冀西北小营舟金矿找矿靶区初探

依据张宣幔枝构造的成矿控矿特征及小营盘金矿控矿构造研究,提出了小营盘金矿区南侧Ｆ１２断层晚期活动为正断层,应注意寻找深部矿体。     

张宣幔枝构造成矿与深部找矿潜力分析

张家口地区是河北省金银多金属矿床集中区,本文划分出以宣化-崇礼-赤城一带岩浆-变质杂岩区为中心的金矿集中区和外围盖层区银多金属成矿分布区。幔枝构造研究表明,金银多金属成矿物质主要来自地球深部,通过地幔热柱多级演化向上迁移,并在幔枝构造的有利构造扩容带中集聚成矿。平面上从中心向外围,空间上,由下部往上部都具有金→银→铅锌的分带性,并已经在多处矿山得到研究证实。因此,张宣幔枝构造区深部仍有很大的找矿潜力。     

赤城县万全寺银金矿深部找矿预测

冀北地区发现和勘查了大量的银金矿、银铅锌矿、铅锌银矿，其深部是否存在金矿，是一个重大的深部找矿问题。基于幔枝构造成矿物质深部来源的认识，通过稳定同位素、稀有气体同位素、主要载体矿物微量元素及主矿体V-1脉6个中段和V-2脉3个中段1412件基本分析样品银、金的品位变化规律研究，认为万全寺矿区深部很可能演变成金银矿化。此结论可能对张宣幔枝构造外围深部找矿有一定的启示意义。     

张家口万全寺银矿的成矿作用与深部找矿

万全寺银矿是张宣幔枝构造东缘盖层中的一个中型银矿床,现主要开采Ⅴ号、Ⅱ号矿脉。本文以幔枝构造理论为指导,通过对矿床地质背景、矿田构造特征、成矿物质来源、矿脉规模垂向变化、矿床成因等方面的研究,笔者认为万全寺银矿深部仍有很大的找矿潜力。另外,往深部金品位明显增高,具有从浅部银矿往深部逐渐变为银金矿、甚至金银矿的趋势。深部地质找矿应该引起高度重视。     

泰安—莱芜地区幔枝构造与铁金铜矿床成矿潜力

泰莱幔枝构造包括幔枝核部(岩浆-变质杂岩)、外围沉积盖层中的拆离滑脱构造和上部幔枝上叠构造三部分构成。认为泰安—莱芜地区铁金铜矿找矿突破很大可能在泰莱幔枝滑脱层构造中,也可能是寒武系、奥陶系中的隐爆角砾岩型金矿或夕卡岩型金矿;崅峪岩体近EW向与近SN向交汇处为含矿流体活动主通道,EW向构造成铁矿,崅峪岩体深部可能有大规模铁矿;NNW向构造成金矿,崅峪岩体中部深处可能有富金矿。     

地幔热柱多级演化及其幔枝构造成矿控矿——以胶西北郭家店幔枝构造为例

文章简要介绍了幔枝构造成矿理论,探讨了幔枝构造的特征、单元划分、断裂构造体系以及成矿控矿作用。在燕山运动晚期,华北东部地区进入了以伸展构造为主的地幔热柱演化阶段,在胶西北地区形成了莱阳地幔亚热柱及其外围郭家店、栖蓬、牟乳等幔枝构造。其中,郭家店幔枝构造于燕山运动晚期发生强烈的构造活动,总体形成了以焦家断裂为主的拆离带和与其相交的以三山岛断裂为反向铲状断裂的构造体系,同时控制着玲珑、焦家、三山岛等一系列大型—超大型矿床的形成。在众多成矿控矿因素中,区域性断裂构造是重要的主导性因素,既为成矿流体的运移提供了通道,又为成矿储矿提供了有利空间。深源含矿流体可通过地幔热柱→地幔亚热柱→幔枝构造→有利构造扩容带,即脆韧性-韧脆性剪切带、侵入岩体的内外接触带、密集的构造裂隙带、各种脉岩与围岩的接触带等有利构造部位集聚成矿。近年来在胶西北深部勘查发现,浅部沿断裂展布的若干个大—中型金矿在其深部的成矿蚀变构造带可能是连为一体的,一起组合成为超大型金矿。      

幔枝构造外围主拆离带型金矿特征——以尖宝山金矿为例

幔枝构造是地幔热柱多级演化的第三级构造单元 ,其核部变质—岩浆杂岩隆起与外围盖层之间的主拆离带体系是很好的成矿控矿构造。尖宝山金矿是冀东幔枝构造北侧主拆离带型金矿。目前勘探范围主要是铲状断裂控制的矿体。具有矿体较连续、延伸较稳定的特征 ,有中大型成矿远景。     

地幔热柱多级演化及其成矿控矿研究:以张-宣幔枝构造研究为例

张-宣地区是河北省金银多金属矿床集中区,可划分出以宣化-崇礼-赤城-带岩浆-变质杂岩区为中心的金矿集中区和外围盖层区的银多金属矿分布区.近年研究表明,金银多金属成矿物质主要来自地球深部,通过地幔热柱多级演化向上迁移,并在幔枝构造的有利构造扩容带中集聚成矿.分别以幔枝构造核部的东坪金矿、拆离带的黄土梁金矿和外围断陷盆地中...     

太行山中段石湖金矿控矿构造分析

以幔枝构造成矿理论为指导,根据石湖金矿的地质特征、成矿物质来源、矿石品位变化、成矿控矿构造分析,指出石湖金矿区深部及外围均具较大找矿潜力。     

华北东部盆山耦合与内生成矿作用

盆-山耦合关系是当今地学研究的前沿课题。但是,在几何学上,成对盆山耦合论述较多。而华北东部裂陷盆地则西与太行造山带、北与燕山造山带、东与胶辽山地、南与大别造山带均构成盆-山耦合,即中心裂陷盆地与外围各造山带均为耦合关系。研究表明:中心裂陷与华北地幔亚热柱的形成密切相关,由于地幔亚热柱强烈上隆,在岩石圈底部受阻,使华北东部岩石圈发生热减薄-断陷的同时,向外拆离的地幔岩在盆地外围形成一系列次级隆起(太行、燕山、胶辽、大别造山带),即地幔热柱多级演化的第三级单元———幔枝构造。各幔枝构造(造山带)间具有明显的可比性,并共同与中心裂陷盆地构成盆-山耦合关系。与此同时,随地幔热柱-亚热柱-幔枝构造向上迁移的成矿元素,亦以气态-气液混合态-含矿流体的形式向上迁移,并最终在幔枝构造的有利聚集部位成矿,形成张宣、冀东、辽东、胶东、鲁西、小秦岭、阜平等幔枝构造成矿集中区。     

新的构造控矿类型——螺旋构造控矿

概括天宝山新兴角砾岩筒铅锌矿,山东七宝火山岩型金矿,安徽铜陵凤凰山铜矿,辽宁簸箕山磷矿,辽宁清源红透山铜(锌)矿等构造控矿实例的解读,表明它们可建立一种新的构造控矿类型——螺旋构造控矿。受幔团螺旋运动上冲的地幔热柱多级浸演化的幔枝构造制约。     

Analysis of the ore-controlling role of Guojiadian mantle branch structure, Northwest Shandong Peninsula, China

Metallogenesis in the gold ore-concentrated zone of Northwest Shandong Peninsula is closely related to deep processes.The region in the eastern part of North China entered into the stage of mantle plume evolution during the Yanshanian movement,following the long-time stage of stable platform evolution during Paleozoic time.At that time,the ore-concentrated zone of Northwest Shandong Peninsula just entered into the development-evolution stage of the Laiyang sub-mantle plume and the Guojiadian mantle branch structure in its periphery.The core-mantle-source gold was present in the gas-liquid form,and it migrated through mantle plume→sub-mantle plume→mantle branch structure→favorable tectonic expansion zone to the favorable loci of the mantle branch structure,where gold was deposited as ores,thereafter constituting a series of large-to medium-sized gold deposits distributed around the Guojiadian mantle branch structure.This study also dealt with the Jiaojia fault as the main detachment(fault altered rock) belt on the northwestern margin of the mantle branch structure and also presented a basic cognition about the fact that the Sanshandao fault as the listric fault on the hanging wall of the detachment belt.Furthermore,on this basis,this study also pointed out the orientation for further ore prospecting in this region.     

Mantle Branch Structure in the South-Central Segment of the Da Hinggan Mts.,Inner Mongolia and Its Ore-controlling Role

Abstract: Mantle branch structure is the third tectonic unit of multiple evolution of a mantle branch. It is not only the main mechanism of intercontinental orogeny, but also an important ore-forming and ore-control structure. Studies on geotectonic evolution, regional geological characteristics and ore-forming and ore-control structures have shown that since the Mesozoic the Da Hinggan Mts. region has entered a typical intercontinental orogenic stage, and it is closely related to mantle branch activities. The south-central segment of the Da Hinggan Mts. is a typical mantle branch structure and possesses obvious magmatic-metamorphic complexes in the core, detachment slip beds in the periphery and overlapped fault depression basins. Moreover, all of these are the principal factors leading to ore formation and ore control in the region. This paper also further explores the mechanism of mineralization in the south-central segment of the Da Hinggan, summaries the rules of mineralization, puts forward the models of mineralization and points out future ore-exploring orientation.     

Study on the Metallogenetism of Sub-mantle Plume and Mantle Branches in the Gold Mineralization Concentration Area of Northwest Jiaodong Peninsula

The northwest of Jiaodong peninsula is characterized by its greatest gold concentration area, enormous gold reserves and limited time interval （115±5Ma） of gold mineralization in China. Studies show that the east area of north China began its mantle plume evolution since the Yanshanian movement, and the Laiyang sub-mantle plume and its surrounding mantle branches such as those in Guojiadian, Aishan and Panshidian were formed in the mineralization concentration area of northwestern Jiaodong peninsula. With the development of mantle plume →sub-mantle plume → mantle branch→ favorable expending structures, the deep-derived hydrothermal fluid moved up to the favorable places, such as brittle-ductile or ductile-brittle shearing zones, the internal and external contact zones of intrusions, dense fracturing zones and the contact zones between dikes and countryrocks, and concentrated into deposits. Then the gold mineralization concentration zones that are centralized on mantle branches were formed. This study takes Guojiadian mantle branch as an example to discuss their metallogenetism and conclude the metallogenetic mode.     

水晶屯金矿床稳定同位素地球化学研究

通过对水晶屯金矿床与区域上典型金矿床的硫、铅、氢、氧等稳定同位素的对比研究,阐明本区金矿成矿物质主要来源于太古宇崇礼杂岩,太古宙区域变质作用仅形成金的初步富集,印支-燕山早期的构造岩浆活动促成石英脉主体形成,燕山期继承性构造岩浆活动对先成脉体的叠加改造作用是成矿的重要因素,成矿流体来源于岩浆水.本矿床为具有层控性质的岩浆热液型矿床.     

地幔热柱的多级演化及其成矿作用——以冀北地区为例

冀北地区金、银金金属成矿作用研究表明，金、银等成矿元素除部分萃取自含矿围岩外，主要来自深源。幔枝构造是重要的热源释放体系，控制着深源含矿流 体的迁移，聚集和成矿，从而构成了以幔枝构为中心，内带为金、外带为银金金属的构造－岩浆成矿系列，并据此归纳出幔枝构造成矿模式。