Chatterjee, Nilanjan and Nicolaysen, Kirsten (2012): An intercontinental correlation of the mid-Neoproterozoic Eastern Indian tectonic zone; evidence from the gneissic clasts in Elan Bank conglomerate, Kerguelen Plateau
Leg/Site/Hole:
Related Expeditions:
ODP 183 ODP 183 1137
Identifier:
ID:
2012-071289
Type:
georefid
ID:
10.1007/s00410-011-0699-z
Type:
doi
Creator:
Name:
Chatterjee, Nilanjan
Affiliation:
Massachusetts Institute of Technology, Department of Earth Sciences, Atmospheric and Planetary Sciences, Cambridge, MA, United States
Role:
author
Name:
Nicolaysen, Kirsten
Affiliation:
Whitman College, United States
Role:
author
Identification:
Title:
An intercontinental correlation of the mid-Neoproterozoic Eastern Indian tectonic zone; evidence from the gneissic clasts in Elan Bank conglomerate, Kerguelen Plateau
Year:
2012
Source:
Contributions to Mineralogy and Petrology
Publisher:
Springer International, Heidelberg - New York, International
Volume:
163
Issue:
5
Pages:
789-806
Abstract:
The Kerguelen Plateau is a submarine, Cretaceous Large Igneous Province in the southern Indian Ocean. Drilling on Elan Bank, a western salient of the Kerguelen Plateau, yielded a approximately 26 m section of fluvial conglomerate intercalated with basalt. Chemical dating of monazite within garnet and matrix monazite in metapelitic clasts from the conglomerate indicates that high-grade metamorphism of the pelitic protolith occurred between 785+ or - 2 and 694+ or -18 Ma. A calculated P-T pseudosection indicates that the observed core-to-inner rim compositional zoning in garnet is consistent with P/T decrease from 10.2 kb/760 degrees C to 6.2 kb/560 degrees C. In an Early Cretaceous paleogeographic reconstruction, the Elan Bank drill site is located on a SSW continuation of the Eastern Indian Tectonic Zone (EITZ), a 876-784 Ma, NNE-SSW metamorphic belt with sinistral shear zones in eastern India. The retrograde P-T path of the Elan Bank metapelitic clast overlaps with that of the EITZ metapelite, and the Elan Bank monazite chemical dates and previously determined 824-675 Ma U-Pb isotope monazite dates by the TIMS method are remarkably similar to the monazite chemical dates from the EITZ metapelites and high-grade metamorphic rocks from the eastern margin of the Eastern Ghats Belt. Based on the demonstrable affinity of metamorphic, geochronologic, and spatial data, this study concludes that the EITZ was likely a continuous, approximately 1,800-km-long tectono-metamorphic belt in the Rodinia supercontinent stretching from eastern India through the Eastern Ghats to the basement of Elan Bank and probably to the Rayner Complex of East Antarctica. Copyright 2011 Springer-Verlag
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:-56.5000 West:68.0536 East:
68.0536 South:-56.5000
Keywords: Geochronology; Igneous and metamorphic petrology; absolute age; Antarctica; Asia; clastic rocks; conglomerate; correlation; crystal chemistry; dates; East Antarctica; Eastern Ghats; Eastern Indian tectonic zone; Elan Bank; electron probe data; geochemistry; geologic barometry; geologic thermometry; Ghats; India; Indian Ocean; Indian Peninsula; Kerguelen Plateau; Leg 183; lithostratigraphy; major elements; metamorphic rocks; metamorphism; metapelite; metasedimentary rocks; minor elements; monazite; Neoproterozoic; Ocean Drilling Program; ODP Site 1137; P-T conditions; petrology; phosphates; Precambrian; Proterozoic; Rodinia; sedimentary rocks; textures; U/Pb; upper Precambrian;
.