146 research outputs found
Depositional history of the Trinity-Tiger Shoals region : a transgressed delta complex of the middle Holocene Mississippi Delta
No full textThe Holocene Mississippi River Delta is arguably the world’s most thoroughly researched deltaic system. However, much of this research has occurred predominantly within the present-day subaerial delta, whereas comparatively little research has been attempted downdip within the offshore, more difficult-to-reach parts. This study advances our understanding of the Holocene delta by examining deltaic sediments within the Trinity-Tiger Shoals Complex region, located ~ 30 – 40 km offshore of central Louisiana. Specifically, this study addresses two questions. Which delta complex prograded into this offshore region? Do the overlying transgressive deposits reflect that predicted by the prevailing transgressive depositional systems model? To answer these questions, this study uses an integrated data set consisting of ~ 1,350 km of high-resolution subbottom sonar profiles and various sedimentological data gleaned from 60 vibracores, including 22 AMS radiocarbon dates. Results from this study depict an intricate stacking arrangement of 12 distinct depositional units. Near the base of the stratigraphic framework above antecedent topography are the remnants of a middle Holocene Mississippi Delta complex. Prodelta and delta-front facies along with the partially-preserved southwest trending distributary system that fed these depositional environments are recognized. Furthermore, analysis of the regressive component reveals an offsetting, overlapping, and stacked arrangement of four delta lobes and one subdelta. Five AMS radiocarbon dates (~ 4,820 yr BP to 5,980 yr BP) measured from these regressive sediments confirm a Maringouin Delta Complex origin. A ~ 4,000 yr hiatus ensued following the abandonment of the Maringouin Delta Complex, as indicated by 17 AMS radiocarbon dates measured from the overlying transgressive component. During this hiatus, erosional shoreface retreat produced a prominent ravinement surface along the entire top boundary of the Maringouin Delta. It was not until ~ 1,000 yr BP that significant amounts of sediments began migrating into the study area from the east, which have remained, at least for the time being, mostly preserved. Among these recent post-Maringouin depositional units are a detached down-drift subaqueous delta related to the Lafourche Delta Complex as well as the most-recent sandy deposits of Trinity Shoal and an unnamed shoal. This new understanding of post-Maringouin deposition is considered incompatible with the prevailing transgressive depositional systems model, particularly stage 3 of that model
Long-term subsidence and compaction rates: a new model for the Michoud area, south Louisiana
No full textThis study examined the stratigraphic record of the Michoud area in East New Orleans, Louisiana to address questions concerning the magnitude of, and processes leading to land-surface subsidence. The hypotheses under review are based on recent geodetic studies, which challenge the widely held position that modern subsidence is primarily a function of shallow sediment compaction. Testing these hypotheses involved constructing a structural cross section of the Michoud area using well logs, chronostratigraphic data, and fault picks, so as to evaluate differential motion along specific faults through time. Employing ages and corrected depths for three key subsurface horizons, long-term (Middle Miocene to Present) time-averaged subsidence rates were calculated: rates range from -0.140 to -0.177 m/kyrs (-0.140 to -0.177 mm/yr). Long-term subsidence rates are incompatible with those derived from geodetic studies: geodetically derived subsidence rates (-14.2 to -23.0 mm/yr) for the Michoud area are two orders of magnitude greater than long-term subsidence rates. Considering the scale of resolution of respective techniques, caution is advised when comparing respective subsidence rates. Nevertheless, the new subsurface, structural model for the Michoud area suggests reactivation of local faults, including any recent movement of the Michoud Fault, is a transient phenomenon that is likely related to rapid Quaternary sediment loading. It is reasonable to compare mean long-term compaction rates, which is a component of total subsidence, derived from this research to geodetically derived compaction rates of pre-Holocene strata. Using a standard decompaction technique, mean long-term compaction rates for strata residing above the Middle Miocene Bigenerina Humblei horizon were calculated: rates range from -0.0704 to -0.0914 m/kyrs (-0.0704 to -0.0914 mm/yr), which are two orders of magnitude less than geodetically derived, pre-Holocene strata compaction rates (-4.6 mm/yr). The findings of this research, particularly the discrepancy between mean long-term compaction rates derived in this study and pre-Holocene compaction rates derived geodetically, raises questions into the interpretations and/or accuracy of the geodetic data for the Michoud area, and therefore, the subsidence rates determined from such data
Dickson and Flora Reeder
No full textDickson and Flora Reeder will play in Jean Anouilh\u27s Episode in the Life of an Author for the Fiesta de Marza of Women of the West in Edrington Scott Theater. They are shown seated on a couch, she is holding a telephone, and Dickson is smoking and holding a book on lap. Fort Worth Star-Telegram Morning edition February 22, 1968.https://mavmatrix.uta.edu/specialcollections_startelegram1960s/4290/thumbnail.jp
23 Things Physical Samples
No full textPhysical samples are a basic element for reference, study, and experimentation in research. The 23 Things for Physical Samples aims to provide a reference overview of resources centered on the management and sharing of data on material samples. The output focuses on existing work, recent developments, recommended practices, and community initiatives. The 23 resources are related to the following categories: 1) a general introduction, 2) persistent identifiers, 3) metadata, 4) citing samples, 5) data licensing and ownership, 6) tools, 7) repositories and 8) communities of practice
The Association Between Ongoing Task Context and Target Action Influences Activity-Based Prospective Memory
No full textabstract: Prospective memory is defined as the process of remembering to do something at a particular point in the future after first forming a conscious intention. There are three types of prospective memory intentions; event-based, time-based and activity-based intentions. Research has suggested that activity-based is one of the dominant prospective memory failures that people self-report yet there is little research on this area of prospective memory. The current study focuses on how activity-based PM is influenced by the association between the match of internal context and intended action. According to previous research, similar context between intention formation and retrieval has been shown to facilitate prospective memory, which increases the execution of intentions. Based on literature, we hypothesized that there would be higher intention completion when the internal context matches the intended action to be completed in the future. Results showed that internal context affected activity-based intention completion significantly. However the interaction between internal context and the intended action did not significantly affect intention completion. Although we did not get the hypothesized interaction, the means do cross over showing the interaction pattern is there. We decided to treat this as a pilot study and replicate it with a well-powered experiment consisting of 560 valid participants
The Christian ministry : case studies of preachers of the Churches of Christ in Bicol, Philippines
No full textThis thesis examines the challenges faced by the ministers of religion in Churches of Christ (Restoration Movement) in Bicol, Philippines. The goal is to do theology from below, not from above, as pastoral ministry must come from the experience of those who practice it, not from textbooks. The pastoral perspectives of the dilemmas that the ministers raise are heard, observed, documented, and then reflected upon. To do this, case studies of four preachers are used and the mga problema that they present are explored with them.
As a result, first, I introduce some of those challenges which are perplexing on the ground level and which appear to be under-researched in serious theological circles, especially in an Asian context. Second, I hope that these case studies can be used to stimulate reflection in ministerial and spiritual formation. Third, I document some of the theology and methodology of the Churches of Christ, particularly as practiced in the Philippines.
Chapter 1 explores the dichotomy between the perceived satisfaction in the pastoral ministry with the crisis of role and identity. In particular, issues such as forced exits and stress are presented while baptism and preaching are scrutinized. Chapter 2 centres on the conundrums experienced in planting a new church and being the lone planter. Chapter 3 examines three challenges–the task of ministering in a home congregation, the issue of accreditation in ministerial training, and how the minister can be a success and grow the church. Never far from the thoughts and actions of any of the Bicolano ministers is the problema of poverty, so Chapter 4 considers some of the Filipino, personal, and spiritual complexities of poverty, delineates a number of factors that need to be taken into consideration in any effort to overcome this malady and concludes with a particular reference to ministry
Lander data Richardson 2019 short deployment
No full textLander data collected druing short deployment RB201
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