Zircon U–Pb geochronology and Hf isotope of felsic volcanics from Attappadi, southern India: Implications for Neoarchean convergent margin tectonics

2014 ◽  
Vol 26 (3-4) ◽  
pp. 907-924 ◽  
Author(s):  
M.N. Praveen ◽  
M. Santosh ◽  
Q.Y. Yang ◽  
Z.C. Zhang ◽  
H. Huang ◽  
...  
Keyword(s):  
Hf Isotope ◽  
Southern India ◽  
Convergent Margin

Lu–Hf isotope evidence for Paleoproterozoic metamorphism and deformation of Archean oceanic crust along the Dharwar Craton margin, southern India

2013 ◽  
Vol 233 ◽  
pp. 206-222 ◽  
Author(s):  
Niels M. Noack ◽  
Reiner Kleinschrodt ◽  
Maria Kirchenbaur ◽  
Raúl O.C. Fonseca ◽  
Carsten Münker
Keyword(s):  
Oceanic Crust ◽  
Dharwar Craton ◽  
Hf Isotope ◽  
Southern India ◽  
Isotope Evidence

scholarly journals Detrital zircon geochronology and Hf isotope geochemistry of Mesozoic sedimentary basins in south-central Alaska: Insights into regional sediment transport, basin development, and tectonics along the NW Cordilleran margin

Geosphere ◽  
2020 ◽  
Vol 16 (5) ◽  
pp. 1125-1152 ◽  
Author(s):  
Cooper R. Fasulo ◽  
Kenneth D. Ridgway ◽  
Jeffrey M. Trop
Keyword(s):  
Detrital Zircon ◽  
Lower Cretaceous ◽  
Sedimentary Basins ◽  
Upper Jurassic ◽  
Detrital Zircons ◽  
Hf Isotope ◽  
Published Data ◽  
Convergent Margin ◽  
South Central ◽  
Detrital Zircon Ages

Abstract The Jurassic–Cretaceous Nutzotin, Wrangell Mountains, and Wellesly basins provide an archive of subduction and collisional processes along the southern Alaska convergent margin. This study presents U-Pb ages from each of the three basins, and Hf isotope compositions of detrital zircons from the Nutzotin and Wellesly basins. U-Pb detrital zircon ages from the Upper Jurassic–Lower Cretaceous Nutzotin Mountains sequence in the Nutzotin basin have unimodal populations between 155 and 133 Ma and primarily juvenile Hf isotope compositions. Detrital zircon ages from the Wrangell Mountains basin document unimodal peak ages between 159 and 152 Ma in Upper Jurassic–Lower Cretaceous strata and multimodal peak ages between 196 and 76 Ma for Upper Cretaceous strata. Detrital zircon ages from the Wellesly basin display multimodal peak ages between 216 and 124 Ma and juvenile to evolved Hf compositions. Detrital zircon data from the Wellesly basin are inconsistent with a previous interpretation that suggested the Wellesly and Nutzotin basins are proximal-to-distal equivalents. Our results suggest that Wellesly basin strata are more akin to the Kahiltna basin, which requires that these basins may have been offset ∼380 km along the Denali fault. Our findings from the Wrangell Mountains and Nutzotin basins are consistent with previous stratigraphic interpretations that suggest the two basins formed as a connected retroarc basin system. Integration of our data with previously published data documents a strong provenance and temporal link between depocenters along the southern Alaska convergent margin. Results of our study also have implications for the ongoing discussion concerning the polarity of subduction along the Mesozoic margin of western North America.

Sign in / Sign up

Export Citation Format

Share Document