Pelatihan : Techniques in Active Tectonic Study Juni 20-Juli 2, 2013 Instruktur: Prof. J Ramon Arrowsmith (JRA) Dari Arizona State University (ASU) - US.

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Presentation transcript:

Pelatihan : Techniques in Active Tectonic Study Juni 20-Juli 2, 2013 Instruktur: Prof. J Ramon Arrowsmith (JRA) Dari Arizona State University (ASU) - US Tempat Pelaksanaan: Ruang Pangea, Laboratorium Gempabumi (LabEarth) – Puslit Geoteknologi LIPI dan Kuliah lapangan akan dilakukan disekitar Sesar Lembang, Jawa Barat. * Lebih jelas baca TOR/KAK dan daftar acara

Cosmogenic radionuclide geochronology Outline of this lecture Overview of method and applications Surface dating for slip rate Profile dating for terrace age Burial dating for erosion rate Many figures from this textbook

High energy charged particles enter the Earths atmosphere and interact with it and the Earth surface to produce cosmogenic nuclides Modulated by solar activity, earth geomagnetic field, geography Main nuclides include: 14 7 N, 10 5 Be, Al, Cl, Ar, 3 He, 21 Ne ogy/geos462/11datingmeth.html Important reference: iles/cnefTCN-Method.html

Burbank and Anderson, 2011, Tectonic Geomorphology, Chapter 3

P 0 is production at the surface Z* is e-efolding depth (decrease by 1/e: ~2.7) Z is really total number of atoms dN/dt =P 0 – N N is number of atoms per unit volume t is time is radioactive decay

Target minerals Stable noble gases- Measure oldest surfaces in tens of million years 3 HeOlivine, Pyroxene, Fe/Ti-Oxide Minerals, Garnet 21 NeQuartz, Olivine, Pyroxene, Sanidine 38 ArCalcium, (experimental) Radiogenic- Order decreasing half lives 10 BeQuartz, Calcite, Sanidine 26 AlQuartz 36 ClWhole Rock, Feldspar 14 COlivine In Situ 14 CQuartz, Olivine (Schaefer and Lifton, 2007)

Data too noisy? Measuring different things? (age, offset, aperture) Missing earthquakes? Deformation zone evolution Lower crust and upper mantle High rates over long time and localized deformation important: continental deformation more plate-like Lower rates over long time and broad space: continental deformation more fluid-like Friedrich, et al., 2003 Deformation rate variation and the role of faulting

Dating surface boulder samples

178 ± 20 m retrodeformation 2.5 ± 0.4 mm/yr

290 ± 20 m retrodeformation 3.1 ± 0.4 mm/yr slip rate

Dating marine terraces: Santa Cruz, California

Burbank and Anderson, 2011, Tectonic Geomorphology, Chapter 3 Erosion rate in the watershed influences the inheritance

Burbank and Anderson, 2011, Tectonic Geomorphology, Chapter 3

Cosmogenic radionuclide geochronology Outline of this lecture Overview of method and applications Surface dating for slip rate Profile dating for terrace age Burial dating for erosion rate Many figures from this textbook

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