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首頁> 外文OA文獻(xiàn) >Fluid-rock interaction in retrograde granulites of the Southern Marginal Zone, Limpopo high grade terrain, South Africa
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Fluid-rock interaction in retrograde granulites of the Southern Marginal Zone, Limpopo high grade terrain, South Africa

機(jī)譯：南非林波波高等級(jí)地形南部邊緣帶逆行粒狀巖中的流體-巖石相互作用

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摘要

Fluid infiltration into retrograde granulites of the Southern Marginal Zone (Limpopo high grade terrain) is exemplified by hydration reactions, shear zone hosted metasomatism, and lode gold mineralisation. Hydration reactions include the breakdown of cordierite and orthopyroxene to gedrite + kyanite, and anthophyllite, respectively. Metamorphic petrology, fluid inclusions, and field data indicate that a low H2O-activity carbon-saturated CO2-rich and a saline aqueous fluid infiltrated the Southern Marginal Zone during exhumation. The formation of anthophyllite after orthopyroxene established a regional retrograde anthophyllite-in isograd and occurred at P-T conditions of ～6 kbar and 610 °C, which fixes the minimum mole fraction of H2O in the CO2-rich fluid phase at ～0.1. The maximum H2O mole fraction is fixed by the lower temperature limit (～800 °C) for partial melting at ～0.3. C-O-H fluid calculations show that the CO2-rich fluid had an oxygen fugacity that was 0.6 log10 units higher than that of the fayalite-magnetite-quartz buffer and that the CO2/(CO2+CH4) mole ratio of this fluid was 1. The presence of dominantly relatively low density CO2-rich fluid inclusions in the hydrated granulites indicates that the fluid pressure was less than the lithostatic pressure. This can be explained by strike slip faulting and/or an increase of the rock permeability caused by hydration reactions.
機(jī)譯：流體滲入南部邊緣帶（林波波河高等級(jí)地形）的逆行粒狀巖中的例子有水合作用，剪切帶交代作用和金礦成礦作用。水合反應(yīng)包括堇青石和鄰位鄰苯二酚分解為鐵氧體+藍(lán)晶石和直閃石。變質(zhì)巖石學(xué)，流體包裹體和野外數(shù)據(jù)表明，在挖掘尸體時(shí)，低H2O活性的碳飽和的富含CO2的水和鹽水溶液滲入了南部邊緣帶。在鄰苯二甲酚后的直閃石的形成建立了一個(gè)區(qū)域逆行直閃石的等當(dāng)量，并在?6 kbar和610°C的P-T條件下發(fā)生，這將富含CO2的流體相中H2O的最小摩爾分?jǐn)?shù)固定在?0.1。最大的H2O摩爾分?jǐn)?shù)由下限溫度（約800°C）固定，以使部分熔融溫度約為0.3。 COH流體的計(jì)算表明，富CO2流體的氧逸度比鐵橄欖石-磁鐵礦-石英緩沖液的氧逸度高0.6 log10個(gè)單位，并且該流體的CO2 /（CO2 + CH4）摩爾比為1。在水合顆粒巖中占主導(dǎo)地位的密度相對(duì)較低的富CO2流體包裹體表明，流體壓力小于巖石靜壓力。這可以通過走滑斷層和/或水合反應(yīng)引起的巖石滲透性增加來解釋。

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