scholarly journals Biostratigraphy and sequence stratigraphy of the Toarcian Ludwigskanal section (Franconian Alb, Southern Germany)

Zitteliana ◽  
2021 ◽  
Vol 95 ◽  
pp. 57-94
Author(s):  
Gernot Arp ◽  
Sebastian Gropengießer ◽  
Christian Schulbert ◽  
Dietmar Jung ◽  
Andreas Reimer
Keyword(s):  
Organic Carbon ◽  
Southern Germany ◽  
Sequence Stratigraphic ◽  
Region I ◽  
Relief Formation ◽  
High Carbonate ◽  
System Tracts ◽  
Almost All ◽  
Maximum Flooding Surface ◽  
Reference Section

Extensive construction work at the canal cutting of the Ludwigskanal near Dörlbach, Franconian Alb, provided the opportunity to re-investigate a scientific-historical and biostratigraphically important reference section of the South-German Toarcian. The 16 m thick section, described bed by bed with respect to lithology and macrofossils, starts within the Upper Pliensbachian Amaltheenton Formation, covers the Toarcian Posidonienschiefer and Jurensismergel Formation, and ends in basal parts of the Opalinuston Formation. Carbonate contents are high in the Posidonienschiefer and successively decline within the Jurensismergel to basal parts of the Opalinuston. The high carbonate contents in the Posidonienschiefer are associated with comparatively low organic carbon contents. However, organic carbon contents normalized to the silicate fraction are similarily high if compared to other regions in Germany. Only the persistence of high organic carbon levels into middle parts of the Upper Toarcian differs from those of most regions in central Europe. Ammonite biostratigraphy indicates a thickness of >9 m for the Upper Pliensbachian, 1.15–1.20 m for the Lower Toarcian, 5.04 m for the Upper Toarcian, and >0.5 m for the Lower Aalenian. Despite the low sediment thickness, all Toarcian ammonite zones and almost all subzones are present, except for major parts of the Tenuicostatum Zone and the Fallaciosum Subzone. On the basis of discontinuities, condensed beds, and correlations with neighbouring sections in Southern Germany, a sequence stratigraphic interpretation is proposed for the Toarcian of this region: (i) The Posidonienschiefer Formation corresponds to one 3rd order T-R sequence, from the top of the Hawskerense Subzone to a fucoid bed at the top of the Variabilis Subzone, with a maximum flooding surface at the top of the Falciferum Zone. (ii) The Jurensismergel Formation exhibits two 3rd order T-R sequences: The first ranges from the basis of the Illustris Subzone (i.e., the Intra-Variabilis-Discontinuity) to the top of the Thouarsense Zone, with a maximum flooding surface within the Thouarsense Zone. The “belemnite battlefield” reflects a transgressive “ravinement surface” within the first Jurensismergel Sequence, not a maximum regression surface at its basis. The second sequence extents from the erosive basis of the Dispansum Zone to the top of the Aalensis Subzone, with a maximum flooding surface at the Pseudoradiosa-Aalensis Zone boundary. Finally, the Opalinuston starts with a new sequence at the basis of the Torulosum Subzone. Transgressive system tracts of these 3rd order T-R sequences are commonly phosphoritic, while some regressive system tracts show pyrite preservation of ammonites. The maximum regression surfaces at the basis of the Toarcian and within the Variabilis Zone reflect a significant submarine erosion and relief formation by seawater currents, while this effect is less pronounced at the basis of the Dispansum Zone and basis of the Torulosum Subzone (i.e., the boundary Jurensismergel-Opalinuston Formation).

scholarly journals Sequence Stratigraphy of Well DX, Gongola Sub-Basin, Upper Benue Trough, Nigeria

2019 ◽  
Vol 23 (10) ◽  
pp. 1855-1860
Author(s):  
F.O. Amiewalan ◽  
E.O. Bamigboye
Keyword(s):  
Gamma Ray ◽  
Third Order ◽  
Depositional Sequence ◽  
Benue Trough ◽  
Sequence Stratigraphic ◽  
Surface System ◽  
Sequence Boundaries ◽  
System Tracts ◽  
Maximum Flooding Surface ◽  
Gamma Ray Log

: Biostratigraphic study of Well DX has yielded Cretaceous miospores and dinoflagellates cysts which heightened the recognition of sequence boundaries (SB), Maximum Flooding Surfaces (MFS) and associated Systems Tracts. Five maximum flooding surfaces between 95.6 Ma and 89.0 Ma, four sequence boundaries between 96.4 Ma and 93.0 Ma and threedepositional sequences were identified with varying average thicknesses of sediments interpreted from the gamma ray log and biostratigraphic data. The threedepositional sequences interpreted are -depositional sequence I (96.4 Ma - 95.4 Ma) (8240 ft. - 8120 ft.), depositional sequence II (95.4 Ma - 94.0 Ma) (8120 ft. - 7850 ft.) and depositionalsequence III (94.0 Ma - 93.0 Ma) (7850 ft. - 7550 ft.). All the depositional sequences fall within the third order cycle. The age of the well was attempted based on the presence of some selected marker fossils - Ephedripites spp., Classopollis spp., Spiniferites spp., Cyclonephelium distinctum, Cyclonephelium vannophorum, Subtilisphaera spp., Eucomiidites spp., Triorites africaensis, Odontochitina costata and Droseridites senonicus recovered from the studied intervals and was dated Albian - Santonian. The Sequence stratigraphic interpretations are useful in further deepening the knowledge of thesubsurface geology of the studiedwell in Gongola Sub Basin, Upper Benue Trough of Nigeria.Keywords: Sequence Boundary, Maximum Flooding Surface, System tracts, Depositional sequence

The preservation of total organic carbon of the Silurian Pridoli strata in the Milaičiai-103 well core of Western Lithuania

2015 ◽  
Vol 1 (2) ◽  
Author(s):  
Augustė Gelūnaitė ◽  
Andrej Spiridonov
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Mixed Effect ◽  
Sequence Stratigraphic ◽  
Stratigraphic Model ◽  
Core Section ◽  
Stage System ◽  
The Baltic ◽  
System Tracts ◽  
Mixed Effect Modeling

The Pridoli series is one of the thickest and most complete stratigraphic intervals of the Silurian as well as other systems of the Lithuanian part of the Baltic sedimentary basin. In this study we present a sequence stratigraphic model of the sedimentary succession in the Milaičiai-103 core section. High resolution trend of concentrations of total organic carbon is presented in the developed stratigraphic context. The variability in the total organic matter amount in different sequence stratigraphic system tracts was statistically evaluated using the generalized linear mixed-effect modeling approach. The statistical analysis revealed that the highest concentrations of total organic carbon in the studied section are expected in a highstand and transgressive system tracts and significantly lower concentrations are expected in a lowstand and falling stage system tracts.

scholarly journals Sequence Stratigraphy of the Arab A to C Members and Hith Formation, Offshore Abu Dhabi

GeoArabia ◽  
1998 ◽  
Vol 3 (2) ◽  
pp. 251-268 ◽  
Author(s):  
Samir R. Azer ◽  
Ross G. Peebles
Keyword(s):  
Upper Jurassic ◽  
Abu Dhabi ◽  
Petroleum Reservoir ◽  
Sequence Stratigraphic ◽  
Sea Level Fluctuations ◽  
Layer Cake ◽  
Geochemical Analyses ◽  
System Tracts ◽  
Maximum Flooding Surface ◽  
Fifth Order

ABSTRACT The Upper Jurassic Hith Formation and Arab members A, B and C, in central and western offshore Abu Dhabi, consist of 450 to over 600 feet of massive to interbedded anhydrites with varying proportions of limestones and dolomites. A high resolution sequence stratigraphic framework for this important petroleum reservoir interval was developed from core and well log data, and various inorganic geochemical analyses. This data was acquired from wells located at 3 locations spread over 100 kilometers. Nineteen shallowing-upward parasequences, corresponding to fourth and possibly fifth-order cycles, were recognized for the Arab members as follows: A (7 cycles), B (5 cycles), and C (7 cycles). Five parasequences were recognized for the Hith Anhydrite Formation. The Arab parasequences are arranged in a layer-cake stacking pattern and vary in thickness from 6 to 30 feet. These are interpreted to correspond to transgressive-regressive episodes which are driven by low-amplitude sea-level fluctuations (eustacy). The typical parasequence consists of shoal grainstones, representing transgressive system tracts, that pass upward into thin-bedded lagoonal burrowed mud/wackestones, representing the maximum flooding surface. These are overlain by coarse bioclastic grainstones capped by algal laminites and culminate into supratidal anhydrites, which pinchout eastwards. In the west offshore Abu Dhabi the parasequences are thicker and consist of intertidal pack/grainstones overlain by anhydrites.

Sequence stratigraphy of the late Carboniferous Clifton Formation, New Brunswick

2020 ◽  
Vol 57 (11) ◽  
pp. 1289-1304
Author(s):  
Brandon M. Keough ◽  
Olivia A. King ◽  
Matthew R. Stimson ◽  
Page C. Quinton ◽  
Michael C. Rygel
Keyword(s):  
New Brunswick ◽  
Sediment Supply ◽  
Sequence Stratigraphic ◽  
Marine Strata ◽  
Stratigraphic Framework ◽  
Carbonaceous Shales ◽  
Study Interval ◽  
Maritimes Basin ◽  
Sequence Boundaries ◽  
Maximum Flooding Surface

The Maritimes Basin of Atlantic Canada contains a rich record of Pennsylvanian cyclothems. Previous studies have focused on rapidly subsiding depocenters in the central part of the basin where Carboniferous successions feature cyclic alternations between terrestrial and marginal marine strata. In contrast, the Pennsylvanian Clifton Formation was deposited on the relatively stable New Brunswick platform and contains almost entirely terrestrial strata. Although early studies of the Clifton Formation noted a cyclic architecture, particularly within Member B, this unit has remained understudied. We provide a sedimentological and sequence stratigraphic framework for the lower 85 m of Member B and interpret our results relative to a broader regional framework. Near the base of the study interval, the highstand systems tract is composed of red floodplain mudrocks; overlying sequence boundaries are composed of calcretes and (or) channels. The transgressive systems tract and maximum flooding surface are represented by coals and aquatic bivalve-bearing mudrocks. Moving upward through the section, the architecture of the highstand systems tract remains largely unchanged while sequence-bounding paleosols become less well developed, the transgressive systems tract becomes thinner and eventually not preserved, and the maximum flooding surface is only occasionally preserved, possibly represented by carbonaceous shales. These changes in cyclic architecture may be attributed to changes in the magnitude of glacioeustatic fluctuations, climate, and (or) the accommodation/sediment supply ratio. The results of this study show that the Clifton Formation represents the terrestrial/proximal endmember for cyclicity in the Maritimes Basin and provide new insight into paleotopography as a possible control on cyclothem architecture.

The significance of karst unconformities on overlying resource shales: Lessons learned from the Devonian Woodford Formation applied to the Permian Wolfcamp Shale

2019 ◽  
Vol 7 (4) ◽  
pp. SK33-SK43
Author(s):  
Jing Zhang ◽  
Roger Slatt
Keyword(s):  
Lessons Learned ◽  
Central Basin ◽  
Permian Basin ◽  
Woodford Shale ◽  
Sequence Stratigraphic ◽  
Stratigraphic Model ◽  
Slug Model ◽  
Unconventional Resource ◽  
Maximum Flooding Surface ◽  
Unconformity Surface

We have summarized the threefold significance of karst unconformity boundary: (1) The development of a sequence stratigraphic model for the Devonian Woodford Shale Formation is transferable to the Upper Wolfcamp in the Permian Basin, (2) demonstration of the more general application of that model beyond the Woodford to other resource shales, and (3) illustration of a modification of common sequence stratigraphy models specifically to unconventional resource shales. During early transgression, marine encroachment into the paleolows created anoxic, hypersaline marine “pockets” conducive to the preservation of organic matter. The result is deposition of thick, laterally discontinuous, organic-rich strata stratigraphically at or near the unconformity surface. This pattern of deposition and distribution of the organic-rich shale has been well-documented in the Devonian Woodford Shale and is applicable to other resource shales, in this case to the Permian Upper Wolfcamp Formation in the Central Basin Platform of the Permian Basin. The stratigraphy of the distribution of the Upper Wolfcamp on top of the Upper/Middle Wolfcamp Unconformity is similar to that of the Woodford, suggesting a similar origin and distribution. The resulting stratigraphy in both cases resembles that of the classical Exxon sea slug model except that rather than a single organic-rich deposit defining the condensed section and maximum flooding surface, a second organic-rich deposit occurs stratigraphically lower, at or near the unconformity surface. This theoretical summary can support the discovery of potential drillable target zones in the Woodford Shale and the Wolfcamp Shale.

Study on Sedimentary Characteristics and Models of River Group Sequence

2014 ◽  
Vol 608-609 ◽  
pp. 1141-1146
Author(s):  
Zheng Shi ◽  
Long Wei Qiu ◽  
Yong Qiang Yang
Keyword(s):  
Clear Understanding ◽  
Delta Front ◽  
Sequence Stratigraphic ◽  
Sedimentary Characteristics ◽  
Stratigraphic Framework ◽  
Depositional System ◽  
Sand Body ◽  
System Tracts ◽  
Mud Logging ◽  
Core Description

Zhunzhong area Qingshui River group has top and bottom boundaries,which are not clear,and research on the evolution of the lack in sequence stratigraphic framework of deposition and on the reservoir sand body types do not have a clear understanding problem.In seismic interpretation, core description and based on the analysis of the related test,combining with the mud logging and well logging data,for the redefinition of Qingshui River group on the top and bottom boundaries,it identifies 6 time significance of sequence boundary,taking Qingshui River group can be divided into 2 sequences, 5 system tracts;clear and definite the study area mainly developed delta lacustrine depositional system,which can be further divided into the delta front subfacies, beach bar facies and semi deep lake subfacies. It takes an analysis on the sedimentary characteristics and distribution rules of different types, and it controls effect of topography and hydrodynamic conditions on deposition system, and then puts forward the corresponding sedimentary patterns.

A SEQUENCE STRATIGRAPHIC STUDY OF THE CALLOVIAN FLUVIO-DELTAIC TO MARINE SUCCESSION WITHIN THE ZOCA REGION

1996 ◽  
Vol 36 (1) ◽  
pp. 269 ◽  
Author(s):  
P.A. Arditto
Keyword(s):  
Coastal Plain ◽  
Distribution Patterns ◽  
Zone Boundary ◽  
Third Order ◽  
Sediment Distribution ◽  
Sequence Stratigraphic ◽  
Modern Analogue ◽  
Delta System ◽  
Order Sequence ◽  
Reference Section

This paper presents the results and conclusions of an integrated sequence stratigraphic study of the Callovian marine succession across area 'A' of the Zone of Cooperation (ZOCA). This study utilised wireline log and conventional core data from within ZOCA 91–1 and ZOCA 91–12, and incorporated trade data from adjacent permits, to generate a rational depositional model for the succession. Three distinct third-order sequences have been recognised from the detailed correlation of regional flooding surfaces recognised on wireline log motifs calibrated against conventional core and biostratigraphy. The base of the oldest third-order sequence includes section previously referred to as Plover Formation, and roughly corresponds to the W.digitata/W.indotata zone boundary. The Callovian Unconformity within the ZOCA region is thus relegated to a third-order sequence boundary or disconformity. The term Elang Formation is proposed for this Callovian succession which comprises three third-order sequences mappable across ZOCA. The well-type section for the Elang Formation is Elang-1, and an additional well reference section would be Elang-2, as both these wells contain significant and complementary cored section.Detailed sedimentological studies on conventional core reveal that the Elang Formation comprises a succession of coastal plain to nearshore marine sediments, ranging from low sinuosity fluvial channel, fluvial-dominated deltaic, proximal low sinuosity estuarine channel and distal outer bay sediments. Only minor wave-dominated, open marine shoref ace intervals were interpreted, most of the cored intervals indicating a fluvially-domi-nated shoreline with minimal wave reworking. Isopach and per cent sand maps generated for each third-order sequence comprising the Elang Formation illustrate the successive sediment distribution patterns across ZOCA during the progressive marine transgression from the top of the fluvio-deltaic Plover Formation to the base of the offshore marine Lower Flamingo Group. The sand-trend maps for the three sequences which comprise the Elang Formation indicate a fluvial/estuarine-dominated delta system, sourced from the region of the Laminaria Field, AC/P8, building east and southeast out across the ZOCA region. A modern analogue of this delta system in both size and sedimentation style may be the Brahmaputra/Ganges Delta of East Bengal.

Rights-Based Indicators Validation for Millennium Development Goals Localization in the Selected Municipalities of Ilocos Sur

2014 ◽  
Vol 9 (1) ◽  
Author(s):  
FATIMA F. ROCAMORA
Keyword(s):  
Human Rights ◽  
Millennium Development Goals ◽  
Data Gathering ◽  
Monitoring And Evaluation ◽  
Development Planning ◽  
Development Officers ◽  
Region I ◽  
Development Goals ◽  
Almost All ◽  
Mdg 4

This study dealt with the validation of rights-based indicators for MillenniumDevelopment Goals localization in the municipalities of Narvacan, Sinait, Sta.Catalina, and Bantay in Ilocos Sur. It is in response to the call of institutionalizingrights-based approach for MDG development planning and governance. Itlooked into the indicators’ availability, relevance, measurability, and feasibility andthe extent of availability of data in the LGUs. The respondents were the MunicipalSocial Welfare and Development officers, rural health officers, Municipal Planningand Development coordinators and the Municipal Local Government officers. Indeveloping the data gathering instrument, educators, researchers, statisticians,human rights advocates, stakeholders and the Commission on Human Rightsof Region I were involved. Results show that only a few of the indicators werehighly available; almost all were relevant and had good level of measurability.Only MDG 3 was highly feasible. Most had no sufficient data available exceptfor MDG 2- Achieve Universal Primary Education, MDG 3- Promote GenderEquality, and MDG 4- Reduce Child Mortality. These findings can be used inthe mainstreaming of human rights in the development of plans, projects andprograms especially in the monitoring and evaluation of development.Keywords: Social Science, rights-based indicators, Millennium Development Goals,localization, descriptive design, Philippines

Characteristics of Sedimentation Evolution Based on the Sequence Stratigraphic Frameworks in Shahezi Formation of Southern Xujiweizi Fault Depression

2014 ◽  
Vol 1010-1012 ◽  
pp. 1359-1364
Author(s):  
Ang Li ◽  
Lai Xing Cai ◽  
Shuang Liu ◽  
Qi Li
Keyword(s):  
Sequence Stratigraphy ◽  
Developmental Stages ◽  
Second Grade ◽  
Lake Basin ◽  
Sequence Stratigraphic ◽  
Sedimentary Evolution ◽  
Stratigraphic Framework ◽  
Stratigraphic Division ◽  
Facies Types ◽  
System Tracts

Many scholars in China introduced the theory of sequence stratigraphy,applying to Chinese continental fault depression lake, they have made a lot of achievements in scientific research. However, there are still a lot of controversy according to the establishment in Shahezi group of sequence stratigraphic framework in Xujiaweizi fault depression.Sequence boundary identification method in this paper is based on the “instruction of Vail’s sequence stratigraphy theory, identification of seismic unconformity, verification by using logging methords”. And, following the principle of isochronous ,sequence stratigraphic framework of this region is established clearly. The southern Xujiaweizi fault depression in Shahezi group is divided into 1 second grade sequence, in the interior distributed SQ1-SQ4 4 third grade sequences from the bottom. Developmental stages at the bottom of SQ1 and the top of SQ4, basin is small and water is shallow. However, Developmental stages in SQ2 and SQ3,water enters the lake basin continuously, formed a sedimentary background of “wide basin and deep water”. In addition, each of the three grade sequence has split structure, the lake transgressive domain and lake regression domain two system tracts. Besides, the reversed order para-sequence sets caused by the lake regression and progradation set on the positive para-sequence sets caused by the lake transgression and retrogradation. On the basis of sequence stratigraphic division and correlation, conbined with the regional construction and the supply of provenance ,the sedimentary sequence framework of evolution characteristics are studied.That fan delta,braided river delta, lacustrine are the main facies types in study area. Characteristics of sedimentary evolution there are like this: the characteristics of sedimentation evolution show framework controls sand, succession of evolution, separated-source sedimentary, contiguously distribution.

scholarly journals Soil Nutritional Status of Tea Plantations in Plains of Sub Himalayan West Bengal, India

2020 ◽  
Vol 8 (3) ◽  
pp. 239-246
Author(s):  
Mainak Mukherjee ◽  
Sourav Chakraborty ◽  
Sahadeb Sarkar ◽  
Sumedha Saha ◽  
Soumya Majumder ◽  
...  
Keyword(s):  
Organic Carbon ◽  
West Bengal ◽  
Soil Nutrient ◽  
Nutrient Status ◽  
Crop Productivity ◽  
Soil Samples ◽  
Garden Soil ◽  
High Potassium ◽  
Tea Plantations ◽  
Almost All

Tea is the most consumed beverages after water. In Terai and Dooars region of sub Himalayan West Bengal, India, tea plantations are around 150 years. Exploitation of tea garden soil over centuries has led to decline in soil fertility and crop productivity after all initiatives of external inputs. As nutrients play a crucial role in quality and quantity of manufactured tea, the present initiative has been designed to quantify the soil nutrient status of tea growing Terai and Dooars region. 79.62% (Terai) and 84.72% (Dooars) of the soil samples were found to have normal pH. 47.21% (Terai) and 49.3% (Dooars) of soil samples was found to have normal organic carbon. 12.03% and 20.82% of soil from Terai and Dooars showed low total nitrogen. Both the organic carbon and nitrogen in soil are positively correlated. Phosphorus (as P2O5) content of soil is extremely site and depth specific. Almost all samples of the study area showed high potassium (as K2O) content. Monoculture, change in rainfall pattern and inorganic additives have contributed enormous stress to soil but despite of all these odds the overall nutritional richness of these tea growing regions seems to be satisfactory.

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