中国铬铁矿资源潜力分析及找矿方向  

Geological characteristics and mineralization potential of chromite resources in China

作　　者：杨毅恒[1] 曾乐 邓凡 胡建中[3] YANG Yiheng;ZENG Le;DENG Fan;HU Jianzhong(Beijing Information Science and Technology University, Beijing 100085, China;Tianjin Center, China Geological Survey, Tianfin 300170, China;China University of Geosciences （ Beijing ） , Beijing 100083, China)

机构地区：[1]北京信息科技大学,北京100085 [2]中国地质调查局天津地质调查中心,天津300170 [3]中国地质大学(北京),北京100083

出　　处：《地学前缘》2018年第3期138-147,共10页Earth Science Frontiers

基　　金：中国地质调查局项目"全国重要矿产总量预测"(1212010633905;1212010733806;1212011121040)

摘　　要：铬铁矿是我国急缺的战略矿产之一,主要来源依靠进口,由于资源储量和生产量有限,供需缺口连年加大。本文在全国重要矿产资源潜力评价数据成果基础上,对全国铬铁矿资源进行潜力预测。通过对我国铬铁矿产分布特征、成矿类型的系统分析,进行了成矿区带划分,划分出4个Ⅰ级成矿域、11个Ⅱ级成矿省和20个Ⅲ级成矿带。综合成矿规律,归纳出预测要素,建立了两种预测评价模型,分别为与超基性岩有关的侵入岩体型铬铁矿和与超基性岩有关的似层状岩浆型铬铁矿。在充分收集整理各省铬铁矿地质资料基础上,以GIS的矿产资源预测与评价为手段,开展了预测区的圈定与优选,重点筛选出3个预测资源量较大可达到500万t以上的铬铁矿三级预测区,进行了简单的资源评价,探讨铬铁矿资源潜力,提出找矿建议。评价数据显示,全国铬铁矿资源总量7 215.32万t,累计查明铬资源量共计1 565.59万t,预测铬资源量共计5 649.73万t。综合分析铬铁矿研究区已有工作成果和找矿进展,结合全国重要矿产资源潜力评价最新成果,认为在新疆萨尔托海、西藏罗布莎、甘肃大道尔吉等地区资源潜力巨大,是主要找矿方向,可作为重点找矿部署区。Chromite is one of the strategic minerals and in great shortage in China.The country relies on import to meet its resources need as the gap between chromite supply and demand widens yearly due to limited reserves and production capacity.Based on the systematic analyses of the distribution characteristics and metallogenic types of chromite minerals in China,we divided chromite metallogenic zones into 4 level-I domains,11 level-II provinces and 20 level-Ⅲ belts.We also determined the forecasting parameters and established the prediction models：one for the intrusive body type ultrabasic rocks,and the other for the stratiform-like magmatic type chromite deposits.Using geological data—collected and tabulated for each province—and guided by GIS technology,we performed the delineation and optimization of the forecasting areas,and focused on the 3 selected level-Ⅲ chromite prediction areas for resource evaluation.By estimation,chromite reserves may reach 500 million tons in the forecasting areas.Our data showed that the national chromite resources are 7.21532 billion tons in total,with 1.56559 and 5.64973 billion tons in demonstrated and predicted resources,respectively.Integrating new and old resources assessment data,it is believed that great potential exists for resource exploration in areas such as Saertuo Sea in Xinjiang,Luobusa in Tibet,and Dadaoerji in Gansu Province.

关 键 词：铬铁矿 矿产地质特征 预测模型 资源潜力分析 

分 类 号：P618.33[天文地球—矿床学] P612[天文地球—地质学]