The magmatic to hydrothermal evolution of the intrusive Mont Saint-Hilaire Complex: Insights into the late-stage evolution of peralkaline rocks
The magmatic to hydrothermal evolution of the intrusive Mont Saint-Hilaire Complex: Insights into the late-stage evolution of peralkaline rocks
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侵入型圣伊莱尔山杂岩的岩浆到热液演化：洞察近碱性岩石的后期演化
DOI：
10.1093/petrology/egr042
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发表时间：
2011
影响因子：
3.9
通讯作者：
Gregor Markl
中科院分区：
文献类型：
--
作者：
Julian Schilling;Michael A. W. Marks;Thomas Wenzel;Torsten Vennemann;László Horváth;Peter Tarassoff;Dorrit E. Jacob;Gregor Markl
加拿大魁北克的白垩纪圣伊莱尔山杂岩包括三个主要的 岩石单位，侵位在以下序列：（一）辉长岩;（二） 闪长岩;（III）多样的部分agpaitic foid正长岩。述主元件 造岩矿物组成、年龄校正Nd和氧同位素 矿物分离数据和铁镁硅酸盐的微量元素数据 不同的岩性意味着所有单元都有一个共同的来源。的分布 辉长岩中单斜辉石中的稀土元素指示为洋岛 母岩浆的玄武岩型成分。辉长岩记录的温度 1200至800 ° C，二氧化硅活性在0·7和0·3之间变化，fO2值在− 0·5和+0 statist7之间（log Δ FMQ， 其中FMQ是铁橄榄石-磁铁矿-石英）。闪长岩在均匀的SiO2（aSiO2 = 0.4 - 0.5）和更低的fO2条件（log Δ FMQ~− 1）下结晶，介于~1100和 约800 ° C。各种层状正长岩的相平衡表明， 活性从~1000 ° C时的0.6 - 0.3降低到~550 ° C时的<0.3。释放一名 在向热液阶段过渡的过程中，含水流体导致aSiO2下降到非常低的值， 从降低的SiO2在含水流体中的溶解度相比， 硅酸盐熔化。在热液阶段，高水活动趋于稳定 沸石族矿物流体包裹体记录了复杂的岩浆期后历史， 其包括捕集从残余地层中分离出来的含水流体 正长岩浆同生水-碳流体包裹体反映了 最新研究中共存的不混溶外部流体的非均相捕获 进化阶段流体包裹体的氧碳同位素特征 CO2和晚期碳酸盐的存在意味着 石灰岩是外部流体的来源。富矿正长岩 圣伊莱尔山的岩石演化如下：首先，碱性，高场 强亲石元素和大离子亲石元素在晚期预富集 岩浆和随后的热液阶段;第二，外部渗透 与碳酸盐岩母岩处于平衡状态的流体以及与 内部流体以及流体-岩石相互作用控制溶解 先存矿物、元素迁移和矿物沉淀 由局部可变参数确定的装配。正是这种热液 内部和外部流体之间的相互作用， 在圣伊莱尔山发现的矿产资源
The Cretaceous Mont Saint-Hilaire complex (Quebec, Canada) comprises three major rock units that were emplaced in the following sequence: (I) gabbros; (II) diorites; (III) diverse partly agpaitic foid syenites. The major element compositions of the rock-forming minerals, age-corrected Nd and oxygen isotope data for mineral separates and trace element data of Fe–Mg silicates from the various lithologies imply a common source for all units. The distribution of the rare earth elements in clinopyroxene from the gabbros indicates an ocean island basalt type composition for the parental magma. Gabbros record temperatures of 1200 to 800°C, variable silica activities between 0·7 and 0·3, andfO2values between −0·5 and +0·7 (log ΔFMQ, where FMQ is fayalite–magnetite–quartz). The diorites crystallized under uniformaSiO2(aSiO2= 0·4–0·5) and more reducedfO2conditions (log ΔFMQ ~ −1) between ~1100 and ~800°C. Phase equilibria in various foid syenites indicate that silica activities decrease from 0·6–0·3 at ~1000°C to <0·3 at ~550°C. Release of an aqueous fluid during the transition to the hydrothermal stage causedaSiO2to drop to very low values, which results from reduced SiO2solubilities in aqueous fluids compared with silicate melts. During the hydrothermal stage, high water activities stabilized zeolite-group minerals. Fluid inclusions record a complex post-magmatic history, which includes trapping of an aqueous fluid that unmixed from the restitic foid syenitic magma. Cogenetic aqueous and carbonic fluid inclusions reflect heterogeneous trapping of coexisting immiscible external fluids in the latest evolutionary stage. The O and C isotope characteristics of fluid-inclusion hosted CO2and late-stage carbonates imply that the surrounding limestones were the source of the external fluids. The mineral-rich syenitic rocks at Mont Saint-Hilaire evolved as follows: first, alkalis, high field strength and large ion lithophile elements were pre-enriched in the (late) magmatic and subsequent hydrothermal stages; second, percolation of external fluids in equilibrium with the carbonate host-rocks and mixing processes with internal fluids as well as fluid–rock interaction governed dissolution of pre-existing minerals, element transport and precipitation of mineral assemblages determined by locally variable parameters. It is this hydrothermal interplay between internal and external fluids that is responsible for the mineral wealth found at Mont Saint-Hilaire.
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