浙闽地区火山-沉积型硼矿成矿条件初探

MINERALIZING CONDITIONS FOR THE VOLCANOSEDIMENTARY BORON DEPOSITS ACROSS THE FUJIAN ZHEJIANG REGION

浙闽地区地处太平洋构造火山带外带。通过对该区实地调查并与土耳其、美洲西部，尤其是安第斯山脉产硼区对比研究，认为二者在板块构造位置、构造盆地、深大断裂、火山岩岩石学、成矿期及古纬度古气候等方面具有不同程度的可比性。中生代板块运动与浙闽地区火山构造岩浆活动和成硼作用密切相关。浙闽地区某些晚侏罗－早白垩世喷发沉积相发育的火山盆地及火山洼地中膏盐发育，并有碳酸岩夹层的泥质岩、凝灰岩的硼异常区有找到火山沉积型硼矿的可能性。

The Fujian Zhejiang region in the outward side of the Pacific volcanotectonic belt, a promising target for hunting volcanosedimentary boron deposits, is comparable, to a certain extent, to the existing volcanosedimentary boron deposit regions such as West Turkey, West America (particularly Andean zone) and the like in terms of plate position, basin structure, profound fault, volcanic rock, paleolatitude and paleoclimate. Mesozoic plate movement contributed greatly to boron mineralization in the region as well as to the volcanic, tectonic and magmatic events when some volcanic basins or depressions of the region thickly filled with Late Jurassic-Early Cretaceous eruptive sedimentary rocks were associated with a certain amount of evaporite. In the evaporite, especially carbonatite interbedded with pelite and tuff, there will be much possibility of locating volcanosedimentary boron deposits.