摘要
淘锡坝锡矿发育有云英岩型、破碎带蚀变岩型、（次火山）隐爆层间裂隙带型等锡矿化，（次火山）隐爆层间裂隙带型锡矿化是矿区主要矿化类型。矿化产于密坑山侵入杂岩体、北西部分鸡笼嶂组流纹质晶屑凝灰熔岩外接触带微细裂隙带中，矿体呈缓倾斜似层状、脉状。控矿因素主要有地层、岩浆岩、构造。矿化对火山岩岩性有一定的选择性，成矿物质主要来源于岩浆岩，（次火山）隐爆层间裂隙带构造是矿床重要的赋矿构造。矿床成因类型为与火山活动期后次火山（隐爆）活动有关的岩浆期后高—中温热液交代—充填型矿床；同时，矿床兼具广义的斑岩型锡矿的特征。该矿化类型的初步探明，进一步拓展了赣南中生代火山岩区的找矿空间。
： Greisen type, crushed zone altered rock type and subvolcanic concealed explosive intrastratal fracture zone type tin mineralization is developed in the Taoxiba tin deposit, with the last type predominating． Tin mineralization occurs in a minute－fracture belt in the exo－contact zone of the rhyolitic crystal tuffaceous lava of the Late Jurassic Jilongzhang Formation． Orebodies occur in gently dipping bedded form and vein form． The ore－controlling factors include largely stratigraphic, igneous, and structural． Mineralization is confined in certain types of volcanic lithologies, ore materials are derived from igneous rocks, and the main ore－controlling structure is the subvolcanic concealed explosive intrastratal fracture belt． In genetic type, it is a post－magmatic high－medium temperature hydrothermal－replacement and cavity－filling deposit related with subvolcanic concealed explosive activity posterior to volcanism． Meanwhile, this deposit also shows the characteristics of a porphyry tin deposit in a broad sense．The establishment of such a mineralization type helps to open up a new way in ore－searching in the Mesozoic volcanic rock areas in South Jiangxi．
出处
《江西地质》
2001年第2期119-124,共6页
Jiangxi Geology
关键词
隐爆层间裂隙带
成矿母岩
矿床成因
会昌县
锡矿床
火山活动
中生代
找矿前景
subvolcanic concealed explosive intrastratal fracture belt
mother rock for mineralization
ore genesis
ore－searching significance
Taoxiba tin deposit； Huichang County
