Late pleistocene movement of Nam O - Nam Dong fault: evidence from electron spin resonance dating of fault gouge in the Western Da Nang city

Hung  Nguyen Quoc; Hai Tran Thanh; Dao Vu Anh; Thanh Ngo Xuan

doi:10.15625/2615-9783/16198

Author affiliations

Authors

Nguyen Quoc Hung Hanoi University of Mining and Geology, Hanoi, Vietnam
Tran Thanh Hai Hanoi University of Mining and Geology, Hanoi, Vietnam
Vu Anh Dao Hanoi University of Mining and Geology, Hanoi, Vietnam
Ngo Xuan Thanh Hanoi University of Mining and Geology, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/16198

Keywords:

Quartz ESR dating, active fault, central Vietnam, Indochina

Abstract

The Nam O - Nam Dong fault is rated as one of the most seismic source zones in Central Vietnam. Field investigation in the mountainous areas in the Cam Le and Hoa Vang districts (Da Nang city), which is a part of the Nam O - Nam Dong fault zone, the authors have discovered fault gouge zone of 5-40 cm width within the Dai Loc granitic rock. Two fault gouge samples were collected for Electron spin resonance (ESR) dating. The results from the ESR dating on the quartz grains from the fault gouge samples showed the youngest age from the smallest fraction, probably indicating that ESR signals in the fractions were completely zeroed at the time of faulting due to frictional heat. The preliminary results from the ESR dating on the quartz grains from the fault gouge indicate that the last major faulting in this site was later the ages of 15.05±3.55 ka to 18.21±4.06 ka ago. Multiple actives during the late Pleistocene - Holocene of this fault had uplifted the fault gouge from a depth-seated to the present-day locality. These data suggest that this fault zone can be classified as a potentially active fault zone and presents some seismic hazards.

Downloads

Download data is not yet available.

References

Ariyama T., 1985. Conditions of resetting the ESR clock during faulting. In: Ikeya, M., Miki, T. (Eds.), ESR Dating and Dosimetry, Ionics, 251-258.

Fukuchi T., Imai N., 1998. Resetting experiment of E´ centers by natural faulting - the case of the Nojima earthquake fault in Japan. Quaternary Science Reviews, 17(11), 1063-1068.

Grün R., 1992. Remarks on ESR dating of fault movements. Journal of the Geological Society, 149(2), 261-264.

Ikeya M., Miki N., Tanaka K., 1982. Dating of fault by electron spin resonance on intrafault materials, Science, 215, 1392-1393.

Imai N., Shimokawa K., Hirota M., 1985. ESR dating of volcanic ash. Nature, 314(6006), 81-83.

Isoya J., Bowman M.K., Norris J.R., Weil J.A., 1983. An elcetron spin echo envelope modulation study of lithium hyperfine and quadropole coupling in the A(Ti-Li) center of α-quartz. Journal of Chemical Physics, 78(4), 1735-1746.

Ito T., Sawada S., 1985. Reliable criteria for selection of sampling points for ESR fault dating. ESR Dating & Dosimetry, Ionics, Tokyo, 229-237.

Keller E.D., Pinter N., 1996. Active Tectonics: Earthquakes, Uplift, and Landscape. Prentice-Hall, New Jersey.

Lee H.K., Schwarcz H.P., 1994. Criteria for complete zeroing of ESR signals during faulting of the San Gabriel fault zone, S. California; Tectonophysics, 235, 317-337.

Lee H.K., Yang J.S., 2007. ESR dating of the Eupchon fault, South Korea. Quaternary Geochronology, 2, 392-397.

Ngo L.T., Rodkin M.V., Tran V.P, Nguyen Q. Phung, Vu T.H., 2017. Assessment of earthquake hazard for the northwestern Vietnam from geological and geophysical data using an original program package. Journal of Volcanology and Seismology, 11, 164-171.

Ngo T.D., Nguyen M.D., Nguyen D.B., 2008. A review of the Current Vietnamese Earthquake Design Code. EJSE Special Issue, 32-41.

Nguyen H.N., Pham T.T., Nguyen T.N., 2016. Probabilistic seismic hazard assessment for the Tranh River hydropower plant No2 site, Quang Nam province. Vietnam Journal of Earth Sciences, 38(2), 189-203.

Nguyen H.P., 2004. Seismic Hazard Maps of Vietnam and the East Vietnam Sea. Journal of Earth’s Sciences, 26(2), 97-111 (in Vietnamese).

Nguyen Q.H., Ngo X.T., Vu A.D., 2020. U-Pb ages of zircon from I- and S-type granites from northern Kon Tum terrane: Implications for late Paleozoic-Mesozoic magmatism in Central Vietnam. Journal of the Geological Society of Korea, 56(6), 727-735.

Nguyen Q.H., Vu A.D., Ngo X.T., Tran T.H., Dang V.B., 2019. ESR dating of fault gouge in the midstream Thu Bon river: New evidence of fault movements during late Pleistocene-Holocene. Geology Journal, 367pp (in Vietnamese with English abstract).

Nguyen V.T. (edt.), 1995. Geological and Mineral Resources map sheet D-49-I on scale 1:200,000. Geological Survey of Vietnam, Hanoi.

Shimada A., Toyoda S., 2004. The optimal conditions of microwave and temperature of ESR measurement suitable for impurities centers in quartz. Advances in ESR Applications, 21, 13-16.

Stapelbroek M., Griscom D.L., Friebele E.J., Sigel G.H., 1979. Oxygen associated trapped holecenters in high purity fused silicas. J. Non-Cryst. Solids, 32, 313-326.

Tanner D., Brandes C., 2019. Understanding Faults. Chapter 7. Elsevier, 380pp.

Thanh N.X., Hai T.T., Hoang N., Vu Q.L., Kwon S.H., Itaya T., Santosh M., 2014. Backarc mafic-ultramafic magmatism in Northeastern Vietnam and its regional tectonic significance.Journal of Asian Earth Sciences, 90, 45-60.

Thanh N.X., Santosh M., Tran T.H., Pham T.H., 2016. Subduction initiation of Indochina and South China blocks: insight from the forearcophiolitic peridotites of the Song Ma Suture Zone in Vietnam. Geological Journal, 51(3), 421-442.

Toyoda S., 2015. Paramagnetic lattice defects in quartz for applications to ESR dating. Quaternary Geochronology, 30, 498-505.

Toyoda S., Falgueres C., 2003. The method to represent the ESR signal intensity of the aluminum hole center in quartz for the purpose of dating. Adv. ESR Appl., 20, 7-10.

Toyoda S., Hattori M., 2000. Formation and decay of the E1’ center and of its precursor. Applied Radiation Isotopes, 52, 1351-1356.

Toyoda S., Schwarcz H.P., 1997b. The hazard of the Counterfeit E1' signal in quartz to ESR dating of fault movements. Quat. Sci. Rev. (Quat. Geochronol.), 16, 483-486.

Ulusoy Ü., 2004. ESR dating of North Anatolian (Turkey) and Nojima (Japan) faults. Quaternary Science Reviews, 23(1-2), 161-174.

Yin G.M., Lu Y.C., Wei L.Y., Zhang J.Z., 2002. Chronological study of faulting events of Gaoliying fault, Beijing. Seismology and Geology, 24(1), 101-110.

Yokoyama Y., Falgueres C., Quaegebeur J.P., 1985. ESR dating of quartz from quaternary sediments: first attempt. Nucl. Tracks Radiat. Meas., 10, 921-928.