TY - JOUR
T1 - New Paleomagnetic results from Late Triassic limestone of the Eastern Qiangtang Terrane
T2 - Implications for the closure of the Paleo-Jinshajiang Ocean
AU - Yu, Liang
AU - Yan, Maodu
AU - Domeier, Mathew
AU - Li, Bingshuai
AU - Shen, Miaomiao
AU - Guan, Chong
AU - Fu, Qiang
AU - Xu, Wanlong
AU - Xu, Zunbo
AU - Niu, Zhichao
AU - Zhang, Dawen
AU - Yang, Liye
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2025/1/1
Y1 - 2025/1/1
N2 - To constrain the drift history of the Eastern Qiangtang Terrane and the closure time of the Paleo-Jinshajiang Ocean, we conducted a paleomagnetic study of Late Triassic limestones in the Qamdo region of the Eastern Qiangtang Terrane. The results of the rock magnetic, petrographic, and reversal test indicate the limestones carry primary magnetizations. Our new paleomagnetic data provide a Late Triassic paleopole of 30.9°N, 161.4°E (A95 = 8.4°), which corresponds to a paleolatitude of 35 ± 8.4°N for the study area. Integrating these data with existing paleomagnetic results and geological evidence, we determine that the Eastern Qiangtang Terrane was situated at a relatively constant paleolatitudinal position without significant N-S displacements during ∼230–209 Ma. We conclude that the Paleo-Jinshajiang Ocean in the Qamdo region had already closed before ∼221 Ma, and likely around ∼230 Ma.
AB - To constrain the drift history of the Eastern Qiangtang Terrane and the closure time of the Paleo-Jinshajiang Ocean, we conducted a paleomagnetic study of Late Triassic limestones in the Qamdo region of the Eastern Qiangtang Terrane. The results of the rock magnetic, petrographic, and reversal test indicate the limestones carry primary magnetizations. Our new paleomagnetic data provide a Late Triassic paleopole of 30.9°N, 161.4°E (A95 = 8.4°), which corresponds to a paleolatitude of 35 ± 8.4°N for the study area. Integrating these data with existing paleomagnetic results and geological evidence, we determine that the Eastern Qiangtang Terrane was situated at a relatively constant paleolatitudinal position without significant N-S displacements during ∼230–209 Ma. We conclude that the Paleo-Jinshajiang Ocean in the Qamdo region had already closed before ∼221 Ma, and likely around ∼230 Ma.
KW - Eastern Qiangtang Terrane
KW - Late Triassic limestone
KW - Paleo-Jinshajiang Ocean
KW - Paleogeographic reconstruction
UR - http://www.scopus.com/inward/record.url?scp=85209643641&partnerID=8YFLogxK
U2 - 10.1016/j.palaeo.2024.112610
DO - 10.1016/j.palaeo.2024.112610
M3 - Article
AN - SCOPUS:85209643641
SN - 0031-0182
VL - 657
JO - Palaeogeography, Palaeoclimatology, Palaeoecology
JF - Palaeogeography, Palaeoclimatology, Palaeoecology
M1 - 112610
ER -