Petrology of Tourmaline-Bearing Blueschist from SW Tianshan, China, and Its Implication in B-Rich Fluid Migration in Subduction Zone
文献类型：期刊论文
| 作者 | Shen, Tingting3; Hu, Han2; Zhang, Lifei2,3; Xu, Jie Dudo1; Tian, Zuolin3; Bader, Thomas2,7; Ma, Jinlong6 ; Zhang, Jianxin3; Peng, Weigang5; Yang, Jingsui3,4
|
| 刊名 | JOURNAL OF PETROLOGY
 |
| 出版日期 | 2024-11-04 |
| 卷号 | 65期号:11页码:23 |
| 关键词 | Boron isotopes tourmaline serpentinites subduction zone fluid China |
| ISSN号 | 0022-3530 |
| DOI | 10.1093/petrology/egae116 |
| 英文摘要 | Boron geochemistry can track fluid-rock interaction during subduction zone metamorphism. Rare tourmaline-bearing blueschists, which are associated with ultrahigh-pressure (UHP) serpentinites are first recognized in SW Tianshan, China. Detailed petrology, whole-rock and mineral chemistry, B isotope analysis, and modeling characterized two consecutive stages of tourmaline crystallization (Tur-I, Tur-II). Tourmaline included in, or intergrown with, garnet and the cores of tourmaline in rock matrixes and veins are Tur-I, which grew during prograde metamorphism at 430 degrees C to 460 degrees C/470 degrees C, similar to 1.9-2.1 GPa. The rims of tourmaline in rock matrixes and veins are Tur-II, which formed during initial exhumation at 460 degrees C to 490 degrees C, similar to 2.1-1.7 GPa. Variable delta B-11 values of tourmaline (+8 parts per thousand, Tur-I to -2 parts per thousand, Tur-II) point to a B-11-rich signature of the fluid infiltrating at Stage I. With progressing metamorphism, delta B-11 decreased in the fluid. The high-delta B-11 Tur-I (up to +8 parts per thousand) could not have crystallized from fluid released from the high-pressure metapelites (-12 parts per thousand to -7 parts per thousand) and metabasites (-15 parts per thousand to -5 parts per thousand) surrounding the tourmaline host rocks given the lower delta B-11 values. Modeling of B isotope fractionation yields the delta B-11 values of -9 parts per thousand to -5 parts per thousand, -11 parts per thousand to -1 parts per thousand, and +8 parts per thousand to +17 parts per thousand for the fluids equilibrium with the restitic metapelites, metabasites, and serpentinites, respectively. The tourmaline and whole-rock B isotope data, along with the tourmaline compositions, point to the associated serpentinites as source of the fluid that infiltrated the metamorphic rocks. This fluid was released by the partial dehydration of serpentinites through the reaction antigorite + brucite = olivine + water at forearc depth. We propose that metabasites in subduction zones can acquire B-11-rich signatures through interaction with serpentinite-derived fluids, leading to the formation of robust tourmaline minerals at shallow levels. As a new reservoir of heavy boron, these metabasites can then transport this signature to greater depths. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001354748600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/82112]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Zhang, Lifei |
| 作者单位 | 1.Goethe Univ Frankfurt, Inst Geowissensch, Altenhoferallee 1, D-60438 Frankfurt, Germany 2.Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Yiheyuanlu Rd 5, Beijing 100871, Peoples R China 3.Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Baiwanzhuang Rd 26, Beijing 100037, Peoples R China 4.Nanjing Univ, Sch Earth Sci & Engn, Xianlin Ave 163, Nanjing 210023, Peoples R China 5.Hohai Univ, Coll Oceanog, Focheng West Rd 8, Nanjing 210098, Peoples R China 6.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Ctr Excellence Deep Earth Sci, State Key Lab Isotope Geochem, Kehua St 511, Guangzhou 510640, Peoples R China 7.Chinese Acad Geol Sci, Inst Geomech, Key Lab Paleomagnetism & Paleo Tecton Reconstruct, Minist Nat Resources, South Minzu Univ Rd 11, Beijing 100081, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shen, Tingting,Hu, Han,Zhang, Lifei,et al. Petrology of Tourmaline-Bearing Blueschist from SW Tianshan, China, and Its Implication in B-Rich Fluid Migration in Subduction Zone[J]. JOURNAL OF PETROLOGY,2024,65(11):23. |
| APA | Shen, Tingting.,Hu, Han.,Zhang, Lifei.,Xu, Jie Dudo.,Tian, Zuolin.,...&Yang, Jingsui.(2024).Petrology of Tourmaline-Bearing Blueschist from SW Tianshan, China, and Its Implication in B-Rich Fluid Migration in Subduction Zone.JOURNAL OF PETROLOGY,65(11),23. |
| MLA | Shen, Tingting,et al."Petrology of Tourmaline-Bearing Blueschist from SW Tianshan, China, and Its Implication in B-Rich Fluid Migration in Subduction Zone".JOURNAL OF PETROLOGY 65.11(2024):23. |
入库方式： OAI收割
来源：广州地球化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。