电气石记录了Murguía底辟周围与Zn-Pb矿化有关的热液事件。

IF 1.3 4区地球科学 Q2 GEOLOGY

Geologica Acta Pub Date : 2019-06-05 DOI:10.1344/GEOLOGICAACTA2019.17.5

R. Galdos, Angels Canals i Sabaté, E. López, Joaquín Moreno

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引用次数: 0

摘要

电气石的化学成分已被用作宿主环境登记册以及潜在的矿床勘探工具。在本研究中，对Murguia底辟（西班牙北部巴斯克-坎塔布里安盆地）周围与Zn-Pb矿化有关的电气石的结构和化学成分进行了检查，以验证它们是否记录了该地区的矿化事件。从岩石学角度来看，电气石已被区分为继承电气石和自生电气石。无色自生电气石以光环的形式存在，部分围绕绿色和多色碎屑颗粒，或以单个晶体的形式存在。继承电气石和自生电气石的化学性质也不同。自生电气石显示出不同的X位占有率，Mg/（Mg+Fe）比高于0.77，并且富含铝，并且在火山灰岩-氧化镁石连接的右侧，在火山灰石连接的上方绘制。继承电气石在碱性（Na+K）组域内绘图，并且具有低于0.77的Mg/（Mg+Fe）比。这些数据表明，自生电气石在还原条件下生长，与底辟上升过程中导致矿石沉积和盖层形成的热液事件相兼容。

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Tourmaline records hydrothermal events related to Zn-Pb mineralization around the Murguía diapi.

The chemical composition of tourmaline has been used as a host environment register as well as a potential exploration tool for mineral deposits. In this study, the textural and chemical composition of tourmalines associated with Zn-Pb mineralizations around the Murguia diapir (Basque Cantabrian Basin, N Spain) are examined to verify if they record the mineralizing events in the area. Petrographically, tourmalines have been differentiated between inherited and authigenic. Colorless authigenic tourmalines are present as halos partially around green and pleochroic detrital grains or as individual crystals. Inherited and authigenic tourmalines are also chemically distinct. Authigenic tourmalines show different X-site occupancies, a Mg/(Mg+Fe) ratio above 0.77, and are aluminum rich and plot to the right of the povondraite-oxidravite join, above the schorl-dravite join. Inherited tourmalines plot within the alkaline (Na+K) group field, and have a Mg/(Mg+Fe) ratio below 0.77. These data suggest that authigenic tourmalines grew under reducing conditions, compatible with the hydrothermal event responsible for the ore deposition and caprock formation during the diapir ascent.

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来源期刊

Geologica Acta 地学-地质学

CiteScore

2.50

自引率

6.70%

发文量

审稿时长

>12 weeks

期刊介绍： - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean