雪峰山地区长界岩浆硫化物镍矿成矿地质特征——与桂北宝坛地区类比研究

Geological and Mineralization Characteristics of Changjiang Magmatic Sulfide Nickel Deposit in Xuefengshan Area: An A Analogy Study with Baotan Area in Northern Guangxi

长界镍矿位于江南造山带西段,为湖南省内已发现的唯一一个与基性-超基性岩有关的岩浆硫化物镍矿床。与其毗邻的桂北宝坛地区与长界镍矿位于一同一岩浆构造带上,Cu-Ni等多金属矿床找矿成果显著。本文通过对长界矿床的地质背景、含矿岩体特征、矿体特征进行分析研究,并与宝坛地区进行类比,结合最新科研进展,认为二者具有相似的成岩成矿地质背景,长界地区工作程度较低,找矿潜力较大。总体而言,长界地区构造相对简单,岩浆活动相对较弱,矿种单一,成矿方式单一。宝坛地区构造相对发育,岩浆活动相对较强,矿种多且相对较富,成矿方式相对复杂。长界地区找矿工作应重点关注深大断裂附近、并且岩浆活动相对强烈的超基性岩体。

The Changjie nickel deposit, located in the western part of the Jiangnan orogenic belt, is the only magmatic sulfide nickel deposit related to basic-ultrabasic rocks discovered in Hunan Province. The Baotan district in northern Guangxi Province is adjacent to and located in the same magmatic tectonic belt with the Changjie nickel deposit, in which the exploration for Cu-Ni polymetallic ore yielded impressive results. Based on the study of the geological background, and characteristics of ore-bearing intrusions and ore-bodies of the Changjie deposit, and compared with Baotan area, and combined with the latest scientific research progress, it is considered that the two deposits have similar diagenetic and metallogenic geological background. The Changjie deposit has a low degree of work and a great potential for prospecting. Generally speaking, the Changjie deposit has relatively simple structure, relatively weak magmatic activity, single mineral species and single metallogenic mode. Relatively speaking, in Baotan area, The structure is more developed, the magmatic activity is more strong, the mineral types are more abundant, and the metallogenic mode is more complex. The prospecting work in Changjie deposit should focus on ultrabasic intrusions near deep and large faults and with relatively strong magmatic activities.