岩呈脉状产在方辉橄榄岩中。岩石地球化学特征表明东波岩体形成于MOR环境后受到SSZ环境的改造。通过重砂分选实验，在693 kg的地幔橄榄岩大样中发现了金刚石和碳硅石等30余种特殊矿物群，包括金刚石、自然铬、自然金、自然铁、自然硅、自然铜等自然元素矿物类；碳硅石等碳化物；铬尖晶石、金红石、铬铁矿、刚玉、黑钨矿、铌钽铁矿、磁铁矿、赤铁矿、方铁矿、锡石等氧化物；铁铬镍合金、镍铁合金、铜锌合金等合金互化物；辉钼矿、方铅矿、辉铋矿、黄铁矿、黄铜矿、毒砂和闪锌矿等硫化物；橄榄石、辉石、锆石、蓝晶石、白云母、蛇纹石、绿帘石等硅酸岩；萤石等氟化物。该矿物群与雅鲁藏布江缝合带的罗布莎和普兰两个岩体中发现的特殊矿物群非常类似，同时也为蛇绿岩型金刚石这一新类型提供了佐证。
본문보도료아로장포강봉합대서단적동파사록암지만감람암중발현여라포사화보란암체상사적금강석화특수지만광물군。동파지만감람암체이방휘감람암위주，함소량이휘감람암화순감암，휘석암화휘장암정맥상산재방휘감람암중。암석지구화학특정표명동파암체형성우MOR배경후수도SSZ배경적개조。통과중사분선실험，재693 kg적지만감람암대양중발현료금강석화탄규석등30여충특수광물군，포괄금강석、자연락、자연금、자연철、자연규、자연동등자연원소광물류；탄규석등탄화물；락첨정석、금홍석、락철광、강옥、흑오광、니단철광、자철광、적철광、방철광、석석등양화물；철락얼합금、얼철합금、동자합금등합금호화물；휘목광、방연광、휘필광、황철광、황동광、독사화섬자광등류화물；감람석、휘석、고석、람정석、백운모、사문석、록렴석등규산암；형석등불화물。해광물군여아로장포강봉합대적라포사화보란량개암체중발현적특수광물군비상유사，동시야위사록암형금강석저일신류형제공료좌증。
This paper reports the discovery of unusual mantle mineral group in the mantle peridotites of Dongbo ophiolite, which lies in the western part of the Yarlung Zangbo suture zone. The Dongbo ophiolite consists mainly of harzburgite, with a small amount of lherzolite and dunite, pyroxenite and gabbro dikes cutting across the harzburgite. Geochemical characteristics suggest that the Dongbo mantle peridotite was derived from mid-ocean ridge (MOR) but modified in a suprasubduction zone (SSZ) environment. Some grains of diamond and other unusual minerals, such as moissanite, were recovered by standard mineral separation techniques from a 693 kg sample of harzburgite. The presence of diamond, native Cr, Au, Fe, Si and Cu, together with the moissanite, indicates a strong reducing environment. The authors also found a lot of alloys, oxides, sulfides, silicates, fluoride and some other materials. These mineral assemblages recovered from the Dongbo harzburgite are very similar to those of Luobusa and Purang harzburgite, which gives evidence to the ophiolite-type diamond.