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An experimental study of dehydration melting of phengite-bearing eclogite at 1.5―3.0 GPa

Chinese Science Bulletin 2009年第10期54卷 2090-2100页

作者： liu qiang1,2, jin zhenmin1,2 & zhang junfeng1,2 1 {3. key laboratory of Geological processes and mineral resources, china university of geosciences, wuhan 4.0074. china 2 Faculty of Earth Sciences, china university of geosciences, wuhan 4.0074. china state key laboratory of Geological {3. and mineral resources China University of Geosciences Wuhan 430074 China Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China

Dehydration melting experiments were performed on ultrahigh-pressure eclogite from Bixiling in the Dabie orogen at 1.5―3.0 GPa and 800―950℃ using piston cylinder apparatus. The results show that (1) eclogite with ~5% phengite started to melt at T≤800―850℃ and P = 1.5―2.0 GPa and produced about 3. granitic melt; (2) the products of dehydration melting of phengite-bearing eclogite vary with temperature and pressure. Fluid released from dehydration of phengite and zoisite leads to partial melting of eclogite and formation of plagioclase reaction rim around kyanite at pressures of 1.5―2.0 GPa and temperatures of 800―850℃; (3. phengite reacted with omphacite and quartz and produced oligoclase, kyanite and melt at elevated temperatures. Oligoclase is the primary reaction product produced by partial melting of phengite in the eclogite; and (4) the dehydration melting of phengite-bearing eclogite at pressures of 1.5―3.0 GPa and temperatures ≥900 ℃ results in formation of garnets with higher molar fraction of pyrope (3..67 wt.%―45.94 wt.%). Potassium feldspar and jadeite occur at P = 2.4―3.0 GPa and T≥900 ℃ , indicating higher pressure and fluid-absent conditions. Our results constrain the solidus for dehydration melting of phengite-bearing eclogite at pressures of 1.5―3.0 GPa. Combining experi- mental results with field observations of partial melting in natural eclogites, we concluded that phengite-bearing eclogites from the Dabie-Sulu orogen were able to partially molten at P = 1.5―2.0 GPa and T = 800―850℃ during exhumation. The ultrahigh-high pressure eclogites would have experienced partial melting in association with metamorphic phase transformation under different fluid conditions.

关键词：超高压榴辉岩脱水熔融实验水白云母反应压力部分熔融大别造山带苏鲁造山带反应产物

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Eclogite-melt/peridotite reaction: Experimental constrains on the destruction mechanism of the North china Craton

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Science china Earth Sciences 2010年第6期53卷 797-809页

作者： WANG Chao jin zhenmin GAO Shan zhang {3. ZHENG Shu state key laboratory of Geological {3. and mineral resources China University of GeosciencesWuhan 430074China state key laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

To study the mechanism of melt-peridotite reaction pertinent to the destruction of the North china Craton (NCC) lithosphere, a series of experiments were performed at a pressure of 2.0 GPa and temperatures from 1250 to 1400°C using Bixiling eclogite and Damaping peridotite as starting materials. The experimental results show that the reaction between eclogite melt and peridotite causes dissolution of olivine and orthopyroxene and precipitation of clinopyroxene in the melt. The experimental run products, characterized by a lherzolite/pyroxenite/garnet-pyroxenite sequence, are consistent with the mantle xenoliths in the Neogene Hannuoba basalt of the NCC found by liu et al. (2005). It suggests that the mafic lower continental crust was probably recycled into the mantle during the Mesozoic Era. In the experiments conducted at 13.0 and 13.0°C, the resulting melts have a high Mg# andesite signature, indicating that the melt-peridotite reaction may have played a major role in the generation of high Mg# andesite. Our experimental results support the hypothesis that melts derived from foundered eclogite in the asthenosphere will consume the lithospheric peridotites. Therefore, melt-peridotite reaction is an important mechanism for the destruction/thinning of the lithosphere.

关键词： eclogite peridotite melt/peridotite reaction high Mg# andesite delamination destruction of lithosphere

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碰撞造山带地壳深熔作用：来自纳米花岗岩包裹体的观测与实验约束

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地球科学 2019年第12期44卷 4152-4156页

作者：李鑫刘强樊燏章军锋中国地质大学地球科学学院湖北武汉430074 中国地质大学地质过程与矿产资源国家重点实验室湖北武汉430074

在碰撞造山带构造演化过程中,中下地壳深熔作用对于深部地壳物理性质与化学成分具有重要控制作用.作为深熔作用的"见证者",纳米花岗岩包裹体是寄主岩石部分熔融作用的产物,能够为确定陆壳岩石中天然熔体特征及分析熔融机制提供关键信息... 详细信息

在碰撞造山带构造演化过程中,中下地壳深熔作用对于深部地壳物理性质与化学成分具有重要控制作用.作为深熔作用的"见证者",纳米花岗岩包裹体是寄主岩石部分熔融作用的产物,能够为确定陆壳岩石中天然熔体特征及分析熔融机制提供关键信息.在喜马拉雅东构造结南迦巴瓦岩群的代表性岩石单元(泥质片麻岩与长英质片麻岩)中,石榴石与锆石中常包含有典型的纳米花岗岩包裹体,其代表性子矿物组合为钾长石+斜长石+石英±黑云母,这是在黑云母脱水熔融过程中、寄主片麻岩中熔体被主要转熔矿物(如石榴石等)捕获所形成一类特殊包裹体.在观测基础上,采用高温高压与高温常压手段,对纳米花岗岩包裹体进行均一化实验并获得均一化玻璃质熔体.成分分析表明,均一化熔体成分以过铝质花岗岩为主,其主/微量元素特征能够有效反演部分熔融作用的演化过程.因此,纳米花岗岩包裹体的天然观测与实验研究对于确定天然熔体特征与深入剖析碰撞造山带的地壳深熔作用具有重要启示意义.

关键词：地壳深熔纳米花岗岩包裹体变质演化东喜马拉雅构造结岩石学

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