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Award Abstract #1110921

Collaborative Research: Tectonic and Magmatic Processes during Early-Stage Rifting: an Integrated Study of Northern Lake Malawi, Africa

NSF Org: EAR
Division Of Earth Sciences
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Initial Amendment Date: April 11, 2012
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Latest Amendment Date: June 29, 2016
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Award Number: 1110921
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Award Instrument: Continuing grant
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Program Manager: Leonard E. Johnson
EAR Division Of Earth Sciences
GEO Directorate For Geosciences
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Start Date: April 15, 2012
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End Date: March 31, 2017 (Estimated)
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Awarded Amount to Date: $2,456,663.00
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Investigator(s): Donna Shillington djs@ldeo.columbia.edu (Principal Investigator)
Scott Nooner (Co-Principal Investigator)
Cornelia Class (Co-Principal Investigator)
James Gaherty (Co-Principal Investigator)
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Sponsor: Columbia University
2960 Broadway
NEW YORK, NY 10027-6902 (212)854-6851
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NSF Program(s): CONTINENTAL DYNAMICS PROGRAM,
DEEP EARTH PROCESSES SECTION
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Program Reference Code(s):
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Program Element Code(s): 1581, 7571

ABSTRACT

Although the concept that thick continental lithosphere extends and ultimately ruptures has been accepted for over 50 years, the conditions required for this to occur and the factors that are most important in controlling the style of rifting, the formation and maintenance of tectonic segmentation and the initiation of magmatism remain contentious. This is especially true of the earliest stages of extension, in part because most studies focus on successfully rifted margins and mature rifts, where extensive stretching, syn- and post-rift magmatism, and post-breakup sedimentation overwrite and bury the record of incipient extension. Understanding how, why and when features that are characteristic of mid-ocean ridges and rifts first form and evolve during early rifting is essential for a broader understanding of plate divergence.

The primary scientific goal of this project is to examine the emergence and early evolution of two fundamental features of all divergent plate boundaries: magmatism and segmentation. Magmatism accommodates a significant percentage of plate separation at most mid-ocean ridges and late-stage rifts. Likewise, transform faults demarcate discrete spreading segments in mid-ocean ridges, which are broadly

characterized by more robust magmatism at their centers than at their edges. Well-developed magmatic and tectonic segmentation is also observed in late-stage rifts and new ocean basins However,little is known about the controls on the initiation and development of magmatism and segmentation in young rifts. Specifically, th PIs seek to address the following questions:

? When, where and why does magmatism initiate in rifts, and what is its role in accommodating extension?

? What controls the development of tectonic segmentation in early-stage rifts? How is it manifested in 4D patterns of magmatism

and deformation.

The project consists of an integrated geophysical, geochemical and geological study of the northern Lake Malawi region in the East African Rift System (EARS) to address these questions. This is one of the few places in the world that has all of the ingredients necessary for a comprehensive study of early rifting. Active and passive seismic data and MT data will reveal the 3D structure of the crust and lithosphere at a variety of length scales, from the architecture of border faults and accommodation zones to the distribution of deformation and magma (if present) in the mantle lithosphere. Surface deformation, seismicity, and rift stratigraphy, as well as geochronology, thermobarometry and geochemistry of volcanic rocks, will yield constraints on the origin of magmatism and the evolution of deformation and magmatism at a range of time scales, including possibly variable contributions from sub-lithospheric versus lithospheric sources. Comparisons of active and cumulative deformation patterns will enable the evaluation of the importance of episodicity, seismicity and magmatism in accommodating extension and how they relate to segmentation. This powerful combination of temporal and spatial constraints will produce unique insights into the initiation of segmentation and magmatism during continental rifting.


PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH

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McCartney, T.; Scholz, C.A.; Shillington, D.J.; Accardo, N.J.; Chindandali, P.; Kamihanda, G.. "The Central Lake Malawi (Nyasa) Rift: single or multiple rift segments?," Eos. Trans Fall AGU Meeting, 2015.

Scholz, C.; Wood, D.; Shillington, D.J.; McCartney, T.; Accardo, N.J.. "Early-stage rifting in the southwest East African Rift: Insights from new reflection seismic data from Lakes Tanganyika and Malawi (Nyasa).," Eos. Trans Fall AGU Meeting, 2015.

Accardo, N.J.; Gaherty, J.B.; Shillington, D.J.; Nyblade, A.; Ebinger, C.J.; Mbogoni, G.; Chindandali, P.; Mulibo, G.; Ferdinand, R., Kamihanda, G.. "Rayleigh-wave imaging of upper-mantle shear velocities beneath the Malawi Rift; Preliminary results from the SEGMeNT experiment.," Eos. Trans. Fall AGU Meeting, 2015.

Grijalva, A., Kachingwe, M; Nyblade, A.; Shillington, D.J.; Gaherty, J.B.; Ebinger, C.J.; Accardo, N.J.; O?Donnell, J.P.; Mbogoni, G.; Mulibo, G.; Ferdinand, R., Chindandali, P.; Mphepo, F.. "Upper mantle P-wave velocity structure beneath northern Lake Malawi and the Rungwe Volcanic Province, East Africa," Eos. Trans Fall AGU Meeting, 2015.

Shillington, D.J.; Scholz, C.A.; Gaherty, J.B.; Accardo, N.J.; McCartney, T.; Chindandali, P.; Kamihanda, G.; Trinhammer, P.; Wood, D.; Khalfan, M.; Ebinger, C.J.; Nyblade, A.A.; Mbogoni, G.; Mruma, A.; Salima, J.; Ferdinand-Wambura, R.. "Active-source seismic imaging below Lake Malawi (Nyasa) from the SEGMeNT project," Eos. Trans. Fall AGU Meeting, 2015.

Borrego, D.; Kachingwe, M; Nyblade, A.; Shillington, D.J.; Gaherty, J.B.; Ebinger, C.J.; Accardo, N.J.; O?Donnell, J.P.; Mbogoni, G.; Mulibo, G.; Ferdinand, R., Chindandali, P.; Mphepo, F.; Tepp, G.; Kamihanda, G.. "Crustal Structure in Northern Malawi and Southern Tanzania surrounding Lake Malawi and the Rungwe Volcanic Province.," Eos. Trans Fall AGU Meeting, 2015.

Ebinger, C.J.; Keir, D.; Roecker, S.; Tiberi, C.; Aman, M.; Weinstein, A.; Lambert, C.; Drooff, C.; Oliva, S.J.; Peterson, K., Bourke, J.; Rodzianko, A.; Gallacher, R.; Lavayssier, A.; Shillington, D.J.; Khalfan, M.; Mulibo, G.; Fernindan-Wambura, R.; Pal. "Crustal Strain Patterns in Magmatic and Amagmatic Early Stage Rifts: Border Faults, Magma Intrusion, and Volatiles (Invited)," Eos. Trans. Fall AGU Meeting, 2015.

 

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