Yongfeng Wang

China University of Geosciences

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Junfeng Zhang

China University of Geosciences

Dapeng Wen

China University of Geosciences

Haijin Xu

China University of Geosciences (Beijing)

Keqing Zong

China University of Geosciences

Zhenmin Jin

China University of Geosciences

Yang Gao

Anhui University

Wenlong Liu

Beihang University

Zhaochu Hu

China University of Geosciences

D. L. Kohlstedt

University of Minnesota

Zaicong Wang

China University of Geosciences

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China University of Geosciences

Chinese Academy of Sciences

China University of Geosciences (Beijing)

Peking University

Jilin University

Guangzhou Institute of Geochemistry

State Key Laboratory of Geological Processes and Mineral Resources

China Geological Survey

China National Petroleum Corporation (China)

University of Chinese Academy of Sciences

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Experimental investigation of antigorite dehydration fabrics at high pressure and high temperature

Junfeng Zhang Wenlong Liu Yongfeng Wang

<p>Antigorite dehydration is well known as a key process in convergent boundaries for the genesis of mantle wedge partial melting and intermediate-depth earthquakes. However, the crystallographic preferred orientations (CPOs) of prograde minerals from antigorite dehydration and its effects on seismic anisotropy of subducting slabs remain ambiguous and controversial. Here we report hydrostatic dehydration experiments on foliated serpentinized peridotite at pressures of 0.3-6 GPa and temperatures of 700-900 &#176;C. Our results show that the orientations of prograde olivine inherit orientations from adjacent olivine grains in the olivine-rich layer by epitaxial growth. In contrast, olivine CPOs evolved with the grain size from fiber-[001] featuring clear [100] point maxima and [001] girdles for fine-grained olivine to orthorhombic patterns characterized by clear [100] and [001] point maxima for coarse-grained olivine, i.e., type-C CPO. We propose that the fine-grained fiber-[001] CPO is developed by topotactic growth at the onset of dehydration, while the orthorhombic type-C CPO for the coarse-grained olivine, especially the [001] point maximum along the lineation, is mainly developed by anisotropic growth resulting from anisotropic fluid flow during the dehydration. The developed olivine type-C CPO in the antigorite-rich layer after antigorite dehydration could explain the trench or strike parallel seismic anisotropy observed at convergent plate boundaries.</p>

Orthorhombic crystal system

Peridotite

Pyrophyllite

Seismic anisotropy

10.5194/egusphere-egu2020-2015

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Continental subduction-induced carbonate metasomatism of the lithospheric mantle: Evidence from the Cenozoic mantle xenoliths in the Qixia basalts, North China Craton

Figshare (2023)

Yang Gao Keqing Zong Junfeng Zhang Luye Zhang Zaicong Wang

Table S1-4S lists the major (wt%) and trace (µg/g) element compositions in minerals (including olivine, clinopyroxene, orthopyroxene, and spinel) from Qixia mantle xenoliths in this study. The major and trace elements of minerals were analyzed in situ by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) with a spot size of 44 μm at the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan (GPMR-CUG). Detailed operating conditions for LA-ICP-MS are described in Liu et al. (2008b). Off-line selection and integration of background and analytical signals along with time-drift correction and quantitative calibration were conducted using the ICPMSDataCal software (Liu et al., 2008b, 2010).

Metasomatism

Xenolith

10.6084/m9.figshare.23512143.v1

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Enhancing Research on Helicobacter pylori Eradication and Esophageal Adenocarcinoma Risk: A Call for Broader Studies and Methodological Rigor

Gastroenterology (2024)

Xiaolong Guo Yongfeng Wang

Esophageal adenocarcinoma

10.1053/j.gastro.2024.08.042

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Experimental Investigation on the Deformation and Dehydration Faulting of Antigorite in Subduction Zones

Acta Geologica Sinica - English Edition (2019)

Junfeng Zhang Yongfeng Wang Wenlong Liu D. L. Kohlstedt

10.1111/1755-6724.13978

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Hydrostatic dehydration fabrics of antigorite at high pressure and high temperature: implications for trench parallel seismic anisotropy at convergent plate boundaries

Figshare (2021)

Wenlong Liu Hongwei Qi Junfeng Zhang Xiang Wu Lijian Feng

The fabric and grain parameter for all samples data is the original data for the figure 6. The R941.ctf is the original ebsd data for figure 4 and figure 5. The R941.ctf and PA328-XZ.ctf are the original data for calculating seismic anisotropy in figure 7.

Hydrostatic pressure

Hydrostatic equilibrium

10.6084/m9.figshare.13547123

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Pyroxene does not always preserve its source hydrogen concentration: Clues from some peridotite xenoliths

Geochimica et Cosmochimica Acta (2020)

Yongfeng Wang Jun-Ying Qin V. Soustelle Junfeng Zhang Haijin Xu

Peridotite

Pyroxene

10.1016/j.gca.2020.10.003

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Influence of Melt-Peridotite Interactions on Deformation and Seismic Properties of the Upper Mantle Beneath a Destroyed Craton: A Case Study of the Damaping Peridotites from the North China Craton

Figshare (2023)

Yongfeng Wang Junfeng Zhang Dapeng Wen

This dataset contains all the original data from EBSD measurements and two tables that contain data used for plotting Fig. 8 and Fig. 9 in the manuscript. It also includes several high-resolution photographs showing examples of our samples that are variably foliated. These photographs were also comined in the Fig.1.docx file. A pdf version of the combined photographs was also supplied.

Peridotite

10.6084/m9.figshare.21706598

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An FTIR Study of Kyanite in the Maobei Kyanite-Bearing Eclogites from the Sulu Orogenic Belt, Eastern China

Journal of Earth Science (2017)

Yi-Ning Wu Yongfeng Wang

Omphacite

10.1007/s12583-017-0774-0

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Type‐B Crystallographic Preferred Orientation in Olivine Induced by Dynamic Dehydration of Antigorite in Forearc Regions

Journal of Geophysical Research Solid Earth (2024)

Wenlong Liu Yi Cao Jianfeng Li M. Song Haijun Xu

Abstract The crystallographic preferred orientation (CPO) of olivine, specifically the type‐B characterized by c‐axes aligned parallel to lineation and b ‐axes concentrated perpendicular to foliation, is essential for explaining the trench‐parallel seismic anisotropy in the forearc regions of subduction zones. However, its origin remains a subject of ambiguity and controversy. In this study, we present experimental findings on the formation of a type‐B olivine CPO through the dehydration of foliated serpentinite under a compressive stress at a pressure of 300 MPa and temperature of 700–750°C. Our results reveal a progressive evolution of olivine CPO, transitioning from a type‐C fabric to a type‐B fabric, with increasing grain size and dehydration level. The type‐B CPO observed in coarse‐grained olivine within fully dehydrated samples primarily arises from mechanisms involving anisotropic growth, grain rotation, and oriented coalescence of newly formed, small olivine grains following the decomposition of antigorite under a compressive stress. This study provides the first experimental evidence for a novel, low‐temperature dynamic dehydration mechanism, in contrast to the mechanism of high‐temperature plastic flow, for explaining the development of type‐B olivine CPO in forearc regions. Hence, it contributes significantly to our understanding of the formation of olivine CPO with implications for seismic anisotropy in subduction zone forearcs.

Forearc

10.1029/2023jb027929

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Olivine water contents in the Paleozoic Mengyin kimberlites: implications for the destruction of the North China craton

Figshare (2023)

Yang Gao Yongfeng Wang Dapeng Wen Haijin Xu Junfeng Zhang

This dataset contains the calculated water contents for all the measured olivine xenocrysts from the studied Mengyin kimberlites (the xlsx file) and all the raw FTIR data collected on the olivine xenocrysts (the zip file).

10.6084/m9.figshare.22153691.v1

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