Pieces of Laurentia in East Antarctica

Summary Geologic, age and isotopic data from the central Transantarctic Mountains provide a unique test of the Rodinia fit between East Antarctica and Laurentia. Evidence supporting a SWEAT-type fit includes: (1) similar Nd-isotope crustal age provinces; (2) similarity of ~1.7 Ga crustal events; (3)...

Full description

Bibliographic Details
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Antarctic
East Antarctic Ice Sheet
East Antarctica
Nimrod
Nimrod Glacier
Transantarctic Mountains
Antarc*
Antarctica
Ice Sheet
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.550.6239
http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea055.pdf
Description
Summary:Summary Geologic, age and isotopic data from the central Transantarctic Mountains provide a unique test of the Rodinia fit between East Antarctica and Laurentia. Evidence supporting a SWEAT-type fit includes: (1) similar Nd-isotope crustal age provinces; (2) similarity of ~1.7 Ga crustal events; (3) provenance link between ~1.4 Ga detrital zircons in Antarctic rift-margin strata and Mesoproterozoic A-type granites in Laurentia; (4) associated 1.8-1.6 Ga detrital zircons in these strata; and (5) similarity in ages of rift-margin formation. New isotopic and age data include: (6) ~1.4 Ga Antarctic-margin detrital zircons have Hf-isotopic compositions matching the A-type Laurentian granites; and (7) a newly discovered A-type rapakivi granite boulder in glacial till at Nimrod Glacier has a U-Pb zircon age of ~1440 Ma, indicating the presence of Mesoproterozoic granites beneath the East Antarctic ice sheet. We suggest that these

Similar Items