| 1 | 加拿大萨斯喀彻温省麦克阿瑟河铀矿床的发现显示文摘麦克阿瑟河(McArthur River)P2 North铀矿床位于阿萨巴斯卡盆地东南部,距凯湖铀矿山北东方向70km处。矿化产于阿萨巴斯卡砂岩和经过逆冲的基底石墨变沉积岩中,矿体埋深为500—600m,构造上受座落于石墨质基底岩石上的一个区域性北东向断层控制。在1521Ma的铀矿化事件前后发生了几期热液蚀变,包括硅化、伊利石化、高岭石化、绿泥石化和镁电气石化蚀变。可能与基底石英岩有关的早期硅化作用减少了砂岩的渗透性,并限制了粘土蚀变晕的发育。矿化由晶质铀矿组成,不含其他一些与不整合面有关的铀矿床中常见的钻-镍-砷化物矿物。铀含量大于1×10^(-6)的岩石形成一条通往基岩表面的示踪通道。1980年此地区的矿化砂岩漂砾引起人们注意,在1984—1986年用物探方法固定了区域性电导体,1986年钻探工作在矿床西南4.5km处见到了次经济矿化。在本区继续进行工作确定了与断层崖有关的矿化特征,沿构造部位的进一步钻探,导致1988年下半年发现了P2North矿床。采用了各种物探技术来圈定电导带,并帮助勾画出蚀变分布和基底地质情况,蚀变分布、构造观察和砂岩的岩石地球化学特征也有助于钻孔的布置。沿矿床1700m长大约打了30个直孔,孔距为50—100m,对其进行了验证。1990年底的初步估算表明,矿床储量为90800t,平均品位4%U_3O_8。 | J.Marlatt B.McGill R.Matthews 陈振时 | 1991 | 国外铀金地质1991，，4： | 1 |
| 2 | Self-reported physical functioning,cardiometabolic health conditions, and healthcare utilization patterns in Million Veteran Program enrollees with Traumatic Brain Injury Screening and Evaluation Program data显示文摘Background Examining the health outcomes of veterans who have completed the United States Veterans Health Administration’s(VHA’s)Traumatic Brain Injury(TBI)Screening and Evaluation Program may aid in the refinement and improvement of clinical care initiatives within the VHA.This study compared self-reported physical functioning,cardiometabolic health conditions,and health care utilization patterns in Million Veteran Program enrollees with TBI Screening and Evaluation Program data(collected between 2007 and 2019),with the goal of enhancing understanding of potentially modifiable health conditions in this population.Methods In this observational cohort study,veterans(n=16,452)were grouped based on the diagnostic outcome of the TBI Screening and Evaluation Program:1)negative TBI screen(Screen^(-));2)positive TBI screen but no confirmed TBI diagnosis[Screen^(+)/Comprehensive TBI Evaluation(CTBIE)^(-)];or 3)positive TBI screen and confirmed TBI diagnosis(Screen^(+)/CTBIE^(+)).Chi-square tests and analysis of covariance were used to explore group differences in physical functioning,cardiometabolic health conditions,and health care utilization patterns,and logistic regressions were used to examine predictors of Screen^(+/-)and CTBIE^(+/-)group status.Results The results showed that veterans in the Screen^(+)/CTBIE^(-)and Screen^(+)/CTBIE^(+)groups generally reported poorer levels of physical functioning(P’s<0.001,np2=0.02 to 0.03),higher rates of cardiometabolic health conditions(P’s<0.001,φ=0.14 to 0.52),and increased health care utilization(P’s<0.001,φ=0.14 to>0.5)compared with the Screen-group;however,health outcomes were generally comparable between the Screen^(+)/CTBIE^(-)and Screen^(+)/CTBIE^(+)groups.Follow-up analyses confirmed that while physical functioning,hypertension,stroke,healthcare utilization,and prescription medication use reliably distinguished between the Screen-and Screen^(+)groups(P’s<0.02,OR’s 0.78 to 3.38),only physical functioning distinguished between the Screen^(+)/CTBIE^(-)and Screen^(+)/CTBIE^(+)groups(P<0.001,OR 0.99).Conclusions The findings suggest that veterans who screen positive for TBI,regardless of whether they are ultimately diagnosed with TBI,are at greater risk for negative health outcomes,signifying that these veterans represent a vulnerable group that may benefit from increased clinical care and prevention efforts. | Alexandra L.Clark Makenna B.McGill Erin D.Ozturk David M.Schnyer Catherine Chanfreau‑Cofnier Victoria C.Merritt | 2023 | Military Medical Research2023，10，5： | 0 |
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