Miocene tidal-influenced sedimentation to continental Pliocene sedimentation in the forebulge backbulge depozones of the Beni Mamore foreland Basin (northern Bolivia)
International audience Mio-Pliocene deposits of the forebulge backbulge depozones of the Beni-Mamore foreland Basin indicate tidally to fluvially dominated sedimentation. Seven facies assemblages have been recognized: FAA FAG. FAA represents a distal bottom lake assemblage, FAB and FAD are interpret...
Published in: | Journal of South American Earth Sciences |
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Main Authors: | , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2006
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Subjects: | |
Online Access: | https://hal.science/hal-00320050 https://doi.org/10.1016/J.JSAMES.2005.11.004 |
Summary: | International audience Mio-Pliocene deposits of the forebulge backbulge depozones of the Beni-Mamore foreland Basin indicate tidally to fluvially dominated sedimentation. Seven facies assemblages have been recognized: FAA FAG. FAA represents a distal bottom lake assemblage, FAB and FAD are interpreted as tidal flat deposits, FAC and FAG are interpreted as fluvial systems, FAE sediments are deposited in a subtidal/shoreface setting, and FAG represents a meandering fluvial system. The identification of stratigraphic surfaces (SU, MFS, and MRS) and the relationship among the facies assemblages permit the characterization of several systems tracts: a falling-stage systems tract (FSST) followed by a lowstand systems tract (LST), a transgressive systems tract (TST), and a highstand systems tract (HST). The FSST and LST may have been controlled by the uplift of the Beni-Mamore forebulge, whereas TST may result from a quiescent stage in the forebulge. Subaerial unconformity two (SU2) records the passage from a tide-influenced depositional system to a fully continental depositional system. The Miocene tidal-influenced deposits in the Beni Mamore Basin suggest that it experienced a connection, either with the South Atlantic Ocean or the Caribbean Sea or both. |
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