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Formation and Diagenesis of Sedimentary Rocks in Gale Crater, Mars The Mars Science Laboratory rover Curiosity has explored over 200 m of exposed crater-fill stratigraphy dominated by fluvio-deltaic sandstones and lacustrine mudstones. During this traverse, Curiosity has acquired over 400 bulk chemistry measurements of in-situ sedimentary rock surfaces using an Alpha-Particle X-ray Spectrometer (APXS). Each of these compositions represents a mixture of volcaniclastic detrital grains sorted by transport processes and cemented by diagenetic fluids, but we can begin to separate these distinct influences and…Find out more »
Who: Dr. Min Chen & Hehe Jiang When: Noon, Friday, March 31, 2017 Where: Room 100, KWGL What: Chen: Lithospheric foundering and underthrusting imaged beneath Tibet Long-standing debates exist over the timing and mechanism of uplift of Tibetan Plateau, and more specifically, over the connection between lithospheric evolution and the surface expressions of plateau uplift and volcanism. Our new tomographic model reveals a T-shaped high wave speed structure beneath South-Central Tibet, interpreted as remnant in the upper mantle…Find out more »
ESCI Seminar: Robert Stern Title: Evolution of Plate Tectonics Abstract: Plate tectonics is the central theory explaining how the solid Earth behaves today. The outer thermal boundary layer – the lithosphere – is fragmented into 7 major plates and many more smaller plates, all of which move independently. We understand plate kinematics very well and plate dynamics reasonably well, but there is no consensus in the geoscientific community about how or when Earth’ present tectonic style came into being. We…Find out more »
Who: Gary Linkevich & Proteek Chowdhury When: Noon, Friday, April 7, 2017 Where: Room 100, KWGL What: Linkevich "3D Seismic Observations of the Peridotite Ridge in the Deep Galicia Margin" The west coast of the Iberian Peninsula is a classic magma-poor rifted margin, where slow crustal hyperextension allowed the mantle rising beneath to cool and harden, instead of melting. The boundary between the last crustal blocks and this transitional zone of exhumed mantle is marked by a long, margin-parallel peridotite…Find out more »
Who: Chengzu Wang & Sriparna S When: Noon, Friday, April 14, 2017 Where: Room 100, KWGL What: Wang: "Rates of Motion of Groups of Hotspots Estimated from the Dispersion of Hotspot Trends” Abstract: "While it is widely believed that groups of hotspots in different regions of the world are in relative motion at rates of 10 to 30 mm a-1 or more, recent work on plate motions over the past ≈50 Ma indicate no significant motion between hotspots beneath different plates and…Find out more »
ESCI Seminar: Nick Swanson-Hysell Title: Rapid rates of Proterozoic paleogeographic change Abstract: Progressions of paleomagnetic poles are known as apparent polar wander paths (APWPs) and enable the development of ancient paleogeographic reconstructions. In Precambrian time, reliable paleomagnetic poles on a given craton are often widely spread in time restricting the possibility of generating well-resolved APWPs. The development of the North American Midcontinent Rift between ca. 1110 and 1080 Ma has provided an opportunity to develop extensive paleomagnetic data sets spanning…Find out more »
For outside visitors, the best way to get to our department is to come in on Rice Blvd and turn into entrance 20 (intersection of Rice and Kent St.). At the stop sign, you will see a visitor parking lot. From there, walk east to the department. The google map below shows exactly where our building is.