Subduction channel fluid-rock interaction and mass transfer: Constraints from a retrograde vein in blueschist (SW Tianshan, China)
文献类型：期刊论文
| 作者 | Li, Ji-Lei1; John, Timm2; Gao, Jun1,3; Klemd, Reiner4; Wang, Xin-Shui1 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2017-05-05 |
| 卷号 | 456页码:28-42 |
| 关键词 | Element mobility Fluid-rock interaction Retrograde fluid flow Albite vein Blueschist Tianshan |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2017.03.003 |
| 文献子类 | Article |
| 英文摘要 | One widely neglected part of the subduction zone fluid cycle is the retrograde fluid flow along the plate interface. This fluid flow may facilitate the exhumation of slab-derived rocks within the subduction channel. However, our understanding on the nature and behavior of these retrograde fluids is still insufficient. Retrograde veins preserved in HP-UHP rocks can provide valuable information about fluid activities and mass transfer at the plate interface and exhumation processes. In this study, we present a petrological and geochemical investigation of a typical retrograde vein and its blueschist host rock, which occurs throughout the whole Akeyazi (U)HP terrane in the Chinese southwestern Tianshan. The magnetite-bearing albite-calcite vein, representing an external fluid pathway, crosscuts the host blueschist that mainly consists of glaucophane, garnet, epidote and titanite. Along the fluid conduit the immediate wall-rock experienced greenschist-facies overprinting as displayed by an albite-rich selvage that grades into a chlorite-biotite selvage towards the host rock. The replacements of garnet by chlorite and glaucophane by albite are thought to have occurred due to an interface-coupled dissolution precipitation mechanism. Mass balance calculations show that during fluid-rock interaction large amounts of LILE (K-Rb-Ba-Cs and Pb), Cu and CO2 were added to the selvages (mass gain >200%), whereas the altered wall-rock released significant amounts of Ca, Li, Sr, REE and transition metal elements (V-Mn-Co-Ni-Zn) (mass loss mainly between 40 and 100%) due to the dissolution of glaucophane, garnet and epidote. The chlorite-biotite selvage experienced additional SiO2 and Na2O mass losses as well as FeO, MgO and H2O mass gains, whereas the albite-rich selvage underwent exactly the opposite mass transfer with respect to these components. The Al, Ti, Nb, Ta and Cr contents were constant during the alteration. Therefore, the retrograde fluid causing greenschist-facies overprinting of the blueschist host in the subduction channel (at ca. 30 km depth) is proposed to be oxidized and enriched in LILE, Cu and CO2 components, whereas Ca, Li, Sr, REE, Y and transition metal elements (V-Mn-Co-Ni-Zn) are thought to have been mobilized during fluid-rock interaction. In addition, the main fluid sources (sediments, oceanic crust or serpentinites) diversely contribute to retrograde fluids at different depths in the subduction channel. (C) 2017 Elsevier B.V. All rights reserved. |
| WOS关键词 | ECLOGITE-FACIES ROCKS ; PRESSURE SERPENTINITE DEHYDRATION ; TRACE-ELEMENT MOBILIZATION ; COESITE-BEARING ECLOGITE ; P-T EVOLUTION ; NW-CHINA ; WESTERN TIANSHAN ; SOUTH TIANSHAN ; METAMORPHIC EVOLUTION ; REGIONAL METAMORPHISM |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000402211800004 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | National Natural Science Foundation of China(41502053 ; China Postdoctoral Science Foundation(2014T80135) ; 41390445) ; National Natural Science Foundation of China(41502053 ; China Postdoctoral Science Foundation(2014T80135) ; 41390445) ; National Natural Science Foundation of China(41502053 ; China Postdoctoral Science Foundation(2014T80135) ; 41390445) ; National Natural Science Foundation of China(41502053 ; China Postdoctoral Science Foundation(2014T80135) ; 41390445) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/52879]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Li, Ji-Lei; Gao, Jun |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China 2.Free Univ Berlin, Inst Geol Wissensch, Malteserstr 74-100, D-12449 Berlin, Germany 3.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China 4.Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Schlossgarten 5a, D-91054 Erlangen, Germany |
| 推荐引用方式 GB/T 7714 | Li, Ji-Lei,John, Timm,Gao, Jun,et al. Subduction channel fluid-rock interaction and mass transfer: Constraints from a retrograde vein in blueschist (SW Tianshan, China)[J]. CHEMICAL GEOLOGY,2017,456:28-42. |
| APA | Li, Ji-Lei,John, Timm,Gao, Jun,Klemd, Reiner,&Wang, Xin-Shui.(2017).Subduction channel fluid-rock interaction and mass transfer: Constraints from a retrograde vein in blueschist (SW Tianshan, China).CHEMICAL GEOLOGY,456,28-42. |
| MLA | Li, Ji-Lei,et al."Subduction channel fluid-rock interaction and mass transfer: Constraints from a retrograde vein in blueschist (SW Tianshan, China)".CHEMICAL GEOLOGY 456(2017):28-42. |
入库方式： OAI收割
来源：地质与地球物理研究所
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