Late Cretaceous and Cenozoic tectonics of the Malay Peninsula constrained by thermochronology |
| |
| Institution: | 1. SE Asia Research Group, Department of Earth Sciences, Royal Holloway University of London, Egham TW20 0EX, UK;2. Minerals and Geoscience Department Malaysia (JMG) Sarawak, Jalan Wan Abdul Rahman, Kenyalang Park, P.O. Box 560, 93712 Kuching, Sarawak, Malaysia;3. Getech Group plc, Leeds LS8 2LJ, UK;1. Vietnam Petroleum Institute, 167 Trung Kinh, Cau Giay, Hanoi, Viet Nam;2. Indiana University, United States;3. PTTEP, Enco Building A, 555, Vibhavadi-Rangsit Road, Chatuchak, Bangkok, 10900, Thailand;4. South Vietnam Geological Mapping Division, 200 Ly Chinh Thang, Ward 9, District 3, Ho Chi Minh City, Viet Nam;5. Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark |
| |
| Abstract: | New thermochronological analyses of granites from the Malay Peninsula record the region’s thermal history during the Late Mesozoic and Cenozoic. 40Ar/39Ar and (U–Th–Sm)/He analyses are combined with existing fission track data to provide a comprehensive set of temperature and time data. Fully and partially reset K-feldspar and biotite mica 40Ar/39Ar analyses indicate a significant period of thermal perturbation between ～100 and ～90 Ma, and a second lesser perturbation between ～51 and ～43 Ma. Zircon (U–Th–Sm)/He analyses and existing fission track data indicate exhumation of the Malay Peninsula in the Cretaceous, and renewed, localised exhumation in the early Paleogene. Apatite (U–Th–Sm)/He and fission track data indicate rapid exhumation of the region in the Late Eocene and Oligocene. Late Cretaceous tectonism is linked to the reversal of a regional dynamic topographic low following the cessation of subduction along the Sundaland margin in the Late Cretaceous, causing regional uplift and exhumation and the addition of significant heat into the crust via mantle upwelling. Early Paleogene exhumation may reflect the continuation of Cretaceous tectonism or a discrete phase of Paleocene exhumation linked to localised transpressional tectonics. Eocene tectonism is coincident with major subsidence offshore of the Malay Peninsula, interpreted to reflect regional block faulting in response to north–south compression driven by the resumption of subduction along the southern margin of Sundaland in the Eocene. |
| |
| Keywords: | Thermochronology Malay Peninsula Tectonics SE Asia |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
