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首页> 外文期刊>The Canadian Mineralogist >AN INTEGRATED FLUID-MINERAL STABLE-ISOTOPE STUDY OF THE GRANITE-HOSTED MINERAL DEPOSITS OF THE NEW ROSS AREA, SOUTH MOUNTAIN BATHOLITH, NOVA SCOTIA, CANADA: EVIDENCE FOR MULTIPLE RESERVOIRS
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AN INTEGRATED FLUID-MINERAL STABLE-ISOTOPE STUDY OF THE GRANITE-HOSTED MINERAL DEPOSITS OF THE NEW ROSS AREA, SOUTH MOUNTAIN BATHOLITH, NOVA SCOTIA, CANADA: EVIDENCE FOR MULTIPLE RESERVOIRS

机译：加拿大新斯科舍省南山区巴索里斯新十字架地区花岗岩包裹矿床的流体-矿物稳定同位素综合研究：证据表明有多个储层

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Granitic rocks in the New Ross area, Nova Scotia, host polymetallic (Cu, Mo, Mn, Sn, U, W), aplite–pegmatite, greisen, and vein-type mineral deposits. The host granitic rocks belong to the Late Devonian (380 Ma) peraluminous South Mountain Batholith (SMB), which consists of several coalesced plutons. Among these, the New Ross Pluton, composed of monzogranite, leucomonzogranite, and leucogranite, is one of the youngest. White mica separates from aplite–pegmatite, greisen, and veins have 18O values between +4.0 and +10.0, and D values between –42 and –108. Fluid-inclusion extracts from quartz in samples from the area of the same deposits have D values between –42 and –97. The isotopic composition of fluids in equilibrium with the white mica and isotopic data for the fluid-inclusion extracts record the transition from an early, orthomagmatic stage, in which magmatic fluid dominated (i.e., aplites, pegmatites), to a subsequent hydrothermal stage (i.e., greisens, veins) where an increasing amount of another fluid, inferred to be meteoric water, infiltrated the systems and mixed with the magmatic fluid. In addition, the low D values for fluid-inclusion extracts compared with the Dfluid values calculated for coexisting white mica samples are considered to record infiltration of a second meteoric water much later in the evolution of the SMB. Integration of the new stable isotope data with our previous results on fluid inclusions suggests the following history of fluid evolution within the New Ross area: (1) exsolution of a magmatic fluid at ~600°C, (2) incursion of a low-18O, high-D meteoric fluid at ca. 380 Ma through faults, and subsequent mixing with magmatic and metamorphic fluids through circulation by convection before cooling to ~400–500°C, and (3) incursion at a much later time of a low-D meteoric fluid, mostly affecting the composition of fluid-inclusion extracts.
机译：新斯科舍省新罗斯地区的花岗岩中含有多金属 （铜，钼，锰，锡，铀，钨），云母-斜晶石，格里森和 静脉-类型的矿床。宿主花岗岩属于 晚泥盆纪（380 Ma）的高铝质南方山基岩（SMB），由几个合并的云母组成。其中， 新罗斯普卢顿（New Ross Pluton）是最年轻的一种，它由单长花岗岩，白云母花岗岩， 和无色花岗岩组成。白云母 与磷灰石–斜晶石，greisen和静脉分离， 18 O值 在+4.0和+10.0之间，D值在–42之间和–108。 来自相同矿床区域 的石英样品中的夹杂物提取物的D值介于–42和–97之间。 与白色 云母处于平衡状态的流体的同位素组成和流体包裹体提取物的同位素数据记录了 从早期正磁浆阶段的转变，其中 < / sup>岩浆流体占主导地位（即，成岩，伟晶岩），进入随后的 热液阶段（即，巨脂岩，脉），其中另一种流体的 量增加是流水，渗透到 系统中并与岩浆流体混合。另外， 流体包裹体提取物的低D值与为共存的白云母样品 计算的D 流体值相比sup>被认为是在SMB演化的更晚阶段记录了第二颗大气水的渗透。新的 稳定同位素数据与我们先前关于流体包裹体的结果 的整合建议了在 New Ross区域内流体演化的以下历史：（1 ）岩浆流体在〜600°C时的析出， （2）大约在20°C侵入了低 18 O高D流星流体通过断层形成380 Ma，随后通过对流循环与岩浆和变质 流体混合，然后冷却至〜400–500°C， 和（ 3）在更晚的时间进入低D流星流体， 主要影响流体包裹体提取物的成分。

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    《The Canadian Mineralogist》 |2004年第5期|p.00001425-00001441|共17页
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