巴黎盆地及其Variscan基底界面萤石-重晶石矿化成因:流体包裹体化学和同位素(O、H、Cl)组成的启示

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2023-10-05 DOI:10.1007/s00126-023-01219-2
Louise Lenoir, Thomas Blaise, Diana Chourio-Camacho, Antonin Richard, Alexandre Tarantola, Pierre Agrinier, Thomas Rigaudier, Gaël Monvoisin, Gérard Bardoux, Benjamin Brigaud, Jocelyn Barbarand
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引用次数: 0

摘要

我们为位于巴黎盆地南部和法国中部地块北缘不整合面之间的两个F-Ba矿床的流体流动系统提供了新的约束条件。我们使用显微测温和整体破碎浸出分析来确定矿化流体的同位素比率(δ18O, δD, δ37Cl),以及由萤石携带的流体包裹体的阳离子和阴离子组成。氯度和Cl/Br摩尔比(212-521)表明有卤水参与,其来源可能对应于三叠纪蒸发海水,与附近保存的潮上白云岩相相容。显微测温显示高Ca/Na比值,表明其卤水成分来源于Variscan基底的热液蚀变和宿主沉积岩的部分溶蚀和置换。δ37Cl值低于蒸发海水的预期值,表明在富粘土层中存在离子过滤作用。萤石结晶温度最低为70 ~ 110℃,比寄主三叠纪沉积岩温度高10 ~ 40℃。上升的盐水在早白垩世被排出,经历了压力和温度的下降,同时可能与沉积岩中富含so4的孔隙水混合,导致二氧化硅的沉淀,然后是氟石和重晶石,形成了一个类似于西欧许多地区发现的层控矿床。
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The origin of fluorite-barite mineralization at the interface between the Paris Basin and its Variscan basement: insights from fluid inclusion chemistry and isotopic (O, H, Cl) composition

We provide new constraints for the fluid flow system at the origin of two F-Ba deposits located at the unconformity between the south of the Paris Basin and the northern edge of the French Massif Central. We used microthermometry and bulk crush-leach analyses to determine isotope ratios of mineralizing fluids (δ18O, δD, δ37Cl), together with cation and anion composition of fluid inclusions hosted by fluorite. Chlorinity and Cl/Br molar ratios (212–521) indicate the involvement of a brine, whose origin likely corresponds to Triassic evaporated seawater compatible with supratidal dolomitic facies preserved nearby. Microthermometry reveals high Ca/Na ratios, suggesting that the brine composition evolved from hydrothermal alteration of the Variscan basement and partial dissolution and replacement of the host sedimentary rocks. δ37Cl values are lower than the expected value of evaporated seawater, suggesting Cl isotope fractionation by ion filtration in clay-rich horizons. Fluorite crystallized at minimum temperatures of 70 to 110 °C, 10–40 °C warmer than the host Triassic sedimentary rocks. Ascending brines were expelled during the Early Cretaceous and experienced a drop in pressure and temperature, together with possible mixing with the SO4-rich pore water of the sedimentary rocks, causing precipitation of silica, followed by fluorite and barite, forming a stratabound deposit similar to those found in many areas in Western Europe.

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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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