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Multistage Metamorphic Evolution and P-T-t Path of High-T Eclogite from the North Dabie Complex Zone during Continental Subduction and Exhumation

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 759-760页

作者： LIU Yican DENG Liangpeng GU Xiaofeng groppo chiara ROLFO Franco CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Department of Earth Sciences University of Torino C.N.R.-I.G.G. Section of Torino

Objective High-T eclogites from the North Dabie complex zone （NDZ）, central China underwent a complex metamorphic evolution involved in ultrahigh-pressure （UHP） and high- pressure eclogite-facies metamorphism, and subsequent granulite-facies overprinting and amphibolite-facies retrogression during the Mesozoic continental deep subduction and exhumation. As a consequence, the eclogites were strongly affected by multiple decompression and re-crystallization processes during exhumation. Some eclogites have even been wholly transformed to garnet granulite, or garnet amphibolite, or even garnet-absent amphibolite.

关键词： ECLOGITE SUBDUCTION (Geology) ULTRAHIGH pressure metamorphism FACIES (Geology) GEOLOGICAL time

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Partial melting of ultrahigh-pressure metamorphic rocks at convergent continental margins: Evidences, melt compositions and physical effects

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Geoscience Frontiers 2018年第4期9卷 1229-1242页

作者： Liang-Peng Deng Yi-Can Liu Xiao-Feng Gu chiara groppo Franco Rolfo CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of China Department of Earth Sciences University of Torino C.N.R.- I.G.G. Section of Torino

Ultrahigh-pressure（UHP） metamorphic rocks are distinctive products of crustal deep subduction,and are mainly exposed in continental subduction-collision terranes. UHP slices of continental crust are usually involved in multistage exhumation and partial melting, which has obvious influence on the rheological features of the rocks, and thus significantly affect the dynamic behavior of subducted slices. Moreover,partial melting of UHP rocks have significant influence on element mobility and related isotope behavior within continental subduction zones, which is in turn crucial to chemical differentiation of the continental crust and to crust-mantle *** melting can occur before, during or after the peak metamorphism of UHP rocks. Post-peak decompression melting has been better constrained by remelting experiments; however, because of multiple stages of decompression, retrogression and deformation, evidence of former melts in UHP rocks is often erased. Field evidence is among the most reliable criteria to infer partial melting. Glass and nanogranitoid inclusions are generally considered conclusive petrographic evidence. The residual assemblages after melt extraction are also significant to indicate partial melting in some cases. Besides field and petrographic evidence, bulk-rock and zircon trace-element geochemical features are also effective tools for recognizing partial melting of UHP rocks. Phase equilibrium modeling is an important petrological tool that is becoming more and more popular in P-T estimation of the evolution of metamorphic rocks; by taking into account the activity model of silicate melt, it can predict when partial melting occurred if the P-T path of a given rock is *** silicate melt is commonly leucogranitic and peraluminous in composition with high SiO_2,low MgO, FeO, MnO, TiO_2 and CaO, and variable K_2 O and Na_2 O contents. Mineralogy of nanogranites found in UHP rocks mainly consists of plagioclase ＋ K-feldspar ＋ quartz, p

关键词： Partial melting Continental subduction-collision Ultrahigh-pressure metamorphism Leucosome Phase equilibrium modeling

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华北板块东南缘五河杂岩的麻粒岩相变质、部分熔融与交代作用

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地球科学与环境学报 2015年第1期37卷 1-11页

作者：刘贻灿王程程张品刚 groppo chiara ROLFO Franco 王安东中国科学院壳幔物质与环境重点实验室安徽合肥230026 中国科学技术大学地球和空间科学学院安徽合肥230026 安徽省煤田地质局勘查研究院安徽合肥230088 都灵大学地球科学系皮埃蒙特都灵10124

华北板块东南缘五河杂岩属于前寒武纪变质基底,出露于蚌埠及相邻地区,主要由变质的镁铁质和长英质火成岩以及表壳岩系组成,并伴生有古元古代片麻状花岗岩和中生代花岗岩类,构成了"蚌埠隆起"。五河杂岩中主要有石榴斜长角闪岩/榴闪岩、... 详细信息

华北板块东南缘五河杂岩属于前寒武纪变质基底,出露于蚌埠及相邻地区,主要由变质的镁铁质和长英质火成岩以及表壳岩系组成,并伴生有古元古代片麻状花岗岩和中生代花岗岩类,构成了"蚌埠隆起"。五河杂岩中主要有石榴斜长角闪岩/榴闪岩、石榴麻粒岩、异剥钙榴岩、石榴斜长角闪片麻岩、花岗片麻岩、云母片岩、大理岩和变质砂岩等岩石类型。这些不同类型的变质岩具有类似的峰期变质矿物,如石榴子石、单斜辉石、斜长石、金红石和石英等;结合其锆石U-Pb年龄,表明它们共同经历了古元古代高压麻粒岩相变质作用。石榴斜长角闪岩的石榴子石包体中存在钾长石+斜长石+石英+黑云母等矿物交生体,指示早期花岗质熔体的存在,证明五河杂岩在古元代变质过程中发生了部分熔融作用。此外,部分变基性岩中存在方解石、绿帘石和绿泥石等蚀变矿物,沿石榴子石的裂隙中分布有钾长石+斜长石+石英+黑云母+角闪石等矿物,表明它们经历了含碳酸盐的熔/流体交代作用以及绿帘石化和绿泥石化作用等。遭受过古元古代含碳酸盐的熔/流体交代作用的变基性岩表现为高放射成因Pb同位素组成,而未遭受含碳酸盐的熔/流体交代作用的变基性岩则表现为典型华北板块前寒武纪麻粒岩地体和下地壳包体岩石的低放射成因Pb同位素组成。

关键词：麻粒岩相多阶段变质作用部分熔融交代作用前寒武纪五河杂岩华北板块

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