Global Events Across the Mesoproterozoic-Neoproterozoic Boundary: C and Sr Isotopic Evidence from Siberia

DSpace/Manakin Repository

Global Events Across the Mesoproterozoic-Neoproterozoic Boundary: C and Sr Isotopic Evidence from Siberia

Citable link to this page

. . . . . .

Title: Global Events Across the Mesoproterozoic-Neoproterozoic Boundary: C and Sr Isotopic Evidence from Siberia
Author: Pope, Michael C.; Kaufman, Alan J.; Semikhatov, Mikhail A.; Bartley, Julie K.; Knoll, Andrew Herbert; Jacobsen, Stein B.

Note: Order does not necessarily reflect citation order of authors.

Citation: Bartley, Julie K., Mikhail A. Semikhatov, Alan J. Kaufman, Andrew H. Knoll, Michael C. Pope, and Stein B. Jacobsen. 2001. Global events across the Mesoproterozoic-Neoproterozoic boundary: C and Sr isotopic evidence from Siberia. Precambrian Research 111, no. 1-4: 165-202.
Access Status: At the direction of the depositing author this work is not currently accessible through DASH.
Full Text & Related Files:
Abstract: Thick, unmetamorphosed successions of siliciclastic and carbonate rocks in eastern and western Siberia preserve a record of Middle Riphean to Early Upper Riphean sedimentary environments and geochemistry. Consistent with data from other continents, our studies in the Uchur-Maya region in southeastern Siberia and the Turukhansk Uplift in northwestern Siberia suggest a first-order shift in delta C-13 from values near 0 parts per thousand in the early Mesoproterozoic to values near +3.5 parts per thousand after about 1300 Ma. Over this same interval, primary Sr-87/Sr-86 values decrease from > 0.7060 to < 0.7053. Combining lithologic, biostratigraphic, and geochemical data sets with available geochronologic constraints, we present a refined correlation between these two key Proterozoic successions in Siberia and add this dataset to a growing body of C and Sr isotopic data from this time interval, Carbon isotope chemostratigraphy from these regions supports the occurrence and timing of a first-order, similar to 3.5 parts per thousand positive shift ca. 1250-1300 Ma, approximately coeval with the onset of active margin activity that predates the main phase of Rodinia assembly. Sr isotopic data may also be interpreted within the context of the evolving Mesoproterozoic tectonic regime. Available data suggest that no dramatic rise in Sr-87/Sr-86 heralds the main phase of Rodinia assembly in the terminal Mesoproterozoic, suggesting that significant juvenile crust was involved in mountain building, that relative hydrothermal flux from mid-ocean ridges remained high throughout the assembly of Rodinia and/or that increased continental runoff related to intense erosion of Grenvillian mountain belts terminated shortly after orogeny.
Published Version: http://dx.doi.org/10.1016/S0301-9268(01)00160-7
Other Sources: http://www.geol.umd.edu/~kaufman/pdf/Bartley_01.pdf
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3659700

Show full Dublin Core record

This item appears in the following Collection(s)

  • FAS Scholarly Articles [7456]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

Search DASH


Advanced Search
 
 

Submitters