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Discovery of unusual metamorphic temperatures in the Yuli Belt, eastern Taiwan; new interpretation of data by Raman carbonaceous material geothermometry

Yui Kouketsu, Chin-Ho Tsai and Masaki Enami
Discovery of unusual metamorphic temperatures in the Yuli Belt, eastern Taiwan; new interpretation of data by Raman carbonaceous material geothermometry
Geology (Boulder) (April 2019) Pre-Issue Publication

Abstract

The crystallinity of carbonaceous material (CM) in metasedimentary schists in the Yuli belt, eastern Taiwan, shows unusual diversity. The difference between the maximum and minimum temperatures estimated by a Raman CM geothermometer reaches 200 degrees C, which is much wider than those in other metamorphic belts and contact aureoles. In light of these results, we considered two possible explanations: (1) a mixture of detrital and metamorphic graphite grains, and (2) a mixture of different reactive CM during short-lived metamorphism. One sample shows a near-bimodal peak, suggesting the former hypothesis, while the other two samples show a continuous single peak, suggesting the latter possibility. Detailed analyses of CM crystallinities have the potential to extract information relating not only to the peak metamorphic temperature, but also to the pre-metamorphic history or the duration of heating in a metamorphic belt.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: Pre-Issue Publication
Title: Discovery of unusual metamorphic temperatures in the Yuli Belt, eastern Taiwan; new interpretation of data by Raman carbonaceous material geothermometry
Affiliation: Nagoya University, Graduate School of Environmental Studies, Nagoya, Japan
Published: 20190415
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 35
Accession Number: 2019-038007
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019196
Illustration Description: illus. incl. geol. sketch map
N22°00'00" - N25°30'00", E119°15'00" - E122°00'00"
Secondary Affiliation: National Dong Hwa University, TWN, Taiwan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 2019
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