bluuebunny/crossref_metadata_2025_split huggingface dataset:
Two late Carboniferous belts of Nb-enriched mafic magmatism in the Eastern Tianshan: Heterogeneous mantle sources and geodynamic implications
Authors: Zhang Yunying , Yuan Chao , Sun Min , Long Xiaoping , Huang Zongying , Jiang Yingde , Li Pengfei , Du Long 
Published: January 2020

AbstractIdentification of subduction to post-collisional tectonic transitions is critical to the study of orogenic belts. To characterize such a transition in the Tianshan Orogenic Belt, a systematic study was conducted on the late Carboniferous (305–301 Ma) Hongshankou dolerite and Dikan’er basalt of Eastern Tianshan. The Hongshankou dolerites have relatively high Ti and Nb contents, akin to Nb-enriched arc basalts. Based on the Nb/La ratios, these dolerites can be divided into low-Nb/La (0.35–0.40) and high-Nb/La (0.67–1.4) groups, which were likely derived respectively from slab melt-metasomatized mantle wedge and a mixed mantle source involving depleted super-slab and enriched sub-slab asthenospheric components. Like the low-Nb/La dolerites, the Dikan’er basalts possess low Nb/La (0.42–0.46) ratios, suggesting a mantle source previously modified by slab components. In addition, the Dikan’er basalts have variable Nb contents and can be grouped into normal arc basalts and Nb-rich basalts that can be attributed to a common mantle source with different degrees of mantle melting, as demonstrated by the positive correlations of La/Sm with La and Nb. By integrating available data, two late Carboniferous belts of Nb-enriched mafic magmatism are recognized in the Eastern Tianshan, with one in the Yamansu arc (336–301 Ma) and the other in the Bogda Mountains (305–301 Ma). The former is characterized by low Nb/La (&lt;0.6) ratios, reflecting derivation from mantle metasomatized by slab-derived melt during a subduction process; the latter exhibits an abrupt Nb/La increase from 0.6 to 1.4, indicating significant input of sub-slab asthenospheric mantle that was probably induced by slab break off. Accordingly, we propose that the tectonic transition from subduction to post-collision in the Eastern Tianshan occurred in the latest Carboniferous (305–301 Ma) and was marked by the abrupt input of deep and enriched asthenospheric mantle.
Neotectonics of the Bailongjiang and Hanan faults: New insights into late Cenozoic deformation along the eastern margin of the Tibetan Plateau
Authors: Li Hailong , Zhang Yueqiao , Dong Shuwen , Zhang Junlong , Sun Yujun , Wang Qiangmao 
Published: January 2020

AbstractThe way that far-field stresses and deformation propagated eastward in response to the growth and extrusion of the northeastern Tibetan Plateau remains a crucial scientific issue. This paper focuses on the Bailongjiang and Hanan faults, which are the easternmost part of the East Kunlun fault in northeast Tibet. Based on new field geological investigations, structural data, satellite imagery interpretation, and optically stimulated luminescence and 14C dating results, this paper presents the structural geometry and neotectonic activities of the two faults. The ∼200-km-long Bailongjiang fault, bounding the Bayan Har block in northeast Tibet, consists of two segments. Along the western segment, late Pleistocene lacustrine-facies deposits and Holocene activities were discovered in a great fault scarp. The left-slip rate of the fault is estimated to be ∼1.73–2.61 mm/yr, with an elapsed time of ∼2205 yr after a catastrophic paleoseismic event greater than M 7.2 ruptured the fault. The eastern segment splits into two branches and shows a positive flower structure where a pull-apart basin developed, filled with ∼200-m-thick mudstone and argillaceous siltstone, which record the mid-late Miocene deformation of the Bailongjiang fault. The Hanan fault features reverse faulting caused by NNW-SSE compression in the late Cenozoic. The two faults, together with the Maqên-Maqu-Tazang fault, confine the area of a strip block, the eastward extrusion of which was accommodated by thrusting due to the resistance of the stable Bikou massif since the late Cenozoic, which led to decreasing slip rates along the easternmost part of the Kunlun fault.
Ecological disturbance in tropical peatlands prior to marine Permian-Triassic mass extinction
Authors: Chu Daoliang , Grasby Stephen E. , Song Haijun , Corso Jacopo Dal , Wang Yao , Mather Tamsin A. , Wu Yuyang , Song Huyue , Shu Wenchao , Tong Jinnan , Wignall Paul B. 
Published: January 2020

AbstractThe Permian-Triassic mass extinction is widely attributed to the global environmental changes caused by the eruption of the Siberian Traps. However, the precise temporal link between marine and terrestrial crises and volcanism is unclear. Here, we report anomalously high mercury (Hg) concentrations in terrestrial strata from southwestern China, synchronous with Hg anomalies in the marine Permian-Triassic type section. The terrestrial sediments also record increased abundance of fossil charcoal coincident with the onset of a negative carbon isotope excursion and the loss of tropical rainforest vegetation, both of which occurred immediately before the peak of Hg concentrations. The organic carbon isotope data show an ∼5‰–6‰ negative excursion in terrestrial organic matter (bulk organic, cuticles, and charcoal), reflecting change in atmospheric CO2 carbon-isotope composition coincident with enhanced wildfire indicated by increased charcoal. Hg spikes provide a correlative tool between terrestrial and marine records along with carbon isotope trends. These data demonstrate that ecological deterioration occurred in tropical peatlands prior to the main marine mass extinction.
Environmental predictors of deep-sea polymetallic nodule occurrence in the global ocean
Authors: Dutkiewicz Adriana , Judge Alexander , Müller R. Dietmar 
Published: January 2020

Abstract
Polymetallic nodules found on the abyssal plains of the oceans represent one of the slowest known geological processes, and are a source of critical and rare metals for frontier technologies. A quantitative assessment of their occurrence worldwide has been hampered by a research focus on the northeastern Pacific Ocean and the lack of a global open-access data set of nodules. We have compiled a global data set of &gt;10,000 seabed nodule and control samples, and combine it with digital grids of key environmental parameters to generate a predictive machine-learning model of nodule occurrence. In order of decreasing parameter ranking, we find that nodules are associated with very low sedimentation rates (&lt; 0.5 cm/k.y.), moderately high oxygen values (150 and 210 mmol/m3), lithologies of clay followed by calcareous ooze, low summer surface productivity (&lt;300 mgC/m2/day), low benthic biomass concentration (&lt;1 log mgC/m2), water depths &gt;4500 m, and low total organic carbon content (0.3–0.5 wt%). Competing hypotheses for nodule sustention and thus continued growth on the seafloor are the removal of sediment by bottom-water currents and biological activity. Using a high-resolution eddy-resolving ocean circulation model, we find that the bottom-current speeds over nodule fields are too low (&lt;5 cm/s) to remove sediment, implicating the activity of epibenthic megafauna as the most likely mechanism. Our global nodule probability map combined with the assessment of a range of environmental drivers provides an improved basis for decision and policy making in the controversial area of deep-sea exploration.
All-cause mortality following low-dose aspirin treatment for patients with high cardiovascular risk in remote Australian Aboriginal communities: an observational study
Authors: Zhao Yuejen , Jeyaraman Kanakamani , Burgess Paul , Connors Christine , Guthridge Steven , Maple-Brown Louise , Falhammar Henrik 
Published: January 2020

ObjectivesTo evaluate the benefit and risk of low-dose acetylsalicylic acid (aspirin) in patients from remote Aboriginal communities in the Northern Territory, Australia.DesignRetrospective cohort study using primary care and hospital data routinely used for healthcare. Aspirin users and non-users were compared before and after controlling confounders by matching. Marginal structural models (MSM) were applied to ascertain the benefit and risk.SettingThe benefit and harm of aspirin were investigated in patients aged ≥18 years from 54 remote Aboriginal communities.ParticipantsNone had a previous cardiovascular event or major bleeds. Patients on anticoagulants or other antiplatelets were excluded.InterventionAspirin at a dose of 75–162 mg/day.Outcome measuresEndpoints were all-cause, cardiovascular mortality and incidences of cardiovascular events and major bleeds.Results8167 predominantly Aboriginal adults were included and followed between July 2009 and June 2017 (aspirin users n=1865, non-users n=6302, mean follow-up 4 years with hospitalisations 6.4 per person). Univariate analysis found material differences in demographics, prevalence of chronic diseases and outcome measures between aspirin users and non-users before matching. After matching, aspirin was significantly associated with reduced all-cause mortality (HR=0.45: 95% CI 0.34 to 0.60; p<0.001), but not bleeding (HR=1.13: 95% CI 0.39 to 3.26; p=0.820). After using MSMs to eliminate the effects of confounders, loss of follow-up and time dependency of treatment, aspirin was associated with reduced all-cause mortality (HR=0.60: 95% CI 0.47 to 0.76; p<0.001), independent of age (HR=1.06; p<0.001), presence of diabetes (HR=1.42; p<0.001), hypertension (HR=1.61; p<0.001) and alcohol abuse (HR=1.81; p<0.001). No association between aspirin and major bleeding was found (HR=1.14: 95% CI 0.48 to 2.73; p=0.765). Sensitivity analysis suggested these findings were unlikely to have been the result of unmeasured confounding.ConclusionAspirin was associated with reduced all-cause mortality. Bleeding risk was less compared with survival benefits. Aspirin should be considered for primary prevention in Aboriginal people with high cardiovascular risk.
Recent trends in seroprevalence of rubella in Korean women of childbearing age: a cross-sectional study
Authors: Choi Rihwa , Oh Yejin , Oh Youngju , Kim Sung Ho , Lee Sang Gon , Lee Eun Hee 
Published: January 2020

ObjectivesThe aim of this study was to investigate the immunity against rubella using the serological status of rubella-specific IgG antibodies (antirubella IgG) in Korean women of childbearing age (15–49 years).DesignRetrospective cross-sectional study.SettingPopulation-based cross-sectional study in South Korea.ParticipantsBetween January 2010 and December 2017, test results from Korean women aged 15–49 years who had visited an obstetric private clinic (nationwide institutions) and had requested rubella-specific IgG antibody tests from Green Cross Laboratories were obtained from the laboratory information system.ResultsBetween 2010 and 2017, antirubella IgG test results from 328 426 Korean women aged 15–49 years who had visited private obstetric clinics (1438 institutions nationwide) were retrospectively analysed by tested year, age, cohort and geographic regions. Over the 8-year study period, the rate of unimmunised women ranged from 7.8% to 9.7%. Multivariable-adjusted logistic regression models showed that the odds of being immune to rubella (positive and equivocal results of antirubella IgG test) were lower in 2017 compared with 2010, in women in their 40s, in a pre-catch-up cohort and in women living in Incheon, Busan, South Gyeongsang, North and South Jeolla and Jeju provinces (p<0.0001).ConclusionsIn consideration of the factors associated with prevalence of women unimmunised to rubella, future public health efforts should be focused on catch-up activities. The results of this study could be used to strengthen disease control and prevent rubella, including a nationwide immunisation programme.
Impact of healthcare access and HIV testing on utilisation of cervical cancer screening among US women at high risk of HIV infection: cross-sectional analysis of 2016 BRFSS data
Authors: Zhang Dongyu , Advani Shailesh , Huchko Megan , Braithwaite Dejana 
Published: January 2020

ObjectivePrevious studies identified several factors associated with cervical cancer screening. However, many of them used samples from the general population and limited studies focused on women with high-risk health behaviours. We aimed to disentangle the association of cervical cancer screening with healthcare access and HIV testing among women at a high risk of HIV infection.DesignNationwide cross-sectional survey in the USA.Setting2016 Behavioral Risk Factor Surveillance System.Participants3448 women with a history of high-risk behaviours associated with HIV infectionExposure and outcomeClinical check-up, having personal healthcare provider, health coverage and HIV testing history were treated as exposures. Appropriate cervical cancer screening, which was defined according to 2016 US Preventive Services Task Force guideline, was treated as the outcome of interest.Data analysisMultivariable logistic regression model was performed to evaluate associations of healthcare access and HIV testing with the uptake of cervical cancer screening; adjusted odds ratio (aOR) and 95% CI were reported. We further investigated if educational attainment modified associations identified in the primary multivariable model.ResultsA total of 2911 (84.4%) high-risk women in our sample underwent cervical cancer screening. In the multivariable model, delayed clinical check-up (≥5 years ago vs within the past year: aOR: 0.19, 95% CI: 0.14 to 0.26), having no health insurance (aOR: 0.60, 95% CI: 0.46 to 0.79) and no history of HIV testing (no testing vs testing within the past year: aOR: 0.46, 95% CI: 0.35 to 0.61) were inversely associated with cervical cancer screening utilisation.ConclusionFactors reflecting healthcare access, specifically clinical check-up and health coverage, as well as history of HIV testing were associated with cervical cancer screening in this population-based study of high-risk women. Targeted interventions are warranted to further increase cervical cancer screening among women at high risk of HIV infection.
Association between birth weight and neurodevelopment at age 1–6 months: results from the Wuhan Healthy Baby Cohort
Authors: Zhang Man , Gazimbi Marufu Martin , Chen Zhong , Zhang Bin , Chen Yanru , Yu Yizhen , Tang Jie 
Published: January 2020

ObjectiveThe association between birth weight and infants’ neurodevelopment is not well understood. We aimed to examine the impact of birth weight on neurodevelopment of infants at age 1–6 months using data from the Wuhan Healthy Baby Cohort (WHBC) study.Setting and participantsThis is a prospective cohort study of 4026 infants from the WHBC study who were born at the Women and Children’s Hospital of Wuhan, China between October 2012 and September 2013 and who had complete healthcare records within 6 months after birth. Participants were categorised into three groups according to their birth weight: low birth weight (LBW; birth weight <2500 g), normal birth weight (2500 g ≤ birth weight <4000 g) and macrosomia (birth weight ≥4000 g).Main outcome measuresThe main outcomes were development quotient (DQ) and clinical diagnosis of neurodevelopmental delay. Both adjusted regression coefficients and ORs were estimated for LBW and macrosomia.ResultsOf the 4026 infants, 166 (4.12%) were of LBW and 237 (5.89%) were with macrosomia. Adjusted regression coefficients of LBW and macrosomia for gross motor DQ were −11.18 (95% CI −11.36 to 10.99) and 0.49 (95% CI 0.36 to 0.63), fine motor DQ −6.57 (95% CI −6.76 to −6.39) and −2.73 (95% CI −2.87 to −2.59), adaptability DQ −4.87 (95% CI −5.05 to −4.68) and −1.19 (95% CI −1.33 to −1.05), language DQ −6.23 (95% CI −6.42 to −6.05) and 0.43 (95% CI 0.29 to 0.57), and social behaviour DQ −6.82 (95% CI −7.01 to −6.64) and 1.10 (95% CI 0.96 to 1.24). Adjusted OR of LBW for clinical diagnosis of ‘neurodevelopmental delay’ in gross motor was 2.43 (95% CI 1.65 to 3.60), fine motor 1.49 (95% CI 1.01 to 2.19) and adaptability 1.56 (95% CI 1.06 to 2.31). LBW has no significant effects on ‘neurodevelopmental delay’ in language and social behaviour, and macrosomia has no significant effects on clinical diagnosis of ‘neurodevelopmental delay’ in all domains.ConclusionBoth LBW and macrosomia are associated with infants’ DQ, and LBW increases the risk of being diagnosed with ‘neurodevelopmental delay’ in gross motor, fine motor and adaptability among infants aged 1–6 months.
The North Texas Concussion Registry (ConTex)
Authors: Cullum C. Munro , Bunt Stephen , Hicks Cason , Didehbani Nyaz , Miller Shane , Vargas Bert , Sabo Tonia , Bell Kathleen , Batjer H Hunt 
Published: January 2020

PurposeThe North Texas Concussion Registry (ConTex) was established in 2015 as a multi-institutional collaboration intended to study risk factors, recovery patterns and clinical outcomes associated with concussion across the lifespan, with a particular emphasis on sport-related concussion.ParticipantsProspective enrolment of individuals who sustained a concussion within the past 6 months who were seen at one of four North Texas ConTex concussion clinics which employ common diagnostic criteria and assessment metrics to evaluate effects of a concussion as well as longitudinal tracking of recovery.Findings to dateThe ConTex database and multidisciplinary oversight team has been established, and over 1700 participants aged 5–88 years have been enrolled. A majority of concussions were sport-related (60%), with a mean age of 17.5 years and similar numbers of males and females. Three-month follow-up compliance has been excellent (86%), with a majority of subjects reporting good recovery by that time. ConTex has provided a rich data source for multiple research projects focused on concussion characteristics, risk factors and outcomes, and led to the development of a statewide youth concussion registry.Future plansConTex data are being analysed to add to the body of knowledge regarding concussion mechanisms, factors related to recovery and improving outcomes for concussion patients. ConTex will serve as a platform for future treatment studies and may serve as a model for other concussion surveillance programmes.
Influence of combined exposure to perceived risk at work and unstable employment on self-rated health: a comparison of two cross-sectional surveys in Europe and Korea
Authors: Cho Seong-Sik , Paek Domyung , Kang Mo-Yeol 
Published: January 2020

ObjectivesThe purpose of this study was to investigate the combined effect of exposure to perceived risk at work and unstable employment on self-rated health in both Korea and the European Union.DesignCross-sectional study.SettingWe conducted the analyses using employees data from the third Korean Working Conditions Survey (KWCS) conducted in 2011 and the fifth European Working Conditions Survey (EWCS) conducted in 2010.ParticipantsEmployees of the third KWCS and the fifth EWCS from 35 European countries were the participants of the study.Primary outcome measuresEmployment status was divided into two categories: stable and unstable employment. Perceived risk regarding safety and health at work were assessed. Primary health outcomes were poor or moderate self-rated health. Exposures and health status were assessed via a questionnaire.ResultsAmong Korean employees, the OR of poor self-rated health was 2.00 (95% CI: 1.80 to 2.22) for those with perceived risk at work, 1.18 (95% CI: 1.09 to 1.28) for those with unstable employment and 3.22 (95% CI: 2.72 to 3.81) for those with both perceived risk at work and unstable employment. Relative excess risk due to interaction (RERI) was 1.03 (95% CI: 0.48 to 1.58). Among European employees, the OR for poor self-rated health was 3.20 (95% CI: 2.93 to 3.49) for those with perceived risk at work, 1.04 (95% CI: 0.97 to 1.13) for those with unstable employment and 3.41 (95% CI: 2.93 to 3.98) for those with both perceived risk at work and unstable employment. The RERI was 0.18 (95% CI: −0.36 to 0.71).ConclusionsAmong Korean employees, a supra-additive interaction between perceived risk at work and unstable employment on poor self-rated health was observed. Conversely, a supra-additive interaction was not observed among European employees.
The effect of leadership on public service motivation: a multiple embedded case study in Morocco
Authors: Belrhiti Zakaria , Van Damme Wim , Belalia Abdelmounim , Marchal Bruno 
Published: January 2020

ObjectivesWe aimed at exploring the underlying mechanisms and contextual conditions by which leadership may influence ‘public service motivation’ of health providers in Moroccan hospitals.DesignWe used the realist evaluation (RE) approach in the following steps: eliciting the initial programme theory, designing the study, carrying out the data collection, doing the data analysis and synthesis. In practice, we adopted a multiple embedded case study design.SettingsWe used purposive sampling to select hospitals representing extreme cases displaying contrasting leadership practices and organisational performance scores using data from the Ministry of Health quality assurance programmes from 2011 to 2016.ParticipantsWe carried out, on average, 17 individual in-depth interviews in 4 hospitals as well as 7 focus group discussions and 8 group discussions with different cadres (administrators, nurses and doctors). We collected relevant documents (eg, performance audit, human resource availability) and carried out observations.ResultsComparing the Intervention-Context-Actor-Mechanism-Outcome configurations across the hospitals allowed us to confirm and refine our following programme theory: “Complex leaders, applying an appropriate mix of transactional, transformational and distributed leadership styles that fit organisational and individuals characteristics [I] can increase public service motivation, organisational commitment and extra role behaviours [O] by increasing perceived supervisor support and perceived organizational support and satisfying staff basic psychological needs [M], if the organisational culture is conducive and in the absence of perceived organisational politics [C]”.ConclusionsIn hospitals, the archetype of complex professional bureaucracies, leaders need to be able to balance between different leadership styles according to the staff’s profile, the nature of tasks and the organisational culture if they want to enhance public service motivation, intrinsic motivation and organisational commitment.