Origin of Meteoric Fluids in Extensional Detachments
Minerals in veins and shear zones often show oxygen and hydrogen isotope ratios that are interpreted as recording interaction with meteoric water, at depths up to about 10 km. Downward fluid flow to these depths can only occur in the unlikely case of fluid pressures that are significantly lower than...
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| Format: | Article |
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Wiley
2020-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2020/7201545 |
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| author | Paul D. Bons Enrique Gomez-Rivas |
| author_facet | Paul D. Bons Enrique Gomez-Rivas |
| author_sort | Paul D. Bons |
| collection | DOAJ |
| description | Minerals in veins and shear zones often show oxygen and hydrogen isotope ratios that are interpreted as recording interaction with meteoric water, at depths up to about 10 km. Downward fluid flow to these depths can only occur in the unlikely case of fluid pressures that are significantly lower than lithostatic overburden pressures. We therefore propose that fluid movement was upward instead of downward. In our model, the pore space within sediments and exhumed rocks below an unconformity is filled with meteoric and possibly seawater fluids. Burial of these rocks traps the fluids that can retain their meteoric isotopic composition as long as temperatures remain below about 300-350°C. Extension or rapid exhumation, such as that experienced by metamorphic core complexes, which results in decompression or fluid heating can release these old “meteoric” fluids, of which we find the isotopic fingerprint in veins and shear zone minerals. |
| format | Article |
| id | doaj-art-37838e22fa4043a19b7c0ec813970cb3 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-37838e22fa4043a19b7c0ec813970cb32025-02-03T00:59:41ZengWileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/72015457201545Origin of Meteoric Fluids in Extensional DetachmentsPaul D. Bons0Enrique Gomez-Rivas1China University of Geosciences (Beijing), Xueyuan Road 29, Haidian District, 100083 Beijing, ChinaDepartament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Barcelona 08028, SpainMinerals in veins and shear zones often show oxygen and hydrogen isotope ratios that are interpreted as recording interaction with meteoric water, at depths up to about 10 km. Downward fluid flow to these depths can only occur in the unlikely case of fluid pressures that are significantly lower than lithostatic overburden pressures. We therefore propose that fluid movement was upward instead of downward. In our model, the pore space within sediments and exhumed rocks below an unconformity is filled with meteoric and possibly seawater fluids. Burial of these rocks traps the fluids that can retain their meteoric isotopic composition as long as temperatures remain below about 300-350°C. Extension or rapid exhumation, such as that experienced by metamorphic core complexes, which results in decompression or fluid heating can release these old “meteoric” fluids, of which we find the isotopic fingerprint in veins and shear zone minerals.http://dx.doi.org/10.1155/2020/7201545 |
| spellingShingle | Paul D. Bons Enrique Gomez-Rivas Origin of Meteoric Fluids in Extensional Detachments Geofluids |
| title | Origin of Meteoric Fluids in Extensional Detachments |
| title_full | Origin of Meteoric Fluids in Extensional Detachments |
| title_fullStr | Origin of Meteoric Fluids in Extensional Detachments |
| title_full_unstemmed | Origin of Meteoric Fluids in Extensional Detachments |
| title_short | Origin of Meteoric Fluids in Extensional Detachments |
| title_sort | origin of meteoric fluids in extensional detachments |
| url | http://dx.doi.org/10.1155/2020/7201545 |
| work_keys_str_mv | AT pauldbons originofmeteoricfluidsinextensionaldetachments AT enriquegomezrivas originofmeteoricfluidsinextensionaldetachments |