Abstract
Constraining the timing of fault zone formation is fundamentally important in terms of geotectonics to understand structural evolution and brittle fault processes. This paper presents the first authigenic illite K-Ar age data from fault gouge samples collected from the Red River Shear Zone at Lao Cai province, Vietnam. The fault gouge samples were separated into three grain-size fractions (<0.1 µm, 0.1–0.4 µm and 0.4–1.0 µm). The results show that the K-Ar age values decrease from coarser to finer grain fractions (24.1 to 19.2 Ma), suggesting enrichment in finer fraction of more-recently grown authigenic illites. The timing of the fault movement are the lower intercept ages at 0% detrital illite (19.2 ± 0.92 Ma and 19.4 ± 0.49 Ma). In combination with previous geochronological data, this result indicates that the metamorphism of the Day Nui Con Voi (DNCV) metamorphic complex took place before ca. 26.8 Ma. At about 26.8 Ma-25 Ma, the fault strongly acted to cause the rapid exhumation of the rocks along the Red River-Ailoa Shan Fault Zone (RR-ASFZ). During brittle deformation, the DNCV slowly uplifted, implying weak movement of the fault. This brittle deformation might have lasted for ca. 5 Ma.
| Original language | English |
|---|---|
| Pages (from-to) | 1653-1663 |
| Number of pages | 11 |
| Journal | Acta Geologica Sinica |
| Volume | 90 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2016 Oct 1 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Geology
Cite this
}
K-Ar Dating of Fault Gouges from the Red River Fault Zone of Vietnam. / Bui, Hoang Bac; Ngo, Xuan Thanh; Song, Yungoo; Itaya, Tetsumaru; Yagi, Koshi; Khuong, The Hung; Nguyen, Tien Dung.
In: Acta Geologica Sinica, Vol. 90, No. 5, 01.10.2016, p. 1653-1663.Research output: Contribution to journal › Article
TY - JOUR
T1 - K-Ar Dating of Fault Gouges from the Red River Fault Zone of Vietnam
AU - Bui, Hoang Bac
AU - Ngo, Xuan Thanh
AU - Song, Yungoo
AU - Itaya, Tetsumaru
AU - Yagi, Koshi
AU - Khuong, The Hung
AU - Nguyen, Tien Dung
PY - 2016/10/1
Y1 - 2016/10/1
N2 - Constraining the timing of fault zone formation is fundamentally important in terms of geotectonics to understand structural evolution and brittle fault processes. This paper presents the first authigenic illite K-Ar age data from fault gouge samples collected from the Red River Shear Zone at Lao Cai province, Vietnam. The fault gouge samples were separated into three grain-size fractions (<0.1 µm, 0.1–0.4 µm and 0.4–1.0 µm). The results show that the K-Ar age values decrease from coarser to finer grain fractions (24.1 to 19.2 Ma), suggesting enrichment in finer fraction of more-recently grown authigenic illites. The timing of the fault movement are the lower intercept ages at 0% detrital illite (19.2 ± 0.92 Ma and 19.4 ± 0.49 Ma). In combination with previous geochronological data, this result indicates that the metamorphism of the Day Nui Con Voi (DNCV) metamorphic complex took place before ca. 26.8 Ma. At about 26.8 Ma-25 Ma, the fault strongly acted to cause the rapid exhumation of the rocks along the Red River-Ailoa Shan Fault Zone (RR-ASFZ). During brittle deformation, the DNCV slowly uplifted, implying weak movement of the fault. This brittle deformation might have lasted for ca. 5 Ma.
AB - Constraining the timing of fault zone formation is fundamentally important in terms of geotectonics to understand structural evolution and brittle fault processes. This paper presents the first authigenic illite K-Ar age data from fault gouge samples collected from the Red River Shear Zone at Lao Cai province, Vietnam. The fault gouge samples were separated into three grain-size fractions (<0.1 µm, 0.1–0.4 µm and 0.4–1.0 µm). The results show that the K-Ar age values decrease from coarser to finer grain fractions (24.1 to 19.2 Ma), suggesting enrichment in finer fraction of more-recently grown authigenic illites. The timing of the fault movement are the lower intercept ages at 0% detrital illite (19.2 ± 0.92 Ma and 19.4 ± 0.49 Ma). In combination with previous geochronological data, this result indicates that the metamorphism of the Day Nui Con Voi (DNCV) metamorphic complex took place before ca. 26.8 Ma. At about 26.8 Ma-25 Ma, the fault strongly acted to cause the rapid exhumation of the rocks along the Red River-Ailoa Shan Fault Zone (RR-ASFZ). During brittle deformation, the DNCV slowly uplifted, implying weak movement of the fault. This brittle deformation might have lasted for ca. 5 Ma.
UR - http://www.scopus.com/inward/record.url?scp=84995566979&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84995566979&partnerID=8YFLogxK
U2 - 10.1111/1755-6724.12808
DO - 10.1111/1755-6724.12808
M3 - Article
AN - SCOPUS:84995566979
VL - 90
SP - 1653
EP - 1663
JO - Acta Geologica Sinica (English Edition)
JF - Acta Geologica Sinica (English Edition)
SN - 0001-5717
IS - 5
ER -