Wireline sedimentology : resedimented volcaniclastites
Wireline sedimentology : resedimented volcaniclastites
The main focus of this thesis is to explore and develop the application of wireline logs in solving sedimentological problems, and so to further underline the importance of Wireline Sedimentology as a distinct discipline. The principal logs used are Formation MicroScanner (FMS) images, together with dipmeter-microresistivity, gamma ray and geochemical plots, taken during ODP Leg 129 in the Pigafetta and E. Mariana Basins, W. Central Pacific.
Seven resedimented volcaniclastic facies including slumps, debrites, and turbidites are recognised within thick (115-221 m) but poorly recovered (4-68%) Cretaceous and Miocene-Pliocene volcaniclastic units. A combination of wireline logs calibrated or correlated with recovered intervals and with known signatures, can be used to delineate facies in poorly recovered and badly disturbed coring intervals and hence to construct a complete borehole record of FMS image descriptions (FIDs). From these, it is possible to identify macro-, meso- and microsequences (> 100, 10-100 & < 10m thick respectively) of turbidite facies on the basis of bed-thickness trends. Whereas the macro- and mesosequences are a response to allocyclic volcano-tectonic controls, both oscillation and saw-tooth microsequences reflect autocyclic controls, including turbidite compensation effects. A new model for the sedimentary successions developed around volcanic archipelagoes and within mid-ocean basins is presented, taking into account the types of sequence observed and their likely controls.
Since FMS images formed the basis of all interpretations outlined above, a scheme defining the context of FMS image data sequences is proposed, that includes: physical, global, and local contexts. This method of approach can be used in part or in full to document even very fine scale sedimentological features and to interpret their origin (e.g., bed pinch-out direction, based on cross-lamination or bioturbation).
University of Southampton
Salimullah, Ali Reza Mohammed
17e4e670-9567-418f-ba68-d634fd0085c8
1993
Salimullah, Ali Reza Mohammed
17e4e670-9567-418f-ba68-d634fd0085c8
Salimullah, Ali Reza Mohammed
(1993)
Wireline sedimentology : resedimented volcaniclastites.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The main focus of this thesis is to explore and develop the application of wireline logs in solving sedimentological problems, and so to further underline the importance of Wireline Sedimentology as a distinct discipline. The principal logs used are Formation MicroScanner (FMS) images, together with dipmeter-microresistivity, gamma ray and geochemical plots, taken during ODP Leg 129 in the Pigafetta and E. Mariana Basins, W. Central Pacific.
Seven resedimented volcaniclastic facies including slumps, debrites, and turbidites are recognised within thick (115-221 m) but poorly recovered (4-68%) Cretaceous and Miocene-Pliocene volcaniclastic units. A combination of wireline logs calibrated or correlated with recovered intervals and with known signatures, can be used to delineate facies in poorly recovered and badly disturbed coring intervals and hence to construct a complete borehole record of FMS image descriptions (FIDs). From these, it is possible to identify macro-, meso- and microsequences (> 100, 10-100 & < 10m thick respectively) of turbidite facies on the basis of bed-thickness trends. Whereas the macro- and mesosequences are a response to allocyclic volcano-tectonic controls, both oscillation and saw-tooth microsequences reflect autocyclic controls, including turbidite compensation effects. A new model for the sedimentary successions developed around volcanic archipelagoes and within mid-ocean basins is presented, taking into account the types of sequence observed and their likely controls.
Since FMS images formed the basis of all interpretations outlined above, a scheme defining the context of FMS image data sequences is proposed, that includes: physical, global, and local contexts. This method of approach can be used in part or in full to document even very fine scale sedimentological features and to interpret their origin (e.g., bed pinch-out direction, based on cross-lamination or bioturbation).
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Published date: 1993
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Local EPrints ID: 462536
URI: http://eprints.soton.ac.uk/id/eprint/462536
PURE UUID: fa6ebdca-b243-4bb4-9835-7049dfa5fcd9
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Date deposited: 04 Jul 2022 19:16
Last modified: 16 Mar 2024 18:57
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Author:
Ali Reza Mohammed Salimullah
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