Asset Details
Do you wish to reserve the book?
Degassing of deep-sourced CO2 from Xianshuihe-Anninghe fault zones in the eastern Tibetan Plateau
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Degassing of deep-sourced CO2 from Xianshuihe-Anninghe fault zones in the eastern Tibetan Plateau
Do you wish to request the book?
Degassing of deep-sourced CO2 from Xianshuihe-Anninghe fault zones in the eastern Tibetan Plateau
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
Degassing of deep-sourced CO2 from Xianshuihe-Anninghe fault zones in the eastern Tibetan Plateau
2022
Overview
A large number of gases are releasing from the medium-high temperature geothermal fields distributed along the large-scale strike-slip fault zones in the southeastern margin of the Tibetan Plateau. In this study, 11 hot spring water and the associated bubbling gas samples were collected along the Xianshuihe-Anninghe fault zones (XSH-ANHFZ) and analyzed for chemical and isotopic compositions. The
δ
18
O
H
2
O
and
δ
D
H
2
O
values indicate that hot spring waters are predominantly meteoric origin recharged from different altitudes. Most water samples are significantly enriched in Na
+
and HCO
3
−
due to the dissolution of regional evaporites, carbonates and Na-silicates.
3
He/
4
He ratios of the gas samples are 0.025–2.73 times the atmospheric value. The
3
He/
4
He ratios are high in the Kangding region where the dense faults are distributed, and gradually decrease with increasing distance from Kangding towards both sides along the Xianshuihe fault zones (XSHFZ). Hydrothermal fluids have dissolved inorganic carbon (DIC) concentrations from 2 to 42 mmol L
−1
,
δ
13
C
DIC
from −6.9‰ to 1.3‰,
δ
13
C
CO
2
from −7.2‰ to −3.6‰ and Δ
14
C from −997‰ to −909‰. Combining regional geochemical and geological information, the CO
2
sources can be attributed to deep-sourced CO
2
from mantle and metamorphism of marine carbonate, and shallow-sourced CO
2
from the dissolution of marine carbonate and biogenic CO
2
. The mass balance model shows that 11±6% of the DIC is sourced from the dissolution of shallow carbonate minerals, 9±8% formed by pyrolysis of sedimentary organic matter, 80±9% derived from deep metamorphic origin and mantle-derived CO
2
. Among them, the deep-sourced CO
2
in Anninghe fault zones (ANHFZ) is merely metamorphic carbon, whereas ca. 12% and ca. 88% of the deep-sourced CO
2
in the XSHFZ are derived from the mantle and metamorphic carbon, respectively. The average deep-sourced CO
2
flux in the Kangding geothermal field is estimated to be 160 t a
−1
. If all the hot springs in various fault zones in the southeastern margin of the Tibetan Plateau are taken into account, the regional deep-sourced CO
2
flux would reach ca. 10
5
t a
−1
. These results show that the deep-sourced CO
2
released from non-volcanic areas might account for a considerable proportion of the total amount of global deep-sourced carbon degassing, which should be paid more attention to.
