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首頁> 外文期刊>Precambrian Research >Fluid-rock interaction during high-grade metamorphism: Instructive examples from the Southern Marginal Zone of the Limpopo Complex, South Africa
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Fluid-rock interaction during high-grade metamorphism: Instructive examples from the Southern Marginal Zone of the Limpopo Complex, South Africa

機譯：高級變質(zhì)過程中的流體-巖石相互作用：來自南非林波波綜合體南部邊緣帶的示例性實例

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The Southern Marginal Zone of the Limpopo Complex documents strong evidence that CO_2-rich (X_(CO_2)~(fluid) = 0.7-0.9, X_(H_2O)~(fluid) =0.1-0.3) and brine fluids of greatly reduced water activity interacted with cooling metapelitic granulite during the thrust-controlled emplacement at 2.69-2.62 Ga onto the granitegreenstone terrain of the northern Kaapvaal Craton. Interaction of cooling metapelitic granulite with CO2-rich fluids at T<600-630°C and P<~6kbar is recognized by the presence of a regional retrograde Opx-out/Ath-in isograd and an associated zone of retrograde hydrated granulites that occupies ~4500km2 of retrogressed crust located in the hanging wall section of the shallow north-dipping Hout River Shear Zone that bounds the Southern Marginal Zone in the south. On the other hand, brine fluids are considered to have triggered the main pulse of anatexis that resulted in production of large volumes of granodioritic-trondhjemitic melts that intruded and started to interact with metapelitic granulite in the deep crust at T> ~900°C, P> ~7.5kbar. Interaction of hot melt with metapelitic granulite continued until final emplacement in the middle crust (P = ~6kbar, T = ~630°C). Brine fluids also initiated shear zone-hosted metasomatism of quartzo-feldspathic gneisses at T between ~600 and ~900 °C and amphibolite-facies lode-gold mineralization. Available data implicate devolatilization of underthrusted greenstone material as the dominant deep crustal source for infiltrating CO_2-rich and brine fluids.
機譯：林波波河群南部邊緣帶的有力證據(jù)表明，富含CO_2（X_（CO_2）?（流體）= 0.7-0.9，X_（H_2O）?（流體）= 0.1-0.3）和鹽水的水活度大大降低在2.69-2.62 Ga的推力控制下向北部Kaapvaal Craton的花崗綠巖地形上與冷卻的變質(zhì)花崗石相互作用。在區(qū)域T <600-630°C和P ?900°C的深地殼中的變質(zhì)粒狀體發(fā)生相互作用， P＞?7.5kbar。熱熔體與變質(zhì)花崗巖的相互作用一直持續(xù)到中地殼最終進入地殼為止（P =?6kbar，T =?630°C）。鹽水在T介于約600至?900°C的溫度下還引發(fā)了石英長石質(zhì)片麻巖的剪切帶寄主交代作用和閃石巖相金礦化作用。現(xiàn)有數(shù)據(jù)表明，下沖綠巖材料的脫揮發(fā)分是滲透富含CO_2和鹽水的主要深層地殼來源。

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