|
|||||
|
|
Basaltic dykes of the Eastern Belt of Peninsular Malaysia: The effects of the difference in crustal thickness of Sibumasu and Indochina |
|
| Institution: | 1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;2. Department of Geophysics, Hanoi University of Mining and Geology, Hanoi 100000, Vietnam;3. School of Oceanography, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China;4. Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO 65409, USA;1. Department of Petroleum Engineering, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia;2. Department of Energy Resources, University of Stavanger, Norway |
| Abstract: | Basaltic dykes of Peninsular Malaysia are confined to the Eastern Belt (Indochina/East Malaya block) as compared with the Western Belt (Sibumasu Block). The dyke intruded through a crustal fracture formed by stress developed from the evolution of two offshore basins (Malay and Penyu basins) east of Peninsular Malaysia. The Ar–Ar dating from the present study combined with the previous geochronological data indicate that the ages of dykes range from 79 ± 2 Ma to 179 ± 2 Ma. Thus it is difficult to correlate the dykes with the closure of Tethys during Permo-Triassic time because of the younger age of the dykes. The majority of the dykes exposed in the Eastern Belt may have been attributed to the difference of crustal thickness between the Eastern and Western belt of Peninsular Malaysia. A thicker Western Belt crust (13 km more than both Eastern and Central belts) is difficult to rupture with normal plate tectonic stress and therefore serves to contain the rise of a mantle derived melt. The chemistry indicates the basalts are olivine to quartz normative and are of the continental within-plate category. |
| Keywords: | Basaltic dyke Indochina Sibumasu Peninsular Malaysia Ar–Ar dating |
| 本文献已被 ScienceDirect 等数据库收录！ | |