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Fenna Bergmann

Institution: University of Bremen
Room: GEO building, room 4580
Phone: +49 421 218-65373
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Other webpage(s): Fenna's institute webpage



Fenna Bergmann

PhD project:

The Bengal Fan stratigraphy as a function of tectonic and climate – Correlation of IODP Expedition 354 results and available seismic data from the Bay of Bengal

In the early Eocene, when India and Asian collided, the Himalayan Mountains started to form. Contin-uous uplift not just resulted in the highest mountain chain on Earth, it also caused interactions with the local climate systems, initiated the Indian Monsoon and lead to intensified erosion. Most of the sediments eroded in the Himalaya are transported downslope within the two large rivers Ganges and Brahmaputra, until they reach the Bengal shelf. From there downslope transport continuous episodically via turbidity currents over hundreds to thousands of kilometers. Deposition of the sediments takes place on the submarine Bengal Fan, which is, with a maximum thickness of 16 km and a length of almost 3000 km, the largest submarine fan on Earth.
The Bengal Fan contains the most complete record of the Indian/Asian collision and is well suited to investigate the link between the tectonic uplift, the climate/monsoonal history of the region and its influence on the global carbon cycle because it contains almost 80% of the eroded Himalayan material.

In my PhD project I investigate the Bengal Fan depositional system based on an integrated dataset of multichannel seismic data and results of the IODP Expedition 354, which was conducted in February/March 2015. In the first part of my PhD project I concentrate the complex processing of all availa-ble multichannel seismic data to provide a high quality dataset with high signal/noise ratios, deep vertical penetration and high reflection coherency. The seismic dataset then allows a detailed seismo-stratigraphic analysis to understand the complex style of deposition within the Bengal Fan. Combined with the 7 drill sites of IODP Exp. 354, which are aligned on an East-West transect at 8°N (middle Ben-gal Fan) it is now possible to gain further inside into the key questions of the tectonic/climate interac-tion and the Indian monsoon evolution of the Himalayan – Bengal Fan area as well as to investigate the role of tectonic influences. Furthermore, the new dataset provides the excellent opportunity for the development of a significantly improved age model and a refined stratigraphy addressing the above mentioned aspects. Development of a ‘composite core’ over all 7 sites will be necessary due to the complicated style of deposition and is one major aspect of my PhD project.

Thesis committee:

Prof. Dr. Volkhard Spieß University of Bremen
Dr. Tilmann Schwenk University of Bremen
Dr. Hendrik Lantzsch University of Bremen
Dr. Christian France-Lanord Université de Lorraine, Nancy et Metz, France
GLOMAR Research Theme B