TY - JOUR
T1 - Kinematics of the southern Red Sea-Afar Triple Junction and implications for plate dynamics
AU - McClusky, Simon
AU - Reilinger, Robert
AU - Ogubazghi, Ghebrebrhan
AU - Amleson, Aman
AU - Healeb, Biniam
AU - Vernant, Philippe
AU - Sholan, Jamal
AU - Fisseha, Shimelles
AU - Asfaw, Laike
AU - Bendick, Rebecca
AU - Kogan, Lewis
PY - 2010/3
Y1 - 2010/3
N2 - GPS measurements adjacent to the southern Red Sea and Afar Triple Junction, indicate that the Red Sea Rift bifurcates south of 17 N latitude with one branch following a continuation of the main Red Sea Rift (∼150 Az.) and the other oriented more N-S, traversing the Danakil Depression. These two rift branches account for the full Arabia-Nubia relative motion. The partitioning of extension between rift branches varies approximately linearly along strike; north of ∼16N latitude, extension (∼15 mm/yr) is all on the main Red Sea Rift while at ∼13N, extension (∼20 mm/yr) has transferred completely to the Danakil Depression. The Danakil Block separates the two rifts and rotates in a counterclockwise sense with respect to Nubia at a present-day rate of 1.9 0.1/Myr around a pole located at 17.0 0.2N, 39.7 0.2E, accommodating extension along the rifts and developing the roughly triangular geometry of the Danakil Depression. Rotating the Danakil Block back in time to close the Danakil Depression, and assuming that the rotation rate with respect to Nubia has been roughly constant, the present width of the Danakil Depression is consistent with initiation of block rotation at 9.3 4 Ma, approximately coincident with the initiation of ocean spreading in the Gulf of Aden, and a concomitant ∼70% increase in the rate of Nubia-Arabia relative motion.
AB - GPS measurements adjacent to the southern Red Sea and Afar Triple Junction, indicate that the Red Sea Rift bifurcates south of 17 N latitude with one branch following a continuation of the main Red Sea Rift (∼150 Az.) and the other oriented more N-S, traversing the Danakil Depression. These two rift branches account for the full Arabia-Nubia relative motion. The partitioning of extension between rift branches varies approximately linearly along strike; north of ∼16N latitude, extension (∼15 mm/yr) is all on the main Red Sea Rift while at ∼13N, extension (∼20 mm/yr) has transferred completely to the Danakil Depression. The Danakil Block separates the two rifts and rotates in a counterclockwise sense with respect to Nubia at a present-day rate of 1.9 0.1/Myr around a pole located at 17.0 0.2N, 39.7 0.2E, accommodating extension along the rifts and developing the roughly triangular geometry of the Danakil Depression. Rotating the Danakil Block back in time to close the Danakil Depression, and assuming that the rotation rate with respect to Nubia has been roughly constant, the present width of the Danakil Depression is consistent with initiation of block rotation at 9.3 4 Ma, approximately coincident with the initiation of ocean spreading in the Gulf of Aden, and a concomitant ∼70% increase in the rate of Nubia-Arabia relative motion.
UR - http://www.scopus.com/inward/record.url?scp=77949283329&partnerID=8YFLogxK
U2 - 10.1029/2009GL041127
DO - 10.1029/2009GL041127
M3 - Article
AN - SCOPUS:77949283329
SN - 0094-8276
VL - 37
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 5
M1 - L05301
ER -