Origin and composition of hydrothermal fluids related to the formation of granite-related Sn-W deposits in SW England.

英格兰西南部的铜锡钨矿床与华力西期花岗质岩浆活动及伴生云英岩脉和热液脉有关。Touralloy是这一系列事件的完美记录者，因为它在所有这些阶段都存在丰富的数量，并且它将（除了许多其他微量元素）Cu，Sn和W纳入其结构中。在第一个供资期内，根据其结构背景和是否存在矿石矿物（主要是钙霞石），确定了各代电气石的主要、次要和微量元素组成。为了完成这个项目，我们的目标是详细描述所涉及的流体类型的性质，以了解哪些流体携带成矿元素。因此，预计将完成微量测温研究（加热-冷冻阶段），并通过LA-ICP-MS确定最适合和表征良好的样品的选定流体包裹体的主、次和微量元素组成。为了阐明重要元素的起源，识别流体类型本身的起源将是至关重要的，这将通过分析电气石的O-和H-同位素以及石英的O同位素来实现。有了这个全面的数据集，我们将能够开发一个详细的模型的成因的不同的岩浆热液系统的Cornubian在英格兰西南部的岩基，与花岗岩相关的锡钨矿床一般可能的应用。

Cu-Sn-W deposits of SW England are related to Variscan granitic magmatism and accompanying greisen and hydrothermal veins. Tourmaline is a perfect recorder of this sequence of events as it is present during all these stages in abundant quantities and it incorporates (besides many other trace elements) Cu, Sn and W into its structure. During the first funding period, the major, minor and trace element composition of the various tourmaline generations was determined in relation to their textural context and the presence or absence of ore minerals (mainly cassiterite). To finish up this project we aim to characterize the nature of the involved fluid types in detail in order to understand, which fluid carried the ore-forming elements. It is therefore anticipated to complete the microthermometric studies (heating-freezing stage) and to determine the major, minor and trace element composition of selected fluid inclusions of the best-suited and well-characterized samples by means of LA-ICP-MS. To illuminate the origin of the important elements it will be of fundamental importance to identify the origin of the fluid types themselves, which will be accomplished by analyzing O- and H-isotopes for tourmaline and O isotopes of quartz. With this comprehensive dataset, we will be able to develop a detailed model for the genesis of the diverse magmatic to hydrothermal systems of the Cornubian batholith in SW England, with possible application to granite-related Sn-Wo deposits in general.