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首页> 外文会议>Materials Research Society Symposium >Geochemistry of hydrothermal veins containing zirconolite and betafite at Adamello, Italy
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Geochemistry of hydrothermal veins containing zirconolite and betafite at Adamello, Italy

机译：含有锆醇和含有ZIRAMELLO，意大利的热静脉的地球化学

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Hydrothermal veins containing zirconolite and betafite occur in dolomite marbles at the contact with a tonalite intrusion of the Adamello batholith, Italy. The veins display four distinct mineral zones and are highly enriched in Th, U, Ti, Zr, Nb, and rare earth elements (BEE) relative to their host rock. Wide ranges in concentration of these elements and distinct interelement fractionation trends exist across the four vein zones. The behavior of Th closely reflects that of P, Ti, Nb, and heavy REE, but was distinct from that of U, Zr and light BEE (La to Sm). The presence and composition of refractory minerals such as zirconolite, betafite, uraninite, thorianite, baddeleyite, rutile, allanite, and aeschynite provide evidence for the transport of Ti, Zr, Nb, BEE, and actinides by a fluid, which was further characterized by a low pH and high contents of F, P, Cl and H{sub}2S. Thermodynamic analysis of these veins indicates that they were formed at 550-600 °C, 200 MPa total pressure, and from a fluid derived from the tonalite. Mineralogical and textural observations suggest that crystallization of the refractory minerals was in part induced by precipitation of fluorapatite and sulfides. The geochemical data further indicate that precipitation of light REE was induced by the fluid/wall-rock interaction which led to a significant dilution of the fluid by CO{sub}2. The studied veins provide an example of high-temperature transport of actinides and REE in the Earth's crust and show that these elements can be precipitated from a fluid and subsequently immobilized by zirconolite and betafite, two important actinide hosts in ceramic nuclear waste forms.
机译：含有锆醇和贝肼的水热静脉发生在白云岩大理石中，与意大利亚麦芽岩浴池的铜矿侵入。静脉显示四个不同的矿泉区，相对于其主体岩石，高度富集，U，Ti，Zr，Nb和稀土元素（蜜蜂）。在四脉冲区中存在这些元素的浓度和不同的时隙分级趋势的宽范围。 Th的行为密切反映了P，Ti，Nb和重型ree，但与U，Zr和Light Bee（La至Sm）不同。稀土化矿物质如锆石，贝加钛矿，铀酸盐，胸壁，Baddeleyite，金红石，亚丙酸盐和Aeschynite等难治性矿物质的存在和组成为通过流体提供的Ti，Zr，Nb，Bee和散发物的证据提供了进一步的特征低pH和高含量的f，p，cl和h {sub} 2s。这些静脉的热力学分析表明它们形成为550-600℃，200MPa的总压力，以及来自旋转四氧化钛的流体。矿物学和纹理观察表明，耐火矿物的结晶是通过氟磷灰石和硫化物的沉淀诱导的部分。地球化学数据进一步表明，通过流体/壁岩相互作用诱导了光圈的沉淀，其通过CO {} 2导致了流体的显着稀释。所研究的静脉提供了地壳中的散光和钢丝高温输送的一个例子，并表明这些元素可以从流体中沉淀并随后通过锆沸石和βafite固定，两种重要的陶瓷核废料形式中的两个重要的神经胶质宿主。

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