Abstract
Analysis of foraminifera for synorogenic pelagic units of Rote and Savu Islands, Indonesia, reveals high rates of surface uplift in the past 1.5 Ma of the incipient Banda arc-continent collision. Paleodepth estimates are derived from benthonic forams and ages from planktonic forams. But estimates are complicated, however, by abundant reworking; yet several distinctive species have been found. Synorogenic deposits in western Rote yield forams of biozone Neogene (N) 18 and depths from 5000-5700 meters at the base of the section, and 3600 meters at the top of the section. Eastern Rote yields forams of N 19/20 - N 22 and depths from 5400-5700 meters. Central Rote yields N 21 and depths from 5000-5700 meters. Because all of the sections are presently about the same elevation (~200 m), long-term surface uplift rates are slightly higher (1.84-3.29 m/yr) in eastern and central Rote than those in western Rote. Forams from Savu yield ages of N19/20 - N 22. Across Savu depth estimates range from 3200-5700 meters, which yields a range of uplift rates from 1.86 mm/yr in SE Savu to 3.25 mm/yr in Central Savu. These results indicate the Banda arc-continent collision caused uplift of Rote and Savu at rates of 1-2 mm/yr over the past 3 Ma.
Degree
MS
College and Department
Physical and Mathematical Sciences; Geological Sciences
Rights
http://lib.byu.edu/about/copyright/
BYU ScholarsArchive Citation
Roosmawati, Nova, "Long-Term Surface Uplift History of the Active Banda Arc-Continent Collision: Depth and Age Analysis of Foraminifera from Rote and Savu Islands, Indonesia" (2005). Theses and Dissertations. 559.
https://scholarsarchive.byu.edu/etd/559
Date Submitted
2005-07-06
Document Type
Thesis
Handle
http://hdl.lib.byu.edu/1877/etd887
Keywords
Foraminifera, uplift, synorogenic, depth analysis, age analysis, Banda arc, Rote, Savu, Timor, reworked fossil, plankton, benthic, collision, progressive, Indonesia
Language
English