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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Preliminary mineralogical and petrlogical study of the Ortosa Au-Bi-Te ore deposit:a reduced gold skarn in the northern part of the Rio Narcea Gold Belt, Asturias, Spain
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Preliminary mineralogical and petrlogical study of the Ortosa Au-Bi-Te ore deposit:a reduced gold skarn in the northern part of the Rio Narcea Gold Belt, Asturias, Spain

机译：矿物质矿物质矿物学和Petrlogical研究ortosa au-bi-te矿床：Rio Narcea金带，阿斯图里亚斯，西班牙阿斯图里亚斯北部的黄金矽卡岩

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摘要

The Ortosa deposit (NW Spain)in the northern part of the Rio Narcea Gold Belt (RNGB)is located in the Cantabrian Zone of the Iberian Massif. This zone corresponds to the westernmost exposure of the European Hercynides. The deposit is hosted by marine shales, siltstones, calcareous siltstones and interbedded sandy lmestones of the upper part of the Silurian Furada Formation. These rocks are intruded by a main stock and numerous sills and dikes consisting of a reduced, ilmenite-bearing quartz-monzodiorite (Ortosa intrsion).Skarn metasomatism and associated gold mineralization overprinted these sedimentary and igneous rocks, forming endo-and exoskarns.The earlies stage of alteration involved postassium metasomatism from which metasomatic biotite developed in the hornfels around the intrusion. In the endoskarn, the first metasomatic mineral to form is actinolite.Subsequently,quartz,pyroxene (Hd_(30-45)),and sulfides (mainly arsenopyrite and pyrrhotite)formed, followed by a second generation of amphibole (ferroactinolite and ferohornblende).The exoskarn is a pyroxene-garnet skarn, which is often banded. The prograde minerals are pyroxene (Hd_(10-30))and grossular garnet. The retrolgrade mineralogy consists of hedenbergite-rich pyroxene (Hd_(50-87)),amphibole (ferroactinlite-ferrohornblende),and the metallic minerals with minor fluorapatite, K-feldspar, albite, epidote-clinozoisite, vesuvianite ad calcite. A final stage of retrograde alteration is characterized by calcite, quartz, and chlorite.Pyrrhotite and arsenopyrite are the more abundant metallic minerals, and lollingite, chalcopyrite, pyrite and sphalerite are present in smaller amounts. The gold occurs as native gold and maldonite, and is accompanied by hedleyite, native bismuth, and bismuthinite. These Au-Bi-Te mineral assemblages occupy cavities and fractures in the arsenopyrite or in the pyrrhotite.Estimated physiochemical conditions of formation base on the composition and stability fields of major calc-silicate and sulfide minerals indicate that the hedenbergite-rich 9pyroxene and the earliest sulides (lollingite-pyrrhotite-arsenopyrite) crystallized at temperatures between 470 and 535deg C at low log fS_2 between-10 and 6.5 and low logfO_2 of -22. The Ortosa skarns can be included in the reduced gold skarn subtype defined by Meinert (Mineralogical Association of Canada,Quebec city,Que.,Canada,1998,26,359-414).
机译：Rio Narcea金带（RNGB）北部的Ortosa押金（NW Spain）位于伊比利亚墓地的坎塔布里亚地区。该区域对应于欧洲欧洲国家的最根本曝光。押金由海洋购，淤泥，钙质石灰石和硅藻土上部上部的互粘土的桑迪陶瓷托管。这些岩石由主要的库存和大量的岩石和堤防，由含有减少的Ilmenite的石英 - 单泽岩（Ortosa Intrsion）组成.skarn弥补和相关的金矿化叠印这些沉积和火岩，形成了内部和exoskarns。exheries改变阶段涉及乳腺素的后溶血性，从中侵入中的角质型生物仪。在endoskarn中，第一种态态矿物形成是散剂石。使用，石英，辉石（HD_（30-45））和形成的硫化物（主要是砷吡啶沸石和PyrrHotite），其次是第二代锥形态（铁蛋白和Ferohornblende）。 Exoskarn是一种粉红烷 - 石榴石矽卡车，通常是带状的。 Prograde矿物质是辉石（HD_（10-30））和Grossular Garnet。转胶矿物学由富含海内伯氏石富石（HD_（50-87）），锥（铁酰氨基莱哌菌素 - 铁红霉）和含有次要荧光石，K-FELDSPAR，ALBITE，Epidote-ClinozoIisite，VeSuvianite AD方解石的金属矿物质组成。逆行改变的最后阶段的特征在于方解石，石英和氯酸盐。吡咯酸盐和阿塞枯石是更丰富的金属矿物质，而Lollingite，黄铜矿，黄铁矿和闪锌矿较少。黄金发生作为原生金和马尔尼岩，并伴随着海西特，铋和铋素。这些Au-Bi-TE矿物组合占据亚苯甲酸盐或Pyrhotite中的空腔和骨折。主要钙硅酸盐和硫化物矿物质的组合物和稳定性领域的形成基础的形成基础的生理化学条件表明，富含亚丁伯氏的9pyroxene和最早硫胺（Lollingite-Pyrrhotite-arsenopyrite）在470和535deg C的温度下在-10和6.5之间的低对志Fs_2和-22的低logfo_2之间结晶。 Ortosa Skarns可以包含在Meinert（加拿大矿物学协会，魁北克市，Que，Canada，Canada，1998,26,359-414）中的缩减Gold Skarn亚型中。

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