Comparison of Sequence Stratigraphic Significance between East Coulee Delta and Jijihu Modern Subaqueous Aggradational Fan(SAF)
Bibliographic record
Abstract
Jijihu modern subaqueous aggradational fan(SAF) in Jungar Basin,Xinjiang Province,China,is 24m arch length and 10m radii.Jijihu SAF consists of alluvial fan 1,unit A(SAF),unit B(slop beds,retrogradational beds and flooding mud-sand beds),unit C(alluvial fan 2) and unit D(alluvial fan 3),which have been documented by Li by observing and digging during one week in the condition of 40 degree centigrade Junggar Basin after desert flood in 2007 summery time. Field observation directs as followings:(1) Exception of alluvial fan 1,Jijihu SAF has the similar stacking patterns with East Coulee Delta(Posamentier et al.,1992).Especially,there is a 1cm red mud bed between alluvial fan 1 and SAF,directing that they belong to continuous sedimentation documented by digging.Although SAF covers alluvial fan 1 in the Northern side of pool,another isochronous unit opposite Jijihu SAF about 10m away in the Southern side directs the lowest alluvial fan clearly.Thereby,alluvial fan 1 becomes the lowest unit that may be interpreted as falling stage systems tract(FSST) during forced regression associated with incision,showing that pond water reaches lowest level.(2) Subsequently,pond level begins to rise,sediments supply exceeds the rate of level rise,and SAF(unit A) develops during normal regression,so that SAF may be interpreted as lowstand systems tract(LST) according to present scenario of sequence stratigraphy.(3) Associated with level rise exceeds sediments supply,unit B develops as follows:Firstly,fine mud-sands begin to accumulate in front of SAF forming slope beds(i.e.,healing phase wedge of Posamentiaer and Allen(1993)).Secondly,coarse sediments such as gravels deposits on the top of SAF,directing retrogression stacking patterns landward.Finely,level reaches to maximum,flooding mud-sand beds begin to precipitate under hot wind in the Junggar Desert.Therefore,three parts(unit B) above may record as transgressive systems tract(TST) during transgression.(4) The second desert flood forms alluvial fan 2(unit C) and 3(unit D) incising one by one,they may be interpreted as falling stage systems tract(FSST) of another sequence during forced regression. This article has compared the sequence stratigraphic significance between East Coulee Delta in Alberta and Jijihu subaqueous aggradational fan(SAF),and concluded as follows:(1) East Coulee Delta develops LST-TST superposition and FSST superposition that belong to two different depositional sequences;(2) Jijihu SAF develops FSST-LST-TST superposition and FSST superpositions that are attributed to two depositional sequences,too;(3) two outcrops has proved that no highstand systems tract develops after maximum flooding surface in modern small-scale pond,it is possible to represent difference between marine and non-marine settings due to transporting energy in non-marine setting not enough to carry sediments into pond.This paper has also discussed some key problems such as sequence boundary that is redefined as remnant maximum flooding surface(RMFS) and its correlative subaerial unconformity(CSU).Furthermore,this paper suggests avoidance of highstand normal regression term.In subsequent thesis authors will suggest that stillstand normal regression replace highstand normal regression.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".