dc.contributor.author |
Mathu, Eliud M. |
|
dc.contributor.author |
Bauernhofer, A. H. |
|
dc.contributor.author |
Hauzenberger, C. A. |
|
dc.contributor.author |
Handler, R. |
|
dc.contributor.author |
Wallbrecher, E. |
|
dc.contributor.author |
Hoinkes, G. |
|
dc.contributor.author |
Muhongo, S. |
|
dc.date.accessioned |
2015-08-25T09:12:30Z |
|
dc.date.available |
2015-08-25T09:12:30Z |
|
dc.identifier.uri |
http://academic.research.microsoft.com/Publication/10917023/40ar-39ar-cooling-ages-of-pan-african-structures-from-the-mozambique-belt-in-se-kenya-implications |
|
dc.identifier.uri |
http://repository.seku.ac.ke/handle/123456789/1372 |
|
dc.description.abstract |
Ar/39Ar cooling ages of hornblende, biotite and muscovite are presented from the Taita Hills-Galana River area, SE Kenya. Ages of ~580-560 Ma are derived from hornblende and biotite from rocks belonging to a S-SW oriented thrust pile in the westernmost part of the study area (Taita Hills). These ages document cooling subsequent to a phase of thrusting and uplift in the orogen. Muscovite from an unfoliated pegmatite from the same area shows an age of ~505 Ma which is interpreted as incipient post-tectonic cooling. An adjacent domain characterized by large-scale strike slip shear (western Galana River) exhibits cooling ages of ~525 Ma (hornblende) and ~500- 490 Ma (biotite), respectively. These ages most likely constrain a late phase of post-collisional tectonics in the orogen. Between both domains biotites from a small zone containing distinct gneiss rigdes show a cooling age of ~548 Ma. In the easternmost part of the study area (eastern Galana River) a hornblende cooling age of ~519 Ma suggest a tectonic relationship to the strike slip domain. A combination of the 40Ar/39Ar- and recent U-Pb- and Sm-Nd age data support a polycyclic metamorphic evolution of the region as well as differences in the cooling history for certain domains. |
|
dc.language.iso |
en |
en_US |
dc.title |
40ar/39AR cooling ages of Pan-African structures from the Mozambique belt in SE Kenya: implications for the cooling history |
en_US |
dc.type |
Article |
en_US |