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Evidence for strain induced graphitization across a ductile fault zone

Metadata Updated: October 29, 2023

A suite of slate samples collected along a 2 km transect crossing the Lishan Fault in central Taiwan were evaluated to assess the role of ductile strain energy in natural graphitization at greenschist facies metamorphic conditions. Scanning electron microscope (SEM) imaging documents phyllosilicate and quartz replacement textures consistent cleavage development via dissolution-precipitation processes that increase in intensity from east to west. X-ray diffraction data reveal an east-to-west linear decrease in the full-width-at-half-maximum (FWHM) values of the 004 muscovite peaks and shifts towards higher 2θ (lower d) values. Rietveld refinements required two distinct muscovite populations and muscovite microstrain to account for the muscovite peak variability. Except for the westernmost sample, isothermal conditions were verified with calcite-dolomite geothermometry results. Finally, Raman spectroscopic results including D1-FWHM, G-FWHM, Raman band separation (RBS), and a lesser-known vibrational mode B2g-FWHM, showed robust linear trends across the sampling transect. However, the G-FWHM parameter showed a trend opposite of that expected from thermally driven graphitization.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023
Publisher U.S. Geological Survey
Maintainer
@Id http://datainventory.doi.gov/id/dataset/a0e7ed2540fa9ca2ef4c6c6b4c80d5ee
Identifier USGS:63dd09bad34e9fa19a9a8c48
Data Last Modified 20230419
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://datainventory.doi.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 479a6460-2db7-4d31-b813-25ce9242c7b0
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial 120.7947,21.7799,121.9482,25.2646
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash fa8a874a1e740936ad22feff65305092b735a7fd7ece7a5ee27b3ed467391284
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": 120.7947, 21.7799, 120.7947, 25.2646, 121.9482, 25.2646, 121.9482, 21.7799, 120.7947, 21.7799}

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