关于中国西部龙首山、祁连山成矿区（带）进一步找矿问题的思考

进入21世纪以来,我国许多矿山都面临着后备资源危机问题,西部地区甘肃境内的龙首山、祁连山成矿区（带）里的矿山也不例外。从"成矿系统"的观念出发,深入分析了区域成矿构造背景,认为区内存在华北古陆西南和柴达木-中祁连北部两种大陆边缘;提出应利用非传统矿产理念进行新一轮矿产勘查,在龙首山、祁连山成矿区（带）不仅要加强传统矿种的勘查,也要注意新类型矿产的开发,同时注意环境保护;最后,还强调矿产资源的勘查和开发工作离不开既有较高理论水平又具有丰富勘查经验的高素质勘查人才,也离不开强有力的资金保证。     

郑州国际会展中心工程外控方法的研究

以实例介绍了距离侧方交会方法在建筑施工测量中的应用,提出了建筑物“外控”放线测站点坐标计算公式.并采用不同的方法对测量结果进行检验.通过实验数据验证该方法具有明显的“误差几何缩放”特征,其测定点位精度较高.根据该方法的特点提出了提高工程测量控制点精度的设想.     

Deep Tectonic Processes and Superaccumulation of Metals Related to Granitoids in the Nanling Metallogenic Province, China

The Nanling region is an important nonferrous and rare metal metallogenic province in South China, in which most of the deposits are related to granitoids in genesis. It covers southern Hunan, southern Jiangxi, Guangxi, Guangdong and Fujian provinces, with a total area of about 550,000 km2. This metallogenic province is well known in the world for its rich tungsten and tin resources. In the past 40-odd years, a vast amount of mineral exploration activities and studies of the geology of mineral deposits have been carried out and great achievements obtained in the province. This paper is focused on a discussion about the deep tectonic processes in the orogenic belt during the Mesozoic and their contribution to the superaccumulation of metals. Tectonically, this metallogenic province is composed of three units: (1) the marginal continental orogenic belt in the Southeastern Coast fold system in the Yanshanian; (2) the intercontinental orogenic belt in the collision suture belt between the Yangtze and Cathaysian plates mainly in the Caledonian; and (3) the intracontinental orogenic belt induced by subduction of the ocean crust and delimination of the mantle lithosphere in the Yanshanian. It is suggested that superaccumulation of metals in this metallogenic province was caused by the existence of mantle rooted tectonics at the depth based on comprehensive studies of geophysical information of seismic, geothermal and magnetotelluric surveys in Nanling and its adjacent areas. The Xihuashan wolframite quartz vein deposit, the Shizhuyuan W, Sn, Mo, Bi greisen-skarn deposit and the Dachang tin-polymetallic deposit are three typical examples of the deep tectonic processes. However, this kind of deep tectonic processes only act as the "engine" of the superaccumulation of metals, which means that they should have to correspond with the super-crust ore-controlling pattern of "lines-rows-clusters" (L-R-C). This recognization is expected to play an important role in assessment of mineral resources in this province.     

Deep Tectonic Processes and Superaccumulation of Metals Related to Granitoids in the Nanling MetaUogenic Province,China

The Nanling region is an important nonferrous and rare metal metallogenic province in South China, in which most of the deposits are related to granitoids in genesis. It covers southern Hunan, southern Jiangxi, Guangxi, Guangdong and Fujian provinces, with a total area of about 550,000 km2. This metallogenic province is well known in the world for its rich tungsten and tin resources. In the past 40-odd years, a vast amount of mineral exploration activities and studies of the geology of mineral deposits have been carried out and great achievements obtained in the province. This paper is focused on a discussion about the deep tectonic processes in the orogenic belt during the Mesozoic and their contribution to the superaccumulation of metals. Tectonically, this metallogenic province is composed of three units: (1) the marginal continental orogenic belt in the Southeastern Coast fold system in the Yanshanian; (2) the intercontinental orogenic belt in the collision suture belt between the Yangtze and Cathay     

Convective Storm VIL and Lightning Nowcasting Using Satellite and Weather Radar Measurements Based on Multi-Task Learning Models

Convective storms and lightning are among the most important weather phenomena that are challenging to forecast. In this study, a novel multi-task learning(MTL) encoder-decoder U-net neural network was developed to forecast convective storms and lightning with lead times for up to 90 min, using GOES-16 geostationary satellite infrared brightness temperatures(IRBTs), lightning flashes from Geostationary Lightning Mapper(GLM), and vertically integrated liquid(VIL)from Next Generation Weather Radar...     

菲律宾拉拉布金矿床围岩蚀变与成矿作用

从"景"、"场"、"相"、"床"4个等级体制观点出发,阐述了该金属成矿省成矿内部组成,观点新颖。金矿赋存于中新世-更新世马林丹群火山岩中,该群火山岩呈零星岛状散布于斯丹岗-哥塔巴托-大姑玛线性构造活动带(SCDL)的东部,并受到后期安山玢岩的侵入。安山玢岩具有埃达克岩性质,它的侵入对于后期的围岩蚀变和成矿作用起到重要的控制作用。拉拉布矿床的安山岩具有明显的热液蚀变,属于冰长石-绢云母型金矿化,认为金是在PH值近中性的浅表环境中由于热液沸腾并伴随流体的混合沉淀而成,通常富集于标高30~200m之间。围岩蚀变强度大,并有明显的分带规律,制约着金矿的形成。金的富集与下列地质事件相关:(1)形成角砾岩之前的围岩蚀变作用;(2)热液角砾岩的形成;(3)形成角砾岩后的围岩蚀变作用;(4)金矿形成。     

草桃背矿床白垩纪橄榄玄粗岩与铀成矿关系

赣南会昌断陷盆地沿石城-寻乌深断裂分布一条白垩纪橄榄玄粗岩系列的火山岩带。草桃背大型铀矿床内出露大富足岩体中-粗粒黑云母花岗岩及早白垩世晚期到晚白垩世早期橄榄玄粗岩系列火山岩。大富足花岗岩体岩石w(SiO₂)平均为74.67％,碱总量(w（K₂O+Na₂O）)平均为7.99％,w(K₂O)>w(Na₂O),w(CaO)平均为0.54％,w(Al₂O₃)>w(CaO+Na₂O+K₂O),属高钾钙碱性岩石系列。橄榄玄粗系列火山岩岩石w(SiO₂)为45.78 %~59.78 %,w(K₂O+Na₂O)平均为7.37%,K₂O/Na₂O平均为1.02,w(TiO₂)平均为0.86%, 全铁质量分数平均为7.09%,属偏碱性橄榄玄粗质火山岩类。草桃背铀矿床赋矿岩性为橄榄玄粗岩、碎裂花岗岩及隐爆角砾岩。赋存于碎裂花岗岩及隐爆角砾岩中铀矿石化学成分,与围岩花岗岩成分相似;赋存于橄榄玄粗岩中铀矿石,Fe₂O₃+Fe₂O、CaO、MgO不同程度地带出,w(SiO₂)明显增高,表明橄榄玄粗岩在成矿过程中,通过输出大量Fe、Mg、Ca等阳离子而促进铀离子从含矿溶液中沉淀。草桃背矿床的铀矿化与充填在草桃背火山口的橄榄玄粗岩关系密切,在时间上相近、在空间上相伴、在成生上相关,受橄榄玄粗岩岩浆系列热动力的影响,铀元素发生活化、转移或物质交换而成矿,成岩成矿时代属早白垩世晚期到晚白垩世早期。从草桃背铀矿床岩石学、地球化学及赋矿特征入手,总结了铀成矿是富铀矿的花岗岩基底、北东向构造及火山作用结合的产物,橄榄玄粗岩提供热源,并指出半岭、上寮、小富足等地段是寻找草桃背式铀矿床的极有利地区。     

青海野马泉铁锌矿床二长花岗岩锆石U-Pb和金云母Ar-Ar测年及地质意义

青海野马泉铁锌矿床地处祁漫塔格山与柴达木盆地之间的盆山结合部位,是矽卡岩型铁锌多金属矿床。矿体均呈隐伏?半隐伏状产出、具多期次强烈岩浆活动叠加等特征。长期以来,有关野马泉铁锌多金属矿床的成矿岩体和成矿时代众说纷纭,制约了对该矿床成因机制的认识及进一步的矿产勘查工作。本文基于详细的野外实地调查和矿床地质特征解剖,开展了成岩成矿年龄精测,探讨了成矿构造环境。铁锌矿体产于二长花岗岩与围岩地层的外接触带,发育石榴子石、透辉石、金云母、绿帘石等矽卡岩化作用。利用LA-ICP-MS锆石U-Pb法,获得成矿二长花岗岩的年龄为229.5±2.2 Ma(n=22,MSWD=1.3);采用Ar-Ar分步升温法获得与磁铁矿共生的金云母坪年龄为222.0±1.3 Ma(MSWD=0.41)、等时线年龄为222.4±2.5 Ma(MSWD=1.4),证实野马泉铁锌多金属矿床形成于晚三叠世,成矿岩体属过铝质、高钾钙碱性系列,为I-A过渡型花岗岩,具有高SiO_2,高K_2O/Na_2O,低P_2O_5,低Sr高Yb的特点。结合区域其他多金属矿床最新成岩成矿年代学数据,认为野马泉矿床形成于东昆仑地区海西?印支造山旋回晚期、由碰撞向后碰撞转换的地质构造环境。     

安徽铜陵新屋里岩体黑云母、斜长石40Ar-39Ar年龄及其地质意义

通过对凤凰山铜矿床新屋里岩体的黑云母、斜长石单矿物进行阶段加热法40Ar-39Ar 定年,获得石英二长闪长岩中黑
云母及斜长石坪年龄分别为（152.1±1.7）Ma 和（135±1）Ma,花岗闪长岩中黑云母及斜长石坪年龄分别为（143.8±0.9）
Ma 和（140.4±0.9）Ma,反映了长江中下游地区燕山期岩浆活动的一个重要阶段。石英二长闪长岩中黑云母的40Ar-39Ar年
龄显著高于前人的锆石U-Pb 年龄,可能为含过剩Ar 的结果。结合已知年龄资料,作出新屋里岩体不同单元的冷却曲线,
显示新屋里岩体在晚侏罗世的冷却速率很大,暗示当时处于一种伸展的构造背景之下,其形成可能与中国东部中生代晚期
的岩石圈减薄事件有关。     

巴林左旗双尖子山银多金属矿床基本地质特征及成因机制

巴林左旗双尖子山银(铅、锌)矿床位于大兴安岭南段,为超大型热液脉型矿床,在时空分布上与中生代构造—岩浆岩关系密切。双尖子山银多金属矿化多呈席状、细脉浸染状、网脉—脉状在下二叠统大石寨组火山—沉积岩产出,并且构成似层状、(长)扁豆状、透镜状和囊状矿体。初步研究表明:与银多金属共生的绢云母和辉钼矿同位素年龄分别为146.9±1.9 Ma和162.6±2.6 Ma,与区域侏罗纪火山岩同位素年龄160~147 Ma基本一致。根据矿区外围白音诺尔花岗岩体锆石年龄142~115 Ma,可以推测双尖子山银多金属主成矿作用与侏罗纪构造—岩浆活动相关,而与后期大规模中酸性岩浆侵位并无直接的成因联系。根据矿床产出环境、矿化和热液蚀变特征的初步研究结果表明,双尖子山可能经历了多次矿化的叠加,其可能与古太平洋板块远程俯冲和中生代动力机制转换作用有关。