Thermochronological constrain of the Nicobar Fan

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Author(s): de Oliveira, Christie Helouise Engelmann; Chemale, Farid, Jr.; Girelli, Tiago J.
Author Affiliation(s): Primary:
Universidade do Vale do Rio dos Sinos, Programa de Pos-Graduacao em Geologia, Sao Leopoldo, Brazil
Volume Title: European Geosciences Union general assembly 2019
Source: Geophysical Research Abstracts, Vol.21; European Geosciences Union general assembly 2019, Vienna, Austria, April 7-12, 2019. Publisher: Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau, Germany. ISSN: 1029-7006
Note: In English
Summary: The Bengal-Nicobar Fan is the largest submarine fan in the Earth. To constrain the thermochronological history of the Nicobar Fan, sediments from IODP Expedition 362 Site U1480 and Site U1481 were analyzed by apatite fission track thermochronology. The apatites are partially annealed, and the central ages does not provide precise information on exhumation and thermotectonic events that occurred in the source terrain. All samples failed the 2-test, indicating that more than one age component is present in the obtained single grain age distribution. The best-fit solution for the combined single grain apatite fission track ages results in four age components at ca. 5, 16, 42 and 126 Ma, that record the major climatic events of the Himalayan Mountains. Subunit IIA shows a maximum depositional age of 2.44 0.4 Ma and Subunit IIC shows a maximum depositional age of 10.8 3.8 Ma. The thermal models indicate that the samples experienced paleotemperatures above 90 C in response to burial, which is supported by petrography observations of McNeill et al. (2017) that described a quartz cementation at high temperatures (>80°C) in the Unit II. [Copyright Author(s) 2019. CC Attribution 4.0 License:]
Year of Publication: 2019
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 03 Geochronology; 12 Stratigraphy, Historical Geology and Paleoecology; Apatite; Bay of Bengal; Bengal Fan; Cenozoic; Chronostratigraphy; Cores; Cretaceous; Expedition 362; Fission-track dating; Geochronology; IODP Site U1480; IODP Site U1481; Indian Ocean; International Ocean Discovery Program; Lithofacies; Mesozoic; Paleotemperature; Phosphates; Relative age; Submarine fans; Tertiary; Thermochronology
Coordinates: N030203 N030203 E0913621 E0913621
N024516 N024516 E0914535 E0914535
Record ID: 2019050519
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from European Geosciences Union, Munich, Germany