内蒙古达茂旗塔林宫地区找矿前景分析     

陈军强  李志丹  曾威  王佳营  高利军 《地质论评》2016,62(S1):21-22

内蒙古达茂旗塔林宫地区位于华北板块北缘与西伯利亚板块南缘的结合带,天山―兴蒙造山系之温都尔庙俯冲增生杂岩带(内蒙古自治区地质矿产局. 1991),白乃庙―哈达庙铜、金、萤石成矿带上(邵和明,张履桥. 2001) 。区域上矿产资源较为丰富,金属矿产主要有铁、稀土、金、铜等,非金属矿产主要有萤石、石灰岩、石英岩等,比较重要的矿床有白云鄂博钒钛稀土矿、查干哈达庙铜矿、乌花敖包金矿、赛乌苏金矿、白乃庙铜金矿、石宝铁矿等。  相似文献   

阿拉善右旗石窝子―三个井地区找矿潜力分析     

陈军强  王佳营  李志丹  文思博  高利军  薛宝林 《地质论评》2016,62(S1):23-24

内蒙古阿拉善右旗石窝子―三个井地区位于华北板块西北缘与塔里木板块东北缘的结合部位,北部紧邻西伯利亚板块(郝立波等, 2004)。三级成矿带属于朱拉扎嘎―甲生盘元古代、古生代金、铅、锌、硫、铁、铜、铂、镍成矿带（Ⅲ12）,四级成矿带属于朱拉扎嘎金成矿带（Ⅳ123）(内蒙古自治区地质矿产局, 1991)。区域上已发现的矿种主要有煤、盐湖、芒硝、铁、金、磷、石灰岩、石膏、膨润土、滑石、饰面花岗岩等,代表性矿床有叠布斯格、卡休他他铁矿,朱拉扎嘎金矿,脑木洪铜多金属矿等。  相似文献   

Fluid Inclusion and Stable Isotope Geochemistry of the Shangxu Gold Deposit, Northern Tibet     

PEI Yingru  YANG Zhusen  ZHAO Xiaoyan  ZHANG Xiong  MA Wang  MAO Jingtao 《《地质学报》英文版》2016,90(4):1545-1546

正Objective The Shangxu gold deposit is located in the south of the middle Bangong-Nujiang suture zone in northern Tibet.The origin of this deposit as an orogenic gold deposit is debatable.The study of the Shangxu deposit has a profound implication on gold exploration in the BangongNujiang metallogenic belt and can also improve our understanding of gold mineralization in northern Tibet.  相似文献   

黑河新生地区中侏罗世花岗质岩石锆石U-Pb年龄、地球化学特征及岩石成因     

李森林  陈跃军  李云峰  王雄  李勇  吴国学 《世界地质》2016,35(2):297-308

黑河新生地区西古兰河以北二长花岗岩的LA-ICP-MS锆石U-Pb同位素测试结果表明,其形成时代为中侏罗世((163.8±1)Ma)。这些中侏罗世二长花岗岩属于弱过铝质高钾钙碱性系列的Ⅰ型花岗岩,明显富集大离子亲石元素(Rb、Ba、Th)和亏损高场强元素(Zr、Hf、Nb、Ta),元素Sr具有明显的负异常,表明其原始岩浆起源于地壳火成岩的部分熔融。结合区域资料同时代火成岩的组合特征和古太平洋板块的构造演化,认为该二长花岗岩形成于活动大陆边缘,而其形成的地球动力学背景可能为古太平洋板块向欧亚板块俯冲造山后的伸展环境。  相似文献   

湘南—桂东北地区寒武—奥陶纪沉积岩碎屑锆石U-Pb年代学特征及其地质意义   总被引：1，自引：0，他引：1       下载免费PDF全文

张雄  曾佐勋  刘伟  潘黎黎  杨宝忠  刘建雄  魏运许  贺赤诚  李绍凡 《中国地质》2016,(1):153-173

本文利用LA-ICP-MS分析技术,对湘南—桂东北地区寒武纪和奥陶纪沉积岩进行了碎屑锆石U-Pb年代学研究。获得有效年龄数据239组,年龄值变化范围较大(3146~474 Ma),主要集中分布于2633~2473 Ma(峰值2500Ma),1880~1521 Ma(峰值1650 Ma),1146~911 Ma(峰值970 Ma),896~720 Ma(峰值800 Ma)和682~474 Ma(峰值520 Ma)5个时间段。4件样品均记录了古太古代—中太古代年龄信息,同时以1146~911 Ma和896~720 Ma两个时间段年龄最集中,反映全球Grenville造山事件和全球Rodinia超大陆裂解事件对研究区影响显著。此外,本次还获得大量泛非期(520 Ma左右)锆石年龄,认为全球泛非事件对华夏地块及其邻区影响显著,反映华夏地块与冈瓦纳大陆可能有一定亲缘性。结合前人资料,认为研究区位于华夏地块和扬子地块西南段碰撞拼合带,研究区地层同时接受两地块物质沉积,物源主要来自华夏地块。  相似文献   

Driving forces and their interactions of built-up land expansion based on the geographical detector – a case study of Beijing,China     

Hongrun Ju  Lijun Zuo  Jinfeng Wang  Shengrui Zhang  Xiao Wang 《International journal of geographical information science》2016,30(11):2188-2207

Scientific interpretation of the driving forces of built-up land expansion is essential to urban planning and policy-making. In general, built-up land expansion results from the interactions of different factors, and thus, understanding the combined impacts of built-up land expansion is beneficial. However, previous studies have primarily been concerned with the separate effect of each driver, rather than the interactions between the drivers. Using the built-up land expansion in Beijing from 2000 to 2010 as a study case, this research aims to fill this gap. A spatial statistical method, named the geographical detector, was used to investigate the effects of physical and socioeconomic factors. The effects of policy factors were also explored using physical and socioeconomic factors as proxies. The results showed that the modifiable areal unit problem existed in the geographical detector, and 4000 m might be the optimal scale for the classification performed in this study. At this scale, the interactions between most factors enhanced each other, which indicated that the interactions had greater effects on the built-up land expansion than any single factor. In addition, two pairs of nonlinear enhancement, the greatest enhancement type, were found between the distance to rivers and two socioeconomic factors: the total investment in fixed assets and GDP. Moreover, it was found that the urban plans, environmental protection policies and major events had a great impact on built-up land expansion. The findings of this study verify that the geographical detector is applicable in analysing the driving forces of built-up land expansion. This study also offers a new perspective in researching the interactions between different drivers.  相似文献   

内蒙古东乌旗沙麦钨矿床的成矿时代   总被引：2，自引：0，他引：2  

李俊建  付超  唐文龙  李惠民  林源贤  张彤  王守光  赵泽霖  党智财  赵丽君 《地质通报》2016,35(4):524-530

内蒙古东乌旗沙麦钨矿位于贺根山断裂带以北的兴蒙造山系二连-东乌旗弧盆带内,为岩浆期后高温热液黑钨矿石英脉型矿床。采用黑钨矿Sm-Nd同位素分析获得黑钨矿的形成年龄为137.9±1.7Ma,采用TIMS锆石U-Pb同位素定年获得赋矿黑云母花岗岩的形成年龄为139.1±0.93Ma,据此提出,沙麦钨矿床的形成时代为燕山晚期,这与区域上大兴安岭西坡主要金属矿床的形成年龄数据相吻合。黑钨矿的初始ε_(Nd)值为正值,与中亚造山带内大量花岗岩的εNd值均为正值的特点相一致,表明其来源于亏损地幔源。  相似文献   

对湖北大洪山地区一套紫红色砂-砾岩系沉积年代的再认识——碎屑锆石U-Pb年龄及其地质意义   总被引：1，自引：0，他引：1  

张雄  曾佐勋  潘黎黎  曾智辉  彭练红  徐大良  魏运许  刘浩  邓新 《地质通报》2016,35(7):1069-1080

湖北大洪山地区花山群六房咀组之上不整合覆盖了一套紫红色砂-砾岩。这套岩石的沉积时代存在争议,一种观点认为是南华纪早期;另一种观点认为是晚侏罗世。利用LA-ICP-MS分析技术,对这套碎屑沉积岩进行了碎屑锆石U-Pb测年,获得有效年龄数据125组,年龄值变化范围较大(3223~771Ma),主要集中于新太古代末—古元古代早期(约2500Ma)、古元古代(约2000Ma)和新元古代(约800Ma)3个时间段。对比鄂东南地区和三峡地区莲沱组岩石学特征和碎屑锆石年龄分布特征,认为其具有相似的物源,这套岩系沉积时代应该为南华纪早期而非晚侏罗世。综合分析扬子地块的前寒武纪年龄,认为扬子地块可能存在大量未岀露的新太古代末—古元古代早期(约2500Ma)基底,约2500Ma的岩石应该是扬子地块深部基底的重要组成部分。扬子地块存在广泛的古元古代(约2000Ma)岩浆活动,这期岩浆活动可能是Columbia超大陆聚合在扬子地块的响应。新元古代(约800Ma)扬子地块北缘存在Rodinia超大陆裂解同期裂谷,裂谷内基性岩可能为大洪山地区南华纪地层中基性岩砾石的物源。  相似文献   

Effects of size and strain rate on the mechanical behaviors of rock specimens under uniaxial compression     

Qingbin Meng  Mingwei Zhang  Lijun Han  Hai Pu  Hao Li 《Arabian Journal of Geosciences》2016,9(8):527

Size and strain rate are two key factors that dramatically influence the estimation of rock mechanical behaviors. To better understand the effects of size and strain rate on measured rocks, rock specimens with six different sizes were tested at six different strain rates under uniaxial compression using the MTS 815 Rock Mechanics Test System. Having determined that the size and strain rate significantly affect the peak strain, peak stress, elastic modulus, acoustic emission (AE), and failure pattern of the rock specimens, the relation was established between the strength and the size and strain rate of red sandstone. And the variation was revealed among the size and strain rate, the AE, and the failure pattern. It turned out that the peak stress was negatively correlated with the rock size and was positively correlated with the strain rate. When the length to diameter ratio (L/D) of the rock specimen was less than 2.0, the AE appeared mildly. The AE quantities gradually increased before the peak stress, and then sharply decreased after the peak stress. The failure pattern of the rock specimen was relatively complicated, with a fracture plane appearing along the axial direction. Conical failure type was also presented. When the L/D ratio of the specimen was greater than 2.0, the AE characteristics of red sandstone showed the radical model. There were relatively few AE rings before the peak stress. But the AE rings increased suddenly and dramatically during the peak stress. The rock specimens primarily failed with a single shear plane. Moreover, with an increase in the strain rate, the AE activities were enhanced and the AE quantities increased. When the strain rate of the rock specimen was less than 5.0?×?10^?4/s, the rock specimen failed with a shear or tensile-shear pattern. And when the strain rate was greater than 5.0?×?10^?4/s, the rock specimen tended to fail in a conical pattern.  相似文献   

Soil phosphorus composition and phosphatase activities along altitudes of alpine tundra in Changbai Mountains,China   总被引：1，自引：0，他引：1  

Xiaozhu Yang  Kai Wei  Zhenhua Chen  Lijun Chen 《中国地理科学(英文版)》2016,26(1):90-98

Alpine tundra ecosystems have specific vegetation and environmental conditions that may affect soil phosphorus(P) composition and phosphatase activities. However, these effects are poorly understood. This study used Na OH-EDTA extraction and solution31 P nuclear magnetic resonance(NMR) spectroscopy to determine soil P composition and phosphatase activities, including acid phosphomonoesterase(Ac P), phosphodiesterase(PD) and inorganic pyrophosphatase(IPP), in the alpine tundra of the Changbai Mountains at seven different altitudinal gradients(i.e., 2000 m, 2100 m, 2200 m, 2300 m, 2400 m, 2500 m, and 2600 m). The results show that total P(TP), organic P(OP), OP/TP, Na OH-EDTA extracted P and AcP, PD, and IPP activities over the altitude range of 2500–2600 m are significantly lower than those below 2400 m. The dominant extracted form of P is OP(73%–83%) with a large proportion of monoesters(65%–72%), whereas inorganic P is present in lower proportions(17%–27%). The activity of Ac P is significantly positively correlated with the contents of soil OP, total carbon(TC), total nitrogen(TN), and TP(P 0.05), indicating that the Ac P is a more sensitive index for responding P nutrient storage than PD and IPP. Soil properties, P composition, and phosphatase activities decrease with increased altitude and soil p H. Our results indicate that the distribution of soil P composition and phosphatase activities along altitude and Ac P may play an important role in P hydrolysis as well as have the potential to be an indicator of soil quality.  相似文献