|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| Journal of the Geological Society |  |
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
Article |
1 Earth Science Department, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, M5S 2C6 Canada
2 Hong Kong Geological Survey, Geotechnical Engineering Office, Civil Engineering Building, 101 Princess Margaret Road, Kowloon, Hong Kong, China (e-mail: rjsewgeo{at}netvigator.com)
Twenty-two new zircon and monazite U-Pb ages have been obtained for Mesozoic plutonic and volcanic rocks of Hong Kong. These have revealed the existence of four distinct periods of Mid-Jurassic to Lower Cretaceous volcano-plutonism: 164.6 ±0.2 to 159.3 ±0.3 Ma, 146.6 ±0.2 to 146.2 ±0.2 Ma, 143.7 ±0.3 to 142.5 ±0.3 Ma, and 140.9 ±0.2 to 140.4 ±0.2 Ma. A concordant monazite age of 236.3 ± 0.8 Ma has also been obtained from one intrusive body representing the first known occurrence of a Mid-Triassic granitoid in the Territory. Among these rocks, discordant U-Pb data projected to the concordia curve have given a broad range of inheritance ages from early Phanerozoic to late Archaean. A xenocrystic zircon from one sample has yielded a concordant age of 1872 ±3 Ma. The new U-Pb ages have refined the results of recent Rb-Sr whole-rock age dating of the granitoid rocks and have considerably improved correlation between intrusive and extrusive units. The occurrence of inherited components in many of the analysed rocks indicates that they were derived from, or erupted through, older crust containing a wide variety of age components, either as primary igneous or detrital material.
KEYWORDS: Hong Kong, U-Pb, Mesozoic, zircon, dates
This article has been cited by other articles:
|
|
 |
|
  P. D. Clift, A. T.S. Lin, A. Carter, F. Wu, A. E. Draut, T.-H. Lai, L.-Y. Fei, H. Schouten, and L. Teng Post-collisional collapse in the wake of migrating arc-continent collision in the Ilan Basin, Taiwan Geological Society of America Special Papers, January 1, 2008; 436(0): 257 - 278. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. J. N. Fletcher, Lung. S. Chan, R. J. Sewell, S. D. G. Campbell, D. W. Davis, and J. Zhu Basement heterogeneity in the Cathaysia crustal block, southeast China Geological Society, London, Special Publications, January 1, 2004; 226(1): 145 - 155. [Abstract] [PDF]
|
|
|
|
 |
|
 G. Dromart, J.-P. Garcia, F. Gaumet, S. Picard, M. Rousseau, F. Atrops, C. Lecuyer, and S. M. F. Sheppard Perturbation of the carbon cycle at the Middle/Late Jurassic transition: Geological and geochemical evidence Am J Sci, October 1, 2003; 303(8): 667 - 707. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. D. Clift, J. Lin, and Odp Leg 184 Scientific Party Patterns of extension and magmatism along the continent-ocean boundary, South China margin Geological Society, London, Special Publications, January 1, 2001; 187(1): 489 - 510. [Abstract] [PDF]
|
|
|
|
 |
|
 P. A. KIRK, S. D. G. CAMPBELL, C. J. N. FLETCHER, and R. J. MERRIMAN The significance of primary volcanic fabrics and clay distribution in landslides in Hong Kong Journal of the Geological Society, December 1, 1997; 154(6): 1009 - 1019. [Abstract] [PDF]
|
|
|
|
|
|
C. J. N. FLETCHER, S. D. G. CAMPBELL, R. M. CARRUTHERS, J. P. BUSBY, and K. W. LAI Regional tectonic setting of Hong Kong: implications of new gravity models Journal of the Geological Society, December 1, 1997; 154(6): 1021 - 1030. [Abstract] [PDF]
|
|
|
|
|
|
R. J. SEWELL and S. D. G. CAMPBELL Geochemistry of coeval Mesozoic plutonic and volcanic suites in Hong Kong Journal of the Geological Society, December 1, 1997; 154(6): 1053 - 1066. [Abstract] [PDF]
|
|
|
|
|
|
R. SHAW Variations in sub-tropical deep weathering profiles over the Kowloon Granite, Hong Kong Journal of the Geological Society, December 1, 1997; 154(6): 1077 - 1085. [Abstract] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
