南和沟铜矿床地质特征及成矿地质条件分析     

郭建华 《矿产与地质》2001,15(3):177-180

研究表明南和沟铜矿床受剥离断层和变质热液两重成矿作用控制，具有多因成矿特征。  相似文献   

阿希金矿地质特征及成因初探   总被引：12，自引：0，他引：12  

刘洪林  董连慧 《新疆地质》1992,(2)

阿希金矿产于下石炭统大哈拉军山组,第五岩性段构成的古火山机构西南缘。矿体产出形态及空间分布,严格受近南北向弧形张扭性断裂控制。主矿体呈厚大似板状体,以南北两个富集中心向NE50°倾角侧伏。矿石以石英脉型为主,其次为蚀变岩型。围岩为英安岩和角砾熔岩。属中一低温火山期后热液型金矿床。  相似文献   

北祁连清水沟－白柳沟地区铜、多金属成矿地质条件的分析     

邬介人  于浦生  黄玉春 《西北地质科学》1995,(1)

笔者在该文中着重表达了３方面研究成果：在陈述清水沟－白柳沟地区成矿地质背景基础上，描述了已知工业矿床的基本特征，并将其类比为两类矿床，其一为Ｚｎ－Ｐｂ－Ｃｕ型小铁山式矿床，以展布于郭密寺北火山穹隆北东和南西两侧的下柳沟、弯阳河、下沟及郭密寺矿床为代表；其二为Ｃｕ（－Ｚｎ）型白银厂式矿床，以出露在黑河古火山穹隆北翼近核部的香子沟矿床为实例。成矿前期、成矿时期，以及成矿后期地质条件的分析与概括表明，该地区与白银厂地区在海相火山岩的成岩环境─—裂谷岛弧、火山岩组合──双峰式、古火山机构类型──古火山穹隆，以及成矿机制──海底热液对流循环成矿等诸多方面都具相似性，是寻找铜多金属硫化物矿床的良好地段。提出了该区此类矿床的综合成矿模式，相信它在本地区扩大寻找小铁山式矿床和突破性寻找白银厂式矿床中具有重要指导意义和实际操作意义．  相似文献   

湖南内生金属矿床成矿分带及其与区域地质背景的关系   总被引：2，自引：0，他引：2  

钟九思  杨光辉 《湖南地质》1995,14(4):235-242

湖南主要内生金属矿床的成矿作用，存在明显的分带性，自南东向北西，成矿元素逐渐减少，成矿温度逐渐降低，由与酸性，中酸性侵入岩有关的矿床为主，渐变为与沉积期后成矿作用有关的层控矿床为主，赋矿层位亦有逐渐降低之规律，据此，可将湖南内生金属矿床划分为４个矿带。燕山期构造岩浆活动，是上述成矿分带的主要原因。  相似文献   

云南宁蒗地区喜山期斑岩带岩石化学特征和岩浆来源与成矿     

徐旃章  张寿庭 《矿物岩石》1995,15(4):20-29

宁蒗地区喜山期斑岩带为扬子西缘构造活动带喜山期构造－斑岩成矿带的重要组成部分，通过斑岩体岩石化学特征等的综合分析研究，得出了岩浆物质源于幔源，并有陆壳组分参与的壳幔混源型岩浆，斑岩体属含铜斑岩或铜斑岩。斑岩带具良好的成矿地质条件与前景。  相似文献   

Reply to comments by Sinninghe Damsté and De Leeuw (1995) on Li et al. (1995), Organic Geochemistry 23, 159–167     

Maowen Li  S. R. Larter 《Organic Geochemistry》1995,23(11-12)

  相似文献   

甘肃公婆泉铜矿区斑岩岩浆起源及成岩成矿大地构造背景   总被引：9，自引：0，他引：9  

游小毛 《大地构造与成矿学》1999,23(2):167-171

探讨了公婆泉矿区斑岩岩浆起源,论述了该矿区斑岩成岩成矿大地构造背景。研究结果表明,该矿区斑岩岩浆起源属幔壳混合源;斑岩成岩成矿大地构造背景为褶皱造山期。  相似文献   

DIAGNOSIS ON LOW FREQUENCY COMPONENT OF ENSO VARIABILITY—PART Ⅱ:ORIGIN OF THE COMPONENT     

邹力  倪允琪 《Acta Meteorologica Sinica》1997,(1)

Diagnosis is undertaken on the origin for the low-frequency component (LFC) of ENSOvariability in the context of 1979—1990 OLR and u-wind datasets.Evidence suggests that ① apower spectrum-yielded maximum,significant statistically,is derived from the OLR monthlyanomalies in a 3—5-year period range over the tropical central/western Pacific;②compositeanalysis of the signals of the monthly anomaly low frequency component (period>3 years)confirms further the dynamic features of the component as documented in Part Ⅰ:③serving asforcing on ENSO,the related monsoon region represents the source area of the component;④theone-point correlation maps of unfiltered OLR monthly anomalies with zonal wind on a lagged,asimultaneous and a leading basis show clearly the close relation between the u wind-associatedeastward travelling low-frequency wave and the low-frequency oscillation of low-latitude central/western Pacific large-scale convection and the east-moving mode is likely to be excited by theoscillation at a 3—5-year period range.It follows that the large-scale convection oscillation showsup as the origin of the eastward waves,i.e.,ENSO LFC.  相似文献   

Characteristics of melt inclusions in skarn minerals from Fe,Cu(Au) and Au(Cu) ore deposits in the region from Daye to Jiujiang   总被引：5，自引：0，他引：5  

赵斌  赵劲松  李兆麟  张重泽  彭卓伦 《中国科学D辑(英文版)》2003,46(5):481-497

The skarns and skarn deposits are widely distributed at home and abroad. The skarn deposits include many kinds of ores and higher ore grade. Some of them are broad in scale. Scientists of ore deposits from different countries have paid and are paying grea…  相似文献   

Planetary Embryos Never Formed in the Kuiper Belt     

A. MorbidelliC. Jacob  J.-M. Petit 《Icarus》2002,157(1):241-248

We study the orbital evolutions of various systems of planetary embryos in the transneptunian region, undergoing mutual scattering and perturbations from the giant planets. We show that about 15-20% of the original embryos should survive in the transneptunian region at the current epoch. The orbital dispersion of the surviving embryos depends on their individual mass, so that only lunar mass embryos could survive with semimajor axis smaller than 50 AU. In all cases, we show by a Monte Carlo model that at least one of the surviving embryos should have already been discovered by one of the most effective Kuiper-belt surveys. This implies that planetary embryos did not form in the transneptunian region (or have been removed by some external and unknown mechanism). Therefore, we conclude that the Kuiper belt was not excited by resident planetary embryos, unlike the asteroid belt. We also compute with the Monte Carlo model that a significant number (order 10) of Pluto-size bodies could exist only on very eccentric and long-periodic orbits, typical of the scattered disk, while the existence of about 30 bodies brighter than absolute magnitude 4 in the classical belt is compatible with the discovery of Varuna by the Spacewatch survey.  相似文献