青海与基性—超基性岩有关的玉石矿     

李林安 《青海地质科技情报》1996,(1):16-22

青海省与基性－超基性岩有关的玉石矿，主要包括两类；钙铝榴石质玉和蛇纹石质玉。根据笔者的调查，以及有关的信息资料，本文着重对钙铝榴石质玉的基本特征作一介绍。  相似文献   

矽卡岩型符山石玉—回龙玉石矿的发现及玉石特征   总被引：1，自引：0，他引：1  

钟华邦 《矿产与地质》1996,10(4):256-258

产于河南桐柏回龙地区的矽卡岩型符山石玉，通过镜下鉴定，能谱、光谱、电探测试分析，认为回龙玉是由多种矽卡岩矿物集合体组成的岩石。其中呈黄绿色色调均匀半透明的回龙玉，主要由符山石矿物集合体组成。矿物颗粒极细，质地细腻，硬度为７．比重３．２～３．４。研究后认为回龙玉矿是在高温低压的环境下，迅速冷凝后形成的特殊矽卡岩型矿床。  相似文献   

历史沧桑话美玉     

亓润章  钱雪明 《火山地质与矿产》1997,18(1):56-60

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陕西省宝玉石资源简况及对其今后工作     

李明昌 《陕西地质科技情报》1989,(1):6-8,108

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籽料和田玉的特征     

王久华 《山东地质》2008,(11):60-60

和田玉的籽料是相对于山料、山流水料而产生的,是玉石界自古相沿承袭的名词。在《珠宝玉石国家标准》中并没有将和田玉区分出籽料、山料、山流水料。籽料和田玉在收藏界一向享有玉石至尊地位,因其价格昂贵,市场上赝品泛滥,不可不辨。  相似文献   

玉石之王——翡翠     

郑普红  吴卫红  刘德镒 《国土资源导刊(湖南)》2008,5(5)

翡翠(Jadeite)为古今"玉石之王",人们只要获得一小块特级或优质天然翡翠,就有可能变成百万富翁.因为,翡翠与钻石、红宝石、蓝宝石、祖母绿等高档宝石一样,千百年来一直是人们追逐的对象.翡翠名称来源于一种鸟--翡翠鸟,雄鸟羽毛红艳称为翡鸟,雌鸟羽毛翠绿称为翠鸟.翡翠主要产于缅甸北部密支那地区,因此,国际市场上称翡翠为"东方宝石".  相似文献   

国石之哀:如何向子孙交代?     

黎松峭 《南方国土资源》2007,(5):1-1

据新华社电,最近一段时期以来,在一路飙升的玉价和一夜暴富的故事诱惑下,全国各地近20万的采玉人来到玉龙喀什河采玉.目前,滥采乱挖已使盛产新疆和田玉的玉龙喀什河千疮百孔,生态植被遭到严重破坏.专家表示,这种耗尽资源的掠夺性开采再不禁止,亿万年沉积玉龙喀什河的和田玉将被掏尽.制止玉龙喀什河流域非法采玉石行为迫在眉睫.  相似文献   

祁连造山带玉石沟地幔橄榄岩中挥发分的流体化学和稳定同位素组成及古大洋岩石圈演化意义     

胡沛青张铭杰  汤中立LI Chusi 王记周 《岩石学报》2007,23(1):169-176

Fluid inclusions in olivine and orthopyroxene of mantle peridotites from the Yushigou ophiolite can be divided into three types based on decrepitation temperature,shape and distribution.Type-1 fluid inclusions are characterized by oval or negative crystal shapes and small size(<5μm across).They occur in the cores and mantles of the host crystals,and decrepitated at>840℃.Type- 2 fluid inclusions have irregular or tabular shapes with relatively large size(10～100μm in length).They occur in irregular or circular healed micro-fractures in the host crystals,and decrepitated at 612～710℃.Type-3 fluid inclusions have size and shape,similar to type-2 fluid inclusions but occur in micro-fractures restricted to the margins of the host crystals,and decrepitated at much lower temperature from 190℃to 340℃.The three different types of fluid inclusions are interpreted to represent primary,metasomatic (pseudo-secondary)and secondary inclusions,respectively.Stepwise heating reveals three concentration peaks of volatiles at 200～400℃,400～800℃and 800～1200℃released from olivine and orthopyroxene in harzburgite and dunite from the Yushigou ophiolite, which are considered to correspond to the decrepitation of secondary,metasomatic and primary fluid inclusions at similar temperature ranges.CO2 is a major constituent in the volatiles released at three different temperature intervals.Trace amounts of H_2 and N_2 are present in the volatiles released at<800℃and trace amounts of H_2O and SO_2 are mainly present in the volatiles at 400～800℃.TheδD(-95.2‰,-306.3‰)of H_2O and theδ~(13)C(-15.5～-12.5‰)andδ~(18)O values(1.4～1.9‰)of CO_2 released at<800℃are lower than normal mantle values and suggest the mixing origin of crustal fluids( sedimentary organic)with ocean water,implying that Yushigou AOLM had undergone an intensive metasomatism by a fluid composed of CO_2.H_2O and SO_2,and followed by degassing. In contrast,the volatiles released at 800～1200℃are characterized by trace amounts of H_2 and CO in dunite and SO_2 in harzburgite, much lighterδ~(13)C(-29.1‰～-19.5‰),heavierδ~(13)O(8.8‰)of CO_2 and positive relationship between these isotopic ratios and the concentration of CO_2.Such features can be best explained by mixing of significant terrestrial crustal(organic)and minor mantle volatiles.We proposed that the Yishigou peridotites are more likely to have derived from a continental lithosphere instead of an oceanic lithosphere comprising the Yishigou gabbros and pillowed basalts.A supra-subduction tectonic setting is thus inferred for the Yushigou ophiolite.  相似文献   

古大洋岩石圈地幔流体组成——来自玉石沟地幔橄榄岩的证据     

胡沛青  张铭杰  孟广路  傅飘儿  李延鑫 《矿物岩石地球化学通报》2007,26(Z1)

蛇绿岩底部地幔橄榄岩是认识古大洋岩石圈地幔流体的典型样品.采用分步加热质谱法测定了北祁连玉石沟蛇绿岩底部斜辉橄榄岩和纯橄榄岩矿物中流体的化学组成.  相似文献   

玉石洼铁矿伴生钴的赋存状态及综合利用初探   总被引：1，自引：0，他引：1  

戴塔根  龙永珍 《湖南地质》2000,19(1):54-57

玉石洼铁矿伴生的钴含量较高,主要以类质同象形式存在于伴生的黄铁矿中,与硫存在着正相关关系,应用合适的提钴工艺,黄铁矿中大部分的钴可以提取出来。此区钴资源量丰富,如能综合利用,潜在经济效益可观。  相似文献