Genesis and geological significance of carbonate in Changdu Basin,Xizang,China:Constraints from geochemistry and C-O isotopes

Research on the origin of carbonates in Changdu Basin holds significant importance for understanding the regional potash formation model.Based on a comprehensive review of previous studies,field geological surveys,and laboratory investigations,this study analyzes the origin and properties of carbonates within the context of regional potash formation.Petrographic studies show that magnesite deposits,with the characteristics of sedimentary origin.The results of elemental geochemical analysis show that the carbonates in this area were formed in the sedimentary environment via evaporation followed by concentration,and the formation of magnesite was possibly caused by the substitution of calcium in the dolomite with magnesium-rich brine.Theδ^(13)C values of carbonats in the study area are between5.9‰and 9.1‰.Theδ^(18)O values of magnesite samples range from-7.3‰to-1.3‰,and theδ^(18)O values of dolomites range from-10.3‰to-8.4‰.All the calculated Z values of oxygen isotopes of carbonates greater than 120.A comprehensive analysis of carbon and oxygen isotopes indicates that the magnesite was formed in a highly concentrated Marine sedimentary environment and does not show any relation with the metasomatism of hydrothermal fluids.The results on the correlation of magnesite with seawater and its sedimentary origin provide key information for explaining the migration direction of brine between the Changdu and Lanping-Simao Basins.The residual metamorphic seawater in the Changdu Basin migrated to the Lanping-Simao Basin,where potash underwent deposition.Whereas,magnesite and dolomite in the early stage of potash formation were left in the Changdu Basin.

A Meta-Analysis of the Prognostic and Clinicopathological Significance of circZFR in Human Gastrointestinal Cancers

Background: Studies of gastrointestinal (GIT) cancers have shown that circZFR could be involved in the development and progression of various GIT cancers. However, small sample sizes limit the clinical significance of these studies. Here, a meta-analysis was conducted to ascertain the actual involvement of circZFR in the development and prognosis of GIT cancers. Methods: PubMed, Embase, Web of Science, and the Cochrane Library were searched up to December 31, 2023. Hazard ratios (HRs) or odds ratios (ORs) with 95% confidence intervals (CIs) were pooled to evaluate the association between circZFR expression and overall survival (OS). Publication bias was measured using the funnel plot and Egger’s test. Results: 10 studies having 659 participants were enrolled for meta-analysis. High circZFR expression was associated with poor OS (HR = 1.4, 95% CI: 1.20, 1.70). High circZFR expression also predicted larger tumor size (OR = 4.38, 95% CI 2.65, 7.25), advanced clinical stage (OR = 5.33, 95% CI 3.10, 9.16), and tendency for distant metastasis (OR = 2.89, 95% CI: 1.62, 5.11), but was not related to age, gender, and histological grade. Conclusions: In summary, high circZFR expression was associated with poor OS, larger tumor size, advanced stage cancer and tendency for distant metastasis. These findings suggested that circZFR could be a prognostic marker for GIT cancers.

Microscopic characteristics and geological significance of pyrite in shales of the Wufeng-Longmaxi formations,southeastern Chongqing,China

Shales of the Wufeng-Longmaxi formations in the basin-margin transition zone of southeastern Chongqing,China are characterized by high organic matter content and a significant presence of pyrite development.By examining numerous scanning electron microscope(SEM)images and considering the crystal and aggregate characteristics of minerals,we identified four types of pyrite in the study area:euhedral crystals,irregular aggregates,framboidal aggregates,and metasomatized organisms.Among these types,framboidal aggregates are the most prevalent.The formation mechanism of framboidal pyrite can be categorized into inorganic and organic origins.As inferred from the pyrite characteristics in the study area,the formation mechanism of the metasomatized organisms aligns with the biologically induced mineralization mode of organic origin,whereas the framboidal aggregates are more associated with the biologically controlled mineralization mode of organic origin.This underscores a close relationship between the pyrite formation and organic matter,which in turn indicates that an organic origin is more consistent with the pyrite characteristics observed in this study area.The pyrite morphology can reflect reactive iron concentration.Euhedral pyrite crystals tend to form under a low reactive iron concentration,whereas the formation of framboidal pyrite requires a high reactive iron concentration.Additionally,the type and grain size of pyrite aggregates can reflect variations in the redox conditions of the depositional environment.Pyrite produces positive effects on reservoir storage space,with intercrystalline organic pores,intercrystalline pores,and mold pores associated with pyrite contributing greatly to the storage spaces.

Analysis of the Significance of Key Points of Patient Interventional Psychological Care and Pain Care

Interventional therapy has become increasingly popular in clinical practice due to advancements in medical technology.However,patients often experience psychological and physiological pressure due to its invasive nature.The management of patient discomfort and tension is crucial to ensure effective treatment.Psychological and pain management are essential components of interventional therapy,as they significantly impact patient recovery and prognosis.This article discussed the importance of interventional psychological and pain care for patients,starting with the development and spread of interventional therapy.The significance of providing high-quality nursing services to patients and improving their quality of life was also discussed.

Petrogenesis and Tectonic Significance of the Xiuwacu Two-Period Magmatism in Geza Arc of Yunnan Province： Constraints from Lithogeochemistry, Zircon U-Pb Geochronology and Hf isotopic Compositions

Objective The Late Cretaceous Xiuwacu ore-bearing porphyry is located in the Geza area of southern Yidun arc, SW China. In this area, the rock mass is mainly composed of three lithofacies： biotite granite porphyry, monzonitic granite and light alkali feldspar granite. As a part of the Yidun arc, the Geza arc has common structure and temporal- spatial evolution with the ~idun arc, which has experienced three stages of oceanic crust subduction, collision orogeny and intracontinent convergence stages. The molybdenite ores in the area are mainly hosted in monzonitic granite-porphyry and structural fracture zone, and the ore bodies are strictly controlled by faults. In recent years, great geological prospecting results have been achieved in Xiuwacu, and the deposit has reached a medium scale. However, there are few researches on the metallogenic porphyry. Based on the previous research, we determined the rock-forming and ore-forming age of the porphyry, and found that there were two stages of magmatism intrusion in Xiuwacu： Indosinian and Yanshanian. We also discussed the geochemical characteristics and source area of the rocks in the area.

The functional significance of dentin sialoprotein-phosphophoryn and dentin sialoprotein

Phosphophoryn (PP) and dentin sialoprotein (DSP) are the most dominant non-collagenous proteins in dentin. PP is an extremely acidic protein that can function as a mineral nucleator for dentin mineralization. DSP was first identified in 1981, yet its functional significance is still controversial. Historically, these two proteins were considered to be independently synthesized and secreted by dental pulp cells into the developing dentin matrix. However, with the identification of the DSP coding sequence in 1994, followed2 years later by the finding that the PP coding sequence was located immediately downstream from the DSP sequence, it became immediately clear that DSP and PP proteins were derived from a single DSP-PP (i.e., dentin sialophosphoprotein, DSPP) transcript.Since DSPP cDNA became available, tremendous progress has been made in studying DSP-PP mRNA distribution and DSP generation from the DSP-PP precursor protein at specific cleavage sites by protease tolloid-related-1 (TLR1) or bone morphogenetic protein 1 (BMP1). The functions of DSP-PP and DSP were investigated via DSP-PP knockout (KO) and DSP knockin in DSP-PP KO mice. In addition, a number of in vitro studies aimed to elucidate DSPP and DSP function in dental pulp cells.

Discovery and Significance of the Wusunshan Early Carboniferous NbEnriched Arc Basalts in the Yining Block,West Tianshan

Nb-enriched arc basalts,an extremely special rock type,were formed in a specific tectonic setting,which have attracted much attention in recent years.Although Nbenriched basalts in the Yining Block were interpreted as arc-affinity basalts,some geologists suggested that they should be Nb-enriched continental basalts and not arcrelated.Recently,the Nb-enriched arc basalts have been first identified from the Dahalajunshan Formation in southern Wusunshan,Yining.

Geochronology, Geochemistry and Tectonic Significance of Dike Swarms in Beishan, Gansu

Study area is located at Beishan,Gansu province.Beishan area located at conjunction site among Tarim plate,Sino-Korean plate and Kazakhstan plate,this special tectonic position has a very complex geological tectonic.

Biological Significance of [^(14)C]Phenol Accumulation in Different Organs of a Murrel, Channa punctatus, and the Common Carp, Cyprinus carpio

Phenol, a ubiquitous component of industrial effluents, is a common pollutant of water resources and a serious threat to fish.The present work demonstrates that a significant amount of phenol is retained by various tissues of the common carp.Cyprinus carpio.and the snake-headed murrel.Channa punclatus.The rate of [^(14)C] phenol accumulation was higher in the carp than in the murrel.It is suggested that retention of phenol in the brain and ovary may seriously afiect the reproductive potential of the fish. 1990 Academic Press.Inc.

Review and Significance of Microbial Carbonate Reservoirs in China

1 Introduction Numerous studies on the Meso-Neoproterozoic life evolution show that the cyanobacteria which thrived and dominated the biological world in the Proterozoic Era is closely related to the genesis of microbial carbonate rocks.Considerable oil and gas resources can be found in microbial carbonate rocks and many related oil and gas

Palaeoceanological significance of Holocene ostracean banks in Tianjin area

On the basis of the study of ostracean banks in Tianjin area, the present study recognized that the ostracean banks at Ninghe County in Tianjin area are well developed along the west coast of the Bohai Sea; they consist of thanato-coenose and taphocoenose from Crassistrea gigars and C. revularis. From the 14C datings it can be known that the banks had formed from early Middle-Holocene and continued up to over 2 ka BP (14C age). The top has different reliefs . Although there is an effect of spatial shift of estuary position, the top is only distributed in the range of-0. 50--2. 50 m(Huanghai elevation minus National elevation system). The banks cannot explain the sea-level fluctuation. As the string ostracean banks are distributed near E-W direction, it suggests that the direction of tidal currents was then similar to that of the present day.

Prognostic significance of annexin VII expression in glioblastomas multiforme in humans

OBJECT:Glioblastoma multiforme(GBM)is the most common and lethal primary brain tumor in adults.It isnearly uniformly fatal,with a median survival time of approximately l year,despite modem treatment modalities.Nevertheless,a range of survival times exists around this median.Efforts to understand why some patients livelonger or shorter than the average may provide insight into the biology of these neoplasms.The annexin VII(ANX7)gene is located on the human chromosome 10q21,a site long hypothesized to harbor tumor

The Significance of Sheeted Dike Complexes in Ophiolites

The modern‘Penrose’definition of ophiolites is based largely on the Troodos complex of Cyprus,which contains a spectacular and well-exposed sheeted dike complex in which dike intrudes dike without intermediate screens of

Pollen Morphology and Ecological Significance of Nine Hygrophyte Species at Sevenstar Lake Area in the Bashang Area of Hebei Province

ObjectiveThis study aimed to investigate the morphological characteristics of pollen from nine hygrophyte species at Sevenstar Lake area in the Bashang Area （the southern edge of Inner Mongolian Plateau） of Hebei Province, as well as their ecological significance. MethodThe pollen morphology of nine hygrophyte species distributed at Seven Star Lake area was observed and studied by using an optical microscope, and morphological characteristics like size, shape, surface ornamentation were recorded. ResultsPollen grains were globose, subglobose prolate spheroidal; germination aperture had five types, namely, 3-groove, 6-groove, 3 （4）-groove, 3-colporate, 3 （4）-colporate; ektexine possessed four kinds of ornamentation： reticulate, striped, spiny, granular. Meanwhile, the environmental indication significance of these nine hygrophyte species was also discussed according to their habitats, origin and distribution. ConclusionThe study provides the basis of modern palynology for the study of ancient environment, ancient vegetation and paleoclimate.

THE SIGNIFICANCE OF TESTING PREOPERATIVE VISUAL FUNCTION IN CATARACT USING LASER INTERFEROMETRIC VISUAL ACUITY AND ERG

Tests of preoperative visual function and prediction of postoperative E chart visual acuity(ECVA) using laser interferometric visual acuity(LIVA) and electroretinogram(ERG) were performed in 16 cases(19 eyes) of cataract. The results showed that the coincident rate between preoperative LIVA and postoperative ECVA was 63.2%, and there was a parallel correlation between preoperative amplitude of photopic ERG b-wave and postoperative ECVA in 79.0% of the eyes. Comparing these two methods, the test of LIVA ...

Development and Significance of Cave Dwelling Resort on the Loess Plateau

Relevant ecotourism theories were applied to further investigate the mushrooming cave dwelling resorts on the Loess Plateau.By introducing the present development of cave dwelling settlements in the study area,types of cave dwelling resort was summarized:historic cave dwelling resort based on high cultural value,artistic value and aesthetic value;cave dwelling resort characterized by primitive folk customs;cave hotel showing folk house features of the Loess Plateau.Luochuan Resort of the Loess Folk Customs,Miaoshang Resort of Sanmenxia,Stone Cave Hotel of Yangjialing in Yan'an were respectively studied to analyze features and development conditions of cave dwelling resort,on the basis of which development principles and countermeasures were discussed.The orientation of cave dwelling resort on the Loess Plateau should be determined first,sustainability and accountability of ecotourism should be followed.Finally,the significance of cave dwelling resort for promoting local economic development,enhancing the rational utilization of natural resources,protecting and developing traditional settlements of cave dwellings was given.

WHAT IS THE SIGNIFICANCE OF THE OLYMPIC FLAME?

万众瞩目的北京奥运会圣火采集仪式在希腊古奥林匹克遗址圆满落下帷幕,并开启了在全球范围内的圣火传递活动。那么奥运圣火采集仪式究竟从何而来;整个仪式"暗藏"了什么玄机;奥运圣火为何要传递五大洲;传递过程中怎样保持其不被熄灭呢?

Geochemical Characteristics and Significance of Basalt in the Hongshiyan Pb-Zn-Cu Polymetallic Deposit in Southeastern Yunnan Province

1 Introduction Southeast Yunnan is the convergent place of the Yangtze,Indochina blocks(Xu Wei,et al.2008).The Hongshiyan Pb-Zn-Cu polymetallic deposit is located in Wenshan Prefecture,Yunnan Province.It is a typical large sized VMS-type deposit discovered in recent years.The major ore minerals are sphalerite,galena,chalcopyrite ect.

Petrogeochemistry, geochronology and its geological significance of the granite from Baishipo Ag deposit, Dabie orogen

1 Introduction Granitoid magmas have been widely used as a natural probe for tracing the crustal evolution process(Martin et al.,2005).Mesozoic granitoids are widespread in the Dabie

Mineral Geochemical Characteristics and Indication Significance of Biotite-Rutile in the Gabbro Intrusions in the Yinmin Iron-Copper District, Yunnan

1 Introduction After the Dongchuan Orogenic movement(Hudsonian Orogeny,ca.1800 Ma±),the tectonic basement layer of the continental crust on the Yangtze massif could have been formed.And then tectonic-magmatic emplacement