Resolved measurements of 13CDH3 and 12CD2H2 from a mud volcano in Taiwan. (November 2018)

• Record Type: Journal Article
• Authors: Rumble, D.; Ash, J.L.; Wang, Pei-Ling; Lin, Li-Hung; Lin, Yueh-Ting; Tu, Tzu-Hsuan
• Is Part Of: Journal of Asian earth sciences. Volume 167(2018)
• Page Start: 218
• Page End: 221
• Publication Date: 2018-11
• Subjects: Taiwan -- Mud volcano -- Methane -- Carbon and hydrogen isotopes -- Clumped isotopes; Earth sciences -- Asia -- Periodicals; Sciences de la terre -- Asie -- Périodiques; Earth sciences; Asia; Periodicals; 555.05
• DOI: 10.1016/j.jseaes.2018.03.007
• Languages: English
• ISSNs: 1367-9120

Abstract

Highlights: 13 CDH3 and 12 CD2 H2 were measured independently on a Panorama mass spectrometer. 13 CDH3 and 12 CD2 H2 geothermometers give CH4 formation temperature of 150 °C. Thermogenic CH4 is not in thermal equilibrium with hosting liquid mud. Abstract: Resolved measurements of the relative abundances of 13 CDH3 and 12 CD2 H2 from a Taiwan mud volcano confirm that thermogenic CH4 with a formation temperature of 150 °C is bubbling from a pool of liquid mud. Analysis for both doubly-substituted molecules provides confirmation that isotopic exchange equilibrium was achieved between methane isotopologues. Methane extracted from the headspace of core samples taken from sediments deposited proximal to the bubbling pool of mud shows small departures from isotopic equilibrium.