Dating Thrust Events Using87Sr/86Sr: An Example from the Northern Apennines, Italy
| Autor: | P. L. Fantozzi, K. E. Carter, M. Meccheri, Luigi Carmignani, S. I. Dworkin |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | The Journal of Geology. 102:297-305 |
| ISSN: | 1537-5269 0022-1376 |
| DOI: | 10.1086/629672 |
| Popis: | Isotopic and petrographic analyses of the major thrust zone (Calcare Cavernoso) in the Apuane region of the Northern Apennines are used to date the timing of motion on that thrust zone and to document the type and the amount of fluid focused there. The thrust zone consists of a porous cataclasite composed of polylithologic clasts and finely crystalline dolomite included within a recrystallized calcite matrix that shows no affect of subsequent brittle or ductile deformation. $^{87}Sr/^{86}Sr$ isotopic compositions of clasts and matrix from around the entire Apuane region ($1000 km^{2}$) are very uniform, with values that average 0.70811. The strontium data suggest recrystallization of the entire thrust zone by huge volumes of focused fluid flow that caused complete and uniform resetting of the original Triassic Sr isotopic signature by Oligocene sea water during Oligocene thrusting. Preservation of fragile vein networks that also yield the Oligocene sea water Sr ratios suggests that significant post-thrust... |
| Databáze: | OpenAIRE |
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