CONSTRAINING THE AGE OF NEOPROTEROZOIC GLACIATION IN EASTERN BRAZIL: FIRST U-Pb (SHRIMP) DATA OF DETRITAL ZIRCONS
نویسندگان
چکیده
منابع مشابه
(U-Th)/(He-Pb) DOUBLE DATING OF DETRITAL ZIRCONS
Geochronology and thermochronology on detrital material provides unique constraints on sedimentary provenance, depositional ages, and orogenic evolution of source terrains. In this paper we describe a method and case-studies of measurement of both U/Pb and (U-Th)/He ages on single crystals of zircon that improves the robustness of constraints in each of these areas by establishing both formatio...
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The Neoproterozoic Quruqtagh Group in the Tarim Block, NW China, contains multiple diamictites in the Bayisi, Altungol, Tereeken, and Hankalchough formations. These diamictites may represent three or possibly four discrete glaciations, although evidence for a glacial origin of the Bayisi and Altungol diamictite is ambiguous. To constrain their age and duration, we dated three volcanic beds (V1,...
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641 Geosphere; October 2010; v. 6; no. 5; p. 641–662; doi: 10.1130/GES00532.1; 12 fi gures; 4 tables; 1 supplemental fi le. 1Supplemental File 1. Excel fi le of U-Pb (zircon) geochronologic analyses by laser-ablation multicollector ICP mass spectrometry. If you are viewing the PDF of this paper or reading it offl ine, please visit http://dx.doi.org/10.1130/GES00532.S1 or the fulltext article on...
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A sample from near the base of the sedimentary Hammamat Group at Gebel Umm Tawat, North Eastern Desert, Egypt, contains detrital zircons with sensitive high-resolution ion microprobe (SHRIMP) U– Pb ages as young as 585 13 Ma. This age is within error of recent SHRIMP dates from the adjacent Dokhan Volcanic Series and establishes that they contributed material to the sediments. It is also c. 45 ...
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ژورنال
عنوان ژورنال: Revista Brasileira de Geociências
سال: 2000
ISSN: 0375-7536
DOI: 10.25249/0375-7536.2000301058061