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Age constraint on Burmese amber based on U-Pb dating of zircons

文献类型：期刊论文

作者Shi, Guanghai1; Grimaldi, David A.2; Harlow, George E.2; Wang, Jing1; Wang, Jun1; Yang, Mengchu1; Lei, Weiyan1; Li, Qiuli3; Li, Xianhua3
刊名CRETACEOUS RESEARCH
出版日期2012-10-01
卷号37页码:155-163
关键词Amber Myanmar Cretaceous Palaeobiota Zircons Pb-206/U-238 ages Volcanic clasts Cenomanian
ISSN号0195-6671
DOI10.1016/j.cretres.2012.03.014
文献子类Article
英文摘要Amber from northern Myanmar has been commercially exploited for millennia, and it also preserves the most diverse palaeobiota among the worlds' seven major deposits of Cretaceous amber. Recent estimated ages vary from Albian to Cenomanian, based on palynology, an arnmonoid, and Mesozoic insect taxa preserved within the amber. The burmite-bearing rock is sedimentary and consists mainly of rounded lithic clasts (0.03 similar to 0.15 mm in diameter), with minor fragments of quartz and feldspar. Among the lithic clasts are mostly volcanic rocks. Zircons separated from the amber matrix form two groups: Group-1 zircons are overgrown and have variable CL patterns, experienced slight geological disturbances after they formed, and their Ion microprobe Pb-206/U-238 ages fall into a very narrow range of similar to 102 Ma- similar to 108 Ma; Group-II zircons are typical magmatic ones with rhythmically flat zones, inferred to be derived from volcanic rock clasts, and yielded a concordia Pb-206/U-238 age of 98.79 +/- 0.62 Ma. The dating on Group-1 zircons is only for their interiors, thus hiding what age excursion might come from the overgrowth. Considering the nearshore marine environment and 1-m thickness of the burmite-bearing sediments, and the syn- and post-eruption deposition of volcanic clasts, the age of 98.79 +/- 0.62 Ma therefore can be used as a maximum limit for the burmite (either at or after), establishing an earliest Cenomanian age for the fossilized inclusions. The age also indicates that volcanic eruption occurred at 98.79 +/- 0.62 Ma in the vicinity of the Hukawng Valley. (C) 2012 Elsevier Ltd. All rights reserved.
WOS关键词CRETACEOUS AMBER ; DEPOSITS ; SPAIN ; HF
WOS研究方向Geology ; Paleontology
语种英语
WOS记录号WOS:000306159800011
出版者ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
资助机构National Basic Research Program of China(2009CB421008) ; National Basic Research Program of China(2009CB421008) ; NCET in China(NCET-07-0771) ; NCET in China(NCET-07-0771) ; Fundamental Research Funds for the Central Universities(2001YXL048) ; Fundamental Research Funds for the Central Universities(2001YXL048) ; National Basic Research Program of China(2009CB421008) ; National Basic Research Program of China(2009CB421008) ; NCET in China(NCET-07-0771) ; NCET in China(NCET-07-0771) ; Fundamental Research Funds for the Central Universities(2001YXL048) ; Fundamental Research Funds for the Central Universities(2001YXL048) ; National Basic Research Program of China(2009CB421008) ; National Basic Research Program of China(2009CB421008) ; NCET in China(NCET-07-0771) ; NCET in China(NCET-07-0771) ; Fundamental Research Funds for the Central Universities(2001YXL048) ; Fundamental Research Funds for the Central Universities(2001YXL048) ; National Basic Research Program of China(2009CB421008) ; National Basic Research Program of China(2009CB421008) ; NCET in China(NCET-07-0771) ; NCET in China(NCET-07-0771) ; Fundamental Research Funds for the Central Universities(2001YXL048) ; Fundamental Research Funds for the Central Universities(2001YXL048)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84774]  
专题中国科学院地质与地球物理研究所
通讯作者Shi, Guanghai
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.Amer Museum Nat Hist, New York, NY 10024 USA
3.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Shi, Guanghai,Grimaldi, David A.,Harlow, George E.,et al. Age constraint on Burmese amber based on U-Pb dating of zircons[J]. CRETACEOUS RESEARCH,2012,37:155-163.
APA Shi, Guanghai.,Grimaldi, David A..,Harlow, George E..,Wang, Jing.,Wang, Jun.,...&Li, Xianhua.(2012).Age constraint on Burmese amber based on U-Pb dating of zircons.CRETACEOUS RESEARCH,37,155-163.
MLA Shi, Guanghai,et al."Age constraint on Burmese amber based on U-Pb dating of zircons".CRETACEOUS RESEARCH 37(2012):155-163.

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来源：地质与地球物理研究所

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