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[an error occurred while processing this directive]Geochemical Characteristics and Geological Significance of Granite in Xiaridawu Niobium-Tantalum Mining Area,Northern Margin of Qaidam Basin
Received date: 2022-08-15
Revised date: 2022-12-20
Online published: 2023-07-20
The northern margin of the Qaidam Basin is located in the north of the Qaidam Basin and the south of the Qilian orogenic belt,and in the Qinling-Qilian-Kunlun orogenic belt with strong tectonic-magmatic activity.It is one of the hot areas of geological research in recent years.A large number of early Paleozoic granites are distributed in the Xiaridawu niobium-tantalum mining area in the northern margin of the Qaidam Basin.The analysis of the magma source, formation mechanism and tectonic environment of granites plays an important role in revealing the formation mechanism and tectonic environment of granites,which also plays an important role in revealing the formation and evolution mechanism of continental crust in the northern margin of the Qaidam Basin.Based on the analysis of petrological and geochemical characteristics of granites in Xiaridawu niobium-tantalum mining area on the northern margin of Qaidam Basin,the magma source,formation me-chanism and tectonic environment of granites was analized.It is found that the biotite granite porphyry in the Xiaridawu area has high silicon,high potassium and aluminum,and the other major elements show the characteristics of low magnesium and low manganese,poor phosphorus and titanium.The biotite granite porphyry is enriched in light rare earth elements,while relatively depleted in heavy rare earth elements,REE chondrite-normalized partitioning curve is ‘V’ shaped distribution,and the negative Eu anomaly is obvious.It is relatively enriched in large ion lithophile elements,relatively depleted in high field strength elements. According to the analysis of related parameters of major,trace and rare earth elements, the granite porphyry in the mining area is a highly differentiated S-type peraluminous granite. In addition to the low-temperature melting of crustal materials, the source is not excluded from the contamination of mantle materials, and there are some separated crystallization products, which has a very favorable effect on the mineralization of niobium and tantalum deposits in this area. According to the tectonic environment discrimination of multiple sets of main elements and trace elements,the granite porphyry in the Xiaridawu niobium-tantalum mining area on the northern margin of Qaidam Basin was formed in the collision tectonic environment of the transition from collision orogenic to intraplate.The study has important geological significance for understanding the genesis,provenance,tectonic environment and prospecting direction of granite in this area.
Shengyun WEI , Jianguo WANG , Xuezhong GUO , Jia XING . Geochemical Characteristics and Geological Significance of Granite in Xiaridawu Niobium-Tantalum Mining Area,Northern Margin of Qaidam Basin[J]. Gold Science and Technology, 2023 , 31(3) : 408 -422 . DOI: 10.11872/j.issn.1005-2518.2023.03.102
全面启动新一轮找矿突破战略行动
2023年7月11日,国务院新闻办公室举行“权威部门话开局”系列主题新闻发布会,自然资源部部长、国家自然资源总督察王广华提到,自然资源部围绕能源资源安全,全面启动实施新一轮找矿突破战略行动,完善矿产勘查开采管理制度,激发矿业市场活力。2023年上半年,全国固体矿产、油气矿产勘查投入同比增长17.2%、7.5%;全国新设探矿权242个,同比增长25.4%,并陆续取得山东莱州金矿、云南昭通磷矿等重大找矿突破。
王广华介绍,自然资源部在推进国家重要能源、矿产资源国内勘探开发和增储上产方面主要开展了三方面工作。在强化重大基础工作方面,一是对全国有查明资源储量的全部163种矿产、4.5万余个矿区开展了调查,全面摸清了我国各种矿产的数量、质量、结构、空间分布和开发利用情况。二是划定基础调查区、重点调查区,加大矿产资源调查工作力度;划定重点勘查区、重要矿山深部,开展找矿预测和矿体定位等工作,加大“攻深找盲”力度。“十四五”以来,已初步圈定找矿远景区124处、提交找矿靶区102个,为社会资金开展商业性勘查提供指引。
在加强支持矿产资源勘查开发政策供给方面,一是完善矿业权出让收益征收管理制度。将征收方式由一次性征收,改为主要在矿山生产时按销售收入逐年征收,既维护矿产资源国家所有者权益,又切实减轻了企业负担。二是完善矿产资源勘查开采登记管理。鼓励实施矿产资源综合勘查。放活探矿权二级市场,放开招标拍卖挂牌取得的探矿权转让年限限制,允许探矿权流转。精简矿业权登记申请要件和审批环节,提高审批效率。三是允许夹缝资源、深部资源等以协议方式向同一主体出让矿业权;调整探矿权延续扣减面积比例、细化油气探采合一制度、延长探矿权保留期限、完善矿业权竞争出让等等,促进矿产资源勘探开发。
在加强科技支撑方面,创新示范了一批新技术、新方法。推动实施相关重大科技项目,推进国家重点研发计划专项实施。在自然资源科学技术奖评选中专门设立“地质找矿奖”,激励地勘队伍找矿积极性。
王广华表示,下一步,自然资源部还将会同有关部门继续优化完善相关政策,为各类社会主体投资矿产勘查开发创造良好环境,比如,指导各地推进“净矿”出让,通过加强矿业权出让前期准备工作,提高服务效率,加强用地用林用草要素保障;加快推进重点矿业项目审批,促进拉动内需和稳增长,以有力举措扎实推进新一轮找矿突破战略行动。
http://www.goldsci.ac.cn/article/2023/1005-2518/1005-2518-2023-31-3-408.shtml
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