辽宁营口后仙峪硼矿区超镁橄榄岩的控矿作用  

Ore-control role of ultra-magnesium peridotite in Houxianyu boron ore district,Yingkou,Liaoning Province

作　　者：王翠芝[1] 肖荣阁[1] 刘敬党[1] 费红彩[2] 王文武 周红春[1] 刘敬青[1] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质科学院矿产资源研究所,北京100037 [3]辽宁省化工地质勘查院,辽宁锦州121000

出　　处：《矿床地质》2006年第6期683-692,共10页Mineral Deposits

基　　金：国家自然科学基金项目(40073013)的资助

摘　　要：为了研究辽宁营口后仙峪硼矿区超镁橄榄岩与硼矿的关系,作者通过硼矿与超镁橄榄岩两者在产出空间关系、岩石学和地球化学方面的比较,发现:①硼矿体与超镁橄榄岩空间关系上具一致性;②硼矿体与超镁橄榄岩在岩石学上具继承性;③硼矿石、超镁橄榄岩的地球化学特征具相似性,从而得出超镁橄榄岩不仅是该区硼矿的容矿岩石,而且对硼矿的形成有决定性的岩控作用,进一步认为辽东硼矿的容矿岩石不全是镁质大理岩,其他富镁岩石在一定条件下也可成为硼矿的容矿岩石。Located in Yingkou of Liaoning Province, the Houxianyu boron deposit is of the suanite-szaibelyite type, with the host rock being the serpentinized and magnesitized ultra-magnesium peridotite. A comparison of spatial relationship, petrology and geochemistry between the boron deposit and the ultra-magnesium peridotite has led to the following conclusions＂ （ 1 ） the ore bodies have the same spatial relationship with the ultra-magnesium peridotite, because the boron bodies are hosted in the ultra -magnisium peridotite and magnesite marble in lamellar, lamellated and lentoid forms; （2） the ores show inheritance relationship with the ultra-magnesium peridotite in mineral formation, texture and structure. The metasomatic relict texture and the metasomatic pseudomorphic texture find expression in the metasomatic relationship of szaibelyite with forsterite, serpenite and early ore minerals. The relict structure is obvious, and such structures as the blasto-nodule structure, the blasto-ball structure, the jet brecciated structure, the blasto-banded structure, the brecciated structure, the anti-brecciated structure, the granophyric structure, and the tripod structure all have to do with the ultra-magnisium peridotite and serpenitinized peridotite; （3） the ores show inheritance in geochemistry, especially in REE. The boron ores and the ultra-magnisium peridotite both show magnesium-rich, iron-rich and boron-rich characteristics, and also show close relationship in the evolution of rock formation. They are similar in trace elements. They have the same kinds and contents of trace elements, and their features of evolution are similar. They are consistent in REE evolution, and both have the ＂Ⅴ＂ type REE pattern. It is thus held that the ultra-magnisium peridotite not only is one kind of host rocks, but also controls the characteristics of the boron ores in the boron deposit. In addition, magnesium marble is not the only host rock in eastern Liaoning-southem Jilin boron deposits- and other magnesium-rich rock

关 键 词：地质学 硼矿 超镁橄榄岩 控矿作用 后仙峪 辽宁 

分 类 号：P611.1[天文地球—矿床学]