辰山岩体周边白钨矿床地质特征与找矿前景

近年在辰山岩体内外接触带相继发现多处层控夕卡岩型、接触交代型和石英脉型的大中型白钨矿床(点)。矿床多层位、多部位赋存并与一定的岩性、构造密切相关,为夕卡岩型白钨矿床。岩体和特定层位是主要的控矿条件。矿床形成于印支晚期同造山阶段后碰撞构造环境。沿岩体接触带形成的宽达数百米至数千米的角岩化带及夕卡岩化角岩带、夕卡岩带等蚀变带,以及W元素地球化学异常和白钨矿重砂异常带(区)都是成矿的有利地带(段)。区域成矿潜力大,找矿前景良好。在勘查工作中,除对地表出露的夕卡岩化带开展直接找矿外,应加强隐伏矿床的找矿研究工作。辰山岩体外接触带层控夕卡岩型白钨矿床是岩体周边找矿勘查的主要矿床类型。

Geological feature and prospecting potential of scheelite deposits in surrounding of Chenshan intrusion

In resent years medium-large-sized sheelite deposits (occurrences) have been successively discovered at the inner and outer contact zones of Chenshan intrusion. The deposits include stratabound skarn type, contact metasomatic type and quartz vein type of sheelite deposit. The skarn type formed at different horizons and localities are closely related to certain lithologies and structures and are commonly controlled by specific horizons of the intrusion. The deposits were formed in post-collision tectonic environment of Late Indosinian syn-orogenic movement. Hornfelization zones and skarnized hornfel zones which are several hundreds or several thousands of meter wide, alteration zones and W-geochemical anomlies and heavy mineral anomlies (sheelite) are all the targets for further prospecting. In addition to skarnized zones at surface attention should be paid to blind ore bodies during prospecting. Prospecting of stratobound skarn sheelite deposit should be focused on outer contact zone of Chenshan intrusion.