期刊
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
卷 54, 期 3, 页码 353-360出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00288306.2011.582123
关键词
Eocene; McMurdo Erratics; zircon; detrital; provenance
资金
- EAA/CR Meyer Endowed Professorship
- National Science Foundation [EAR-0443387, 0342484]
Some of the most important Cenozoic sedimentary rocks in Antarctica are glacial erratics of fossiliferous Palaeogene to Neogene siliclastic rocks known as the McMurdo Erratics. Detrital zircon U-Pb isotopic data reported herein provide new information on the provenance of these siliciclastic rocks. The U-Pb age data from a sandstone glacial erratic that is likely of Eocene age show a dominant age cluster that ranges from 488 to 635 Ma, accompanied by subsidiary Neoproterozoic-Archaean peaks. The dominant Neoproterozoic-Ordovician age cluster, in conjunction with the arkosic lithologies of some erratics and the local presence of granitic and metasedimentary clasts, indicates that the Neoproterozoic-Ordovician basement complex of the Transantarctic Mountains likely served as a major source for the Eocene siliciclastic sediments. This is consistent with derivation of the McMurdo Erratics from locations proximal to the Transantarctic Mountains such as the Discovery Deep and/or major mountain outlet glacier areas.
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