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黑刺沟金矿床位于甘肃省肃北县,所属构造体系为南祁连加里东褶皱带,出露地层主要有奥陶系、志留系、石炭系、三叠系、侏罗系等,褶皱和断裂构造发育,岩浆活动频繁,主要侵入体是加里东晚期第二次的石英闪长岩株。黑刺沟金矿是一个多层分布的层控型金矿,矿化体形态为层状、似层状,受滨海、浅海沉积相控制。从矿床的地质特征来看,与岩浆热液作用有关。本矿床的成因属古砾岩迭加岩浆热液型:古砾岩+上升洋流→矿源层+岩浆热液+不整合构造→金矿床。通过航磁异常的分析,深部可能存在一巨大近东西向的磁铁矿系列花岗岩基,研究矿床特征,对指导该区找矿具有重要的意义。 相似文献
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试论蛇绿碳酸岩与金矿化关系——以东准卡拉麦里蛇绿带中金水泉金矿为例 总被引:3,自引:1,他引:2
世界上分布了众多的蛇绿岩带,如加拿大的Abitibi 蛇绿岩带、欧洲的阿尔卑斯蛇绿岩带等,还有古特提斯蛇绿岩带、古亚洲洋蛇绿岩带。这些蛇绿岩带中均有脉状、透镜状碳酸岩分布。这种碳酸岩与蛇纹岩具有明显的成因关系,人们将其称为蛇绿碳酸岩(Ophicarbonate)。国内外涉及这类特殊岩石类型的研究较少,特别是关于它与金成矿关系的论述几乎未见。东准噶尔卡拉麦里蛇绿岩混杂岩带中分布了众多的碳酸岩脉,它们似乎与本带中的金矿化有密切的空间分布关系和成因联系,本文通过各自的地质特征和成矿、成岩地球动力学背景来讨论二者的关系。 相似文献
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《中国钼业》2019,(1)
庙梁金矿位于山柞旬泥盆系北部多金属矿集区的中心地带,地处华北板块与杨子板块拼接消亡带南缘的南秦岭造山带内,总体构造线呈北西西向,有北北东及近南北向构造叠加。矿体受构造控制时,矿液沿层间脆-韧性破碎带、层间裂隙带贯入、沉淀,形成构造石英脉蚀变岩型金矿;在隐爆角砾岩中受断裂破碎带和角砾岩间隙的共同控制,形成蚀变隐爆角砾岩型金矿。成矿热液属于低温变质热液+岩浆期后中温含矿热液侵入赋矿构造、在隐爆角砾岩中还萃取地层岩石中有益组分。因此矿床成因类型属沉积-浅成岩体侵位期后热液-迭加地下水循环改造的中低温热液型金矿床。早期花岗斑岩体的侵入,是形成矿区金矿床的重要条件。岩浆侵入活动产生了隐爆角砾岩,叠加改造了地层岩石的变形变质程度,形成相对高级别变质岩石和断裂破碎带,岩浆期后产生了丰富的含矿热液,为构造破碎带和角砾岩的蚀变岩和金矿床的形成奠定了成矿物质基础,且多期次岩浆侵入活动,成矿热液多次叠加,成为本区主要成矿组分金的富集成矿起到了关键作用,是矿区金矿床形成的重要成矿机制。本文在充分收集和研究区域矿产分布特征及矿化特征的基础上,结合区内金矿体矿物组成、化学成分特征以及控矿因素的研究,对庙梁金矿床的成因类型进行了初步的研究和探讨,并总结出此类矿床的找矿标志。并结合地质特征及与热液成因类型,认为本矿区具有良好的找矿前景。 相似文献
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新疆米特河一带属东特提斯构造域的一部分,通过前人资料分析,该区内沉积建造及岩浆活动、变质作用均指示特提斯洋为一个多岛小洋盆。在早石炭世末及晚石炭世末特提斯洋经历了两次开合旋回,其不同时期演化阶段,可形成不同类型的矿床,其构造演化与成矿关系十分密切。笔者通过研究,总结出区内找矿方向主要有以下四类:海相火山岩型铜锌矿;岩浆熔离型基性-超基性岩型镍矿;高温热液型铜铅锌金矿;构造破碎岩型金矿。 相似文献
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赛坡铜铅多金属矿地处金沙江板块结合带洋内弧中,区内构造复杂,岩浆活动频繁,多期次的围岩蚀变,前后叠加改造,带来了丰富的热液和矿质,形成区内众多的铜多金属矿床、点,是三江成矿带重要的成矿区之一。赛坡铜铅多金属矿矿体产于印支—燕山期中酸性岩体内、外接触带、岩体内部破碎带或裂隙带及围岩中的矽卡岩带内,含矿地层为泥盆系中、上统里农组(D_(2+3)l),为一套火山碎屑—碳酸岩的沉积建造。初步认为矿床经历了火山沉积盆地热水沉积初始成矿,花岗闪长斑岩-矽卡岩主导成矿——后期构造热液叠加成矿的复杂而漫长的成矿过程。根据赛坡铜铅多金属矿地质特征及成矿规律,结合区内地球化学异常元素组合、地层、构造等特征,认为是区内形成热液(斑岩)—矽卡岩型铜矿最有希望地区。 相似文献
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O Berg 《Canadian Metallurgical Quarterly》1998,118(9):1417-1421
Macrophages may be a potential regulator of ovarian functions. The goal of this study was to determine the changes in the macrophage frequency (number of cells per unit square of tissue) during follicular growth, ovulation, and postovulatory follicular regression in chickens. Cryostat sections of ovarian stroma containing primary follicles, small white follicles, and preovulatory and postovulatory follicles of laying hens were immunostained for macrophage using mouse anti-chicken macrophage monoclonal antibody. Macrophages were observed under a light microscope and counted by a computer assisted image analyzer. The frequency of macrophages in the theca layer was significantly greater in the small white follicles than in the primary follicles (P < 0.01) and also greater in the preovulatory follicles than in the small white follicles (P < 0.01). No significant differences were observed in the macrophage frequency between the third largest and largest preovulatory follicles. In the theca layer of postovulatory follicles, macrophage frequency was significantly greater than in that layer in the preovulatory follicles (P < 0.01); however, the frequency of macrophages decreased significantly in the Day 3 postovulatory follicles as compared with Day 1 postovulatory follicle (P < 0.05). These results suggest that macrophages may play an important role in the follicular development and regression of postovulatory follicles. 相似文献
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Improvement brought to iodinated molecules aims to obtain an optimal enhancement effect together with a lower toxicity. However, benign adverse events remain a common risk, and anaphylactoid reactions from the intravascular administration of iodinated contrast media may occur at random and are unpredictable. Although most contrast reactions are mild and self-limited, severe and even life-threatening reactions can occur at any time and for any kind of agent. Physicians must be aware of possible complications related to administration of this kind of agents and must be able to identify patients at risk, to care for prevention and prescribe an appropriate premedication regimen. 相似文献
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G Vanneuville G Poumarat S Terver M Guillot JM Garcier M Landais B Ferry 《Canadian Metallurgical Quarterly》1997,81(254):19-23
Physiological displacements of the trunk are the addition of these of the pelvic girdle and thoracic and lumbar spine segments. For a long time (3), this conjunction had been noticed but without numbered precisions. The purpose of this communication is to appreciate quantitatively, from a series of 16 subjects, the respective share of each components during lateral bending movements in the frontal plan and movements of rotation in the transverse plan. It results from this work that the pelvic girdle presents as reduced amplitude (4 degrees) in lateral bending on the other hand, displacement predominate to the level of thoracic spine (50 degrees). In rotation pelvic displacements are very important (30 degrees), while the spine so thoracic that lumbar has a weak participation (inferior to 5 degrees). Moderated abduction of hips increases by significant manner the motility of the pelvic girdle. 相似文献
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There is a tunnel connecting the beamcorridor and the target station in the spectrum hall in the CSNS project. The length of the tunnel is about 20 m. The shielding design of the tunnel is very significant for the persons working in the spectrum hall beca 相似文献
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