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首页> 外文期刊>Contributions to Mineralogy and Petrology >Patterns of fluid flow in the contact aureole of the Late Miocene Monte Capanne pluton (Elba Island, Italy): the role of structures and rheology
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Patterns of fluid flow in the contact aureole of the Late Miocene Monte Capanne pluton (Elba Island, Italy): the role of structures and rheology

机译：晚中新世蒙特卡潘纳岩体（意大利厄尔巴岛）的接触极孔中的流体流动模式：结构和流变学的作用

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摘要

Fluid–rock interaction was investigated in the inner aureole of the Late Miocene Monte Capanne pluton on Elba Island (Tuscany, central Italy) by integrating structural, petrological, fluid inclusion, and stable isotope analyses. In the north-western sector of the aureole (Procchio–Spartaia area), calc–silicates alternate with nearly pure carbonate layers at the metre scale. Close to the pluton, the prograde metamorphic sequence includes calc–silicates that transition within a few metres to overlying nearly pure calcite marbles. The calc–silicates are extensively metasomatised to form massive wollastonite-grossular-bearing exoskarn. The mineralogical assemblage found in the marbles and the unshifted carbon and oxygen isotopic ratios in calcite attest that the fluid phase was internally buffered. On the other hand, the calc–silicates constituted channels for infiltration of disequilibrium fluids of magmatic origin. Fluid infiltration was enhanced by hydrofracturing and structurally-controlled by existing planar anisotropies in calc–silicates (layering and lithological boundaries). At the metamorphic peak (～600°C and 1.5–2 kbar), the marble–calc–silicate interface acted as a barrier to fluids exsolved from the crystallising intrusions, separating two different flow patterns in the inner aureole: a high fluid–flux region on its higher grade side (Wol-zone) and a low fluid–flux region on the lower-grade side (Cpx zone). Results of this study: (1) documented that fluid pathways in the aureole rocks at the top of the pluton were largely horizontal, controlled by the lithological layering and the pluton–host rock contact; and (2) elucidated the primary control exerted by the structural and rheological properties of the host rocks on the geometry of fluid flow during pluton emplacement.
机译：通过整合结构，岩石学，流体包裹体和稳定同位素分析，研究了厄尔巴岛（意大利中部托斯卡纳）中新世晚期蒙特卡彭内岩体的内部光环中的流体-岩石相互作用。在光环的西北部（Procchio–Spartaia地区），钙硅酸盐与米级的近乎纯碳酸盐层交替出现。靠近岩体的前移变质层序包括方解石-硅酸盐，这些方解石在几米之内过渡到上覆近乎方解石的大理石。钙硅酸盐被广泛地交代，形成块状硅灰石-钙硅灰石。在大理石中发现的矿物学组合以及方解石中未移动的碳和氧同位素比证明了液相在内部得到了缓冲。另一方面，钙硅酸盐构成了岩浆成因的不平衡流体渗透的通道。通过水力压裂增强了流体的渗透，并通过钙硅酸盐中现有的平面各向异性（分层和岩性边界）控制了结构。在变质峰（〜600°C和1.5–2 kbar）下，大理石–钙–硅酸盐界面充当了从结晶侵入体中溶解出来的流体的屏障，从而分隔了内部金相中的两种不同流动模式：高流体通量高品位侧（Wol区）和低品位通量区域（Cpx区）。这项研究的结果：（1）记录了在岩体顶部的金环岩石中的流体通道在很大程度上是水平的，受岩性分层和岩体与主岩接触的控制； （2）阐明了母岩的结构和流变特性对岩体在胶体注入过程中流体流动的几何形状的主要控制作用。

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    《Contributions to Mineralogy and Petrology》 |2007年第6期|743-760|共18页
  • 作者

    Federico Rossetti; Francesca Tecce; Andrea Billi; Mauro Brilli;

  • 作者单位

    Dipartimento di Scienze Geologiche Università Roma Tre Largo S. Leonardo Murialdo 1 00146 Rome Italy;

    Istituto di Geologia Ambientale e Geoingegneria CNR 00185 Rome Italy;

    Dipartimento di Scienze Geologiche Università Roma Tre Largo S. Leonardo Murialdo 1 00146 Rome Italy;

    Istituto di Geologia Ambientale e Geoingegneria CNR 00185 Rome Italy;

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